JDBC连接MySQL5.7的方法

数据库  /  管理员 发布于 6年前   149

1.首先准备mysql 和eclipse环境，在环境搭建好之后，从eclipse官网下载jdbc的驱动包，下载地址http://dev.mysql.com/downloads/connector/j/

2.从下载的文件中取出mysql-connector-java-5.1.31-bin.jar，放到工程中，并导入路径

方法：右击工程名->Build Path->Configure Build Path,选择Add External JAR... 找到mysql-connector-java-5.1.31-bin.jar所在的位置，然后将驱动包加载到项目中，

3.写个例子测试一下

package testmysql; import java.sql.*; public class Test {    public static void main(String[] args) {     String driver = "com.mysql.jdbc.Driver";     String URL = "jdbc:mysql://localhost:3306/student";     Connection con = null;     try     {       Class.forName(driver);     }     catch(java.lang.ClassNotFoundException e)     {       System.out.println("Connect Successfull.");       System.out.println("Cant't load Driver");     }     try       {           con=DriverManager.getConnection(URL,"root","root");       System.out.println("Connect Successfull.");     }      catch(Exception e)     {       System.out.println("Connect fail:" + e.getMessage());     }   } } 

连接上数据库之后，可以根据表中的内容进行数据库表的查询，首先表中要有内容，将一些信息输入到表中之后即可使用SQL语言进行查询

import java.sql.*;  public class Main {      public static void main(String[] args) {      String driver = "com.mysql.jdbc.Driver";      String URL = "jdbc:mysql://localhost:3306/xiaolu";      Connection con = null;     ResultSet rs = null;     Statement st = null;     String sql = "select * from student";     try      {        Class.forName(driver);      }      catch(java.lang.ClassNotFoundException e)      {        // System.out.println("Connect Successfull.");        System.out.println("Cant't load Driver");      }      try        {con=DriverManager.getConnection(URL,"root","root");        st=con.createStatement();       rs=st.executeQuery(sql);       if(rs!=null) {         ResultSetMetaData rsmd = rs.getMetaData();         int countcols = rsmd.getColumnCount();         for(int i=1;i<=countcols;i++) {           if(i>1) System.out.print(";");           System.out.print(rsmd.getColumnName(i)+" ");         }         System.out.println("");         while(rs.next()) {           System.out.print(rs.getString("sno")+" ");           System.out.print(rs.getString("sname")+" ");           System.out.print(rs.getString("ssex")+" ");           System.out.print(rs.getString("sage")+" ");           System.out.println(rs.getString("sdept")+" ");         }       }       //System.out.println("Connect Successfull.");        System.out.println("ok");       rs.close();       st.close();       con.close();     }       catch(Exception e)      {        System.out.println("Connect fail:" + e.getMessage());      }    }  } 

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