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Command title |
Get Previous |
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Description |
This command decrements the COUNT field of the xxxx-COMMAND-AREA by 1 and then retrieves the row with that subscript to the xxxx-ROW-AREA. |
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COBOL syntax |
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C syntax |
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Parameters |
xxxx-ROW-AREA |
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Explanation |
Automatic open of the table causes COUNT to be set to zero; GP will then decrement that, resulting in a non-existent row pointer. |
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Return value |
If the table is empty or the resulting COUNT designates a non-existent row, FOUND is set to N and ERROR code set to zero. If the row is found, FOUND is set to Y. |
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Notes |
GP can be used in conjunction with Date-Sensitive Processing. In a multi-tasking or multi-user online environment, results for commands that utilize a count or sequential accessing of table rows may get unexpected results if another task/user is updating or deleting rows in the same table. |
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Exceptions |
With HASH-EMPTIES-RETURNED set to N, tableBASE suppresses the return of empty rows for tables which have a Hash organization. See Change Status (CS) for additional information on HASH EMPTIES. |
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See also |
- Notices
- Preface
- Audience for this Guide
- What you should know to use this Guide
- What is covered in this Guide
- What’s new in Version 7
- Features from Version 6
- Naming protocol
- Conventions Used in this Guide
- Glossary
- Additional tableBASE references
- VTS Manager References
- Customer Support
- Training and Professional Services
- About DataKinetics
- Introduction
- tableBASE basics
- tableBASE
commands
- Retrieval commands
- Update commands
- Table control commands
- Library maintenance commands
- System control commands
- tableBASE command descriptions
- Allocate (AL)
- Banner Retrieval (BN)
- Create Alternate Index Definition (CA)
- Change Table Definition (CD)
- Change Generations (CG)
- Close Table (CL)
- Change Name (CN)
- Change Status (CS)
- Delete by Count (DC)
- Dump Definition (DD)
- Disengage (DE)
- Delete Generation (DG)
- Delete by Key (DK)
- Define New Library (DL)
- Define Table (DT)
- Dump Table Contents (DU)
- Divert (Non-existing) Table (DV)
- Divert (Existing) Table (DW)
- Fetch by Count (FC)
- Fetch Generic (FG)
- Fetch by Key (FK)
- Fetch Next by Key (FN)
- Get Table Definition (GD)
- Get First (GF)
- Get Last (GL)
- Get Next (GN)
- Get Previous (GP)
- Invoke Alternate Index (IA)
- Insert by Count (IC)
- Insert by Key (IK)
- List Directory (LD)
- List Library (LL)
- List Status (LS)
- List Open Tables (LT)
- List VTS Settings (LV)
- Modify Library Search Order (ML)
- Empty the Table (MT)
- Get Next Table Name (NX)
- Open for Read (OR)
- Open for Write (OW)
- Replace by Count (RC)
- Refresh Table (RF)
- Replace by Key (RK)
- Release Table (RL)
- Rename Table (RN)
- Set Indirect (SI)
- Search by Key (SK)
- Store Table (ST)
- Un-allocate (UL)
- Virtual Subsystem (VS)
- Vary VTS (VV)
- Eliminate Table (XT)
- Terminate tableBASE in Region (XX)
- tableBASE error codes
- tableBASE
parameter description
- ALT-DEFINITION (12 bytes)
- COMMAND-AREA (72 bytes)
- 1. COMMAND (2 bytes)
- 2. TABLE (8 bytes)
- 3. FOUND (1 byte)
- 4. INDIRECT-OPEN (1 byte)
- 5. FILLER (1 byte)
- 6. ABEND-OVERRIDE (1 byte)
- 7. ERROR (halfword binary)
- 8. COUNT (fullword binary)
- 9. LOCK-LATCH (8 bytes)
- 10. ROW-OVERRIDE-LENGTH (fullword binary)
- 11. ROW-ACTUAL-LENGTH (fullword binary)
- 12. FG-KEY-LENGTH (halfword binary)
- 13. FUNCTION-ID (halfword binary)
- 14. FUNCTION-AREA: DATE (8 bytes)
- 16. START-TBUOW (1 byte)
- 15. FILLER (19 bytes)
- 17. RETURNED-ABS-GEN-NO (halfword binary)
- 18. ERROR-SUBCODE (halfword binary)
- DATA-TABLE-NAME (8 bytes)
- DDNAME (8 bytes)
- DEFINITION-BLOCK (256 bytes)
- 1. ORG (1 byte)
- 2. METHOD (1 byte)
