1. 當查詢的參數只有一個時
findByIds(List<Long> ids)
1.1 若是參數的類型是List, 則在使用時,collection屬性要必須指定爲 listjava
<select id="findByIdsMap" resultMap="BaseResultMap">code
Select xml
<include refid="Base_Column_List" />blog
from jria where ID in get
<foreach item="item" index="index" collection="list" open="(" separator="," close=")">it
#{item} io
</foreach>class
</select>test
<select id="findByIdsMap" resultMap="BaseResultMap"> Select <include refid="Base_Column_List" /> from jria where ID in <foreach item="item" index="index" collection="list" open="(" separator="," close=")"> #{item} </foreach> </select>
findByIds(Long[] ids)
1.2 若是參數的類型是Array,則在使用時,collection屬性要必須指定爲 array
<select id="findByIdsMap" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from tabs where ID in
<foreach item="item" index="index" collection="array" open="(" separator="," close=")">
#{item}
</foreach>
</select>
<select id="findByIdsMap" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from tabs where ID in <foreach item="item" index="index" collection="array" open="(" separator="," close=")"> #{item} </foreach> </select>
2. 當查詢的參數有多個時,例如 findByIds(String name, Long[] ids)
這種狀況須要特別注意,在傳參數時,必定要改用Map方式, 這樣在collection屬性能夠指定名稱
下面是一個示例
Map<String, Object> params = new HashMap<String, Object>(2);
params.put("name", name);
params.put("ids", ids);
mapper.findByIdsMap(params);
<select id="findByIdsMap" resultMap="BaseResultMap"> select <include refid="Base_Column_List" /> from tabs where <if test="_parameter.containsKey('ids')"> ID in <foreach item="item" index="index" collection="ids" open="(" separator="," close=")"> #{item} </foreach> </if><if test="_parameter.containsKey('issue')">name=#{name}</if></select>