JAVA 使用JDBC连接Mysql数据库 (基础)

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1. 添加 maven 依赖

      <!--JDBC 数据库连接-->
      <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.40</version>
      </dependency>
   

2. 编写java代码连接并查询数据

   import org.junit.Test;
   import java.sql.*;
   
   /**
     * Created by chengh on 2018/12/1.
     * 使用 JDBC连接数据库
     */
   public class JDBCCTest {
     @Test
     public void test(){
        String driver = "com.mysql.jdbc.Driver"; //驱动
        String url = "jdbc:mysql://localhost:3306/数据库名称"; 
        String userName = "root"; //mysql账号
        String password = "123456"; //密码
   
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;
        try {
            //加载驱动程序
            Class.forName(driver);
   
            //连接数据库
            connection = DriverManager.getConnection(url, userName, password);
   
            statement = connection.createStatement();
   
            //结果集（通过查询语句查询后返回）
            resultSet = statement.executeQuery("SELECT * FROM student");
   
            while (resultSet.next()){
                System.out.println(resultSet.getInt("id"));
                System.out.println(resultSet.getString("name"));
            }
        } catch (ClassNotFoundException e) {
            System.out.println("加载驱动异常");
            e.printStackTrace();
        } catch (SQLException e) {
            System.out.println("数据库链接异常");
            e.printStackTrace();
        }finally {
   
        }
     }
   }