System Functions

Article
04/12/2011

The .NET Framework Data Provider for SQL Server (SqlClient) provides the following system functions:

Function	Description
CHECKSUM (value, [value, [value]])	Returns the checksum value. CHECKSUM is intended for use in building hash indexes. Arguments value: A Boolean, Byte, Int16, Int32, Int64, Single, Decimal, Double, DateTime, String, Binary, or Guid. You can specify one, two or three values. Return Value The absolute value of the specified expression. Example `SqlServer.CHECKSUM(10,100,1000.0)`
CURRENT_TIMESTAMP ()	Produces the current date and time in SQL Server internal format for DateTime values with a precision of 7 in SQL Server 2008 and a precision of 3 in SQL Server 2005. Return Value The current system date and time as a DateTime. Example `SqlServer.CURRENT_TIMESTAMP()`
CURRENT_ USER ()	Returns the name of the current user. Return Value An ASCII String. Example `SqlServer.CURRENT_USER()`
DATALENGTH (expression)	Returns the number of bytes used to represent any expression. Arguments expression: A Boolean, Byte, Int16, Int32, Int64, Single, Decimal, Double, DateTime, Time, DateTimeOffset, String, Binary, or Guid. Return Value The size of properties as an Int32. Example `SELECT VALUE SqlServer.DATALENGTH(P.Name)FROM` `AdventureWorksEntities.Product AS P`
HOST_NAME()	Returns the workstation name. Return Value A Unicode String. Example `SqlServer.HOST_NAME()`
ISDATE(expression)	Determines whether an input expression is a valid date. Arguments expression: A Boolean, Byte, Int16, Int32, Int64, Single, Decimal, Double, DateTime, Time, DateTimeOffset, String, Binary, or Guid. Return Value An Int32. One (1) if the input expression is a valid date. Zero (0) otherwise. Example `SqlServer.ISDATE('1/1/2006')`
ISNUMERIC(expression)	Determines whether an expression is a valid numeric type. Arguments expression: A Boolean, Byte, Int16, Int32, Int64, Single, Decimal, Double, DateTime, Time, DateTimeOffset, String, Binary, or Guid. Return Value An Int32. One (1) if the input expression is a valid date. Zero (0) otherwise. Example `SqlServer.ISNUMERIC('21')`
NEWID()	Creates a unique value of type Guid. Return Value A Guid. Example `SqlServer.NEWID()`
USER_NAME(id)	Returns a database user name from a specified identification number. Arguments expression: An Int32 identification number associated with a database user. Return Value A Unicode String. Example `SqlServer.USER_NAME(0)`

For more information about the string functions that SqlClient supports, see the documentation for the SQL Server version that you specified in the SqlClient provider manifest:

SQL Server 2000	SQL Server 2005	SQL Server 2008
System Functions Transact-SQL)	System Functions Transact-SQL)	System Functions (Transact-SQL)

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System Functions

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