silverstripe-framework/ORM/Queries/SQLWriteExpression.php

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<?php
namespace SilverStripe\ORM\Queries;
/**
* Represents a SQL expression which may have field values assigned
* (UPDATE/INSERT Expressions)
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*
* @package framework
* @subpackage orm
*/
interface SQLWriteExpression {
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/**
* Adds assignments for a list of several fields.
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*
* For multi-row objects this applies this to the current row.
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*
* Note that field values must not be escaped, as these will be internally
* parameterised by the database engine.
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*
* <code>
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*
* // Basic assignments
* $query->addAssignments(array(
* '"Object"."Title"' => 'Bob',
* '"Object"."Description"' => 'Bob was here'
* ))
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*
* // Parameterised assignments
* $query->addAssignments(array(
* '"Object"."Title"' => array('?' => 'Bob')),
* '"Object"."Description"' => array('?' => null))
* ))
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*
* // Complex parameters
* $query->addAssignments(array(
* '"Object"."Score"' => array('MAX(?,?)' => array(1, 3))
* ));
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*
* // Assigment of literal SQL for a field. The empty array is
* // important to denote the zero-number paramater list
* $query->addAssignments(array(
* '"Object"."Score"' => array('NOW()' => array())
* ));
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*
* </code>
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*
* @param array $assignments The list of fields to assign
* @return self Self reference
*/
public function addAssignments(array $assignments);
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/**
* Sets the list of assignments to the given list
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*
* For multi-row objects this applies this to the current row.
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*
* @see SQLWriteExpression::addAssignments() for syntax examples
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*
* @param array $assignments
* @return self Self reference
*/
public function setAssignments(array $assignments);
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/**
* Retrieves the list of assignments in parameterised format
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*
* For multi-row objects returns assignments for the current row.
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*
* @return array List of assigments. The key of this array will be the
* column to assign, and the value a parameterised array in the format
* array('SQL' => array(parameters));
*/
public function getAssignments();
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/**
* Set the value for a single field
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*
* For multi-row objects this applies this to the current row.
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*
* E.g.
* <code>
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*
* // Literal assignment
* $query->assign('"Object"."Description"', 'lorum ipsum'));
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*
* // Single parameter
* $query->assign('"Object"."Title"', array('?' => 'Bob'));
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*
* // Complex parameters
* $query->assign('"Object"."Score"', array('MAX(?,?)' => array(1, 3));
* </code>
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*
* @param string $field The field name to update
* @param mixed $value The value to assign to this field. This could be an
* array containing a parameterised SQL query of any number of parameters,
* or a single literal value.
* @return self Self reference
*/
public function assign($field, $value);
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/**
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* Assigns a value to a field using the literal SQL expression, rather than
* a value to be escaped
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*
* For multi-row objects this applies this to the current row.
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*
* @param string $field The field name to update
* @param string $sql The SQL to use for this update. E.g. "NOW()"
* @return self Self reference
*/
public function assignSQL($field, $sql);
}