Question

I want to uapdate a table field with an array.That means i have a table with name test.In that table i inserted some rows first.

After some process i want to update a filed in this table with ana array value.When i inserting rows into this table at that time this filed is set to 0.

After some process some values returned to a variable $var like:

Array
(
    [id] => "http://www.google.com/calendar/"
    [etag] => "GEwNTgxHfip7JGA6WhJV"

    [link] => "http://www.google.com/calendar/"

)

This is the code iam using for updating field:

$idg= json_encode($var);
mysql_query("UPDATE `test` SET `tk` = '$idg' WHERE `TID` =10");

The above code is the edited code .The $idg now have:

{"id":"http:\/\/www.google.com\/calendar\/feeds\/testid%40gmail.com\/events\/64h9vc0qqqtlqeqhudhhdqbsds","etag":"\"GEwCQwxGeSp7JGA6WhJV\"\r","link":"http:\/\/www.google.com\/calendar\/feeds\/testid%40gmail.com\/private\/full\/64h9vc0qqqtlqeqhudhhdqbsds\r"}

After excuting this code the field will updated with null value.This is the problem facing now.

Answer 1

Since your table column can only contain a scalar value you have to convert the array into some string representation, e.g. via json_encode().
When you fetch the value from the table again you have to convert it back, in this case via json_decode().

---

edit: or use a storage mechanism/database that can handle this type of data, e.g. a document based database like mongodb.

---

edit2: add parameter encoding, error handling and debug code

<?php
echo "start\n";

$tid = 10;
$idg = json_encode($var);
$idg_sql = mysql_real_escape_string($idg);

$query = "
    UPDATE
        `test`
    SET
        `tk` = '$idg_sql'
    WHERE
        `TID` = $tid
";

$result = mysql_query($query);
if ( !$result ) {
    die(mysql_error());
}

if ( 1 < mysql_affected_rows() ) {
    // debugging
    echo "no affected rows\n";
    $result = mysql_query("SELECT Count(*) as c FROM `test` WHERE `TID`=$tid") or die(mysql_error());
    while( false!==($row=mysql_fetch_assoc($result)) ) {
        var_dump($row);
    }
}

echo "done.\n";