[英]How to count json items in mysql
I have table channels:我有桌子频道:
+----+----------------+---------+
| id | sort | bouquet |
+----+----------------+---------+
| 1 | ["2","3","73"] | ["1"] |
| 12 | ["3","73"] | ["28"] |
+----+----------------+---------+
And need to get count items in sort field for specific boquet...for example:并且需要在特定 boquet 的排序字段中获取计数项目......例如:
bouquet 1 have 3 sort items bouquet 12 have 2 sort items花束 1 有 3 个排序项目 花束 12 有 2 个排序项目
I try using this query in mysql but i did not get idea how can i calculate number of items in sort field:我尝试在 mysql 中使用此查询,但我不知道如何计算排序字段中的项目数:
SELECT COUNT(sort) AS total_channels
FROM channels
WHERE JSON_SEARCH(bouquet, 'one', "1") IS NOT NULL;
I always get:我总是得到:
+----------------+
| total_channels |
+----------------+
| 1 |
+----------------+
Which is incorrect.这是不正确的。
Using above help i come to this:使用上面的帮助我来到这个:
SELECT JSON_LENGTH(sort) FROM channels WHERE bouquet='["1"]';
And i get correct count:我得到正确的计数:
mysql> SELECT JSON_LENGTH(sort) FROM channels WHERE bouquet='["28"]';
+-------------------+
| JSON_LENGTH(sort) |
+-------------------+
| 2 |
+-------------------+
1 row in set (0.00 sec)
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