PDOStatement
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PDOStatement::bindColumn

(PHP 5 >= 5.1.0, PECL pdo >= 0.1.0)

PDOStatement::bindColumn Bind a column to a PHP variable

说明

bool PDOStatement::bindColumn ( mixed $column , mixed &$param [, int $type [, int $maxlen [, mixed $driverdata ]]] )

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.

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 large object OID will be returned as an integer.

参数

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.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE.

范例

Example #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);
?>

以上例程会输出:

apple   red     150
banana  yellow  175
kiwi    green   75
orange  orange  150
mango   red     200
strawberry      red     25

参见


PDOStatement
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PHP手册
PHP手册 - N: Bind a column to a PHP variable

用户评论:

daniel dot baulig at gmx dot de (18-Jun-2010 07:54)

Pleas note the following:

If you try binding a column name, that is not existent in the result set referenced by your PDOStatement there will be a warning issued regardless of your PDO ATTR_ERRMODE setting. You can supress that warning using the @ supression operator, but there is no other way of finding out if an column you try to bind actually exist other than inspecting error_get_last( ) and it's fellow companions.

Also refer to this bug report http://bugs.php.net/bug.php?id=52104