浅谈MyBatis循环Map(高级用法)

//service：
public List<UserDepte> getByMap(Map<String,List<Long>> map){
    Map<String,Object> paramsMap= new HashMap<String, Object>();
    params.put("paramsMap", map);
    return this.getByMap(paramsMap);  
}
//dao:
int getByMap(Map<String,Object> map)

//service直接调用dao
int getByMap(@param("paramsMap") Map<String,Object> map)

<foreach collection="paramsMap.keys" item="k" separator="and">  
  ${k} = #{k}  
</foreach> 

<foreach collection="paramsMap.values" item="v" separator="and">  
  ${v} = #{v}  
</foreach> 

<foreach collection="paramsMap.keys" item="k" separator="and">  
  <if test="null != paramsMap[k]">  
    ${k} = ${paramsMap[k]}  
  </if> 
</foreach> 

<foreach collection="paramsMap" index="key" item="value">
  #{key} = #{value}
</foreach>

<foreach collection="paramsMap.keys" item="k" separator=",">  
  <if test="null != paramsMap[k]">  
    ${k} = #{paramsMap[k]}  
  </if> 
</foreach> 

<foreach collection="paramsMap.keys" item="k" separator=",">  
  <if test="null != paramsMap[k]">  
    ${k} = #{paramsMap[${k}]} <!-- 请注意这种写法，我个人还是喜欢一次性获取key和value的写法 -->
  </if> 
</foreach> 

select * from 表名
where (
  (id = 1 and name in ('悟空','唐僧','八戒') or
  (id = 2 and name in ('刘备','张飞','关羽') or
  (id = 3 and name in ('小三','王五','王八') or
  ……
)

Map<String,List<String>> map = new HashMap<>();
List<String> nameList = new ArrayList<>();
nameList.add("悟空");
nameList.add("唐僧");
nameList.add("八戒");
map.put("1",nameList);

nameList = new ArrayList<>();
nameList.add("刘备");
nameList.add("张飞");
nameList.add("关羽");
map.put("2",nameList);

SELECT * FROM 表名
WHERE 
<foreach collection="paramsMap.keys" item="key" open="(" separator="OR" close=")">
  (id = #{key} AND name in
  <foreach collection = "paramsMap[key]" item="name" separator="," open="(" close=")">
    #{name}
  </foreach>
  )
</foreach>

SELECT * FROM 表名
WHERE 
<foreach collection="paramsMap" index="key" item="value" open="(" separator="OR" close=")">
  (id = #{key} AND name in
  <foreach collection = "value" item="name" separator="," open="(" close=")">
    #{name}
  </foreach>
  )
</foreach>