PDOStatement::bindColumn
(no version information, might be only in CVS)
PDOStatement::bindColumn --
Bind a column to a PHP variable
Descripción
bool
PDOStatement::bindColumn ( mixed column, mixed ¶m [, int type] )
Aviso |
Esta función
es EXPERIMENTAL. Esto significa que el
comportamiento de esta función, el nombre de esta
función y en definitiva TODO lo documentado sobre esta
función, puede cambiar en una futura version de PHP SIN
AVISO. La advertencia queda hecha, y utilizar esta extensión
queda bajo su propia responsabilidad. |
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.
Nota:
Since information about the columns is not always available to PDO until
the statement is executed, portable applications should call this
function after PDO::execute().
Lista de parámetros
- 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.
Ejemplos
Ejemplo 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); ?>
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El resultado del ejemplo seria: apple red 150
banana yellow 175
kiwi green 75
orange orange 150
mango red 200
strawberry red 25 |
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Ver también
PDOStatement::execute() |
PDOStatement::fetch() |
PDOStatement::fetchAll() |
PDOStatement::fetchColumn() |