php - Duplicate Data for Primary Key -

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I have a table that saves an id for the user that ID's data is found with LDAP for the first time when user logs In this, he records his identity in the table. But the users who consider me on this already have data on the database. I got the error 'duplicate entry' jodida for 'primary'. Field Since this data is the primary key but I need to go around it. 

  $ check = "Choose from utilities * where id = '$ samaccountname [0]'"; $ H = mysql_query ($ check); If (! $ H) {dead (mysql_error ()); } $ Data = mysql_fetch_array ($ h); If ($ data [0]> 1) {header ('location: pprincipal.php'); } And {$ query = mysql_query ("Use utility (id) values ​​('$ samaccountname [0]');"); If (! $ Query) {dead (mysql_error ()); }}

I do not want to duplicate data, I just want to know whether the data has been entered or not, and if so, then go ahead, if it is not, then data Enter / P>

Note: $ samaccountname is a variable that contains data from the LDAP

basics - the user logs for the first time and it includes data on the database. Second time - Since the area is the primary key, it will fail, the user should be inserted data on the database to proceed to the main page (pprincipal.php).

Thank you in advance.

use mysql_num_rows function in if condition. 

  if (mysql_num_rows ($ H)) {header ('location: pprincipal.php'); } And {$ query = mysql_query ("Use utility (id) values ​​('$ samaccountname [0]');"); If (! $ Query) {dead (mysql_error ()); }}

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