PDO::exec

(PHP 5 >= 5.1.0, PHP 7, PECL pdo >= 0.1.0)

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

설명

public int PDO::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().

인수

statement

The SQL statement to prepare and execute.

Data inside the query should be properly escaped.

반환값

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.

Warning

이 함수는 논리 FALSE를 반환하지만, 논리 FALSE로 취급할 수 있는 다른 값을 반환할 수 있습니다. 자세한 정보는 논리형 섹션을 참고하십시오. 이 함수의 반환값을 확인하려면 === 연산자를 이용하십시오.

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
$db
->exec() or die(print_r($db->errorInfo(), true));
?>

예제

Example #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("Deleted $count rows.\n");
?>

위 예제의 출력:

Deleted 1 rows.

참고

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User Contributed Notes 6 notes

up
36
david at acz dot org
16 years ago
This function cannot be used with any queries that return results.  This includes SELECT, OPTIMIZE TABLE, etc.
up
14
soletan at toxa dot de
16 years ago
It's worth noting here, that - in addition to the hints given in docs up there - using prepare, bind and execute provides more benefits than multiply querying a statement: performance and security!

If you insert some binary data (e.g. image file) into database using INSERT INTO ... then it may boost performance of parsing your statement since it is kept small (a few bytes, only, while the image may be several MiBytes) and there is no need to escape/quote the file's binary data to become a proper string value.

And, finally and for example, if you want to get a more secure PHP application which isn't affectable by SQL injection attacks you _have to_ consider using prepare/execute on every statement containing data (like INSERTs or SELECTs with WHERE-clauses). Separating the statement code from related data using prepare, bind and execute is best method - fast and secure! You don't even need to escape/quote/format-check any data.
up
5
calin at NOSPAM dot softped dot com
6 years ago
PDO::eval() might return `false` for some statements (e.g. CREATE TABLE) even if the operation completed successfully, when using PDO_DBLIB and FreeTDS. So it is not a reliable way of testing the op status.

PDO::errorInfo() can be used to test the SQLSTATE error code for '00000' (success) and '01000' (success with warning).

<?php
function execute(PDO $conn, $sql) {
   
$affected = $conn->exec($sql);
    if (
$affected === false) {
       
$err = $conn->errorInfo();
        if (
$err[0] === '00000' || $err[0] === '01000') {
            return
true;
        }
    }
    return
$affected;
}
?>

PDO::errorInfo(): http://php.net/manual/en/pdo.errorinfo.php
List of SQLSTATE Codes: http://www-01.ibm.com/support/knowledgecenter/SSGU8G_11.70.0/com.ibm.sqls.doc/ids_sqs_0809.htm
up
4
roberto at spadim dot com dot br
15 years ago
this function don't execute multi_query
to get it see SQLITE_EXEC comments there is an pereg function that get all queries and execute all then an return the last one
up
-11
hungry dot rahly at gmail dot com
11 years ago
For those that want an exec that handles params like prepare/execute does.  You can simulate this with another function

<?php
class Real_PDO extends PDO {
  public function
execParams($sql, $params) {
   
$stm = $this->prepare($sql);
   
$result = false;
    if(
$stm && $stm->execute($params) ) {
     
$result = $stm->rowCount();
      while(
$stm->fetch(PDO::FETCH_ASSOC) ) {
      }
    }
    return
$result;
  }
}
?>

Remember though, if you are doing a lot of inserts, you'll want to do it the manual way, as the prepare statement will speed up when doing multiple executes(inserts).  I use this so I can place all my SQL statements in one place, and have auto safe quoting against sql-injections.

If you are wondering about the fetch after, remember some databases can return data SELECT-like data from REMOVE/INSERTS.  In the case of PostgreSQL, you can have it return you all records that were actually removed, or have the insert return the records after the insert/post field functions, and io trigger fire, to give you normalized data.

<?php
define
("BLAH_INSERT", "INSERT INTO blah (id,data) VALUES(?,?)");
$pdo = new Real_PDO("connect string");
$data = array("1", "2");
$pdo->execParams(BLAH_INSERT, $data);
?>
up
-14
blah at whatevr dot com
15 years ago
You can't use it not only with SELECT statement, but any statement that might return rows. "OPTIMIZE table" is such example (returns some rows with optimization status).

If you do, PDO will lock-up with the "Cannot execute queries while other unbuffered queries are active." nonsense.
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