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IS_MEMBER(group | role)
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Description
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Indicates whether the current user is a member of a Windows NT group or SQL Server role. Indicates whether the current user is a member of the specified server role.
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SUSER_ID([login])
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Returns the user s login identification number. Returns the user s login identification name. Returns the user s security identification number. Returns the login identification name for the user s security identification number. Returns the database user s identification number. Returns the database user name.
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SUSER_NAME([user_id])
SUSER_SID([login])
SUSER_SNAME([user_sid])
USER_ID([user])
USER
Text and Image Functions
SQL Server does not have an elaborate set of text and image functions, since you should generally not keep your documents or pictures inside the database. The proper place for these files is in the file system. You should keep only descriptions of and pointers (that is, the path) to those files in the database itself.
Function
PATINDEX(%pattern%, expression)
Description
Returns the starting position of the first occurrence of the pattern. Returns the text pointer value. Validates the given text pointer.
TEXTPTR(column)
TEXTVALID(column, text_pointer)
5:
Functions
Cursor Functions
These functions are designed to return status information about cursors and cursor operations.
Function
@@@CURSOR_ROWS
Description
Returns the number of rows that are in the last cursor opened in the connection. Determines whether a procedure returned a cursor and result set for the given parameter. Returns status of the last cursor fetch statement.
CURSOR_STATUS({ local , cursor_name } CURSOR_STATUS { global , cursor_name } CURSOR_STATUS { variable , cursor_variable }) @@@FETCH_STATUS
Configuration Functions
These functions return information about different settings and constants for the SQL Server implementation:
Function @@@CONNECTIONS
Description
Returns the number of connections since SQL Server was started. Returns the value of the SET DATEFIRST parameter that indicates the specified first day of each week. Returns the value of the timestamp datatype. Returns the name of the language that is currently in use by SQL Server.
@@@DATEFIRST
@@@DBTS
@@@LANGUAGE
SQL Server 2000 Stored Procedure Programming
Function @@@LANGID
Description
Returns the language ID for the language that is currently in use by SQL Server. Returns the lock time-out setting (milliseconds). Returns the maximum number of simultaneous connections allowed on SQL Server. Returns the level of precision used by decimal and numeric datatypes on the server. Returns information about current SET options. Returns the nesting level for the current stored procedure. Returns the name of a remote server. Returns the server process ID for the current process. Returns the name of the server. Returns the name of the registry key under which SQL Server is running. Returns the current value of the TEXTSIZE option specified by the SET statement (maximum length in bytes of text and image data in the Select statement). Returns date, processor type, and version of Microsoft SQL Server.
@@@LOCK_TIMEOUT
@@@MAX_CONNECTIONS
@@@MAX_PRECISION
@@@OPTIONS
@@@NESTLEVEL
@@@REMSERVER @@@SPID
@@@SERVERNAME @@@SERVICENAME
@@@TEXTSIZE
@@@VERSION
A stored procedure can call or execute another stored procedure. Such stored procedures are said to be nesting. SQL Server 7.0 and SQL Server 2000 have a limit of 32 stored procedure nesting levels. Earlier versions could nest up to 16 stored procedures.
5:
Functions
The @@NESTLEVEL global variable keeps track of the number of nesting levels and can be used before executing a stored procedure to determine whether the number of nesting levels will cause the stored procedure to fail.
TIP: Although the number of nesting levels is limited, there is no limit on the number of stored procedures that can be called from a single stored procedure. You can use this capability to construct a workaround if you ever encounter a problem with this issue. You will seldom have this problem, but the function has value as a debugging tool. You should not bother to test this value before each procedure call.
System Statistical Functions
SQL Server maintains statistics about its performance and execution from the moment that it is started. The following functions are designed to obtain statistical information:
Function
@@@CPU_BUSY
Description
Returns the time the CPU spent performing a task since SQL Server was last started. Time is in milliseconds. Returns the time (in milliseconds) that SQL Server has been idle since it was started. Returns the time (in milliseconds) that SQL Server spent performing input and output operations since it was started. Returns the number of input packets read from the network. Returns the number of output packets written to the network. Returns the number of network packet errors since SQL Server was started.
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