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