Class NpgsqlParameter

This class represents a parameter to a command that will be sent to server

Inheritance

object

NpgsqlParameter

NpgsqlParameter<T>

Implements

IDbDataParameter

ICloneable

Namespace: Npgsql

Assembly: Npgsql.dll

Syntax

public class NpgsqlParameter : DbParameter, IDbDataParameter, ICloneable

Constructors

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NpgsqlParameter()

Initializes a new instance of the NpgsqlParameter class.

Declaration

public NpgsqlParameter()

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NpgsqlParameter(string?, DbType, int, string?)

Initializes a new instance of the NpgsqlParameter.

Declaration

public NpgsqlParameter(string? parameterName, DbType parameterType, int size, string? sourceColumn)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
DbType	parameterType	One of the values.
int	size	The length of the parameter.
string?	sourceColumn	The name of the source column.

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NpgsqlParameter(string?, DbType, int)

Initializes a new instance of the NpgsqlParameter.

Declaration

public NpgsqlParameter(string? parameterName, DbType parameterType, int size)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
DbType	parameterType	One of the values.
int	size	The length of the parameter.

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NpgsqlParameter(string?, DbType)

Initializes a new instance of the NpgsqlParameter.

Declaration

public NpgsqlParameter(string? parameterName, DbType parameterType)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
DbType	parameterType	One of the values.

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NpgsqlParameter(string?, NpgsqlDbType, int, string?)

Initializes a new instance of the NpgsqlParameter

Declaration

public NpgsqlParameter(string? parameterName, NpgsqlDbType parameterType, int size, string? sourceColumn)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
NpgsqlDbType	parameterType	One of the NpgsqlDbType values.
int	size	The length of the parameter.
string?	sourceColumn	The name of the source column.

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NpgsqlParameter(string?, NpgsqlDbType, int)

Initializes a new instance of the NpgsqlParameter.

Declaration

public NpgsqlParameter(string? parameterName, NpgsqlDbType parameterType, int size)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
NpgsqlDbType	parameterType	One of the NpgsqlDbType values.
int	size	The length of the parameter.

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NpgsqlParameter(string?, NpgsqlDbType)

Initializes a new instance of the NpgsqlParameter class with the parameter name and the data type.

Declaration

public NpgsqlParameter(string? parameterName, NpgsqlDbType parameterType)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
NpgsqlDbType	parameterType	One of the NpgsqlDbType values.

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NpgsqlParameter(string?, object?)

Initializes a new instance of the NpgsqlParameter class with the parameter name and a value.

Declaration

public NpgsqlParameter(string? parameterName, object? value)

Parameters

Type	Name	Description
string?	parameterName	The name of the parameter to map.
object?	value	The value of the NpgsqlParameter.

Remarks

When you specify an in the value parameter, the is inferred from the CLR type.

When using this constructor, you must be aware of a possible misuse of the constructor which takes a DbType parameter. This happens when calling this constructor passing an int 0 and the compiler thinks you are passing a value of DbType. Use for example to have compiler calling the correct constructor.

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NpgsqlParameter(string, DbType, int, string?, ParameterDirection, bool, byte, byte, DataRowVersion, object)

Initializes a new instance of the NpgsqlParameter.

Declaration

public NpgsqlParameter(string parameterName, DbType parameterType, int size, string? sourceColumn, ParameterDirection direction, bool isNullable, byte precision, byte scale, DataRowVersion sourceVersion, object value)

Parameters

Type	Name	Description
string	parameterName	The name of the parameter to map.
DbType	parameterType	One of the values.
int	size	The length of the parameter.
string?	sourceColumn	The name of the source column.
ParameterDirection	direction	One of the values.
bool	isNullable	true if the value of the field can be null, otherwise false.
byte	precision	The total number of digits to the left and right of the decimal point to which Value is resolved.
byte	scale	The total number of decimal places to which Value is resolved.
DataRowVersion	sourceVersion	One of the values.
object	value	An that is the value of the NpgsqlParameter.

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NpgsqlParameter(string, NpgsqlDbType, int, string?, ParameterDirection, bool, byte, byte, DataRowVersion, object)

Initializes a new instance of the NpgsqlParameter.

