微软官方SqlHelper类 数据库辅助操作类 原创

数据库  /  管理员 发布于 5年前   606

数据库操作类真的没有必要自己去写，因为成熟的类库真的非常完善了，拿来直接用就好，省时省力。

本文就为大家介绍微软官方的程序PetShop4.0中的SqlHelper类，先来做一下简单的介绍，PetShop是一个范例，微软用它来展示.Net企业系统开发的能力。

那SqlHelper中封装了哪些方法呢？

里面的函数一堆，常用的就那几个，无非就是增删改查嘛，来看下几种常用的函数：

1.ExecuteNonQuery 执行增删改
2.ExecuteReader 执行查询
3.ExecuteScalar 返回首行首列

使用方法介绍

Web.config配置

<connectionStrings><add name="ConnectionString" connectionString="server=127.0.0.1;uid=sa;pwd=ok;database=PetShop;Max Pool Size =512; Min Pool Size=0; Connection Lifetime = 300;packet size=1000;" providerName="System.Data.SqlClient" /></connectionStrings>

调用函数的写法

sql = "UPDATE Student set Name = @Name WHERE Id = @Id";SqlHelper.ExecuteNonQuery(CommandType.Text, sql, new SqlParameter[]{ new SqlParameter("@Name", name), new SqlParameter("@Id", id)});

