mybatis-plus今天遇到一個問題，就是mybatis 沒有讀取到mapper.xml 文件。
特此記錄一下，問題如下：
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org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.husy.mapper.SystemUserMapper.findUserByName 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) |
錯誤代碼如下：
mapper.xml 目錄
代碼如下：
單元測試
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@Testpublic void findUser(){ SystemUser systemUser= systemUserService.findUserByName("admin"); System.out.println(systemUser.toString());} |
mybatis-puls 配置
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@EnableTransactionManagement@Configuration@MapperScan("com.husy.mapper")public class MybatisConfig { /** * mybatis-plus 分頁插件 */ @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); }} |
service實現
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@Servicepublic class SystemUserServiceImpl implements SystemUserService { @Autowired private SystemUserMapper userMapper; @Override public SystemUser findUserByName(String name) { return userMapper.findUserByName(name); }} |
mapper 接口
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@Componentpublic interface SystemUserMapper { SystemUser findUserByName(@Param("userAccount") String name);} |
mapper.xml
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<?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> |
通過上面的代碼可以看出。mapper接口中的方法和映射文件中的方法名稱是一樣的。不存在名稱錯誤導致的情況，返回值，參數類型等你都正確。如果找不到方法，那一定是映射文件配置問題，只有沒有讀取到，才會出現找不到的情況。
我的配置如下：
問題出錯的關鍵位置
我這里引用的是 mybatis-plus-boot-starte 依賴
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<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.0</version> </dependency> |
mapper.xml 的文件引用路徑配置如下：
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mybatis.mapper-locations=classpath:mapper/*.xml |
這就導致，mybatis 讀取不到 mapper映射文件。
經過查閱：
- 如果引用mybatis-plus-boot-starter 依賴，需要配置 mybatis-plus.mapper-locations
- 如果引用mybatis-plus 依賴，需要配置 mybatis.mapper-locations
如下：
引用 mybatis-plus 包
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<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus</artifactId> <version>3.1.0</version></dependency> |
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mybatis.mapper-locations=classpath:mapper/*.xml |
引用 mybatis-plus-boot-starter 包
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<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.0</version> </dependency> |
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mybatis-plus.mapper-locations=classpath:mapper/*.xml |
只要選用其中一種方式，就沒有問題了。
今天看到評論區有小伙伴說沒有作用，這里給了一份Demo ，有問題的小伙伴可以比對一下。
POM
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<?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
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# DataSource Configspring.datasource.url=jdbc:mysql://localhost:3306/db_husy?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=GMT%2B8&zeroDateTimeBehavior=CONVERT_TO_NULLspring.datasource.username=rootspring.datasource.password=123456spring.datasource.driver-class-name=com.mysql.cj.jdbc.Drivermybatis-plus.mapper-locations=classpath:/mapper/*.xml |
MybatisConfig
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@EnableTransactionManagement@Configuration@MapperScan("com.example.demo.mapper")public class MybatisConfig { /**mybatis-plus 分頁插件*/ @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); }} |
其他文件基本沒變化。附上目錄
單元測試
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@SpringBootTestclass DemoApplicationTests { @Autowired SystemUserService systemUserService; @Test public void findUser(){ SystemUser systemUser= systemUserService.findUserByName("admin"); System.out.println(systemUser.toString()); }} |
到此這篇關于詳解mybatis-plus的 mapper.xml 路徑配置的坑的文章就介紹到這了,更多相關mybatis-plus mapper.xml路徑配置內容請搜索服務器之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持服務器之家！
原文鏈接：https://blog.csdn.net/u013234928/article/details/94060733
