Table of Contents

Class PgArrayIndexExpression

Namespace
Npgsql.EntityFrameworkCore.PostgreSQL.Query.Expressions.Internal
Assembly
Npgsql.EntityFrameworkCore.PostgreSQL.dll

An SQL expression that represents an indexing into a PostgreSQL array.

public class PgArrayIndexExpression : SqlExpression, IRelationalQuotableExpression, IPrintableExpression, IEquatable<PgArrayIndexExpression>
Inheritance
PgArrayIndexExpression
Implements
Inherited Members

Remarks

SqlBinaryExpression specifically disallows having an OperatorType of value ArrayIndex as arrays are a PostgreSQL-only feature.

Constructors

PgArrayIndexExpression(SqlExpression, SqlExpression, bool, Type, RelationalTypeMapping?)

Creates a new instance of the PgArrayIndexExpression class.

public PgArrayIndexExpression(SqlExpression array, SqlExpression index, bool nullable, Type type, RelationalTypeMapping? typeMapping)

Parameters

array SqlExpression

The array tp index into.

index SqlExpression

An position in the array to index into.

nullable bool

Whether the expression is nullable.

type Type

The Type of the expression.

typeMapping RelationalTypeMapping

The RelationalTypeMapping associated with the expression.

Properties

Array

The array being indexed.

public virtual SqlExpression Array { get; }

Property Value

SqlExpression

Index

The index in the array.

public virtual SqlExpression Index { get; }

Property Value

SqlExpression

IsNullable

Whether the expression is nullable.

public virtual bool IsNullable { get; }

Property Value

bool

Methods

Equals(PgArrayIndexExpression?)

Indicates whether the current object is equal to another object of the same type.

public virtual bool Equals(PgArrayIndexExpression? other)

Parameters

other PgArrayIndexExpression

An object to compare with this object.

Returns

bool

true if the current object is equal to the other parameter; otherwise, false.

Equals(object?)

Determines whether the specified object is equal to the current object.

public override bool Equals(object? obj)

Parameters

obj object

The object to compare with the current object.

Returns

bool

true if the specified object is equal to the current object; otherwise, false.

GetHashCode()

Serves as the default hash function.

public override int GetHashCode()

Returns

int

A hash code for the current object.

Print(ExpressionPrinter)

Creates a printable string representation of the given expression using ExpressionPrinter.

protected override void Print(ExpressionPrinter expressionPrinter)

Parameters

expressionPrinter ExpressionPrinter

The expression printer to use.

Quote()

Quotes the expression; that is, returns an expression that, when evaluated, would construct an expression identical to this one. Used to generate code for precompiled queries, which reconstructs this expression.

public override Expression Quote()

Returns

Expression

ToString()

Returns a textual representation of the Expression.

public override string ToString()

Returns

string

A textual representation of the Expression.

Update(SqlExpression, SqlExpression)

Creates a new expression that is like this one, but using the supplied children. If all of the children are the same, it will return this expression.

public virtual PgArrayIndexExpression Update(SqlExpression array, SqlExpression index)

Parameters

array SqlExpression

The Array property of the result.

index SqlExpression

The Index property of the result.

Returns

PgArrayIndexExpression

This expression if no children changed, or an expression with the updated children.

VisitChildren(ExpressionVisitor)

Reduces the node and then calls the visitor delegate on the reduced expression. The method throws an exception if the node is not reducible.

protected override Expression VisitChildren(ExpressionVisitor visitor)

Parameters

visitor ExpressionVisitor

An instance of Func<T, TResult>.

Returns

Expression

The expression being visited, or an expression which should replace it in the tree.

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