mysql——jdbc驱动下载&连接mysql例子

mysql-connector-java-5.1.46.zip【解压后里面jar文件就是所需要的】

https://dev.mysql.com/get/Downloads/Connector-J/mysql-connector-java-5.1.46.zip

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jdbc连接例子

有时候还是不行，然后尝试把mysql的驱动复制到Tomcat的lib文件夹里面就可以了

代码

package com.test;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;

public class Test1 {

    public static void main(String[] args) throws Exception {
        //1、加载驱动
        Class.forName("com.mysql.jdbc.Driver");
        //2、连接mysql的指定数据库
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/liwei", "root", "123456");
        //3、通过数据库的连接操作数据库，实现增删改查
        Statement cs = con.createStatement();
        //4、实现sql，然后返回查询结果
        ResultSet rs = cs.executeQuery("select * from user");
        //处理返回结果，
        while(rs.next()) {
            System.out.println(rs.getString(1));
            System.out.println(rs.getString(2));
            System.out.println(rs.getString(3));
        }
        //关闭资源连接
        rs.close();
        cs.close();
        con.close();
    }

}

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 用配置文件来加载

package com.test;

import java.io.FileInputStream;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Properties;

public class Test1 {

    public static void main(String[] args) throws Exception {
        Properties pt = new Properties();
        FileInputStream fis = new FileInputStream("dbinfo.properties");
        pt.load(fis);
        String driver = pt.getProperty("driver");
        String uri = pt.getProperty("uri");
        String userName = pt.getProperty("userName");
        String password = pt.getProperty("password");
        //1、加载驱动
        Class.forName(driver);
        //2、连接mysql的指定数据库
        Connection con = DriverManager.getConnection(uri, userName, password);
        //3、通过数据库的连接操作数据库，实现增删改查
        Statement cs = con.createStatement();
        //4、实现sql，然后返回查询结果
        ResultSet rs = cs.executeQuery("select * from user");
        //处理返回结果，
        while(rs.next()) {
            System.out.println(rs.getString(1));
            System.out.println(rs.getString(2));
            System.out.println(rs.getString(3));
        }
        //关闭资源连接
        fis.close();
        rs.close();
        cs.close();
        con.close();
    }

}

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