Quick view of a database file structure

Quick view of a database file structure

This command is useful to see the summary of fields of a database file. You can see all information related to a field, and this needs only one line per field. This is a very compact view of a database file in a green screen.

Command syntax: FD |[libary name]/|[file name]

If you put only the file name, the library name is searched for on current library list. 


 You need the following object in library QGPL: 

FD        *QMQRY
FD        *PGM
FD        *CMD

The output is derived from a system file QADBIFLD  in QSYS library.

=======================================

Create a Query manager query (use STRQM command): 

 
SELECT                                  

DBIFLD,                                 

DECIMAL(DBICLN,4,0) AS CLENGTH,            
DBINLN AS NLENGTH, DBINSC AS NSCALE,       
SUBSTR(DBITXT,1,30) AS FTEXT, DBIITP,      
DBIILN, DBITYP, DBIPOS                     
                                    
FROM QADBIFLD                              

WHERE DBILIB= &LIB and DBIFIL= &FILE       

=======================================

Create a CL program to utilize the query above:

PGM        PARM(&QNAME)                                  
 DCL &FILE  *CHAR 10                                     
 DCL &LIB  *CHAR 10                                      
 DCL &QNAME *CHAR 20                                     
 DCL &FILEC *CHAR 12

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 DCL &LIBC *CHAR 12                                      
CHGVAR &FILE %SST(&QNAME 1 10)                           
CHGVAR &LIB  %SST(&QNAME 11 10)                          
CHKOBJ     OBJ(&LIB/&FILE) OBJTYPE(*FILE) MBR(*FIRST)    
MONMSG     MSGID(CPF9801 CPF9810) EXEC(GOTO CMDLBL(END)) 
IF         COND(&LIB = '*LIBL') THEN(RTVMBRD +           
             FILE(&FILE) RTNLIB(&LIB))                   
CHGVAR &FILEC (''''||&FILE||'''')                        
CHGVAR &LIBC  (''''||&LIB||'''')                         
STRQMQRY   QMQRY(*LIBL/FD) SETVAR((LIB &LIBC) +    
             (FILE &FILEC))                              

END:
ENDPGM

=======================================

Create a command to call the CL program above:

            CMD        PROMPT('File Description Query')            
            PARM       KWD(FILE) TYPE(NAME1) MIN(1) CHOICE('Name') 
                         PROMPT('File')                            
NAME1:      QUAL       TYPE(*NAME) LEN(10) MIN(1)                  
            QUAL       TYPE(*NAME) LEN(10) DFT(*LIBL) +            
                         SPCVAL((*LIBL))

This was first published in August 2001

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