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ISqlExpressionFactory.Coalesce Metoda

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Definice

Obor názvů:
Microsoft.EntityFrameworkCore.Query
Sestavení:
Microsoft.EntityFrameworkCore.Relational.dll
Balíček:
Microsoft.EntityFrameworkCore.Relational v3.0.0
Balíček:
Microsoft.EntityFrameworkCore.Relational v3.1.0
Balíček:
Microsoft.EntityFrameworkCore.Relational v5.0.0
Balíček:
Microsoft.EntityFrameworkCore.Relational v6.0.0
Balíček:
Microsoft.EntityFrameworkCore.Relational v7.0.0
Balíček:
Microsoft.EntityFrameworkCore.Relational v8.0.0

Vytvoří, SqlFunctionExpression který představuje operaci COALESCE.

public Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlBinaryExpression Coalesce (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression left, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression right, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping typeMapping = default);
public Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression Coalesce (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression left, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression right, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping typeMapping = default);
public Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression Coalesce (Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression left, Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression right, Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping? typeMapping = default);
abstract member Coalesce : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlBinaryExpression
abstract member Coalesce : Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlExpression * Microsoft.EntityFrameworkCore.Storage.RelationalTypeMapping -> Microsoft.EntityFrameworkCore.Query.SqlExpressions.SqlFunctionExpression
Public Function Coalesce (left As SqlExpression, right As SqlExpression, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlBinaryExpression
Public Function Coalesce (left As SqlExpression, right As SqlExpression, Optional typeMapping As RelationalTypeMapping = Nothing) As SqlFunctionExpression

Parametry

left
SqlExpression

Levý operand.

right
SqlExpression

Pravý operand.

typeMapping
RelationalTypeMapping

Mapování typu, které se přiřadí vytvořenému výrazu.

Návraty

SqlBinaryExpression
SqlFunctionExpression

Výraz představující operaci SQL COALESCE.

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