PDO::query

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

PDO::query Executes an SQL statement, returning a result set as a PDOStatement object

Descrição

public PDO::query ( string $statement ) : PDOStatement
public PDO::query ( string $statement , int $fetch_style = PDO::FETCH_COLUMN , int $colno ) : PDOStatement
public PDO::query ( string $statement , int $fetch_style = PDO::FETCH_CLASS , string $classname , array $ctorargs ) : PDOStatement
public PDO::query ( string $statement , int $fetch_style = PDO::FETCH_INTO , object $object ) : PDOStatement

PDO::query() executes an SQL statement in a single function call, returning the result set (if any) returned by the statement as a PDOStatement object.

For a query that you need to issue multiple times, you will realize better performance if you prepare a PDOStatement object using PDO::prepare() and issue the statement with multiple calls to PDOStatement::execute().

If you do not fetch all of the data in a result set before issuing your next call to PDO::query(), your call may fail. Call PDOStatement::closeCursor() to release the database resources associated with the PDOStatement object before issuing your next call to PDO::query().

Nota:

If more than one argument is passed to this function, the remaining arguments will be treated as though you called PDOStatement::setFetchMode() on the resultant statement object.

Parâmetros

statement

The SQL statement to prepare and execute.

Data inside the query should be properly escaped.

Valor Retornado

PDO::query() returns a PDOStatement object, or FALSE on failure.

Exemplos

Exemplo #1 Demonstrate PDO::query

A nice feature of PDO::query() is that it enables you to iterate over the rowset returned by a successfully executed SELECT statement.

<?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";
}
?>

O exemplo acima irá imprimir:

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

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