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_DOUBLE is for all numeric data. Javascript has only one numeric type.
• JSON_SPLICE_STRING is for all text and binary types.
• JSON_SPLICE_JSON is for all valid Javascript types, including true, 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

mysql> select json_splice_json('[1,2,3]', 2, 3, '[4,5,6]') as nested;
+---------------+
| nested        |
+---------------+
| [1,2,[4,5,6]] |
+---------------+

mysql> select json_splice_string('[1,2,3,4,5]', 2, 2, 'o', 'hai', '!') as ohai;
+-----------------------+
| ohai                  |
+-----------------------+
| [1,2,"o","hai","!",5] |
+-----------------------+

mysql> select json_splice_string('[1,2,3,4,5]', -1, 1) as pop;
+-----------+
| pop       |
+-----------+
| [1,2,3,4] |
+-----------+

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