Class ExpressionFilterAttribute

Data object plain SQL expression filter attribute

Inheritance
Object
Attribute
FilterBaseAttribute
FilterAttribute
ExpressionFilterAttribute
Inherited Members
Namespace: XData.Mapping
Assembly: XData.docfx.dll
Syntax
[AttributeUsage(AttributeTargets.Class, AllowMultiple = true)]
public sealed class ExpressionFilterAttribute : FilterAttribute
Remarks

Used to filter data by field comparison to plain SQL expression (for example: some_field = substr(other_field, 1, 2))

Hint: Filter field can be represented as expression two by ColumnExpressionAttribute or PropertyExpressionAttribute

WARNING! Sql expressions can use specific Sql dialect features! Data mapping may be not compatible with other database engines!

Constructors

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ExpressionFilterAttribute(String, String, String)

Expression filter attribute

Declaration
public ExpressionFilterAttribute(string source, string fieldName, string exprText)
Parameters
Type Name Description
String source

Primary source alias
String fieldName

Primary field name
String exprText

SQL expression text
Exceptions
Type Condition
XDataRuntimeException

SQL expression cannot be null or empty string

Properties

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ExprText

SQL expression

Declaration
public string ExprText { get; }
Property Value
Type Description
String
Remarks

WARNING! SQL expressions can use specific SQL dialect features! Data mapping may be not compatible with other database engines!

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FilterType

Filter type

Declaration
public override FilterType FilterType { get; }
Property Value
Type Description
FilterType Expression
Overrides
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TypeId

When implemented in a derived class, gets a unique identifier for this Attribute.

Declaration
public override object TypeId { get; }
Property Value
Type Description
Object

An Object that is a unique identifier for the attribute.
Overrides

Extension Methods