By specifying SET OPTION DBGVIEW = *SOURCE in your Create SQL Procedure, Create SQL Function, or Create Trigger statement, you can debug the generated program or module at the SQL statement level.
You can also specify DBGVIEW(*SOURCE) as a parameter on a RUNSQLSTM command and it will apply to all routines within the RUNSQLSTM.
The source view will be created by the system from your original routine body into source file QSQDSRC in the routine library. If the library cannot be determined, QSQDSRC is created in QTEMP. The source view is not saved with the program or service program. It will be broken into lines that correspond to places you can stop in debug. The text, including parameter and variable names, will be folded to uppercase.
All variables and parameters are generated as part of a structure. The structure name must be used when evaluating a variable in debug. Variables are qualified by the current label name. Parameters are qualified by the procedure or function name. Transition variables in a trigger are qualified by the appropriate correlation name. It is highly recommended that you specify a label name for each compound statement or FOR statement. If you don't specify one, the system will generate one for you. This will make it nearly impossible to evaluate variables. Remember that all variables and parameters must be evaluated as an uppercase name. You can also eval the name of the structure. This will show you all the variables within the structure. If a variable or parameter is nullable, the indicator for that variable or parameter immediately follows it in the structure.
Because SQL routines are generated in C, there are some restrictions in C that also affect SQL source debug. Delimited names that are specified in the SQL routine body cannot be specified in C. Names are generated for these names, which again makes it difficult to debug or eval. In order to eval the contents of any character variable, specify an * prior to the name of the variable.
Since the system generates indicators for most variable and parameter names, there is no way to check directly to see if a variable has the SQL null value. Evaluating a variable will always show a value, even if the indicator is set to indicate the null value.
In order to determine if a handler is getting called, set a breakpoint on the first statement within the handler. Variables that are declared in a compound statement or FOR statement within the handler can be evaluated.