Google.Cloud.Spanner.Data - Class SpannerParameter (5.0.0-beta03)

public sealed class SpannerParameter : DbParameter, IDbDataParameter, IDataParameter, ICloneable

Reference documentation and code samples for the Google.Cloud.Spanner.Data class SpannerParameter.

Represents a parameter to a SpannerCommand and optionally its mapping to DataSet columns.

Inheritance

object > MarshalByRefObject > DbParameter > SpannerParameter

Implements

IDbDataParameter, IDataParameter, ICloneable

Inherited Members

DbParameter.Precision

DbParameter.Scale

MarshalByRefObject.GetLifetimeService()

MarshalByRefObject.InitializeLifetimeService()

object.GetHashCode()

object.GetType()

object.ToString()

Namespace

Google.Cloud.Spanner.Data

Assembly

Google.Cloud.Spanner.Data.dll

Constructors

SpannerParameter()

public SpannerParameter()

Initializes a new instance of the SpannerParameter class.

SpannerParameter(string, SpannerDbType, object, string)

public SpannerParameter(string parameterName, SpannerDbType type, object value = null, string sourceColumn = null)

Initializes a new instance of the SpannerParameter class.

Parameters
Name	Description
`parameterName`	`string` The name of the parameter. For Insert, Update and Delete commands, this name should be the name of a valid column in a Spanner table. In Select commands, this name should be the name of a parameter used in the SQL Query. This value is case sensitive. Must not be null.
`type`	`SpannerDbType` One of the SpannerDbType values that indicates the type of the parameter. Must not be null.
`value`	`object` An object that is the value of the SpannerParameter. May be null.
`sourceColumn`	`string` The name of the DataTable source column (SourceColumn) if this SpannerParameter is used in a call to Update. May be null.

Properties

CommitTimestamp

public static object CommitTimestamp { get; }

Returns a value that will be replaced with a commit timestamp on insert or update. Only suitable for Timestamp values.

Property Value
Type	Description
`object`

DbType

public override DbType DbType { get; set; }

Specifies the data type of a field, a property, or a Parameter object of a .NET Framework data provider.

Property Value
Type	Description
`DbType`

Overrides

DbParameter.DbType

Remarks

Using DbType of VarNumeric will always default to SpannerDbType of SpannerNumeric and never to PgNumeric.

Direction

public override ParameterDirection Direction { get; set; }

Gets or sets a value that indicates whether the parameter is input-only, output-only, bidirectional, or a stored procedure return value parameter.

Property Value
Type	Description
`ParameterDirection`	One of the ParameterDirection values. The default is `Input`.

Overrides

DbParameter.Direction

Exceptions
Type	Description
`ArgumentException`	The property is not set to one of the valid ParameterDirection values.

IsNullable

public override bool IsNullable { get; set; }

Gets or sets a value that indicates whether the parameter accepts null values.

Property Value
Type	Description
`bool`	true if null values are accepted; otherwise false. The default is false.

Overrides

DbParameter.IsNullable

ParameterName

public override string ParameterName { get; set; }

Gets or sets the name of the DbParameter.

Property Value
Type	Description
`string`	The name of the DbParameter. The default is an empty string ("").

Overrides

DbParameter.ParameterName

Size

public override int Size { get; set; }

Gets or sets the maximum size, in bytes, of the data within the column.

Property Value
Type	Description
`int`	The maximum size, in bytes, of the data within the column. The default value is inferred from the parameter value.

Overrides

DbParameter.Size

SourceColumn

public override string SourceColumn { get; set; }

Gets or sets the name of the source column mapped to the DataSet and used for loading or returning the Value.

Property Value
Type	Description
`string`	The name of the source column mapped to the DataSet. The default is an empty string.

Overrides

DbParameter.SourceColumn

SourceColumnNullMapping

public override bool SourceColumnNullMapping { get; set; }

Sets or gets a value which indicates whether the source column is nullable. This allows DbCommandBuilder to correctly generate Update statements for nullable columns.

Property Value
Type	Description
`bool`	true if the source column is nullable; false if it is not.

Overrides

DbParameter.SourceColumnNullMapping

SourceVersion

public override DataRowVersion SourceVersion { get; set; }

Gets or sets the DataRowVersion to use when you load Value.

Property Value
Type	Description
`DataRowVersion`	One of the DataRowVersion values. The default is `Current`.

Overrides

DbParameter.SourceVersion

Exceptions
Type	Description
`ArgumentException`	The property is not set to one of the DataRowVersion values.

SpannerDbType

public SpannerDbType SpannerDbType { get; set; }

The SpannerDbType of the parameter or column. This should match the type as defined in Spanner or as defined by the result of a SQL Query.

Property Value
Type	Description
`SpannerDbType`

Value

public override object Value { get; set; }

Gets or sets the value of the parameter.

Property Value
Type	Description
`object`	An object that is the value of the parameter. The default value is null.

Overrides

DbParameter.Value

Methods

Clone()

public object Clone()

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

Returns
Type	Description
`object`	A new object that is a copy of this instance.

ResetDbType()

public override void ResetDbType()

Resets the DbType property to its original settings.

Overrides

DbParameter.ResetDbType()