MySql连接数据库简单示例

package com.itheima;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCtest {

    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        try {
            //加载驱动器，创建对象
            Class.forName("com.mysql.jdbc.Driver");
            //创建连接
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mysqldata","root","root");
            //创建Statement对象，用于执行sql语句
            stmt = conn.createStatement();
            stmt.executeUpdate("insert into person(id,name,age,tel) values(2,'搞搞',23,'13333111333')");
            //将执行结果存入ResultSet中
            rs = stmt.executeQuery("select * from person where 1=1");
            //对ResultSet结果集进行遍历
            while(rs.next()){
                String id = rs.getString("id");
                System.out.println(id);
            }
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            //分别关闭所有对象，按照后用到先关闭，最后赋值null以确保
            try {
                if(rs!=null){
                    rs.close();
                    rs = null;
                }
                if(stmt!=null){
                    stmt.close();
                    stmt = null;
                }
                if(conn!=null){
                    conn.close();
                    conn = null;
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

}