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  • How Many Records Did SQL Delete?

    February 4, 2004 Hey, Ted

    I have an RPG IV program with an embedded SQL DELETE statement. Is it possible for my program to determine how many records are deleted when the statement executes?

    –Tom

    DB2/400 returns this information to you through a subfield of the SQL communications area (SQLCA), a data area that is automatically included in your RPG program when you compile. You can refer to this subfield by either of two names: SQLERRD(3) or SQLER3. When a DELETE, UPDATE, or INSERT operation completes normally, DB2 updates the subfield with the number of rows that qualified for the operation.

    C/exec sql                              
    C+             delete from somefile   
    C+              where company = :company
    C/end-exec                              
     /free                                  
                if SQLER3 > *zero;          
    

    I understand that RPG is the only compiler that includes the SQLCA by default. According to the SQL Reference, the COBOL, C, PL/I, and FORTRAN programs must use the SQL INCLUDE command to reference the SQLDA. In the following short COBOL program, the SQLCA is included in the working-storage section.

    Identification division.                   
    Program-ID.    SQL005.                     
                                               
    Environment division.                      
                                               
    Data division.                             
    Working-storage section.                   
    01  Company     pic s999   packed-decimal. 
    01  EmptySet    pic x.                     
                                               
        Exec SQL include SQLCA end-exec.       
                                               
    Procedure division.                        
    Main-logic.                                
        Exec SQL                               
             set option commit=*none           
        end-exec.                              
        Exec SQL                               
             delete from qtemp/cuxt
              where company = 99   
        end-exec.                  
        if SQLERRD(3) > zero       
           move "N" to EmptySet    
        else                       
           move "Y" to EmptySet    
        end-if.                    
        goback.                    
    

    For more information about the SQLCA, consult the DB2 reference on IBM’s Web site.

    –Ted

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