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PDO::query

(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.2.0)

PDO::query 预处理并执行没有占位符的 SQL 语句

说明

public PDO::query(string $query, ?int $fetchMode = null): PDOStatement|false
public PDO::query(string $query, ?int $fetchMode = PDO::FETCH_COLUMN, int $colno): PDOStatement|false
public PDO::query(
    string $query,
    ?int $fetchMode = PDO::FETCH_CLASS,
    string $classname,
    array $constructorArgs
): PDOStatement|false
public PDO::query(string $query, ?int $fetchMode = PDO::FETCH_INTO, object $object): PDOStatement|false

PDO::query() 在单次函数调用内预处理并执行 SQL 语句,以 PDOStatement 对象形式返回结果集(如果有数据的话)。

如果反复调用同一个查询,用 PDO::prepare() 准备 PDOStatement 对象,并用 PDOStatement::execute() 执行语句,将具有更好的性能。

如果没有完整获取结果集内的数据,就调用下一个 PDO::query(),将可能调用失败。应当在执行下一个 PDO::query() 前,先用 PDOStatement::closeCursor() 释放数据库 PDOStatement 关联的资源。

注意:

如果 query 包含占位符,则必须使用 PDO::prepare()PDOStatement::execute() 方法分别预处理和执行语句。

参数

query

预处理和执行的 SQL 语句。

如果 SQL 包含占位符,则必须使用 PDO::prepare()PDOStatement::execute()。或者在调用 PDO::query() 之前手动预处理 SQL,如果驱动程序支持,使用 PDO::quote() 正确格式化数据。

fetchMode

返回 PDOStatement 的默认获取模式。必须是 PDO::FETCH_* 常量之一。

If this argument is passed to the function, the remaining arguments will be treated as though PDOStatement::setFetchMode() was called on the resultant statement object. The subsequent arguments vary depending on the selected fetch mode.

返回值

返回 PDOStatement 对象 或者在失败时返回 false

错误/异常

如果属性 PDO::ATTR_ERRMODE 设置为 PDO::ERRMODE_WARNING,则发出级别为 E_WARNING 的错误。

如果属性 PDO::ATTR_ERRMODE 设置为 PDO::ERRMODE_EXCEPTION,则抛出 PDOException

示例

示例 #1 没有占位符的 SQL 可以使用 PDO::query() 执行

<?php
$sql
= 'SELECT name, color, calories FROM fruit ORDER BY name';
foreach (
$conn->query($sql) as $row) {
print
$row['name'] . "\t";
print
$row['color'] . "\t";
print
$row['calories'] . "\n";
}
?>

以上示例会输出:

apple   red     150
banana  yellow  250
kiwi    brown   75
lemon   yellow  25
orange  orange  300
pear    green   150
watermelon      pink    90

参见

add a note

User Contributed Notes 6 notes

up
42
fredrik at NOSPAM dot rambris dot com
16 years ago
The handling of errors by this function is controlled by the attribute PDO::ATTR_ERRMODE.

Use the following to make it throw an exception:
<?php
$dbh
->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
?>
up
2
Ilyas Bakirov
2 years ago
I would like to mention fetching rows from SQL query using PDO:

<?php

$dbh
= new PDO('mysql:host=localhost;dbname=test', $user, $pass);

// use the connection here
$sth = $dbh->query('SELECT * FROM countries');

// fetch all rows into array, by default PDO::FETCH_BOTH is used
$rows = $stm->fetchAll();

// iterate over array by index and by name
foreach($rows as $row) {

printf("$row[0] $row[1] $row[2]\n");
printf("$row['id'] $row['name'] $row['population']\n");

}
?>
up
3
stefano[dot]bertoli [at] gmail[dot]com
9 years ago
Trying to pass like second argument PDO::FETCH_ASSOC it still work.

So passing FETCH TYPE like argument seems work.

This save you from something like:

<?php
$result
= $stmt->setFetchMode(PDO::FETCH_NUM);
?>

Example:
<?php
$res
= $db->query('SELECT * FROM `mytable` WHERE true', PDO::FETCH_ASSOC);

?>
up
1
JJimenez
4 months ago
When you make a wraper for PDO:query, you must define the method like this:

public function query( string $sql, ?int $fetchMode = null, mixed ...$fetchModeArgs) : \PDOStatement|false

if you delete one of the parameters or use one of the oficials parameters you get a Fatal error
up
1
dozoyousan at gmail dot com
17 years ago
> When query() fails, the boolean false is returned.

I think that is "Silent Mode".
If that set attribute ErrorMode "Exception Mode"
then that throw PDOException.
$pdoObj = new PDO( $dsn, $user, $pass );
$pdoObj->setAttribute("PDO::ATTR_ERRMODE", PDO::ERRMODE_EXCEPTION);
up
-1
marcos at marcosregis dot com
15 years ago
After a lot of hours working with DataLink on Oracle->MySQL and PDO we (me and Adriano Rodrigues, that solve it) discover that PDO (and oci too) need the attribute AUTOCOMMIT set to FALSE to work correctly with.
There's 3 ways to set autocommit to false: On constructor, setting the atribute after construct and before query data or initiating a Transaction (that turns off autocommit mode)

The examples:
<?php
// First way - On PDO Constructor
$options = array(PDO::ATTR_AUTOCOMMIT=>FALSE);

$pdo = new PDO($dsn,$user,$pass,$options);

// now we are ready to query DataLinks

?>

<?php
// Second Way - Before create statements
$pdo = new PDO($dsn,$user,$pass);

$pdo->setAttribute(PDO::ATTR_AUTOCOMMIT,FALSE);
// or
$pdo->beginTransaction();

// now we are ready to query DataLinks
?>

To use DataLinks on oci just use OCI_DEFAULT on oci_execute() function;
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