JDBC概念: 使用JAVA代码操作数据库
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DEMO:
package com.company.jdbc;
import java.sql.*;
public class Main {
// 数据库地址
static Stringurl ="jdbc:mysql://localhost:3306/mysql";
static Stringusername ="root";
static Stringpassword ="12345678";
public static void main(String[] args) {
// 1.加载驱动(开发推荐的方式)
System.out.println("Hello,Java~~~");
Connection connection =null;
ResultSet resultSet =null;
PreparedStatement preparedStatement =null;
try {
// 2.获取Connection对象 Collection是数据库编程中最重要的一个对象，客户端与数据库所有交互都是通过connection对象完成的
connection = DriverManager.getConnection(url,username,password);
// SQL语句
String sql ="select * from student where name = '张三'";
// 数据库查询方法,执行SQL语句
preparedStatement = connection.prepareStatement(sql);
// 将查询到的结果赋值到ResultSet对象
resultSet = preparedStatement.executeQuery(sql);
// 遍历结果
while (resultSet.next()) {
String name = resultSet.getString("name");
System.out.println("name:" + name);
}
}catch (SQLException throwables) {
throwables.printStackTrace();
}finally {
// 释放资源
if (resultSet !=null) {
try {
resultSet.close();
}catch (SQLException throwables) {
throwables.printStackTrace();
}
}
if (preparedStatement !=null) {
try {
preparedStatement.close();
}catch (SQLException throwables) {
throwables.printStackTrace();
}
}
}
}
}