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This enables us to take the actions sequentially e.g., perform an update on a single row. The SQL Server cursor is T-SQL logic, which allows us to loop through the related query result.
#Tsql cursor code#
You can also supply logic to move back in forth in the cursor, etc. Before we move to code and examples, we should explain what SQL Server cursors are. Once you are finished with the first record then you it will check for a new value. You can even Convert the out put, put in conditional logic, etc. This displays the assignto field from OtherTable Select Can Use the values to build a new query or look up additional values This will display the the first row an on and on We need to make containers for the Cursor Info Where EVENT in ('Reboot_System', 'Failed_Login','Failed_Service')ĮventDate Between and My_Cursor - (remember to CLOSE IT LATER) We can do a complex SQl Statement with 16 joins We need to Tell the System what it is for Let's set a range for the system to lookup eventsĭECLARE MY_CURSOR Cursor - We need to name It! you can compile it as a stored proceedure This is optional, the cursor can run as a script or
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You can assign a cursor to a variable or parameter with. The FOR LOOP is used by the cursor for carrying out the repetitive task of processing the records retrieved from the cursor reference. Opening a cursor on a result set allows processing the result set one row at a time. PL/SQL cursor loop statement is used for fetching and processing each and every record one by one which is referred to by a cursor. Microsoft SQL Server statements produce a complete result set, but there are times when the results are best processed one row at a time. OtherTable.Eventid to Primary Key SomeTable.id. Applies to: SQL Server (all supported versions) Azure SQL Database. The two table( If they were real) would be joined by # -ĮventDate datetime DEFAULT ' 00:00:00' NOT NULL, 2000, 2005, 2008 Updated 1-29-2009 If you need to perform a JOIN as part of your cursor, keyset and static cursors are generally faster than dynamic cursors, and should be used when possible. (The tables are actually from MySQL – I was lazy.) The smaller the cursor, no matter what type of server-side cursor it is, the fewer resources it will use, and performance will benefit. We will use a two tables named SomeTable and Other Table The record count is calculated using the DESCRIBE TABLE command Mode 2 Result Mode 3: Multiple Cursor, Single Process into Work Area. You can return output to build a cleaner report output, etc.Example Select 'Case Created: '+convert(Varchar(20), ) + ' Case Number: '+ convert(varchar(10), will start with the basic frame work and build from that: When a cursor isupdatable it means that the cursor maintains alink to the. I use them for such things as building the body of an automated email with a cursor set within a stored proceedure. This makes the TSQL cursor even more expensive as far as performance is concerned.
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It allows you to take a subset of data and output the information in various ways. ARTICLE FROM ORIGINAL SITE – Young and Dumb!ĭatabase Cursors have long been a favorite of mine.