在 MyBatis 中,你可以通过编写单元测试来测试重载方法。以下是一个简单的示例,展示了如何在 MyBatis 中测试重载方法:
UserMapper.xml
的映射文件,其中包含两个重载的 SQL 查询方法:<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.mapper.UserMapper">
<select id="findUserById" parameterType="int" resultType="User">
SELECT * FROM users WHERE id = #{id}
</select>
<select id="findUserByName" parameterType="String" resultType="User">
SELECT * FROM users WHERE name = #{name}
</select>
</mapper>
UserMapper.java
的接口,用于定义这两个重载方法:package com.example.mapper;
import com.example.model.User;
public interface UserMapper {
User findUserById(int id);
User findUserByName(String name);
}
UserMapperTest.java
的测试类,使用 JUnit 编写单元测试:package com.example.mapper;
import com.example.model.User;
import org.junit.jupiter.api.Test;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.Reader;
import static org.junit.jupiter.api.Assertions.assertEquals;
public class UserMapperTest {
@Test
public void testFindUserById() throws Exception {
// 读取 MyBatis 配置文件
Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
// 构建 SqlSessionFactory
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
// 获取 SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
// 获取 UserMapper 接口的代理对象
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
// 调用重载方法 findUserById
User user = userMapper.findUserById(1);
// 断言结果
assertEquals("John Doe", user.getName());
} finally {
// 关闭 SqlSession
sqlSession.close();
}
}
@Test
public void testFindUserByName() throws Exception {
// 读取 MyBatis 配置文件
Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
// 构建 SqlSessionFactory
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
// 获取 SqlSession
SqlSession sqlSession = sqlSessionFactory.openSession();
try {
// 获取 UserMapper 接口的代理对象
UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
// 调用重载方法 findUserByName
User user = userMapper.findUserByName("John Doe");
// 断言结果
assertEquals(1, user.getId());
} finally {
// 关闭 SqlSession
sqlSession.close();
}
}
}
pom.xml
文件中添加以下依赖:<dependencies>
<!-- ... -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.7.0</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>5.7.0</version>
<scope>test</scope>
</dependency>
</dependencies>
现在,你可以运行 UserMapperTest
类中的测试方法,验证 MyBatis 是否正确地调用了重载方法。