Class Atk4\Data\Field\SqlExpressionField

`extends`	`Field`
`uses`	`InitializerTrait`

Atk4\Data\Field implements Expressionable uses DiContainerTrait, FieldPropertiesTrait, JoinLinkTrait, ReadableCaptionTrait, TrackableTrait
- Atk4\Data\Field\SqlExpressionField uses InitializerTrait

Located at data/src/Field/SqlExpressionField.php

Methods
`public`	`useAlias(): bool` Should this field use alias? Should this field use alias? Overrides `Atk4\Data\Field::useAlias()`	#
`public`	`getDsqlExpression(Expression $expression): Expression` When field is used as expression, this method will be called. When field is used as expression, this method will be called. Off-load implementation into persistence. Overrides `Atk4\Data\Field::getDsqlExpression()`	#

Methods inherited from Atk4\Data\Field
`__construct(), setOwner(), setDefaults(), onHookToOwnerEntity(), normalize(), get(), set(), setNull(), compare(), hasReference(), getReference(), getPersistenceName(), getQueryArguments(), isEditable(), isVisible(), isHidden(), getCaption(), __debugInfo(), getOwner()`

Methods used from Atk4\Core\DiContainerTrait
`setMissingProperty(), assertInstanceOf(), _fromSeedPrecheck(), fromSeed(), fromSeedUnsafe()`

Methods used from Atk4\Data\Model\JoinLinkTrait
`hasJoin(), getJoin()`

Methods used from Atk4\Core\ReadableCaptionTrait
`readableCaption()`

Methods used from Atk4\Core\TrackableTrait
`issetOwner(), unsetOwner(), getDesiredName(), destroy()`

Methods used from Atk4\Core\InitializerTrait
`init(), isInitialized(), assertIsInitialized(), invokeInit()`

Properties
`public`	`bool`	`$neverSave = true`	#
`public`	`bool`	`$readOnly = true`	#
`public`	`(Closure(object, Expression): (string\|Expressionable))\|string\|Expressionable`	`$expr` Used expression. Used expression.	#
`public`	`string`	`$aggregate` Specifies how to aggregate this. Specifies how to aggregate this.	#
`public`	`string`	`$concatSeparator`	#
`public`	`HasMany\|null`	`$aggregateRelation` When defining as aggregate, this will point to relation object. When defining as aggregate, this will point to relation object.	#
`public`	`string`	`$field` Specifies which field to use. Specifies which field to use.	#

Properties used from Atk4\Data\Model\FieldPropertiesTrait
`$actual, $neverPersist, $type, $nullable, $required, $enum, $values, $referenceLink, $system, $default, $caption, $ui`

Properties used from Atk4\Data\Model\JoinLinkTrait
`$joinName`

Properties used from Atk4\Core\TrackableTrait
`$_owner, $shortName`

Properties used from Atk4\Core\InitializerTrait
`$_initialized`