PHP 手冊
前一頁 |  | 下一頁

# PDO::exec

(no version information, might be only in CVS)

PDO::exec -- Execute an SQL statement and return the number of affected rows

## Description

long PDO::exec ( string statement )

警告
這個函數是實驗性質的。這個函數的行為、名稱、和關於此函數的任何其他文件在未來PHP的發行中可能會在不通知的情況下改變。 使用此延伸需自行承擔風險。

PDO::exec() prepares and 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 SELECT statement that you need to issue multiple times, prepare a PDOStatement object with PDO::prepare() and issue the statement with PDOStatement::execute().

## Parameters

statement

  The SQL statement to prepare and execute.

## Return Values

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.

## 範例

範例 1. Issuing a DELETE statement

Count the number of rows deleted by a DELETE statement with no WHERE clause.

`<?php $dbh = new PDO('odbc:sample', 'db2inst1', 'ibmdb2'); /* Delete all rows from the FRUIT table */ $count = $dbh->exec("DELETE FROM fruit WHERE colour = 'red'"); /* Return number of rows that were deleted */ print("Return number of rows that were deleted:\n"); print("Deleted $count rows.\n"); ?>`

The above example will output:

    Return number of rows that were deleted:
    Deleted 1 rows.

## 參考

PDO::prepare()
PDO::query()
PDOStatement::execute()

前一頁 | 內容 | 下一頁
PDO::errorInfo | 上一層 | PDO::getAttribute