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() 和 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() 和 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

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    用户贡献的备注 6 notes

    up
    42
    fredrik at NOSPAM dot rambris dot com
    17 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
    0
    JJimenez
    1 year 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
    stefano[dot]bertoli [at] gmail[dot]com
    10 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
    0
    marcos at marcosregis dot com
    16 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;
    up
    -3
    Ilyas Bakirov
    3 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
    -2
    dozoyousan at gmail dot com
    18 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);
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