[转]MySQL的简单使用和JDBC示例

MySql简单操作

//启动mysql
net start mysql

//登陆
mysql -u root -p

//创建建数据库
create database mydb;
create database test;

//删除数据库
drop database test;

//使用数据库
use mydb;

//创建表
create table mytable（name varchar（20），sex char）;

//显示数据库中所有表
show tables;

//增加一列
alter table mytable add age int;

//插入
insert mytable value（"liu",'f',22）;
insert mytable value（"wang",'m',22）;
insert mytable(name,sex) value("li",'f');
insert mytable value（"zhao",'m',22）;

//删除表中项
delete from mytable where name=”liu“;
delete from mytable where name=”li“;

//更新
update mytable set age = 23 where name = "wang";

//查询
select * from mytable;

JDBC

• JDBC驱动程序分为4类
  • JDBC-ODBC桥
  • 部分本地API，部分Java驱动程序
  • JDBC网络纯Java驱动程序
  • 本地协议Java驱动程序

JDBC的示例

import java.sql.*;
import com.mysql.jdbc.Driver;
public class JDBCMySql {

    public void operateMySql() throws SQLException, ClassNotFoundException{

        String driverName ="com.mysql.jdbc.Driver";
        String URL = "jdbc:mysql://127.0.0.1:3306/mydb";
        String sql = "SELECT * FROM mydb.mytable";
        String username = "root";
        String password = "";
        Connection conn = null;
        try{

        //加载驱动
        Driver.class.forName(driverName);

        //建立连接
        conn = DriverManager.getConnection(URL,username,password);

        //创建statement来执行sql语句
        Statement ps =  conn.createStatement();

        //结果集处理
        ResultSet rs = ps.executeQuery(sql);
        while(rs.next()) {
        System.out.println(rs.getString("name")+","+rs.getString("sex")+","+rs.getInt("age"));
            }
        }
        catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        catch(SQLException e){
            e.printStackTrace();
        }

        //关闭连接
        finally{
            if(conn!=null){
                try{
                    conn.close();
                }catch(SQLException e){
                    e.printStackTrace();
                }
            }
        }
    }
}

建立一个test case来验证一下

import static org.junit.Assert.*;

import java.sql.SQLException;

import org.junit.Before;
import org.junit.Test;

public class JDBCTest {

    @Test
    public void test() throws ClassNotFoundException, SQLException {
        JDBCMySql jm = new JDBCMySql();
        jm.operateMySql();
    }

}

执行结果

转自：http://www.cnblogs.com/sweiqi/p/5936914.html；