PDOStatement::bindParam

Manuale PHP
Indietro		Avanti

Descrizione

bool PDOStatement::bindParam ( mixed parameter, mixed &variable [, int data_type [, int length]] )

Avvertimento

Questa funzione è SPERIMENTALE. Ovvero, il comportamento di questa funzione, il nome di questa funzione, in definitiva tutto ciò che è documentato qui può cambiare nei futuri rilasci del PHP senza preavviso. Siete avvisati, l'uso di questa funzione è a vostro rischio.

Binds an SQL statement parameter to the specified variable name. The SQL statement parameter can either be a named placeholder or a question mark placeholder.

Output parameters will set the value of the bound PHP variable to the value returned by the database when the SQL statement is executed. This enables you to call stored procedures with output or input/output parameters, for example, for databases that support such features.

For input-only variables, you can pass an array of input values to PDOStatement::execute() instead.

Elenco dei parametri

parameter: Parameter identifier. For a prepared statement using named placeholders, this will be a parameter name of the form :name. For a prepared statement using question mark placeholders, this will be the 1-indexed position of the parameter.
variable: Name of the PHP variable to bind to the SQL statement parameter.
data_type: Explicit data type for the parameter using the PDO_PARAM_* constants. To return an INOUT parameter from a stored procedure, use the bitwise OR operator to set the PDO_PARAM_INPUT_OUTPUT bits for the data_type parameter.
length: Length of the data type. To indicate that a parameter is an OUT parameter from a stored procedure, you must explicitly set the length.

Esempi

Esempio 1. Execute a prepared statement with named placeholders


<?php
/* Execute a prepared statement by binding PHP variables */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
    FROM fruit
    WHERE calories < :calories AND colour = :colour');
$sth->bindParam(':calories', $calories, PDO_PARAM_INT);
$sth->bindParam(':colour', $colour, PDO_PARAM_STR, 12);
$sth->execute();
?>

Esempio 2. Execute a prepared statement with question mark placeholders


<?php
/* Execute a prepared statement by binding PHP variables */
$calories = 150;
$colour = 'red';
$sth = $dbh->prepare('SELECT name, colour, calories
    FROM fruit
    WHERE calories < ? AND colour = ?');
$sth->bindParam(1, $calories, PDO_PARAM_INT);
$sth->bindParam(2, $colour, PDO_PARAM_STR, 12);
$sth->execute();
?>

Esempio 3. Call a stored procedure with an INOUT parameter


<?php
/* Call a stored procedure with an INOUT parameter */
$colour = 'red';
$sth = $dbh->prepare('CALL puree_fruit(?)');
$sth->bindParam(1, $colour, PDO_PARAM_STR|PDO_PARAM_INPUT_OUTPUT, 12);
$sth->execute();
print("After pureeing fruit, the colour is: $colour");
?>

Indietro	Partenza	Avanti
PDOStatement::bindColumn	Risali	PDOStatement::columnCount

PDOStatement::bindParam

Descrizione

Elenco dei parametri

Esempi

Vedere anche: