笔记心得mybatis的通用dao和service基类

}

通用的daobase

packagecd.sjp.pack.ssm.dao.impl;

importjava.lang.reflect.ParameterizedType;importjava.lang.reflect.Type;

importjava.util.List;

importorg.apache.ibatis.session.SqlSessionFactory;importorg.mybatis.spring.support.SqlSessionDaoSupport;

importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Repository;

importcd.sjp.pack.ssm.dao.IbaseDao;importcd.sjp.pack.ssm..Employee;@Repository

publicclassBaseDaoImpl<T>extendsSqlSessionDaoSupportimplementsIbaseDao<T>{

@Autowired

publicvoidsetSqlSessionFactory(SqlSessionFactorysqlSessionFactory){super.setSqlSessionFactory(sqlSessionFactory);

}

publicvoidsave(Class<T>entityClass,Tt){getSqlSession().insert(entityClass.getName()+"Mapper.add",t);

}

publicvoidupdate(Class<T>entityClass,Tt){getSqlSession().update(entityClass.getName()+"Mapper.update",t);

}

publicvoiddelete(Class<T>entityClass,Longid){getSqlSession().delete(entityClass.getName()+"Mapper.delete",id);

publicTget(Class<T>entityClass,Longid)throwsException{

TselectOne=getSqlSession().selectOne(entityClass.getName()+"Mapper.get",id);

returnselectOne;

}

publicList<T>getAll(Class<T>entityClass){

List<T>selectList=getSqlSession().selectList(entityClass.getName()+"Mapper.getAll");

returnselectList;

}

publicTfindEmp(Class<T>entityClass,Tt){

TselectOne=getSqlSession().selectOne(entityClass.getName()+"Mapper.findOne",t);

returnselectOne;

}

}

通用的servicebase

packagecd.sjp.pack.ssm.service.impl;

importjava.lang.reflect.ParameterizedType;importjava.lang.reflect.Type;

importjava.util.List;

importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Service;

importcd.sjp.pack.ssm.dao.IbaseDao;importcd.sjp.pack.ssm.service.IbaseService;

publicclassBaseServiceImpl<T>implementsIbaseService<T>{@Autowired

}

protectedIbaseDaobaseDao;

Class<T>entityClass;@SuppressWarnings("unchecked")BaseServiceImpl(){

//或者调用的这个对象的类

Classclazz=getClass();

//获得这个对象的父类！！类型typeTypetype=clazz.getGenericSuperclass();

//ParameterizedType代表有参数的类，如BaseServiceImpl<Employee>

//判断type是否实际属于ParameterizedType，若是则强转if(typeinstanceofParameterizedType){

ParameterizedTypeparam=(ParameterizedType)type;

//通过getActualTypeArguments这个方法来获得这个泛型的数组

entityClass= (Class<T>)param.getActualTypeArguments()[0];

}

System.out.println(entityClass);

}

publicvoidsave(Tt){baseDao.save(entityClass,t);

}

publicvoidupdate(Tt){

baseDao.update(entityClass,t);

}

publicvoiddelete(Longid){

baseDao.delete(entityClass,id);

}

publicTget(Longid)throwsException{

//TODOAuto-generatedmethodstubre