数据库基础5

 

基本连接语句

法1 maven

教程 https://www.bilibili.com/video/BV1pw41147jm

导jar包 https://blog.csdn.net/qq_40893824/article/details/129118784

import java.sql.*;

public class test {

    public static void main(String[] args) throws SQLException {
        //用户信息和url
        String url = "jdbc:mysql://localhost:3306/test";
        String username = "root"; //数据库用户名
        String password = "123456";//数据库密码

        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;
        try {
            //获取数据库连接
            connection = DriverManager.getConnection(url, username, password);//操作数据库
            statement = connection.createStatement();//获取操作数据库的对象
            String sql = "select * from EMP";
            resultSet = statement.executeQuery(sql);//执行sql，获取结果集

            while (resultSet.next()) {//遍历结果集，取出数据
                String name = resultSet.getString("name");
                String sex = resultSet.getString("sex");
                String age = resultSet.getString("age");//输出数据
                System.out.print("姓名:" + name);
                System.out.print("性别:" + sex);
                System.out.print("年龄" + age);

                System.out.println();
            }
            
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            resultSet.close();
            statement.close();
            connection.close();
        }
    }
}

<dependency>
    <groupId>com.mysqlgroupId>
    <artifactId>mysql-connector-jartifactId>
    <scope>runtimescope>
dependency>

 

法2 导入jar

project structure – modules – add jar

导jar包 https://blog.csdn.net/qq_40893824/article/details/129118784

下载 mysql jar包 https://dev.mysql.com/downloads/connector/j/?os=26

 

lib – jar

lib的位置可以在任何地方

 

project structure – libraries – add jar – add to modules