这样调用就比较简化，而且比较灵活

源码呈上

/// <summary>  /// The SqlHelper class is intended to encapsulate high performance,   /// scalable best practices for common uses of SqlClient.  /// </summary>  public abstract class SqlHelper  {    //数据库连接字符串    public static readonly string ConnectionString = ConfigurationManager.ConnectionStrings["SQLConnString"].ConnectionString;    #region 私有函数和方法    /// <summary>    /// This method is used to attach array of SqlParameters to a SqlCommand.    ///     /// This method will assign a value of DbNull to any parameter with a direction of    /// InputOutput and a value of null.     ///     /// This behavior will prevent default values from being used, but    /// this will be the less common case than an intended pure output parameter (derived as InputOutput)    /// where the user provided no input value.    /// </summary>    /// <param name="command">The command to which the parameters will be added</param>    /// <param name="commandParameters">An array of SqlParameters to be added to command</param>    private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)    {      if (command == null) throw new ArgumentNullException("command");      if (commandParameters != null)      {        foreach (SqlParameter p in commandParameters)        {          if (p != null)          {            // Check for derived output value with no value assigned            if ((p.Direction == ParameterDirection.InputOutput ||              p.Direction == ParameterDirection.Input) &&              (p.Value == null))            {              p.Value = DBNull.Value;            }            command.Parameters.Add(p);          }        }      }    }    /// <summary>    /// This method assigns dataRow column values to an array of SqlParameters    /// </summary>    /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>    /// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>    private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)    {      if ((commandParameters == null) || (dataRow == null))      {        // Do nothing if we get no data        return;      }      int i = 0;      // Set the parameters values      foreach (SqlParameter commandParameter in commandParameters)      {        // Check the parameter name        if (commandParameter.ParameterName == null ||          commandParameter.ParameterName.Length <= 1)          throw new Exception(            string.Format(              "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",              i, commandParameter.ParameterName));        if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)          commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];        i++;      }    }    /// <summary>    /// This method assigns an array of values to an array of SqlParameters    /// </summary>    /// <param name="commandParameters">Array of SqlParameters to be assigned values</param>    /// <param name="parameterValues">Array of objects holding the values to be assigned</param>    private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)    {      if ((commandParameters == null) || (parameterValues == null))      {        // Do nothing if we get no data        return;      }      // We must have the same number of values as we pave parameters to put them in      if (commandParameters.Length != parameterValues.Length)      {        throw new ArgumentException("Parameter count does not match Parameter Value count.");      }      // Iterate through the SqlParameters, assigning the values from the corresponding position in the       // value array      for (int i = 0, j = commandParameters.Length; i < j; i++)      {        // If the current array value derives from IDbDataParameter, then assign its Value property        if (parameterValues[i] is IDbDataParameter)        {          IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];          if (paramInstance.Value == null)          {            commandParameters[i].Value = DBNull.Value;          }          else          {            commandParameters[i].Value = paramInstance.Value;          }        }        else if (parameterValues[i] == null)        {          commandParameters[i].Value = DBNull.Value;        }        else        {          commandParameters[i].Value = parameterValues[i];        }      }    }    /// <summary>    /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters     /// to the provided command    /// </summary>    /// <param name="command">The SqlCommand to be prepared</param>    /// <param name="connection">A valid SqlConnection, on which to execute this command</param>    /// <param name="transaction">A valid SqlTransaction, or 'null'</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>    /// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>    private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)    {      if (command == null) throw new ArgumentNullException("command");      if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");      // If the provided connection is not open, we will open it      if (connection.State != ConnectionState.Open)      {        mustCloseConnection = true;        connection.Open();      }      else      {        mustCloseConnection = false;      }      // Associate the connection with the command      command.Connection = connection;      // Set the command text (stored procedure name or SQL statement)      command.CommandText = commandText;      // If we were provided a transaction, assign it      if (transaction != null)      {        if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");        command.Transaction = transaction;      }      // Set the command type      command.CommandType = commandType;      // Attach the command parameters if they are provided      if (commandParameters != null)      {        AttachParameters(command, commandParameters);      }      return;    }    #endregion private utility methods & constructors    #region ExecuteNonQuery    public static int ExecuteNonQuery(CommandType cmdType, string cmdText)    {      return ExecuteNonQuery(ConnectionString, cmdType, cmdText);    }    public static int ExecuteNonQuery(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)    {      return ExecuteNonQuery(ConnectionString, cmdType, cmdText, commandParameters);    }    /// <summary>    /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in     /// the connection string    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string     /// using the provided parameters    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();        // Call the overload that takes a connection in place of the connection string        return ExecuteNonQuery(connection, commandType, commandText, commandParameters);      }    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored prcedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);      // Finally, execute the command      int retval = cmd.ExecuteNonQuery();      // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();      if (mustCloseConnection)        connection.Close();      return retval;    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);      // Finally, execute the command      int retval = cmd.ExecuteNonQuery();      // Detach the SqlParameters from the command object, so they can be used again      cmd.Parameters.Clear();      return retval;    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified     /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An int representing the number of rows affected by the command</returns>    public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion ExecuteNonQuery    #region ExecuteDataset    public static DataSet ExecuteDataset(CommandType commandType, string commandText)    {      return ExecuteDataset(ConnectionString, commandType, commandText);    }    public static DataSet ExecuteDataset(CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      return ExecuteDataset(ConnectionString, commandType, commandText, commandParameters);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();        // Call the overload that takes a connection in place of the connection string        return ExecuteDataset(connection, commandType, commandText, commandParameters);      }    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connection == null) throw new ArgumentNullException("connection");      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection);      // Create the DataAdapter & DataSet      using (SqlDataAdapter da = new SqlDataAdapter(cmd))      {        DataSet ds = new DataSet();        // Fill the DataSet using default values for DataTable names, etc        da.Fill(ds);        // Detach the SqlParameters from the command object, so they can be used again        cmd.Parameters.Clear();        if (mustCloseConnection)          connection.Close();        // Return the dataset        return ds;      }    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteDataset(connection, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      bool mustCloseConnection = false;      PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);      // Create the DataAdapter & DataSet      using (SqlDataAdapter da = new SqlDataAdapter(cmd))      {        DataSet ds = new DataSet();        // Fill the DataSet using default values for DataTable names, etc        da.Fill(ds);        // Detach the SqlParameters from the command object, so they can be used again        cmd.Parameters.Clear();        // Return the dataset        return ds;      }    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified     /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A dataset containing the resultset generated by the command</returns>    public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion ExecuteDataset    #region ExecuteReader    /// <summary>    /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that    /// we can set the appropriate CommandBehavior when calling ExecuteReader()    /// </summary>    private enum SqlConnectionOwnership    {      /// <summary>Connection is owned and managed by SqlHelper</summary>      Internal,      /// <summary>Connection is owned and managed by the caller</summary>      External    }    public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText)    {      return ExecuteReader(ConnectionString, cmdType, cmdText);    }    public static SqlDataReader ExecuteReader(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)    {      return ExecuteReader(ConnectionString, cmdType, cmdText, commandParameters);    }    /// <summary>    /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.    /// </summary>    /// <remarks>    /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.    ///     /// If the caller provided the connection, we want to leave it to them to manage.    /// </remarks>    /// <param name="connection">A valid SqlConnection, on which to execute this command</param>    /// <param name="transaction">A valid SqlTransaction, or 'null'</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>    /// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>    /// <returns>SqlDataReader containing the results of the command</returns>    private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)    {      if (connection == null) throw new ArgumentNullException("connection");      bool mustCloseConnection = false;      // Create a command and prepare it for execution      SqlCommand cmd = new SqlCommand();      try      {        PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);        // Create a reader        SqlDataReader dataReader;        // Call ExecuteReader with the appropriate CommandBehavior        if (connectionOwnership == SqlConnectionOwnership.External)        {          dataReader = cmd.ExecuteReader();        }        else        {          dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);        }        // Detach the SqlParameters from the command object, so they can be used again.        // HACK: There is a problem here, the output parameter values are fletched         // when the reader is closed, so if the parameters are detached from the command        // then the SqlReader cant set its values.         // When this happen, the parameters cant be used again in other command.        bool canClear = true;        foreach (SqlParameter commandParameter in cmd.Parameters)        {          if (commandParameter.Direction != ParameterDirection.Input)            canClear = false;        }        if (canClear)        {          cmd.Parameters.Clear();        }        return dataReader;      }      catch      {        if (mustCloseConnection)          connection.Close();        throw;      }    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      SqlConnection connection = null;      try      {        connection = new SqlConnection(connectionString);        connection.Open();        // Call the private overload that takes an internally owned connection in place of the connection string        return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);      }      catch      {        // If we fail to return the SqlDatReader, we need to close the connection ourselves        if (connection != null) connection.Close();        throw;      }    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);        AssignParameterValues(commandParameters, parameterValues);        return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      // Pass through the call to the private overload using a null transaction value and an externally owned connection      return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection     /// using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)    {      if (connection == null) throw new ArgumentNullException("connection");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);        AssignParameterValues(commandParameters, parameterValues);        return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteReader(connection, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.     /// </summary>    /// <remarks>    /// e.g.:     /// SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction    /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      // Pass through to private overload, indicating that the connection is owned by the caller      return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified    /// SqlTransaction using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);    /// </remarks>    /// <param name="transaction">A valid SqlTransaction</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>A SqlDataReader containing the resultset generated by the command</returns>    public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)    {      if (transaction == null) throw new ArgumentNullException("transaction");      if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);        AssignParameterValues(commandParameters, parameterValues);        return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteReader(transaction, CommandType.StoredProcedure, spName);      }    }    #endregion ExecuteReader    #region ExecuteScalar    public static object ExecuteScalar(CommandType cmdType, string cmdText)    {      return ExecuteScalar(ConnectionString, cmdType, cmdText);    }    public static object ExecuteScalar(CommandType cmdType, string cmdText, params SqlParameter[] commandParameters)    {      return ExecuteScalar(ConnectionString, cmdType, cmdText, commandParameters);    }    /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in     /// the connection string.     /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);    }    /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string     /// using the provided parameters.    /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <param name="commandParameters">An array of SqlParamters used to execute the command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      // Create & open a SqlConnection, and dispose of it after we are done      using (SqlConnection connection = new SqlConnection(connectionString))      {        connection.Open();        // Call the overload that takes a connection in place of the connection string        return ExecuteScalar(connection, commandType, commandText, commandParameters);      }    }    /// <summary>    /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in     /// the connection string using the provided parameter values. This method will query the database to discover the parameters for the     /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.    /// </summary>    /// <remarks>    /// This method provides no access to output parameters or the stored procedure's return value parameter.    ///     /// e.g.:     /// int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);    /// </remarks>    /// <param name="connectionString">A valid connection string for a SqlConnection</param>    /// <param name="spName">The name of the stored procedure</param>    /// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)    {      if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");      if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");      // If we receive parameter values, we need to figure out where they go      if ((parameterValues != null) && (parameterValues.Length > 0))      {        // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)        SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);        // Assign the provided values to these parameters based on parameter order        AssignParameterValues(commandParameters, parameterValues);        // Call the overload that takes an array of SqlParameters        return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);      }      else      {        // Otherwise we can just call the SP without params        return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);      }    }    /// <summary>    /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection.     /// </summary>    /// <remarks>    /// e.g.:     /// int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");    /// </remarks>    /// <param name="connection">A valid SqlConnection</param>    /// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>    /// <param name="commandText">The stored procedure name or T-SQL command</param>    /// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>    public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)    {      // Pass through the call providing null for the set of SqlParameters      return ExecuteScala