Question

i’m trying to update some big table in this way:

<?php
   $tables = array("table1","table2","table3","table4","table5");
   foreach ($tables as $table) {
      $res = mysql_query("SELECT * FROM {$table}");
      while($row = mysql_fetch_array($res)){
        $data = $row['data'];
        $data = gmdate('Y-m-d H:i:s', strtotime($data));
        mysql_query("UPDATE {$table} SET data='$data' WHERE user_id='".$row['user_id']."'";);
      }     
   }
?>

Every tables have about 80.000 rows and process will take too much time to finish. How can i solve this using an equivalent function of gmdate in mysql? Thanks! 🙂

Answer 1

you can use mysql’s STR_TO_DATE function to update, use this function in update query. try this

SELECT STR_TO_DATE("Fri, 23 Nov 2012 10:00:27 +0000", "%a, %d %b %Y %H:%i:%s +0000");

use output ot STR_TO_DATE and put it in the format you needed.

you can use following single update query

mysql_query('UPDATE {$table} SET data= STR_TO_DATE(YOURDATACOLUMN, "%a, %d %b %Y %H:%i:%s +0000"); WHERE user_id="'.$row['user_id'].'"';);