php - Duplicating a mysql row with null variables -


I have a table with multiple columns I have a function that has an update in my new line Duplicated with auto-incremented ID.

The function, however, on some of my INT columns, sometimes I have a tap as the default when the record is repeated, it changes my null placement to 0.

I am assuming this because I am assuming "code". ''

Can anyone help me how i value zero value ".null." I can include as and my other values ​​are ''. Value '. '?

Edit I am having trouble in differentiating a null and a blank value. I have tried empty () and is_null () and with no value a varchar and INT is not showing a difference with a zero value

Note : < em> I understand that I am using an old MySQL extension. For now, I'm just trying to process my tap variable properly. Function DuplicateTorrent ($ table, $ id_field, $ id_value) {// Copy copy of the record you wish to clone $ unit = mysql_fetch_array (mysql_query ("Select * From {$ table} where {$ id_field} = {$ id_value} "), MYSQL_ASSOC) or die (" Could not select original record "); // Automatically set the value of the increased IDs to clear if you forget this step, then nothing will work because we do not have two records with the same ID $ unit [$ id_field] = "" Can; // Original record mysql_query ("INSERT INTO {$ table}" (".implode (", ", array_keys ($ unit).") Value ('' .implode ('', '', clone copy of array_values Inserted ($ institution)). "') Or die (mysql_error ()); // returns the new id mysql_insert_id ();}

You do not need to bring data into PHP only to send it back to MySQL: A single SQL command that basically resides within Shebang database Enables you to move.

However, you need to exclude $ id_field from the operation, so you can not use the * wildcard but instead the column names should be clearly listed. It combines some complexity, especially for operation in a safe, injection-proof way: 

  function duplicate ($ table $ id_field, $ id_value) {// SQL injection Stop $ enc_map = array ('utf8' = & gt; 'UTF-8', 'latin1' = & gt; 'Windows-1252' // etc); mb_regex_encoding ($ enc_map [mysql_client_encoding ()]); $ Table_safe = '`' .mb_ereg_replace ('`', '``, $ table).' `'; $ Id_field_safe = '`' .mb_ereg_replace ('`', '``, $ id_field).' `'; $ id_value_safe = mysql_real_escape_string ($ id_value); // Column column name $ fields = array (); $ qry = mysql_query ("Show saved COLUMNS from table table"); While ($ line = mysql_fetch_assoc ($ qry)) ($ line ['field'] = $ id_field) $ field [] = '`' .mb_ereg_replace ('`', '`', $ row ['field]'] ). ' ''; $ Fields_safe = implode (',', $ fields); // record mysql_query copy ("$ table_safe ($ fields_safe) inserting $ fields_safe selection from $ table_safe ou $ id_field_safe = '$ id_value_safe'"); // returns the new id mysql_insert_id (); }   
 Note that the ancient ext / mysql extension has been deprecated and its use in the new code has been frustrating over the years. You should consider switching  seriously  to either.

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