How to store JSON string in MySQL db

Question

I\'m storing JSON data in a MySQL table using the code below. It works fine if the JSON is short but breaks for longer text. The \"field_json\" is a LONGTEXT.

Answer 1

You need to escape the quotes in your JSON string - otherwise they terminate the SQL-Query resulting in the exception you got.

Answer 2

try this

    $json_string = mysql_real_escape_string( $json_string );
    $sql = sprintf("UPDATE mytable 
    SET field_json = '$json_string'
    WHERE id = $userid");
    $result = mysql_query($sql);

Answer 3

Use place holders otherwise you are susceptible to SQL injection: http://php.net/manual/en/mysqli.quickstart.prepared-statements.php

Otherwise, here's a quick fix: http://php.net/manual/en/function.mysql-real-escape-string.php

$sql = sprintf(
        "UPDATE mytable SET field_json = '%s' WHERE id = '%s'",
        mysql_real_escape_string($json_string),
        mysql_real_escape_string($userid)
);
$result = mysql_query($sql);

EDIT

Please use PDO ( http://www.php.net/manual/en/book.pdo.php ). The mysql extension has been deprecated as of 5.5

Answer 4

Escape the JSON string:

$json_string = mysql_real_escape_string( $json_string);

$sql = sprintf("UPDATE mytable 
    SET field_json = '$json_string'
    WHERE id = $userid");
$result = mysql_query($sql);