Class ColumnExpressionAttribute

Column expression attribute

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

Used when ColumnAttribute value is expression (PlainSql or SubQuery) according ExprType

Constructors

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ColumnExpressionAttribute(String, String, DataExpressionType, DbType)

Column expression attribute

Declaration
public ColumnExpressionAttribute(string propertyName, string exprText, DataExpressionType exprType = DataExpressionType.PlainSql, DbType type = DbType.String)
Parameters
Type Name Description
String propertyName

Property name
String exprText

Expression text
DataExpressionType exprType

Expression type
DbType type

Expression DbType
Exceptions
Type Condition
XDataRuntimeException

Property name cannot be null or empty string
XDataRuntimeException

Expression text cannot be null or empty string

Properties

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DbType

Expression DbType

Declaration
public DbType DbType { get; }
Property Value
Type Description
DbType
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Exists

Exists subquery operation

Declaration
public ExistsOperation Exists { get; set; }
Property Value
Type Description
ExistsOperation
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ExprScale

Expression scale

Declaration
public int ExprScale { get; set; }
Property Value
Type Description
Int32
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ExprSize

Expression size

Declaration
public int ExprSize { get; set; }
Property Value
Type Description
Int32
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ExprText

Expression text

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

PlainSql expression text is Sql expression or SqlExpressionAttribute name

SubQuery expression text is Alias

WARNING! Plain Sql expressions (see ExprType) can use specific Sql dialect features! Data mapping may be not compatible with other database engines! Use SqlExpressionAttribute instead.

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ExprType

Expression type

Declaration
public DataExpressionType ExprType { get; }
Property Value
Type Description
DataExpressionType
Remarks

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

See Also
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PropertyName

Property name

Declaration
public string PropertyName { get; }
Property Value
Type Description
String
See Also
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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