Class SqlDefaultValueExpression

Namespace

LinqToDB.Internal.SqlQuery

Assembly

linq2db.dll

The default a reader substitutes for a NULL in a column that cannot be NULL as declared, read by a calculation of the projection. A provider writes it as the value, or as the least value of the column's type where the type cannot hold it.

public sealed class SqlDefaultValueExpression : SqlExpressionBase, ISqlExpression, IQueryElement, IEquatable<ISqlExpression>

Inheritance

object

QueryElement

SqlExpressionBase

SqlDefaultValueExpression

Implements

ISqlExpression

IQueryElement

IEquatable<ISqlExpression>

Inherited Members

SqlExpressionBase.Equals(ISqlExpression)

SqlExpressionBase.Equals(ISqlExpression, Func<ISqlExpression, ISqlExpression, bool>)

SqlExpressionBase.CanBeNullable(NullabilityContext)

SqlExpressionBase.Precedence

SqlExpressionBase.SystemType

QueryElement.ReferenceComparer

QueryElement.ElementType

QueryElement.ToString(QueryElementTextWriter)

QueryElement.GetElementHashCode()

QueryElement.Accept(QueryElementVisitor)

Extension Methods

QueryHelper.AnyElement(IQueryElement, Func<IQueryElement, bool>)

QueryHelper.CanBeEvaluated(IQueryElement, EvaluationContext)

QueryHelper.CanBeEvaluated(IQueryElement, bool)

QueryHelper.EvaluateBoolExpression(IQueryElement, EvaluationContext, bool?)

QueryHelper.EvaluateExpression(IQueryElement, EvaluationContext)

QueryHelper.HasElement(IQueryElement, IQueryElement)

QueryHelper.HasParameter(IQueryElement)

QueryHelper.HasQueryParameter(IQueryElement)

QueryHelper.IsMutable(IQueryElement)

QueryHelper.TryEvaluateExpression(IQueryElement, EvaluationContext, out object?)

QueryHelper.TryEvaluateExpressionForServer(IQueryElement, EvaluationContext, out object?)

QueryVisitorExtensions.Find(IQueryElement?, QueryElementType)

QueryVisitorExtensions.Find(IQueryElement?, Func<IQueryElement, bool>)

QueryVisitorExtensions.FindExcept<TContext>(IQueryElement?, TContext, IQueryElement, Func<TContext, IQueryElement, bool>)

QueryVisitorExtensions.Find<TContext>(IQueryElement?, TContext, Func<TContext, IQueryElement, bool>)

QueryVisitorExtensions.Visit(IQueryElement, Action<IQueryElement>)

QueryVisitorExtensions.VisitAll(IQueryElement, Action<IQueryElement>)

QueryVisitorExtensions.VisitAll<TContext>(IQueryElement, TContext, Action<TContext, IQueryElement>)

QueryVisitorExtensions.VisitParentFirst(IQueryElement, Func<IQueryElement, bool>)

QueryVisitorExtensions.VisitParentFirstAll(IQueryElement, Func<IQueryElement, bool>)

QueryVisitorExtensions.VisitParentFirstAll<TContext>(IQueryElement, TContext, Func<TContext, IQueryElement, bool>)

QueryVisitorExtensions.VisitParentFirst<TContext>(IQueryElement, TContext, Func<TContext, IQueryElement, bool>)

QueryVisitorExtensions.Visit<TContext>(IQueryElement, TContext, Action<TContext, IQueryElement>)

QueryHelper.CanBeNullableOrUnknown(ISqlExpression, NullabilityContext, bool)

QueryHelper.IsPredicate(ISqlExpression)

QueryHelper.ShouldCheckForNull(ISqlExpression, NullabilityContext)

ISqlExpressionExtensions.AreEqual(ISqlExpression?, ISqlExpression?, Func<ISqlExpression, ISqlExpression, bool>)

QueryVisitorExtensions.Clone<T>(T?)

