name of the sequence
when TRUE the sequence is automatic created, if it not exists.
resource - a free id or a MDB_Error, if fail
Table 39-1. Possible PEAR_Error values
|Error code||Error message||Reason||Solution|
|MDB_ERROR_NOT_CAPABLE||NULL||Function is not supported by the database backend||Switch to another database system, if you really need this feature.|
|MDB_ERROR_NOT_LOCKED||NULL||Locking of sequence table fails||Database specific, check documention of your database,|
|MDB_ERROR_NOSUCHTABLE||NULL||Sequence table was not found||Try to create a new sequence or if you are sure, a sequence was already create, check database integrity|