Class NpgsqlDbFunctionsExtensions

Namespace

Microsoft.EntityFrameworkCore

Assembly

Npgsql.EntityFrameworkCore.PostgreSQL.dll

Provides Npgsql-specific extension methods on DbFunctions.

public static class NpgsqlDbFunctionsExtensions

Inheritance

object

NpgsqlDbFunctionsExtensions

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.MemberwiseClone()

object.ReferenceEquals(object, object)

object.ToString()

Methods

Distance(DbFunctions, DateOnly, DateOnly)

Returns the distance between two dates as a number of days, particularly suitable for sorting where the appropriate index is defined.

public static int Distance(this DbFunctions _, DateOnly a, DateOnly b)

Parameters

_ DbFunctions

a DateOnly

b DateOnly

Returns

int

Remarks

This requires the btree_gist built-in PostgreSQL extension, see https://www.postgresql.org/docs/current/btree-gist.html.

Distance(DbFunctions, DateTime, DateTime)

Returns the distance between two timestamps as a PostgreSQL interval, particularly suitable for sorting where the appropriate index is defined.

public static TimeSpan Distance(this DbFunctions _, DateTime a, DateTime b)

Parameters

_ DbFunctions

a DateTime

b DateTime

Returns

TimeSpan

Remarks

This requires the btree_gist built-in PostgreSQL extension, see https://www.postgresql.org/docs/current/btree-gist.html.

GreaterThan(DbFunctions, ITuple, ITuple)

Returns whether the row value represented by a is greater than the row value represented by b.

public static bool GreaterThan(this DbFunctions _, ITuple a, ITuple b)

Parameters

_ DbFunctions

a ITuple

b ITuple

Returns

bool

Remarks

For more information on row value comparisons, see the PostgreSQL documentation.

GreaterThanOrEqual(DbFunctions, ITuple, ITuple)

Returns whether the row value represented by a is greater than or equal to the row value represented by b.

public static bool GreaterThanOrEqual(this DbFunctions _, ITuple a, ITuple b)

Parameters

_ DbFunctions

a ITuple

b ITuple

Returns

bool

Remarks

For more information on row value comparisons, see the PostgreSQL documentation.

ILike(DbFunctions, string, string)

An implementation of the PostgreSQL ILIKE operation, which is an insensitive LIKE.

public static bool ILike(this DbFunctions _, string matchExpression, string pattern)

Parameters

_ DbFunctions

The DbFunctions instance.

matchExpression string

The string that is to be matched.

pattern string

The pattern which may involve wildcards %,_,[,],^.

Returns

bool

true if there is a match.

ILike(DbFunctions, string, string, string)

An implementation of the PostgreSQL ILIKE operation, which is an insensitive LIKE.

public static bool ILike(this DbFunctions _, string matchExpression, string pattern, string escapeCharacter)

Parameters

_ DbFunctions

The DbFunctions instance.

matchExpression string

The string that is to be matched.

pattern string

The pattern which may involve wildcards %,_,[,],^.

escapeCharacter string

The escape character (as a single character string) to use in front of %,_,[,],^ if they are not used as wildcards.

Returns

bool

true if there is a match.

LessThan(DbFunctions, ITuple, ITuple)

Returns whether the row value represented by a is less than the row value represented by b.

public static bool LessThan(this DbFunctions _, ITuple a, ITuple b)

Parameters

_ DbFunctions

a ITuple

b ITuple

Returns

bool

Remarks

For more information on row value comparisons, see the PostgreSQL documentation.

LessThanOrEqual(DbFunctions, ITuple, ITuple)

Returns whether the row value represented by a is less than or equal to the row value represented by b.

public static bool LessThanOrEqual(this DbFunctions _, ITuple a, ITuple b)

Parameters

_ DbFunctions

a ITuple

b ITuple

Returns

bool

Remarks

For more information on row value comparisons, see the PostgreSQL documentation.

Reverse(DbFunctions, string)

Reverses a string by calling PostgreSQL reverse().

public static string Reverse(this DbFunctions _, string value)

Parameters

_ DbFunctions

The DbFunctions instance.

value string

The string that is to be reversed.

Returns

string

The reversed string.

StringToArray(DbFunctions, string, string)

Splits value at occurrences of delimiter and forms the resulting fields into a text array.

public static string[] StringToArray(this DbFunctions _, string value, string delimiter)

Parameters

_ DbFunctions

The DbFunctions instance.

value string

The string to be split.

delimiter string

If null, each character in the string will become a separate element in the array. If an empty string, the string is treated as a single field.

Returns

string[]

Exceptions

InvalidOperationException

StringToArray(DbFunctions, string, string, string)

Splits value at occurrences of delimiter and forms the resulting fields into a text array.

public static string[] StringToArray(this DbFunctions _, string value, string delimiter, string nullString)

Parameters

_ DbFunctions

The DbFunctions instance.

value string

The string to be split.

delimiter string

If null, each character in the string will become a separate element in the array. If an empty string, the string is treated as a single field.

nullString string

Fields matching this value string are replaced by null.

Returns

string[]