Declaration

public NpgsqlParameter(string parameterName, NpgsqlDbType parameterType, int size, string? sourceColumn, ParameterDirection direction, bool isNullable, byte precision, byte scale, DataRowVersion sourceVersion, object value)

Parameters

Type	Name	Description
string	parameterName	The name of the parameter to map.
NpgsqlDbType	parameterType	One of the NpgsqlDbType values.
int	size	The length of the parameter.
string?	sourceColumn	The name of the source column.
ParameterDirection	direction	One of the values.
bool	isNullable	true if the value of the field can be null, otherwise false.
byte	precision	The total number of digits to the left and right of the decimal point to which Value is resolved.
byte	scale	The total number of decimal places to which Value is resolved.
DataRowVersion	sourceVersion	One of the values.
object	value	An that is the value of the NpgsqlParameter.

Properties

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Collection

The collection to which this parameter belongs, if any.

Declaration

public NpgsqlParameterCollection? Collection { get; set; }

Property Value

Type	Description
NpgsqlParameterCollection

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DataTypeName

Used to specify which PostgreSQL type will be sent to the database for this parameter.

Declaration

public string? DataTypeName { get; set; }

Property Value

Type	Description
string?

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DbType

Gets or sets the of the parameter.

Declaration

public override sealed DbType DbType { get; set; }

Property Value

Type	Description
DbType	One of the values. The default is .

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Direction

Declaration

public override sealed ParameterDirection Direction { get; set; }

Property Value

Type	Description
ParameterDirection

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IsNullable

Declaration

public override sealed bool IsNullable { get; set; }

Property Value

Type	Description
bool

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NpgsqlDbType

Gets or sets the NpgsqlDbType of the parameter.

Declaration

public NpgsqlDbType NpgsqlDbType { get; set; }

Property Value

Type	Description
NpgsqlDbType	One of the NpgsqlDbType values. The default is NpgsqlDbType.

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NpgsqlValue

Gets or sets the value of the parameter.

Declaration

public object? NpgsqlValue { get; set; }

Property Value

Type	Description
object?	An that is the value of the parameter. The default value is null.

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ParameterName

Gets or sets The name of the NpgsqlParameter.

Declaration

public override sealed string ParameterName { get; set; }

Property Value

Type	Description
string	The name of the NpgsqlParameter. The default is an empty string.

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PostgresType

The PostgreSQL data type, such as int4 or text, as discovered from pg_type. This property is automatically set if parameters have been derived via DeriveParameters(NpgsqlCommand) and can be used to acquire additional information about the parameters' data type.

Declaration

public PostgresType? PostgresType { get; }

Property Value

Type	Description
PostgresType

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Precision

Gets or sets the maximum number of digits used to represent the Value property.

Declaration

public byte Precision { get; set; }

Property Value

Type	Description
byte	The maximum number of digits used to represent the Value property. The default value is 0, which indicates that the data provider sets the precision for Value.

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Scale

Gets or sets the number of decimal places to which Value is resolved.

Declaration

public byte Scale { get; set; }

Property Value

Type	Description
byte	The number of decimal places to which Value is resolved. The default is 0.

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Size

Declaration

public override sealed int Size { get; set; }

Property Value

Type	Description
int

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SourceColumn

Declaration

public override sealed string SourceColumn { get; set; }

Property Value

Type	Description
string

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SourceColumnNullMapping

Declaration

public override sealed bool SourceColumnNullMapping { get; set; }

Property Value

Type	Description
bool

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SourceVersion

Declaration

public override sealed DataRowVersion SourceVersion { get; set; }

Property Value

Type	Description
DataRowVersion

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Value

Declaration

public override object? Value { get; set; }

Property Value

Type	Description
object?

Methods

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Clone()

Creates a new NpgsqlParameter that is a copy of the current instance.

Declaration

public NpgsqlParameter Clone()

Returns

Type	Description
NpgsqlParameter	A new NpgsqlParameter that is a copy of this instance.

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ResetDbType()

Declaration

public override void ResetDbType()

Implements

IDbDataParameter

ICloneable