Thursday, June 6, 2013

Sql Server: Alter Table in Design

Many a time while making changes to the definition of the Sql Server Table we get the following message:
"Saving not permitted. The changes you have made require the following tables to be dropped and re-created or enable option Prevent saving changes that require the table to be re-created. "

Image

To disable the option "Prevent saving changes that require the table to be re-created"
Go to Tools > Options > Designers > "Un-check" "Prevent saving changes that require the table to be re-created"

Sql Server Hack-Save Changes

SSIS Task: For loop Vs For Each Loop

For Loop


For Loop is used for looping through a number of tasks for a set number of times.


Simply:->  initialize, verify condition, increment\assign


For Each

ForEach Loop loops through various things such as files, objects, ADO connections, etc.

Above screen shot show we have task configured for “Foreach file enumerator” which can be used to move\copy\delete file (of given file) in a given folder


Enumerator configuration:


Folder: Specify the folder path from where we need to process the files


Flies: File name (format) \ file extension





  • Fully qualified: File name along with location is returned .Eg:  C:\Example.txt




  • Name and extension: The file name with its extension is returned.Eg: Example.txt




  • Name only: The file name without its extension is returned.Eg: Example




Variable Mapping



Result of the for loop will be assigned to variable and its value can be used further.





  • Foreach File Enumerator: Enumerates files in a folder




  • Foreach Item Enumeration: Enumerates items in a collection, such as the executables specified in an Execute Process task.




  • Foreach ADO Enumerator: Enumerates rows in a table, such as the rows in an ADO recordset.




  • Foreach ADO.NET Schema Rowset Enumerator: Enumerates schema information about a data source.




  • Foreach From Variable Enumerator: Enumerates a list of objects in a variable, such as an array or ADO.NET DataTable.




  • Foreach NodeList Enumeration: Enumerates the result set of an XML Path Language (XPath) expression.




  • Foreach SMO Enumerator: Enumerates a list of SQL Server Management Objects (SMO) objects, such as a list of views in a database.



Friday, May 24, 2013

SSIS: Derived column : Conditional Operator + Hardcoding Null

Using Conditional Operator In SSIS:

«boolean_expression» ? «when_true» : «when_false»

To hardcode Null : NULL(DT_WSTR, 50)

Following is the expression to get the sub string and compare to "N" and return NULL if true

else the sub string string itself.

(DT_I4)((SUBSTRING(LTRIM(Answer),1,1) == "N") ? NULL(DT_WSTR, 50) : SUBSTRING(LTRIM(Answer),1,1))

Wednesday, May 15, 2013

SqlCmd : Error Cannot generate SSPI co ntext

Got the following error while trying to connect to SqlCmd of local machine.

Error Cannot generate SSPI co ntext

Searching online for the solution figured out that it has to do something with the network.

Workaround: Disable the network and try running the same command it works like charm.

Looking for the exact issue and better solution. Feel free to comment.

Sql Server: Using Sqlcmd to export data to text file

A SqlServerCentral friend was looking for a option to export data from Sql Server to a text file on periodic option. Refer the link below for details:

http://www.sqlservercentral.com/Forums/Topic1452185-1550-1.aspx
Adviced him to run the following sqlcmd in the job..
SQLCMD -S YourSqlServer -d YourDatabase -U YourUserName -P YourPassword -Q "Your Query" -s "," -o "C:\YourFileName.txt"
Feel free to post better work around.
I understand SSIS could be another option.

Tuesday, May 14, 2013