select的输入和输出
例如 select id,name,age from user where name like '%王%' and age>20
这里既有输入也有输出
select的属性
id,parameterClass,resultClass,parameterMap,resultMap,cacheModel
resultSetType,fetchSize,xmlResultName,remapResults,timeout
输入 parameterClass,ParameterMap
resultSetTYpe为结果集类型,主要是说游标,具有方向性,可以取
forward_only,scoll_insensitive,scoll_sensitive,具体情况具体配置
fetchSize 预取回数据量的大小
xmlResultName,返回result为xml的名称
如果返回的结果可以修改则吧remapResults设为true,否则设为false
输入,用参数带进来
可以是#,$做为占位符
不同占位符使用
Xml代码
1. <SPAN style="FONT-SIZE: small"><select id="getAllUsers1" resultClass="com.mypackage.User"
2. parameterClass="string">
3. DEPARTMENT=#department#
4. </select>
5. <select id="getAllUsers1" resultClass="com.mypackage.User"
6. parameterClass="string">
7. SELECT * FROM USER WHERE DEPARTMENT like '$department$'
8. </select>
9. </SPAN>
<select id="getAllUsers1" resultClass="com.mypackage.User"
parameterClass="string">
SELECT * FROM USER WHERE DEPARTMENT=#department#
</select>
<select id="getAllUsers1" resultClass="com.mypackage.User"
parameterClass="string">
SELECT * FROM USER WHERE DEPARTMENT like '$department$'
</select>
#不能放在‘’之内
resultMap
Xml代码
1. <SPAN style="FONT-SIZE: small"><!-- 无映射 -->
2. <select id="getAllUsers1" resultClass="User"
3. parameterClass="string">
4. DEPARTMENT=#department#
5. </select>
6.
7. <!-- 内联映射->实体类 -->
8. <select id="getAllUsers2" resultClass="User"
9. parameterClass="string">
10. SELECT USERID as userid, USERNAME as username, PASSWORD as
11. password, DEPARTMENT as department FROM USER WHERE
12. DEPARTMENT=#department#
13. </select>
14.
15. <!-- 内联映射->MAP类 -->
16. <select id="getAllUsers3" resultClass="hashmap"
17. parameterClass="string">
18. DEPARTMENT=#department#
19. </select>
20.
21. <!-- 显示映射->实体类 -->
22. <resultMap id="accoutResult" class="User">
23. <result property="userid" column="USERID" />
24. <result property="username" column="USERNAME" />
25. <result property="password" column="PASSWORD" />
26. <result property="department" column="DEPARTMENT" />
27. </resultMap>
28. <select id="getAllUsers4" resultMap="accoutResult"
29. parameterClass="string">
30. DEPARTMENT=#department#
31. </select>
32.
33. <!-- 显示映射->MAP类 -->
34. <resultMap id="mapResult" class="hashmap">
35. <result property="userid" column="USERID" />
36. <result property="username" column="USERNAME" />
37. <result property="password" column="PASSWORD" />
38. <result property="department" column="DEPARTMENT" />
39. </resultMap>
40. <select id="getAllUsers5" resultMap="mapResult"
41. parameterClass="string">
42. DEPARTMENT=#department#
43. </select>
44.
45. </SPAN>
<!-- 无映射 -->
<select id="getAllUsers1" resultClass="User"
parameterClass="string">
SELECT * FROM USER WHERE DEPARTMENT=#department#
</select>
<!-- 内联映射->实体类 -->
<select id="getAllUsers2" resultClass="User"
parameterClass="string">
SELECT USERID as userid, USERNAME as username, PASSWORD as
password, DEPARTMENT as department FROM USER WHERE
DEPARTMENT=#department#
</select>
<!-- 内联映射->MAP类 -->
<select id="getAllUsers3" resultClass="hashmap"
parameterClass="string">
SELECT * FROM USER WHERE DEPARTMENT=#department#
</select>
<!-- 显示映射->实体类 -->
<resultMap id="accoutResult" class="User">
<result property="userid" column="USERID" />
<result property="username" column="USERNAME" />
<result property="password" column="PASSWORD" />
<result property="department" column="DEPARTMENT" />
</resultMap>
<select id="getAllUsers4" resultMap="accoutResult"
parameterClass="string">
SELECT * FROM USER WHERE DEPARTMENT=#department#
</select>
<!-- 显示映射->MAP类 -->
<resultMap id="mapResult" class="hashmap">
<result property="userid" column="USERID" />
<result property="username" column="USERNAME" />
<result property="password" column="PASSWORD" />
<result property="department" column="DEPARTMENT" />
</resultMap>
<select id="getAllUsers5" resultMap="mapResult"
parameterClass="string">
SELECT * FROM USER WHERE DEPARTMENT=#department#
</select>
map映射 ,返回的list里的每一项都是一个map然后有键值对
xml映射
Xml代码
1. <SPAN style="FONT-SIZE: small"><!-- XML -->
2. <select id="selectXML" parameterClass="string" resultClass="xml"
3. xmlResultName="log">
4. GROUPNAME=#groupName#
5. </select>
6. </SPAN>
<!-- XML -->
<select id="selectXML" parameterClass="string" resultClass="xml"
xmlResultName="log">
SELECT * FROM USER_ACCOUNT WHERE GROUPNAME=#groupName#
</select>
resultClass="xml"这个xml也是预定义好的类
在测试类里调用后返回的是xml格式的字符串,指定的xmlResultName相当于xml的
根元素
返回结果有三类,1 返回直接指定的类 2 返回map类型 3 返回xml