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- 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>
- 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 { } } }