mysql> SET @`json` :=
-> '[
'> {
'> "id": 1, "type": 2
'> },
'> {
'> "id": 2, "type": 1
'> }
'> ]';
Query OK, 0 rows affected (0.00 sec)
Du kan få alla ids
i en array:
mysql> SELECT JSON_EXTRACT(@`json` ,'$[*].id');
+----------------------------------+
| JSON_EXTRACT(@`json` ,'$[*].id') |
+----------------------------------+
| [1, 2] |
+----------------------------------+
1 row in set (0.00 sec)
Kan komma åt varje JSON ids
:
mysql> SELECT JSON_EXTRACT(@`json` ,'$[0].id');
+----------------------------------+
| JSON_EXTRACT(@`json` ,'$[0].id') |
+----------------------------------+
| 1 |
+----------------------------------+
1 row in set (0.00 sec)
Försök:
mysql> DROP PROCEDURE IF EXISTS `new_procedure`;
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER //
mysql> CREATE PROCEDURE `new_procedure`(`json` JSON)
-> BEGIN
-> DECLARE `json_items` BIGINT UNSIGNED DEFAULT JSON_LENGTH(`json`);
-> DECLARE `_index` BIGINT UNSIGNED DEFAULT 0;
->
-> DROP TEMPORARY TABLE IF EXISTS `jsonTemporary`;
->
-> CREATE TEMPORARY TABLE IF NOT EXISTS `jsonTemporary`
-> (`id` BIGINT UNSIGNED NOT NULL);
->
-> WHILE `_index` < `json_items` DO
-> INSERT INTO `jsonTemporary` (`id`)
-> VALUES (JSON_EXTRACT(`json`, CONCAT('$[', `_index`, '].id')));
-> SET `_index` := `_index` + 1;
-> END WHILE;
->
-> SELECT `id` FROM `jsonTemporary`;
-> DROP TEMPORARY TABLE IF EXISTS `jsonTemporary`;
-> END//
Query OK, 0 rows affected (0.00 sec)
mysql> DELIMITER ;
mysql> CALL `new_procedure`(@`json`);
+----+
| id |
+----+
| 1 |
| 2 |
+----+
2 rows in set (0.00 sec)
Query OK, 0 rows affected (0.00 sec)
Se db-fiddle .