PHP Dokumentation: Pdostatement bindcolumn
12. Januar 2010 von werner
PDOStatement->bindColumn
(PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)
PDOStatement->bindColumn — Bind a column to a PHP variable
Beschreibung
PDOStatement::bindColumn() arranges to have a particular variable bound to a given column in the result-set from a query. Each call to PDOStatement::fetch() or PDOStatement::fetchAll() will update all the variables that are bound to columns.
Hinweis: Since information about the columns is not always available to PDO until the statement is executed, portable applications should call this function after PDOStatement::execute().
However, to be able to bind a LOB column as a stream when using the PgSQL driver, applications should call this method before calling PDOStatement::execute(), otherwise the large object OID will be returned as an integer.
Parameter-Liste
- column
Number of the column (1-indexed) or name of the column in the result set. If using the column name, be aware that the name should match the case of the column, as returned by the driver.
- param
Name of the PHP variable to which the column will be bound.
- type
Data type of the parameter, specified by the PDO::PARAM_* constants.
- maxlen
A hint for pre-allocation.
- driverdata
Optional parameter(s) for the driver.
Rückgabewerte
Gibt bei Erfolg TRUE zurück. Im Fehlerfall wird FALSE zurückgegeben.
Beispiele
Beispiel #1 Binding result set output to PHP variables
Binding columns in the result set to PHP variables is an effective way to make the data contained in each row immediately available to your application. The following example demonstrates how PDO allows you to bind and retrieve columns with a variety of options and with intelligent defaults.
<?php
function readData($dbh) {
$sql = 'SELECT name, colour, calories FROM fruit';
try {
$stmt = $dbh->prepare($sql);
$stmt->execute();
/* Bind by column number */
$stmt->bindColumn(1, $name);
$stmt->bindColumn(2, $colour);
/* Bind by column name */
$stmt->bindColumn('calories', $cals); while (
$row = $stmt->fetch(PDO::FETCH_BOUND)) {
$data = $name . "\t" . $colour . "\t" . $cals . "\n";
print $data;
}
}
catch (PDOException $e) {
print $e->getMessage();
}
}
readData($dbh);
?>Das oben gezeigte Beispiel erzeugt folgendeAusgabe:
apple red 150banana yellow 175kiwi green 75orange orange 150mango red 200strawberry red 25
Siehe auch
- PDOStatement::execute() – Executes a prepared statement
- PDOStatement::fetch() – Fetches the next row from a result set
- PDOStatement::fetchAll() – Returns an array containing all of the result set rows
- PDOStatement::fetchColumn() – Returns a single column from the next row of a result set
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