Scalable Database Server, HiRDB Version 8 Command Reference

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8.10.5 Example of a UOC

This section presents an example of table reorganization using a UOC.

The example of UOC coding shown here is provided as a sample database. It is stored in the directory %PDDIR%\sample\sampleUOC.

Organization of this subsection
(1) Example of table reorganization using a UOC

(1) Example of table reorganization using a UOC

During table reorganization, this example deletes data whose database registration date is year 2001 or earlier.

(a) Database table definition
 
  CREATE TABLE MEMBVER_DIRECTORY (MEMBER_NUMBER INTEGER,
                     MEMBER_NAME NCHAR(20),
                     MEMBER_ADDRESS NVARCHAR(100),
                     JOINED_DATE_AND_TIME DATE NOT NULL WITH DEFAULT);
(b) Command format
 
 pdrorg -k rorg -t MEMBVER_DIRECTORY control-information-file
(c) Contents of control information file
 
 unload unload-data-file-name uoc_lib=library-name
 unlduoc entry=old_data_delete
(d) Example of UOC coding
 
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <pdutluoc.h>   ..........................................................1
 
void old_data_delete (
    UTL_UOC_INF         *uocinf             /* A(UOC interface area)      */   ...2
) {
    UTL_UOC_DATA_BUF    *addr_list;         /* A(data address list)       */
    unsigned char       *date_adr;          /* A(DATE)                    */
    static unsigned char cyear[2];          /* compare year               */
 
    switch(uocinf->req_cd){   ....................................................3
    case UTL_UOC_START:
/*[Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure]*/
/*  START                                                                 */
/*[Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure]*/
        cyear[0] = 0x20;                    /* The 21st century           */
        cyear[1] = 0x01;                    /* (2001)                     */
        uocinf->rtn_code = UTL_UOC_NML;
        break;
    case UTL_UOC_EDIT:
/*[Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure]*/
/*  EDIT                                                                  */
/*[Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure]*/
        addr_list = uocinf->data_adr;
        date_adr = addr_list->data[3];
        if (memcmp(date_adr,cyear,sizeof(cyear)) < 0){
            uocinf->unload_flg = UTL_UOC_ROWNOPUT;
        }else{
            uocinf->unload_flg = UTL_UOC_ROWPUT;
        }   ......................................................................4
        uocinf->rtn_code = UTL_UOC_NML;
        break;
    case UTL_UOC_END:
    case UTL_UOC_TERM:
/*[Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure]*/
/*  END                                                                 */
/*[Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure] [Figure]*/
        uocinf->rtn_code = UTL_UOC_NML;
        break;
    default:
        strcpy(uocinf->err_msg,"Invalid request code");
        uocinf->rtn_code = UTL_UOC_ERR;
    }
    return;
}

Explanation:
  1. Includes the header for UOC creation that is provided by HiRDB.
  2. Receives the address of the UOC interface area as an argument.
  3. Checks the call type and executes appropriate processing.
  4. Checks the data (date) and sets the storage flag.

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