Procedure for obtaining the required column name based on the table name and Index

Copy codeThe Code is as follows:
Create proc p_sword_getblcolumn
(
@ TblName varchar (200 ),
@ FromIndex int,
@ ToIndex int,
@ Column name varchar (3000) output
)
As
Begin
Declare @ tempColumn varchar (3000)
Declare @ errMsg varchar (200)
Declare @ I int
Set @ I = 1
Set @ columnName =''
Set @ errMsg =''
Declare tempColumnCur cursor
Select syscolumns. name from syscolumns join sysobjects on syscolumns. id = sysobjects. id
Where sysobjects. name = @ tblName order by syscolumns. colorder
Open tempColumnCur
Fetch next from tempColumnCur into @ tempColumn
While @ FETCH_STATUS = 0
Begin
If (@ fromIndex = 0 and @ toIndex = 0)
Begin
Set @ columnName = @ columnName + ',' + @ tempColumn
End
If (@ fromIndex = 0 and @ toIndex <> 0)
Begin
If (@ I <= @ toIndex)
Set @ columnName = @ columnName + ',' + @ tempColumn
End
Else if (@ fromIndex <> 0 and @ toIndex = 0)
Begin
If (@ I >=@ fromIndex)
Set @ columnName = @ columnName + ',' + @ tempColumn
End
Else if (@ I >=@ fromIndex and @ I <= @ toIndex)
Begin
Set @ columnName = @ columnName + ',' + @ tempColumn
End
Set @ I = @ I + 1
Print @ I
Fetch next from tempColumnCur into @ tempColumn
End
Close tempColumnCur
Deallocate tempColumnCur
Set @ columnName = SUBSTRING (@ columnName, 2, len (@ columnName ))
Print @ columnName
If (@ ERROR <> 0)
Begin
Set @ errMsg = 'get column error'
Goto errorproc
End
Else
Return 0
End
Errorproc:
Begin
Raiserror (@ errMsg, 16, 1)
Return 1
End
Go

The raiserror function is involved.
RAISERROR ({msg_id | msg_str | @ local_variable}
{, Severity, state}
[, Argument [,... n]
)
[WITH option [,... n]
Parameter description:
First parameter: {msg_id | msg_str | @ local_variable}
Msg_id: indicates the message code defined in the sys. messages table;
Use sp_addmessage to store the User-Defined error message number in the sys. messages directory view.
The error code of the custom error message must be greater than 50000.
Msg_str: indicates a user-defined message. The error message can contain a maximum of 2047 characters;
(If it is a constant, use n'xxx' because it is nvarchar)
When msg_str is specified, RAISERROR will trigger an error message with the error code 5000.
@ Local_variable: format the string variable in msg_str mode.
Second parameter: severity
The severity level of the message associated with the user-defined message. (This is important)
Any user can specify a severity level between 0 and 18.
Within the closed interval of [], catch is not skipped;
If it is [11,19], it will jump to catch;
If [20, infinite), the database connection is terminated directly;
Third parameter: state
If the same user-defined error is thrown at multiple locations,
You can use a unique status number for each location to locate the code segment that causes the error.
Any integer between 1 and 127. (The default value of state is 1)
An error is generated when the state value is 0 or greater than 127!
Fourth parameter: argument
The parameter used to replace msg_str or the variable defined in the message corresponding to msg_id.
Fifth parameter: option
Incorrect custom options can be any of the following values:
LOG: records errors in error logs and application logs;
NOWAIT: send the message to the client immediately;
SETERROR: set the value of @ ERROR and ERROR_NUMBER to msg_id or 50000;