- 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_master
WHERE 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 g
WHERE gm.id = g.master_id
AND 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 isMaster
FROM
t_mc_store_group g,
t_mc_store_group_master gm
WHERE gm.id = g.master_id
AND g.id = #{groupId}
</select>
- 对应的xx接口解析
- selectKey的使用
<!-- 这里需要说明一下不同的数据库主键的生成，对各自的数据库有不同的方式： -->
<!-- mysql:SELECT LAST_INSERT_ID() AS VALUE -->
<!-- mssql:select @@IDENTITY as value -->
<!-- oracle:SELECT STOCKIDSEQUENCE.NEXTVAL AS VALUE FROM DUAL -->
<!-- 还有一点需要注意的是不同的数据库生产商生成主键的方式不一样，有些是预先生成 (pre-generate)主键的，如Oracle和PostgreSQL。
有些是事后生成(post-generate)主键的，如MySQL和SQL Server 所以如果是Oracle数据库，则需要将selectKey写在insert之前 -->
注意：插入的时候id可以省略，但masterId必须对应的上AddMaster这个JavaBean的masterId属性。
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>