SQL--IN (the background is list, the solution of using in operation in sql)

The backend is passed into the list (put it in the map), when sql is in judgment, the operation is as follows

[Method 1] Use foreach in Mybits

<select id="*" parameterType="map" resultType="map">
SELECT *  WHERE  条件1
<if test="传进的List名.size()>0">
		AND 要查询的变量 IN
		<foreach collection="传进的List名" index="index" item="id" open="(" separator="," close=")">
			#{id}
		</foreach>
</if>
FROM 表名
</select>

The foreach attributes mainly include item, index, collection, open, separator, and close.

1. The alias of the element when the item loops,

2. Index is equivalent to int i in the for loop,

3. What does open start with,

4. Separator separator,

5. What does close end with,

6. Collection attribute, key in map

[Method 2] String splicing, (not tested)

String a = "("+list.get(0);
for (int i = 1 ;i<list.size();i++){
    a=a+","+list.get(i);
}
a=a+")";