mybatis Annotation How to Implement Object Batch Change

mybatis Annotation Object Bulk Change

1. Introduction

When there are multiple objects that need to be changed, batch modify the object collection List

2. Code

@Update("<script>"
+ "<foreach collection='listUserAnswerRecord' item='item' open='' close=''  separator=';'> "
+ " update t_qb_record_201910"
+ " set answered = 0, progress = 1, answer_sheet = null, gmt_update = #{item.gmtUpdate}"
+ " <where>"
+ "<choose>"
+ "<when test='item.unionid !=null'> unionid=#{item.unionid}</when>"
+ "<otherwise> openid= #{item.openid} </otherwise>"
+ "</choose>"
+ " and goods_id = #{item.goodsId} and charpter_id = #{item.charpterId} and type = #{item.type}"
+ "</where>"
+ "</foreach>"
+ "</script>")
Integer deleteUserAnswerSheet(@Param("listUserAnswerRecord") List<UserAnswerRecordNew> listUserAnswerRecord);

mybatis Annotation Bulk Update, Insert

// Bulk insertion 
	@Insert({
        "<script>",
        "insert into table(column1, column2) values ",
        "<foreach collection='userLists' item='item' index='index' separator=','>",
        "(#{item.column1}, #{item.column2} )",
        "</foreach>",
        "</script>"
	})
	public int insertUsers(@Param(value="userLists") List<User> userLists);
// Batch update 
@Update({
		"<script>",
		"<foreach collection='userLists' item='item' index='index' separator=';'>",
		"update table b",
		"set b.column1= #{item.column1} , b.column2= #{item.column2}  where b.column3= #{item.column3}",
		"</foreach>",
		"</script>"
    })
    public int updateUser(@Param(value="userLists") List<User> userLists);

collection : The collection you sent

item : Classes inside

index Is the i of the for loop

separator : Spacer