Updating a row in db2 Calgary chat xxx live free
As said earlier there are no changes in declare, open & close statement syntax. Ex: Here we can specify either WITH ROW-SET POSITIONING or WITHOUT ROW-SET POSITIONING . 2) Open the cursor , it is same as normal cursor open statement.
3) Fetch the cursor with row-set option Here there are multiple options while fetching Fetch FIRST-ROWSET – Fetches first 10 rows Fetch NEXT-ROWSET – fetches next 10 rows We can also have the PRIOR-ROWSET, CURRENT-ROWSET, LAST-ROWSET & ROWSET STARTING AT options.
The size of the array depends on your requirement (if you need 10 rows at a time, declare the array with 10 occurrence).
If id and name are not unique then it may update duplicate records which are not processed yet.
Like in this case (id = 1 and name = SUMIT) is not unique so when 1st record of result table is processed it will also update 3rd record without processing it.
This is called POSITIONED UPDATE or POSITIONED DELETE.
Let say there is a table EXAMPLETABLE like This will word fine if EXAMPLETABLE table has unique records for id and name and you have to fetch all the columns of the row which make that row unique to use in WHERE clause of UPDATE statement.
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I have a table that is used as a work queue and many threads and read/update it. First it reads the ID's of available jobs, then it reserves them and gets the info.