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Adds an expression to the list of "fields" to be SELECTed.

An expression can be any arbitrary string that is valid SQL. That includes various functions, which may in some cases be database-dependent. This method makes no effort to correct for database-specific functions.

Übergabeparameter

$expression The expression string. May contain placeholders.

$alias The alias for this expression. If not specified, one will be generated automatically in the form "expression_#". The alias will be checked for uniqueness, so the requested alias may not be the alias that is assigned in all cases.

$arguments Any placeholder arguments needed for this expression.

Rückgabewert

The unique alias that was assigned for this expression.

Verwandte Themen

Database abstraction layer

Allow the use of different database servers using the same code base.

Code

includes/database/select.inc, line 195

<?php
public function addExpression($expression, $alias = NULL, $arguments = array());
?>