Manuál PHP | ||
---|---|---|
PÅ™edcházejÃcà | Dalšà |
PDO->exec()
(no version information, might be only in CVS)
PDO->exec() -- Execute an SQL statement and return the number of affected rowsPopis
class PDO {int exec ( string statement )
}
PDO->exec() executes an SQL statement in a single function call, returning the number of rows affected by the statement.
PDO->exec() does not return results from a SELECT statement. For a SELECT statement that you only need to issue once during your program, consider issuing PDO->query(). For a statement that you need to issue multiple times, prepare a PDOStatement object with PDO->prepare() and issue the statement with PDOStatement->execute().
Návratové hodnoty
PDO->exec() returns the number of rows that were modified or deleted by the SQL statement you issued. If no rows were affected, PDO->exec() returns 0.
Varovánà |
Tato funkce může vracet booleovskou hodnotu FALSE, ale také nebooleovskou hodnotu odpovÃdajÃcà ohodnocenà FALSE, napÅ™Ãklad 0 nebo "". ÄŒtÄ›te prosÃm sekci o typu Boolean, kde najdete vÃce informacÃ. Pro testovánà návratové hodnoty této funkce použijte operátor ===. |
The following example incorrectly relies on the return value of PDO->exec(), wherein a statement that affected 0 rows results in a call to die():
<?php |
PÅ™Ãklady
PÅ™edcházejÃcà | Domů | Dalšà |
PDO->errorInfo() | Nahoru |