mybatis的Mapper類不能重載方法

Mapper類重載方法，方法名同樣，會拋出異常。

1.xml文件方式
xml文件中存在id相同的兩個元素，拋出異常：

Caused by: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for ***
    at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:872) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:844) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.session.Configuration.addMappedStatement(Configuration.java:668) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:302) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.xml.XMLStatementBuilder.parseStatementNode(XMLStatementBuilder.java:109) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:135) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.buildStatementFromContext(XMLMapperBuilder.java:128) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.xml.XMLMapperBuilder.configurationElement(XMLMapperBuilder.java:118) ~[mybatis-3.4.6.jar:3.4.6]
    ... 128 common frames omitted

2.註解方式
使用註解方式也會拋出異常：

Caused by: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for ***
    at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:872) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.session.Configuration$StrictMap.put(Configuration.java:844) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.session.Configuration.addMappedStatement(Configuration.java:668) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.MapperBuilderAssistant.addMappedStatement(MapperBuilderAssistant.java:302) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parseStatement(MapperAnnotationBuilder.java:351) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.builder.annotation.MapperAnnotationBuilder.parse(MapperAnnotationBuilder.java:134) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.binding.MapperRegistry.addMapper(MapperRegistry.java:72) ~[mybatis-3.4.6.jar:3.4.6]
    at org.apache.ibatis.session.Configuration.addMapper(Configuration.java:741) ~[mybatis-3.4.6.jar:3.4.6]
    at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:80) ~[mybatis-spring-1.3.2.jar:1.3.2]
    ... 45 common frames omitted

Mapper類中不要有相同的方法名（重載）。