9月9日

创建数据库

1.右键创建数据库

2.设置表信息

jdbc

Java 数据库连接

1.新建new preject
2.在src 新建new package
3.新建Directory 复制粘贴 mysql-connector-java-5.0.8-bin.jar
4.右键mysql-connector-java-5.0.8-bin.jar 点 add lib

1.加载驱动
2.创建连接
3.写sql
4.得到statement对象，
5.执行sql
6.处理结果集
7.关闭资源

package com.zhongruan;

import java.sql.*;

public class Test {
public static void main(String[] args) throws ClassNotFoundException, SQLException {
//1.加载驱动
Class.forName(“com.mysql.jdbc.Driver”);
//2.创建连接
Connection connection = DriverManager.getConnection(“jdbc:mysql://127.0.0.1:3306/zjgm?characterEncoding=utf-8&user=root&password=root”);
System.out.println(“创建连接成功”);
//3.写sql
String sql=“select * from stu where age=10”;
//4.得到statement对象，
PreparedStatement statement = connection.prepareStatement(sql);
//5.执行sql
ResultSet resultSet = statement.executeQuery();
//6.处理结果集
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.关闭资源
resultSet.close();
statement.close();
connection.close();

}

}