@PathVariable, @RequestBody, @Param使用场景? 为什么用它?

@RequestMapping("/info/{attrGroupId}")
public R info(@PathVariable("attrGroupId") Long attrGroupId){
1
2

@PostMapping("/attr/relation/delete")
public R deleteRelation(@RequestBody AttrGroupRelationVo[] vos) {
1
2

void deleteBatchRelation(@Param("entities") List<AttrAttrgroupRelationEntity> entities);
1

<delete id="deleteBatchRelation">
    DELETE FROM `pms_attr_attrgroup_relation` where 
    <foreach collection="entities" item="item" separator=" OR ">
        (attr_id=#{item.attrId} AND attr_group_id=#{item.groupId})
    foreach>
delete>
1
2
3
4
5
6