Mapped Statements collection does not contain value for
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:### Error querying database.Cause: java.lang.IllegalArgumentException: Mapped Statement
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org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.example.demo.dao.impl.DepartmentDaoImpl.getById
### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.example.demo.dao.impl.DepartmentDaoImpl.getById
产生这种错误的原因一般有二点:
1.是mapper.xml文件的namespace没有与实现接口相对应。
2.在接口的实现方法中没有正确填写对应xml文件的namespace。
3.还有一个原因是 spring没有扫描到mapper.xml。这一般与mybatis的 mapper-locations 配置相关。
(1)如果pom.xml使用的是: mybatis-spring-boot-starter 则yml文件中应该配置 mybatis:mapper-locations: classpath:mapper/*.xml
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.1</version>
</dependency>
(2)如果如果pom.xml使用的是:mybatis-plus-boot-starter 则yml中应该配置 mybatis-plus:mapper-locations: classpath:mapper/*.xml
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1</version>
</dependency>
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