Mybatis中怎么实现注解增删改查操作(mybatis,编程语言)

需要在config.xml中注册Java接口

<mappers><mapperclass="com.mybatis.DAO.PeopleMapper"/></mappers>

要用class=

查

publicinterfacePeopleMapper{@Select("select*frompeople")List<People>getPeopleList();}

增 可以先开启事务自动提交

publicstaticSqlSessiongetSqlSession(){returnsqlSessionFactory.openSession(true);}}Mapper.java```javapublicinterfacePeopleMapper{@Select("select*frompeople")List<People>getPeopleList();@Insert("insertintopeople(id,name,age,address)VALUES(#{id},#{name},#{age},#{address})")intaddPeople(Peoplepeople);}

test

publicclassPeopleDAOtest{[@Test](https://my.oschina.net/azibug)publicvoidprint(){SqlSessionsqlSession=MybatisUtils.getSqlSession();PeopleMapperpeopleMapper=sqlSession.getMapper(PeopleMapper.class);List<People>people=peopleMapper.getPeopleList();for(Peoplep:people){System.out.println(p);}sqlSession.close();}[@Test](https://my.oschina.net/azibug)publicvoidadd(){SqlSessionsqlSession=MybatisUtils.getSqlSession();PeopleMapperpeopleMapper=sqlSession.getMapper(PeopleMapper.class);peopleMapper.addPeople(newPeople(6,"圣迭戈",456,"啥地方"));print();}}

因为已经自动提交了，所以不需要sqlSession.commit();

删

注解@Param 只能用于基本数据类型 传入的参数只能和sql语句中参数一样 多个参数 样例

publicinterfacePeopleMapper{@Delete("deletepeoplefrompeoplewhereid=#{uid}")intdelPeople(@Param("uid")inti);}

test

publicclassPeopleDAOtest{@Testpublicvoiddel(){SqlSessionsqlSession=MybatisUtils.getSqlSession();PeopleMapperpeopleMapper=sqlSession.getMapper(PeopleMapper.class);peopleMapper.delPeople(6);print();}}

改

Mapper.java

publicinterfacePeopleMapper{@Update("updatemybatis.peoplesetname=#{name},age=#{age},address=#{address}whereid=#{id}")intupdateP(Peoplepeople);}

test

publicclassPeopleDAOtest{@Testpublicvoidupdate(){SqlSessionsqlSession=MybatisUtils.getSqlSession();PeopleMapperpeopleMapper=sqlSession.getMapper(PeopleMapper.class);peopleMapper.updateP(newPeople(5,"圣迭戈",456,"啥地方"));print();}}