MariaDB starting with 10.2.3

JSON functions were added in MariaDB 10.2.3.

Syntax

JSON_UNQUOTE(val)

Description

Unquotes a JSON value, returning a string, or NULL if the argument is null.

An error will occur if the given value begins and ends with double quotes and is an invalid JSON string literal.

Certain character sequences have special meanings within a string. Usually, a backspace is ignored, but the escape sequences in the table below are recognised by MariaDB, unless the SQL Mode is set to NO_BACKSLASH_ESCAPES SQL.

Escape sequenceCharacter
\"Double quote (")
\bBackspace
\fFormfeed
\nNewline (linefeed)
\rCarriage return
\tTab
\\Backslash (\)
\uXXXXUTF-8 bytes for Unicode value XXXX

Examples

SELECT JSON_UNQUOTE('"Monty"');
+-------------------------+
| JSON_UNQUOTE('"Monty"') |
+-------------------------+
| Monty                   |
+-------------------------+

With the default SQL Mode:

SELECT JSON_UNQUOTE('Si\bng\ting');
+-----------------------------+
| JSON_UNQUOTE('Si\bng\ting') |
+-----------------------------+
| Sng	ing                   |
+-----------------------------+

Setting NO_BACKSLASH_ESCAPES:

SET @@sql_mode = 'NO_BACKSLASH_ESCAPES';

SELECT JSON_UNQUOTE('Si\bng\ting');
+-----------------------------+
| JSON_UNQUOTE('Si\bng\ting') |
+-----------------------------+
| Si\bng\ting                 |
+-----------------------------+

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