JSON_SPLICE_<type>
This is a set of three JSON functions, which deletes the given element indexes from an array, and optionally splices the new values in.
Arrays are in the form:
[1, 2, 3]
JSON_SPLICE_DOUBLEis for all numeric data. Javascript has only one numeric type.JSON_SPLICE_STRINGis for all text and binary types.JSON_SPLICE_JSONis for all valid Javascript types, includingtrue,false, JSON maps, and lists.
JSON_SPLICE_<type>(json, start, length, value, [value, ...])
Arguments
json: a valid JSON array, or the name of a JSON column.
start: the zero-indexed start position. This argument may also be negative, in which case it counts from the end of the array.
length: the number of array elements to delete.
value: any number of values as optional arguments. If no values are given, the elements in positions from start to start + length will simply be removed.
Return Value
The complete array
SQL NULL if json is not a valid JSON array
Examples
SELECT JSON_SPLICE_JSON('[1,2,3]', 2, 3, '[4,5,6]') AS nested;
+---------------+
| nested |
+---------------+
| [1,2,[4,5,6]] |
+---------------+
SELECT JSON_SPLICE_STRING('[1,2,3,4,5]', 2, 2, 'o', 'hai', '!') AS ohai;
+-----------------------+
| ohai |
+-----------------------+
| [1,2,"o","hai","!",5] |
+-----------------------+
SELECT JSON_SPLICE_STRING('[1,2,3,4,5]', -1, 1) AS pop;
+-----------+
| pop |
+-----------+
| [1,2,3,4] |
+-----------+
Notice
A JSON or Javascript null value is distinct from SQL NULL.