1.删除
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
public class TestDelete {
public static void main(String[] args){
Connection connection=null;
PreparedStatement preparedStatement=null;
DBUtil dbUtil=null;
//1.加载驱动
try {
dbUtil=new DBUtil();
connection=dbUtil.getConnection();
//3.写sql
String sql="delete student where id=?";
//4.获得startment对象
preparedStatement=connection.prepareStatement(sql);
preparedStatement.setInt(1,2);
preparedStatement.executeUpdate();
}catch (Exception e){
e.printStackTrace();
}finally {
dbUtil.closeAll(null,preparedStatement,connection);
//5.得到结果集
}
//6.处理结果集
//7.关闭资源
}
}
2.DBUtil
import java.sql.*;
public class DBUtil {
public static Connection getConnection(){
Connection connection=null;
//1.加载驱动
try {
Class.forName("com.mysql.jdbc.Driver");
//2.创建连接
connection = DriverManager.getConnection
("jdbc:mysql://127.0.0.1:3306/ningda?useSSL=true&characterEncoding=utf-8&user=root&password=root");
System.out.println("创建连接成功");
} catch (Exception e) {
e.printStackTrace();
}
return connection;
}
public static void closeAll(ResultSet rs, PreparedStatement preparedStatement,Connection connection){
if(rs!=null){
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (preparedStatement!=null){
try {
preparedStatement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (connection!=null){
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}