详解mybatis-plus配置找不到Mapper接口路径的坑
作者：闭着眼睛写BUG
mybatis-plus今天遇到一个问题，就是mybatis 没有读取到mapper.xml 文件。
特此记录一下，问题如下：
at com.baomidou.mybatisplus.core.override.MybatisMapperMethod$SqlCommand.<init>(MybatisMapperMethod.java:242)
at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.<init>(MybatisMapperMethod.java:54)
at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.lambda$cachedMapperMethod$0(MybatisMapperProxy.java:65)
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.cachedMapperMethod(MybatisMapperProxy.java:65)
at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:60)
at com.sun.proxy.$Proxy72.findUserByName(Unknown Source)
at com.husy.service.impl.SystemUserServiceImpl.findUserByName(SystemUserServiceImpl.java:23)org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.husy.mapper.SystemUserMapper.findUserByName
错误代码如下：
mapper.xml 目录
代码如下：
单元测试
@Test
public void findUser(){
SystemUser systemUser= systemUserService.findUserByName("admin");
System.out.println(systemUser.toString());
}
mybatis-puls 配置
@EnableTransactionManagement
@Configuration
@MapperScan("com.husy.mapper")
public class MybatisConfig {
/**
* mybatis-plus 分页插件
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
return new PaginationInterceptor();
}
}
service实现
@Service
public class SystemUserServiceImpl implements SystemUserService {
@Autowired
private SystemUserMapper userMapper;
@Override
public SystemUser findUserByName(String name) {
return userMapper.findUserByName(name);
}
}
mapper 接口
@Component
public interface SystemUserMapper {
SystemUser findUserByName(@Param("userAccount") String name);
}
mapper.xml
<?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.husy.mapper.SystemUserMapper">
<resultMap id="systemUserMap" type="com.husy.domain.SystemUser" >
<id column="user_id" property="userId" />
<result column="user_account" property="userAccount" />
<result column="user_password" property="userPassword" />
<result column="user_phone" property="userPhone" />
</resultMap>
<select id="findUserByName" resultMap="systemUserMap">
SELECT
user_id,
user_account,
user_password,
user_phone
FROM t_system_user
where user_account = #{userAccount}
</select>
</mapper>
通过上面的代码可以看出。mapper接口中的方法和映射文件中的方法名称是一样的。不存在名称错误导致的情况，返回值，参数类型等你都正确。如果找不到方法，那一定是映射文件配置问题，只有没有读取到，才会出现找不到的情况。
我的配置如下：
问题出错的关键位置
我这里引用的是 mybatis-plus-boot-starte 依赖
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.0</version> </dependency>
mapper.xml 的文件引用路径配置如下：
mybatis.mapper-locations=classpath:mapper/*.xml
这就导致，mybatis 读取不到 mapper映射文件。
经过查阅：
- 如果引用mybatis-plus-boot-starter 依赖，需要配置 mybatis-plus.mapper-locations
- 如果引用mybatis-plus 依赖，需要配置 mybatis.mapper-locations
如下：
引用 mybatis-plus 包
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus</artifactId> <version>3.1.0</version> </dependency>
mybatis.mapper-locations=classpath:mapper/*.xml
引用 mybatis-plus-boot-starter 包
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.0</version> </dependency>
mybatis-plus.mapper-locations=classpath:mapper/*.xml
只要选用其中一种方式，就没有问题了。
今天看到评论区有小伙伴说没有作用，这里给了一份Demo ，有问题的小伙伴可以比对一下。
POM
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.0</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
application.properties
# DataSource Config spring.datasource.url=jdbc:mysql://localhost:3306/db_husy?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8&zeroDateTimeBehavior=CONVERT_TO_NULL spring.datasource.username=root spring.datasource.password=123456 spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver mybatis-plus.mapper-locations=classpath:/mapper/*.xml
MybatisConfig
@EnableTransactionManagement
@Configuration
@MapperScan("com.example.demo.mapper")
public class MybatisConfig {
/**mybatis-plus 分页插件*/
@Bean
public PaginationInterceptor paginationInterceptor() {
return new PaginationInterceptor();
}
}
其他文件基本没变化。附上目录
单元测试
@SpringBootTest
class DemoApplicationTests {
@Autowired
SystemUserService systemUserService;
@Test
public void findUser(){
SystemUser systemUser= systemUserService.findUserByName("admin");
System.out.println(systemUser.toString());
}
}
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