轉載自:html
http://www.cnblogs.com/lcwlovell/archive/2011/12/17/2291110.htmljava
http://www.tuicool.com/articles/q2mui2web
1、單個參數:sql
public List<XXBean> getXXBeanList(String xxCode); <select id="getXXXBeanList" parameterType="java.lang.String" resultType="XXBean"> select t.* from tableName t where t.id= #{id} </select> 其中方法名和ID一致,#{}中的參數名與方法中的參數名一直, 我這裏採用的是XXXBean是採用的短名字, select 後的字段列表要和bean中的屬性名一致, 若是不一致的能夠用 as 來補充。
2、多參數:session
一、第一種方案:dao層的函數方法mybatis
public List<XXXBean> getXXXBeanList(String xxId, String xxCode); <select id="getXXXBeanList" resultType="XXBean"> select t.* from tableName where id = #{0} and name = #{1} </select> 因爲是多參數那麼就不能使用parameterType, 改用#{index}是第幾個就用第幾個的索引,索引從0開始
其中,#{0}表明接收的是dao層中的第一個參數,#{1}表明dao層中第二參數,更多參數一致日後加便可。
二、第二種方案:Map傳多參數oracle
ex1:app
public List<XXXBean> getXXXBeanList(HashMap map); <select id="getXXXBeanList" parameterType="hashmap" resultType="XXBean"> select 字段... from XXX where id=#{xxId} code = #{xxCode} </select> 其中hashmap是mybatis本身配置好的直接使用就行。map中key的名字是那個就在#{}使用那個,map如何封裝就不用了我說了吧。
ex2:
Dao層的函數方法 函數
Public
User
selectUser(Map paramMap);
ui
對應的Mapper.xml
<
select
id=
" selectUser"
resultMap=
"BaseResultMap"
>
select
*
from
user_user_t
where
user_name = #{userName,jdbcType=
VARCHAR
}
and
user_area=#{userArea,jdbcType=
VARCHAR
}
</
select
>
Service層調用
Private
User
xxxSelectUser(){
Map paramMap=new hashMap();
paramMap.put(「userName」,」對應具體的參數值」);
paramMap.put(「userArea」,」對應具體的參數值」);
User
user
=xxx. selectUser(paramMap);}
我的認爲此方法不夠直觀,見到接口方法不能直接的知道要傳的參數是什麼。
ex3:
<!--
使用HashMap傳遞多個參數
parameterType 能夠是別名或徹底限定名 ,map->java.util.Map,這兩個都是能夠的
-->
<selectid=
"selectBlogByMap"
parameterType=
"map"
resultType=
"Blog"
>
SELECT t.ID, t.title, t.content
FROM blog t
WHERE t.title = #{h_title}
AND t.content =#{h_content}
</select>
/**
* 經過Map傳遞多個參數
*/
@Test
public
void
testSelectByMap() {
SqlSession session = sqlSessionFactory.openSession();
Map<String, Object> param=
new
HashMap<String, Object>();
param.put(
"h_title"
,
"oracle"
);
param.put(
"h_content"
,
"使用序列!"
);
Blog blog = (Blog)session.selectOne(
"cn.enjoylife.BlogMapper.selectBlogByMap"
,param);
session.close();
System.out.println(
"blog title:"
+blog.getTitle());
}
三、多參數傳遞之註解方式示:
ex1:
例子: public AddrInfo getAddrInfo(@Param("corpId")int corpId, @Param("addrId")int addrId); xml配置這樣寫: <select id="getAddrInfo" resultMap="com.xxx.xxx.AddrInfo"> SELECT * FROM addr__info where addr_id=#{addrId} and corp_id=#{corpId} </select> 之前在<select>語句中要帶parameterType的,如今能夠不要這樣寫。
ex2:
Dao層的函數方法
PublicUserselectUser(@param(「userName」)Stringname,@param(「userArea」)String area);
對應的Mapper.xml
<
select
id=
" selectUser"
resultMap=
"BaseResultMap"
>
select
*
from
user_user_t
where
user_name = #{userName,jdbcType=
VARCHAR
}
and
user_area=#{userArea,jdbcType=
VARCHAR
}
</
select
>
4、使用JavaBean
<!-- 使用JavaBean傳遞多個參數 -->
<selectid=
"selectBlogByBean"
parameterType=
"Blog"
resultType=
"Blog"
>
SELECT t.ID, t.title, t.content
FROM blog t
WHERE t.title = #{title}
AND t.content =#{content}
</select>
/**
* 經過JavaBean傳遞多個參數
*/
@Test
public
void
testSelectByBean() {
SqlSession session = sqlSessionFactory.openSession();
Blog blog=
new
Blog();
blog.setTitle(
"oracle"
);
blog.setContent(
"使用序列!"
);
Blog newBlog = (Blog)session.selectOne(
"cn.enjoylife.BlogMapper.selectBlogByBean"
,blog);
session.close();
System.out.println(
"new Blog ID:"
+newBlog.getId());
}
5、List封裝in:
public List<XXXBean> getXXXBeanList(List<String> list); <select id="getXXXBeanList" resultType="XXBean"> select 字段... from XXX where id in <foreach item="item" index="index" collection="list" open="(" separator="," close=")"> #{item} </foreach> </select> foreach 最後的效果是select 字段... from XXX where id in ('1','2','3','4')
6、selectList()只能傳遞一個參數,但實際所需參數既要包含String類型,又要包含List類型時的處理方法: 5、List封裝in:
將參數放入Map,再取出Map中的List遍歷。以下:
List<String> list_3 = new ArrayList<String>(); Map<String, Object> map2 = new HashMap<String, Object>(); list.add("1");
list.add("2");
map.put("list", list); //網址id map.put("siteTag", "0");//網址類型
public List<SysWeb> getSysInfo(Map<String, Object> map2) { return getSqlSession().selectList("sysweb.getSysInfo", map2); }
<select id="getSysInfo" parameterType="java.util.Map" resultType="SysWeb"> select t.sysSiteId, t.siteName, t1.mzNum as siteTagNum, t1.mzName as siteTag, t.url, t.iconPath from TD_WEB_SYSSITE t left join TD_MZ_MZDY t1 on t1.mzNum = t.siteTag and t1.mzType = 10 WHERE t.siteTag = #{siteTag } and t.sysSiteId not in <foreach collection="list" item="item" index="index" open="(" close=")" separator=","> #{item} </foreach> </select>