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IPredicate Interface

Interface for a predicate. Predicates are expressions which result in true or false, and which are used in WHERE clauses. Generic

Namespace:  SD.LLBLGen.Pro.ORMSupportClasses
Assembly:  SD.LLBLGen.Pro.ORMSupportClasses (in SD.LLBLGen.Pro.ORMSupportClasses.dll) Version: 5.8.0.0 (5.8.21.0111)
Syntax
public interface IPredicate

The IPredicate type exposes the following members.

Properties
  NameDescription
Public propertyDatabaseSpecificCreator
Object which will be used to create valid parameter objects, field names, including prefix/postfix characters, and conversion routines, and field names, including prefix/postfix characters. Uses the strategy pattern so the generic code can work with more than one target database.
Public propertyInstanceType
The PredicateType of this instance. Used to determine the instance nature without a lot of casting.
Public propertyNegate
Flag for setting the Predicate to negate itself, i.e. to add 'NOT' to its result.
Public propertyObjectAlias
Alias for the object the field belongs to. Used to identify which entity to use when the entity is present multiple times in a relation collection. Alias has to match an alias specified in the relation collection or should be left empty if no alias is specified (or no relation collection is used).
Public propertyParameters
The list of parameters created when the Predicate was translated to text usable in a query. Only valid after a succesful call to ToQueryText
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Methods
  NameDescription
Public methodGetFrameworkElementsInPredicate
Gets a list of all framework objects (fields, expression objects etc.) which are located in this IPredicate instance. E.g. a FieldCompareValuePredicate will return a list with 1 IEntityFieldCore instance: the field to compare. If no framework elements are present in the predicate, the base implementation is used, which returns an empty list. This routine is used to gather information for Linq queries.
Public methodReadXml
Deserializes the predicate data on the xml reader into a predicate instance
Public methodToQueryText
Retrieves a ready to use text representation of the contained Predicate.
Public methodToQueryText(Boolean)
Retrieves a ready to use text representation of the contained Predicate.
Public methodWriteXml
Serializes the predicate as xml to the writer specified.
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Extension Methods
  NameDescription
Public Extension MethodAnd
Returns a new PredicateExpression with contents: predicate AND toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodAndNot
Returns a new PredicateExpression with contents: predicate AND NOT toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodAs
Specifies an alias for the value returned by the predicate when the predicate is used in a projection. Equal to: Functions.IIF(predicate, true, false).As(alias)
(Defined by PredicateExtensionMethods.)
Public Extension MethodAsBooleanValue
Returns the predicate wrapped in a CASE WHEN (predicate) THEN 1 ELSE 0 END construct (as a function call expression) so the predicate can be used as a real boolean value in other places than the Where clause.
(Defined by PredicateExtensionMethods.)
Public Extension MethodIsEmpty
Determines whether the specified predicate or predicate expression is empty. A null passed in is also considered empty
(Defined by ORMClassExtensions.)
Public Extension MethodOr
Returns a new PredicateExpression with contents: predicate OR toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodOrNot
Returns a new PredicateExpression with contents: predicate OR NOT toAdd
(Defined by PredicateExtensionMethods.)
Public Extension MethodToValue
Placeholder method which is used in a Select(lambda func) projection inside the lambda to specify the type of the result of the passed in predicate. Use this method only when specifying a predicate in the projection lambda.
(Defined by PredicateExtensionMethods.)
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See Also