On 02/06/15 23:20, Aziz Saleh wrote:
On Tue, Jun 2, 2015 at 11:08 PM, Ron Piggott <ron.pigg...@actsministries.org <mailto:ron.pigg...@actsministries.org>> wrote:



    On 02/06/15 22:58, Aziz Saleh wrote:


    On Tue, Jun 2, 2015 at 10:50 PM, Ron Piggott
    <ron.pigg...@actsministries.org
    <mailto:ron.pigg...@actsministries.org>> wrote:


        I am working through the process of removing \'s from the
        database. I am trying to get this query using a variable
        starting with "<<<"

        $query1  =<<<EOF
        UPDATE `TABLE_NAME` SET `COLUMN_NAME` =
        
REPLACE(REPLACE(REPLACE(`COLUMN_NAME`,'\\\'','\''),'\\\"','"'),'\\\\','\\');
        EOF;

        But when I go to execute the query I am getting the error:

        |#1064 - You have an error in your SQL syntax; check the
        manual that corresponds to your MariaDB server version for
        the right syntax to use near '\''),'\\"','"'),'\\','\')' at
        line 1 |

        Could someone help me know what \ and ' should be part of
        this query so it will execute correctly --- only removing \'s
        from the database table text columns?

        Thank you.

        Ron


    When you say remove, as replace all occurrences with an empty
    string, or replace with a different character?
    I want \" to become just "
    I want \' to become just '
    I also want however \ was escaped to become just \

    (I am trying to revert the text back to what it was originally
    before mysql_escape_string was applied)

    I hope this helps elaborate.

    Ron


For simplicity sake, do each one in its own query and see which one breaks if any:


$query1  =<<<EOF
UPDATE `TABLE_NAME` SET `COLUMN_NAME` = REPLACE(`COLUMN_NAME`,'\"','"')
EOF;
$query2  =<<<EOF
UPDATE `TABLE_NAME` SET `COLUMN_NAME` = REPLACE(`COLUMN_NAME`,"\'","'")
EOF;
$query3  =<<<EOF
UPDATE `TABLE_NAME` SET `COLUMN_NAME` = REPLACE(`COLUMN_NAME`,'\\\\','\\')
EOF;

However, personally, I do not recommend this sort of action. Your data should be escaped in the DB. Your MySQL driver should be handling the escape/un-escape when setting/retrieving the data.
A friend pointed out to me today: In the earlier versions of PHP there was a setting called 'magic_quotes_gpc'. When enabled slashes were added by default. This setting has since been depreciated as of PHP 5.3 and was removed completely in PHP 5.4. I am using PHP 5.6.

Thank you for the suggestion of running 3 separate commands. Individually these execute successfully. Is it even possible to do a "REPLACE" in the fashion I have noted?

Ron

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