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I need to concatenate a file id before insert, thus want to lock a reference table for read and write. How can I do that?
Just locking the table for read, still allows select from that table
$SqlLock2 = “LOCK TABLES TableName t1 READ”;
mysql_query($SqlLock2) or die(mysql_error());
// Select something from TableName
$SqlUnlock = “UNLOCK TABLES”;
mysql_query($SqlUnlock) or die(mysql_error());
READ locks are always shared locks; you must lock it for WRITE for an exclusive access (even if you only read it afterwards)