QueryVisitorExtensions.Clone<T>(T?, Dictionary<IQueryElement, IQueryElement>)

QueryVisitorExtensions.Clone<T>(T?, Func<IQueryElement, bool>)

QueryVisitorExtensions.Clone<T, TContext>(T?, TContext, Dictionary<IQueryElement, IQueryElement>, Func<TContext, IQueryElement, bool>)

QueryVisitorExtensions.Clone<T, TContext>(T?, TContext, Func<TContext, IQueryElement, bool>)

QueryVisitorExtensions.ConvertAll<T>(T, bool, Func<SqlQueryConvertVisitor<object?>, IQueryElement, IQueryElement>)

QueryVisitorExtensions.ConvertAll<TContext, T>(T, TContext, bool, Func<SqlQueryConvertVisitor<TContext>, IQueryElement, IQueryElement>)

QueryVisitorExtensions.ConvertAll<TContext, T>(T, TContext, Func<SqlQueryConvertVisitor<TContext>, IQueryElement, IQueryElement>)

QueryVisitorExtensions.Convert<T>(T, Func<SqlQueryConvertVisitor<object?>, IQueryElement, IQueryElement>)

QueryVisitorExtensions.Convert<T>(T, Func<SqlQueryConvertVisitor<object?>, IQueryElement, IQueryElement>, bool)

QueryVisitorExtensions.Convert<TContext, T>(T, TContext, bool, Func<SqlQueryConvertVisitor<TContext>, IQueryElement, IQueryElement>)

QueryVisitorExtensions.Convert<TContext, T>(T, TContext, bool, Func<SqlQueryConvertVisitor<TContext>, IQueryElement, IQueryElement>, bool)

QueryVisitorExtensions.Convert<TContext, T>(T, TContext, Func<SqlQueryConvertVisitor<TContext>, IQueryElement, IQueryElement>)

QueryVisitorExtensions.Convert<TContext, T>(T, TContext, Func<SqlQueryConvertVisitor<TContext>, IQueryElement, IQueryElement>, bool)

QueryVisitorExtensions.Replace<T>(T, IDictionary<IQueryElement, IQueryElement>, params IQueryElement[])

Sql.IsDistinctFrom<T>(T, T)

Sql.IsNotDistinctFrom<T>(T, T)

SqlExtensions.In<T>(T, T, T)

SqlExtensions.In<T>(T, T, T, T)

SqlExtensions.In<T>(T, params T[])

SqlExtensions.In<T>(T, IEnumerable<T>)

SqlExtensions.In<T>(T, IQueryable<T>)

SqlExtensions.NotIn<T>(T, T, T)

SqlExtensions.NotIn<T>(T, T, T, T)

SqlExtensions.NotIn<T>(T, params T[])

SqlExtensions.NotIn<T>(T, IEnumerable<T>)

SqlExtensions.NotIn<T>(T, IQueryable<T>)

Constructors

SqlDefaultValueExpression(DbDataType, object?)

Creates the default of a column of type type.

public SqlDefaultValueExpression(DbDataType type, object? value)

Parameters

type DbDataType

The column's type.

value object

The default the reader substitutes for a NULL.

Properties

ElementType

AST node type.

public override QueryElementType ElementType { get; }

Property Value

QueryElementType

Precedence

public override int Precedence { get; }

Property Value

int

SystemType

public override Type? SystemType { get; }

Property Value

Type

Type

The column's type.

public DbDataType Type { get; }

Property Value

DbDataType

Value

The default the reader substitutes for a NULL.

public object? Value { get; }

Property Value

object

Methods

Accept(QueryElementVisitor)

Visitor support.

public override IQueryElement Accept(QueryElementVisitor visitor)

Parameters

visitor QueryElementVisitor

Returns

IQueryElement

CanBeNullable(NullabilityContext)

public override bool CanBeNullable(NullabilityContext nullability)

Parameters

nullability NullabilityContext

Returns

bool

Equals(ISqlExpression, Func<ISqlExpression, ISqlExpression, bool>)

public override bool Equals(ISqlExpression other, Func<ISqlExpression, ISqlExpression, bool> comparer)

Parameters

other ISqlExpression

comparer Func<ISqlExpression, ISqlExpression, bool>

Returns

bool

GetElementHashCode()

public override int GetElementHashCode()

Returns

int

GetHashCode()

Serves as the default hash function.

public override int GetHashCode()

Returns

int

A hash code for the current object.

ToString(QueryElementTextWriter)

Generates debug text representation of AST node.

public override QueryElementTextWriter ToString(QueryElementTextWriter writer)

Parameters

writer QueryElementTextWriter

Returns

QueryElementTextWriter