java – MyBatis – Mapped Statements集合已包含值
发布时间：2020-12-15 04:47:52 所属栏目：Java 来源：网络整理
导读：在我的服务器启动时注册mapper类时,我抛出了以下错误消息, [artifact:mvn] 2016-05-07 11:39:21,708 [ERROR] org.mybatis.spring.mapper.MapperFactoryBean - Error while adding the mapper 'interface com.sample.mappers.UserMapper' to configuration.[a
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在我的服务器启动时注册mapper类时,我抛出了以下错误消息,
[artifact:mvn] 2016-05-07 11:39:21,708 [ERROR] org.mybatis.spring.mapper.MapperFactoryBean - Error while adding the mapper 'interface com.sample.mappers.UserMapper' to configuration. [artifact:mvn] java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.sample.mappers.UserMapper.getAllUsers [artifact:mvn] at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:802) [artifact:mvn] at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:774) [artifact:mvn] at org.apache.ibatis.session.Configuration.addMappedStatement(Configuration.java:598) [artifact:mvn] at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:300) [artifact:mvn] at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parseStatement(MapperAnnotationBuilder.java:313) [artifact:mvn] at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:128) [artifact:mvn] at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:72) [artifact:mvn] at org.apache.ibatis.session.Configuration.addMapper(Configuration.java:671) [artifact:mvn] at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:81) [artifact:mvn] at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44) 我为我的mapper接口使用了注释,并且没有xml配置. 下面是我的UserMapper界面, public interface UserMapper {
@Select("SELECT * FROM customer")
List<User> getAllUsers();
@Select("SELECT * FROM customer where userId = #{userId} ")
List<User> getAllUsers(Long userId);
}
解决方法
我找到了错误消息的原因.如果您具有相同的方法名称,则mybatis会抛出Mapped Statements集合已包含值错误消息.因此解决方案是为不同的映射器语句设置不同的方法名称,即使方法签名不同也是如此.
所以在我的mapper接口中,方法名称第二个getAllUsers()名称应该是getUserById();.如果在任何mapper.xml文件中具有相同的方法名称,则会引发相同的错误.因此,必须为mybatis的不同sql语句提供唯一的方法名称或映射器命名空间,以便在运行时映射它. （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |