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What is package versioning? Please give an example.
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Answer Posted / mani
Versioning allows multiple packages that share both the
schema and Package ID to co exist in the system catalogs.
A sample application called payroll is compiled from
payroll.sqc.This application would be precompiled and the
package payroll bound to the database and the application
delivered to the users.users then could run the application
in production.
If the application required modification (even without sql
changes) the process of recompiling,binding and sending the
application to the users must be repeated.If the version
option was not specified for this second precompilation of
payroll, the first package is replaced by second package.
Any user who attempts to run the old version of application
would get -818 error.To avoid this use VERSION and it allows
both versions of the appliction to run at the same time.
When the first version of Payroll was created, the version
option should be used during the precompilation step.
DB2 PREP PAYROLL.SQC VERSION V1.1
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SET is the ANSI standard for variable assignment, SELECT is not. SET can only assign one variable at a time, SELECT can make multiple assignments at once. If assigning from a query, SET can only assign a scalar value. If the query returns multiple values/rows then SET will raise an error. SELECT will assign one of the values to the variable and hide the fact that multiple values were returned (so you'd likely never know why something was going wrong elsewhere - have fun troubleshooting that one) When assigning from a query if there is no value returned then SET will assign NULL, where SELECT will not make the assignment at all (so the variable will not be changed from it's previous value) As far as speed differences - there are no direct differences between SET and SELECT. However SELECT's ability to make multiple assignments in one shot does give it a slight speed advantage over SET.
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