1.創(chuàng)建DBuitl和test3的java class文件

2.用昨天test的代碼稍做修改
package com.zhongruan;

import java.awt.dnd.DragGestureEvent;
import java.sql.*;

public class test {
public static void main(String[] args) throws ClassCastException, SQLException, ClassNotFoundException {
//1.加載驅(qū)動
DButil dButil=new DButil();
Connection connection =dButil.getConnection();
//Class.forName(“com.mysql.jdbc.Driver”);
//2.創(chuàng)建連接
System.out.println(“創(chuàng)建連接成功”);
//3.寫sql
String sql=“select * from stu”;//顯示表所有數(shù)據(jù)


//String sql=“INSERT INTO stu VALUES (88,‘bubu’,88888)”;//增加數(shù)據(jù)
!](https://img-blog.csdnimg.cn/20190910160500103.png)
//String sql=“delect from stu”;刪除數(shù)據(jù)表
//String sql=“UPDATE stu SET name=‘moo’ WHERE id=‘1’”;更改表數(shù)據(jù)
//4.得到statement對象
PreparedStatement statement = connection.prepareStatement(sql);
//5.執(zhí)行sql
ResultSet resultSet =statement.executeQuery();
//statement.executeUpdate();
//6.處理結(jié)果集
while (resultSet.next()){
int id=resultSet.getInt(1);
String name=resultSet.getString(2);
int age =resultSet.getInt(3);
System.out.println(id+name+age);
}
//7.關(guān)閉資源
resultSet.close();
statement.close();
connection.close();
}
}

3.在DButil中輸入代碼

package com.zhongruan;
import java.sql.*;
import java.util.ResourceBundle;

public class DButil {
public static Connection getConnection() throws ClassNotFoundException,SQLException{
Class.forName(“com.mysql.jdbc.Driver”);
Connection connection= DriverManager.getConnection(“jdbc:mysql://localhost/zjgm?user=root&password=123456&characterEncoding=utf-8&useSSL=true”);
return connection;
}//新建DButil類
public static void closeAll(ResultSet resultSet, Statement statement, Connection connection) throws SQLException{
if(resultSet==null){
resultSet.close();
}//新建DButil類
statement.close();
connection.close();;
}
}


4.test3調(diào)用后查詢、刪除等
package com.zhongruan;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class test3 {
public static void main(String[] args) throws SQLException, ClassNotFoundException {
Connection connection=DButil.getConnection();
String sql=“insert into stu(name,agee) values (‘omo’,678)”;添加

PreparedStatement statement=connection.prepareStatement(sql);statement.executeUpdate();DButil.closeAll(null, statement, connection); }

}

5.運行后這樣表示成功

總結(jié)

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