Recently used MySQL and mybatis to combine common knowledge points to sit down and organize

1. When using the set in (X,x ... The parameters can be single or multiple when they are single:

Findbyids (list<long> IDs), or Findbyids (Long [] IDs)

<select id= "Findbyidsmap" resultmap= "Baseresultmap" >

Select

<include refid= "Base_column_list"/>

From Jria where ID in

Open= "(" separator= "," close= ")" >
#{item}
</foreach>

collection= "Array" when an array is set

2 When there are multiple parameters for a query, such as Findbyids (String name, long[] IDs)

This situation requires special attention, when passing parameters, be sure to use the map mode, so that the collection property can specify the name

Here is an example

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 Jria where ID in
<foreach item= "item" index= "index" collection= "IDs "
open= "(" separator= "," close= ")" >
#{item}
</foreach> 
</select>

Recently used MySQL and mybatis to combine common knowledge points to sit down and organize