PDO::query
(no version information, might be only in CVS)
PDO::query --
Executes an SQL statement, returning a result set as a PDOStatement object
Description
PDOStatement
PDO::query ( string statement )
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().
Parameters
- statement
The SQL statement to prepare and execute.
Return Values
PDO::query() returns a PDOStatement object.
Examples
Example 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
function getFruit($conn) {
$sql = 'SELECT name, colour, calories FROM fruit ORDER BY name';
foreach ($conn->query($sql) as $row) {
print $row['NAME'] . "\t";
print $row['COLOUR'] . "\t";
print $row['CALORIES'] . "\n";
}
}
?>
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The above example will output: 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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See Also
| PDO::exec() |
| PDO::prepare() |
| PDOStatement::execute() |