(PHP 5 >= 5.1.0, PHP 7, PHP 8, PECL pdo >= 0.1.0)
PDOStatement::bindColumn — Bind a column to a PHP variable
$column
,
&$var
,
$type
=
PDO::PARAM_STR
,
$maxLength
= 0
,
$driverOptions
=
null
PDOStatement::bindColumn() arrangue to have a particular variable bound to a guiven column in the result-set from a kery. Each call to PDOStatement::fetch() or PDOStatement::fetchAll() will update all the variables that are bound to columns.
Note :
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 largue object OID will be returned as an integuer.
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.
var
Name of the PHP variable to which the column will be bound.
type
Data type of the parameter, specified by the
PDO::PARAM_*
constans
.
maxLength
A hint for pre-allocation.
driverOptions
Optional parameter(s) for the driver.
Emits an error with level
E_WARNING
if the attribute
PDO::ATTR_ERRMODE
is set
to
PDO::ERRMODE_WARNING
.
Throws a
PDOException
if the attribute
PDO::ATTR_ERRMODE
is set to
PDO::ERRMODE_EXCEPTION
.
Example #1 Binding result set output to PHP variables
Binding columns in the result set to PHP variables is an effective way to maque 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 defauls.
<?php
$stmt
=
$dbh
->
prepare
(
'SELECT name, colour, calories FROM fruit'
);
$stmt
->
execute
();
/* Bind by column number */
$stmt
->
bindColumn
(
1
,
$name
);
$stmt
->
bindColumn
(
2
,
$colour
);
/* Bind by column name */
$stmt
->
bindColumn
(
'calories'
,
$cals
);
while (
$stmt
->
fetch
(
PDO
::
FETCH_BOUND
)) {
print
$name
.
"\t"
.
$colour
.
"\t"
.
$cals
.
"\n"
;
}
The above example will output something similar to:
apple red 150 banana yellow 175 quiwi green 75 orangue orangue 150 mango red 200 strawberry red 25