junit查询mysql数据库的数据

import org.junit.Test;

import java.sql.*;

public class JUnitMySQLTest {
    
    @Test
    public void testQueryDataFromMySQL() {
        // MySQL数据库连接信息
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";
        
        // 定义SQL查询语句
        String sql = "SELECT * FROM mytable";
        
        // 声明数据库连接和结果集对象
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
        
        try {
            // 连接到MySQL数据库
            conn = DriverManager.getConnection(url, username, password);
            
            // 创建Statement对象
            stmt = conn.createStatement();
            
            // 执行查询语句
            rs = stmt.executeQuery(sql);
            
            // 遍历结果集并处理查询结果
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getString("name");
                // 其他字段类似获取
                
                // 输出查询结果
                System.out.println("id: " + id + ", name: " + name);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            // 关闭数据库连接和相关资源
            try {
                if (rs != null) rs.close();
                if (stmt != null) stmt.close();
                if (conn != null) conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
}