• parameterType 和 resultType

parameterType：单个参数用String，多个参数用map

resultType：可以是 Integer、String、Object

   <select id="countGroupMasterByUid" parameterType="String" resultType="Integer">SELECT COUNT(id)FROM t_mc_store_group_masterWHERE u_id = #{uid}</select><select id="countGroupMaster" parameterType="hashmap" resultType="Integer">SELECT COUNT(1)FROM t_mc_store_group_master gm,t_mc_store_group gWHERE gm.id = g.master_idAND gm.u_id = #{uid}AND g.id = #{groupId}</select><select id="queryMasterIdByUid" parameterType="String" resultType="String">SELECT id FROM t_mc_store_group_master WHERE u_id = #{uid}</select><select id="queryMasterByGroupId" parameterType="String" resultType="com.xxx.smart.group.model.GetGroupMember">SELECT gm.u_id mid,gm.u_name mName,1 mTag,1 pb_list,1 pb_view,1 pb_down,1 pb_upload,1 pb_delete,1 pb_rename,1 pb_share,2 isAdmin,1 isMasterFROM t_mc_store_group g,t_mc_store_group_master gmWHERE gm.id = g.master_idAND   g.id = #{groupId}</select>

• 对应的Java实现接口解析

我们可以基于org.mybatis.spring.SqlSessionTemplate提供的模板类来进行数据库操作的具体实现，例如以下是经过对模板的再封装进行实现的，封装类的过程做了日志记录操作等，在此具体不在细说：

        @Overridepublic int countGroupMasterByUid(String uid) {return getSqlSessionTemplate().selectOne("countGroupMasterByUid", uid);}@Overridepublic int countGroupMaster(String uid, String groupId) {Map<String,String> map = new HashMap<String,String>();map.put("uid", uid);map.put("groupId", groupId);return getSqlSessionTemplate().selectOne("countGroupMaster", map);}@Overridepublic GetGroupMember queryMasterByGroupId(String groupId) {return getSqlSessionTemplate().selectOne("queryMasterByGroupId", groupId);}@Overridepublic String queryMasterIdByUid(String uid) {return getSqlSessionTemplate().selectOne("queryMasterIdByUid", uid);}@Overridepublic List<GroupMaster> queryMasterList(int index, int pageSize) {Map<String,Object> map = new HashMap<String,Object>();map.put("index", (index-1)*pageSize);map.put("pageSize", pageSize);return getSqlSessionTemplate().selectList("queryMasterList",map);}

亦可以参考：http://lydia-fly.iteye.com/blog/2153102

• 动态SQL参考：http://www.cnblogs.com/ywqbj/p/5707652.html

• selectKey的使用

表结构如下：

MySQL [mcloud]> desc t_mc_store_group_master;

+-------------+--------------+------+-----+-------------------+-----------------------------+

| Field       | Type         | Null | Key | Default           | Extra                       |

+-------------+--------------+------+-----+-------------------+-----------------------------+

| id          | bigint(16)   | NO   | PRI | NULL              | auto_increment              |

| u_id        | varchar(128) | NO   | MUL | NULL              |                             |

| u_name      | varchar(128) | YES  |     | NULL              |                             |

| dept_name   | varchar(128) | YES  |     | NULL              |                             |

| create_time | timestamp    | YES  |     | CURRENT_TIMESTAMP |                             |

| update_time | timestamp    | YES  |     | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |

+-------------+--------------+------+-----+-------------------+-----------------------------+

<insert id="addMaster" parameterType="com.xxx.smart.group.model.AddMaster" >INSERT INTO t_mc_store_group_master (id,u_id,u_name,dept_name)VALUES (#{masterId},#{uid},#{uName},#{deptName})<selectKey resultType="Integer" order="AFTER" keyProperty="masterId">SELECT LAST_INSERT_ID() AS masterId</selectKey></insert>

• 组合查询设置不存在的列

 <select id="queryUserList" parameterType="hashmap" resultType="com.xxx.smart.group.model.User">SELECTtu.id casualId,tu.name name,tu.expire_time validdate,tu.pb_upload,tu.pb_down,tu.pb_share,tu.pb_rename,tu.pb_view,tu.pb_delete,tu.account,IF(ul.id>0,1,0) statusFROM t_mc_store_casual_user tuJOIN t_mc_store_manage_department md ON tu.dept_id = md.dept_idLEFT JOIN t_mc_store_user_lock ul ON tu.account = ul.accountWHERE md.u_id = #{uid}AND tu.is_delete = 0LIMIT #{index},#{pageSize}
</select>

• 原生SQL语句

<select id="queryExpireUser" parameterType="hashmap" resultType="com.xxx.smart.group.model.ExpireUser"><![CDATA[
SELECTaccount,passwordFROMt_mc_store_casual_userWHERE expire_time <= #{endTime}AND expire_time > #{beginTime}AND is_delete = 0]]></select>