mybaits之dao层通用写法sqlsessiontemplate
1.编写dao接口
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public
interface DAO {
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/**
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* 保存对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object save(String str, Object obj) throws Exception;
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/**
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* 修改对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object update(String str, Object obj) throws Exception;
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/**
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* 删除对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object delete(String str, Object obj) throws Exception;
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/**
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* 查找对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object findForObject(String str, Object obj) throws Exception;
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/**
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* 查找对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object findForList(String str, Object obj) throws Exception;
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/**
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* 查找对象封装成Map
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* @param s
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object findForMap(String sql, Object obj, String key , String value) throws Exception;
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}
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public
class DaoSupport implements DAO {
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@Resource(name =
"sqlSessionTemplate")
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private SqlSessionTemplate sqlSessionTemplate;
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/**
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* 保存对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object save(String str, Object obj) throws Exception {
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return sqlSessionTemplate.insert(str, obj);
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}
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/**
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* 批量更新
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object batchSave(String str, List objs )throws Exception{
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return sqlSessionTemplate.insert(str, objs);
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}
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/**
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* 修改对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object update(String str, Object obj) throws Exception {
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return sqlSessionTemplate.update(str, obj);
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}
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/**
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* 批量更新
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public void batchUpdate(String str, List objs )throws Exception{
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SqlSessionFactory sqlSessionFactory = sqlSessionTemplate.getSqlSessionFactory();
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//批量执行器
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SqlSession sqlSession = sqlSessionFactory.openSession(ExecutorType.BATCH,
false);
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try{
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if(objs!=
null){
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for(
int i=
0,size=objs.size();i
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sqlSession.update(str, objs.get(i));
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}
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sqlSession.flushStatements();
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sqlSession.commit();
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sqlSession.clearCache();
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}
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}
finally{
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sqlSession.close();
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}
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}
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/**
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* 批量更新
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object batchDelete(String str, List objs )throws Exception{
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return sqlSessionTemplate.delete(str, objs);
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}
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/**
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* 删除对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object delete(String str, Object obj) throws Exception {
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return sqlSessionTemplate.delete(str, obj);
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}
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/**
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* 查找对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object findForObject(String str, Object obj) throws Exception {
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return sqlSessionTemplate.selectOne(str, obj);
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}
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/**
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* 查找对象
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* @param str
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* @param obj
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* @return
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* @throws Exception
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*/
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public Object findForList(String str, Object obj) throws Exception {
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return sqlSessionTemplate.selectList(str, obj);
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}
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public Object findForMap(String str, Object obj, String key, String value) throws Exception {
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return sqlSessionTemplate.selectMap(str, obj, key);
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}
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}
3.那么怎么使用呢？
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public
class UserService {
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@Resource(name =
"daoSupport")
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private DaoSupport dao;
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/*
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*通过id获取数据
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*/
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public User getUserAndRoleById(String userid) throws Exception {
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return (User) dao.findForObject(
"UserMapper.getUserAndRoleById", "font-family: Arial, Helvetica, sans-serif;">userid);
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}
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}
4. UserMapper.xml中的配置
ROLE_ID,
ROLE_NAME,
RIGHTS,
PARENT_ID,
ADD_QX,
DEL_QX,
EDIT_QX,
CHA_QX
#{ROLE_ID},
#{ROLE_NAME},
#{RIGHTS},
#{PARENT_ID},
#{ADD_QX},
#{DEL_QX},
#{EDIT_QX},
#{CHA_QX}
SYS_ROLE
insert into
update
delete from
update
update
update
update
update
update
好了，就这样，是不是觉得很简单，直接释放出dao层，一个通用dao.