- 3. INDEX (1 byte)
- 4. SMC (1 byte)
- 5. RPSWD (8 bytes)
- 6. WPSWD (8 bytes)
- 7. RSZ (fullword binary)
- 8. KSZ (fullword binary)
- 9. KLOC (fullword binary)
- 10. ROWS (fullword binary)
- 11. GENERATIONS (halfword binary)
- 12. EXP-FACT (halfword binary)
- 13. LO-DEN (halfword binary)
- 14. HI-DEN (halfword binary)
- 15. FILLER (6 bytes)
- 16. DATE (12 bytes)
- 17. ABS-GEN-NO (halfword binary)
- 18. DATASET-NAME (44 bytes)
- 19. REL-GEN-NO (halfword binary)
- 20. GENS-PRESENT (halfword binary)
- 21. ROWS-AT-EXPAND (fullword binary)
- 22. DDNAME (8 bytes)
- 23. DATA-TABLE (8 bytes)
- 24. OPEN-STATUS (1 byte)
- 25. ALTS-INVOKED (1 byte)
- 26. VIEW-VERSION (1 byte)
- 27. FILLER (1 byte)
- 28. USERID (8 bytes)
- 29. VIEW-NAME (8 bytes)
- 30. VIEW-DATE (12 bytes)
- 31. USER-COMMENTS (16 bytes)
- 32. VTSNAME (8 bytes)
- 33. FILLER (68 bytes)
- DIR-SPEC (9 bytes)
- GENERATION (fullword binary)
- INDIRECT-OPEN-CRITERION (50 bytes)
- KEY-AREA (Table Specific)
- LIB-LIST (80 bytes)
- LIB-SPACE (8 bytes)
- LIBRARY-ALLOC (45 bytes)
- LIST-BLOCK (88 bytes)
- 1. LIST-FROM (fullword binary)
- 2. LIST-REQD (fullword binary)
- 3. LIST-SIZE (fullword binary)
- 4. LIST-TOTAL (fullword binary)
- 5. LIST-RETURNED (fullword binary)
- 6. LIST-TSR-HW (fullword binary)
- 7. LIST-OPEN-HW (fullword binary)
- 8. LIST-OPEN-NOW (fullword binary)
- 9. LIST-TSR-NOW (fullword binary)
- 10. LIST-TSR-SZ (fullword binary)
- 11. LIST-STROBE (fullword binary)
- 12. LIST-TOTAL-HWM (fullword binary)
- 13. LIST-TOTAL-CALLS (doubleword binary)
- 14. LIST-MAX-TBLS (fullword binary)
- 15. FILLER (16 bytes)
- 16. LIST-TSR-AVAIL (fullword binary)
- 17. FILLER (8 bytes)
- NAME-AREA (256 bytes)
- NEW-GEN-NO (fullword binary)
- NEW-TABLE-NAME (8 bytes)
- PASSWORD (8 bytes)
- RELEASE-LEVEL (16 bytes)
- ROW-AREA (Table Specific)
- STATUS-SWITCHES (8 bytes)
- TABLE-AREA
- TABLE-STATS
- 1. TABLE-NAME (8 bytes)
- 2. TABLE-OPEN-STATUS (1 byte)
- 3. TABLE-LOCAL-VTS (1 byte)
- 4. TABLE-ALT-INVOKED (1 byte)
- 5. FILLER (1 byte)
- 6. TABLE-CALLS (fullword binary)
- 7. TABLE-SIZE (fullword binary)
- 8. TABLE-ROWS (fullword binary)
- 9. TABLE-RWS-BF-EXP (fullword binary)
- 10. TABLE-DATATBL-VTSNAME (8 bytes)
- 11. TABLE-UPDATE-CALLS-TRUNC (fullword binary)
- 12. TABLE-DATE-TIME (12 bytes)
- 13. FILLER (4 bytes)
- 14. TABLE-TOTAL-CALLS (doubleword binary)
- 15. TABLE-UPDATE-CALLS (doubleword binary)
- 16. TABLE-VTSNAME (8 bytes)
- TBACC-DEF (32 bytes)
- TBINDEX-DEF (32 bytes)
- TB-PARM V5 (64 bytes)
- TB-PARM V4 (28 bytes)
- VTS-DATA (60 bytes)
- 1. FILLER (8 bytes)
- 2. VTS-VTSFIRST (8 bytes)
- 3. VTS-VTSLAST (8 bytes)
- 4. VTS-VTSNAME (8 bytes)
- 5. VTS-DEFAULT-TSR (8 bytes)
- 6. VTS-TSRACCESS (1 byte)
- 7. VTS-RACF-VTS (1 byte)
- 8. VTS-TSR-KEY-PROTECT (1 byte)
- 9. FILLER (3 bytes)
- 10. VTS-GENERATION (2 bytes)
- 11. VTS-TPVM (8 bytes)
- 12. VTS-PREFIX (4 bytes)
- VTS-NAME (8 bytes)
- tableBASE parameters with C
- tableBASE coding examples
- Summary of coding examples
- Coding conventions
- Programming in C with tableBASE
- Retrieval commands
- Update commands
- Table control commands
- Library maintenance commands
- System control commands
- Sample tableBASE applications
- Fetch a row from a table
- Update an existing table
- Sequentially process all rows in a table
- Generic search
- Define a dynamic table to summarize data in memory
- Access a table that may not exist
- Establish another key with which to search a table
- Concatenate tableBASE libraries
- Temporarily change a list of concatenated tableBASE libraries
- Access a table indirectly
- Other language examples
- Environmental interfaces
- Customizing tableBASE options
- tableBASE driver command processor for CICS
- TBDRIVER command processor for Batch/TSO
- Error diagnosis
- tableBASE subroutines
- tablesONLINE/ISPF exit programming
- tablesONLINE/CICS exit programming
- Interacting with tablesONLINE/CICS
- Top-level control structure for an exit
- Before Action exits
- After Action exits
- tablesONLINE/CICS system exits
- Command Line/Line Command processing exits
- BYPASS-ACTION-IND summary
- Constructing an exit program
- The EXITWS copybook
- The EXITPARM copybook
- Exit program scenarios
- tableBASE run-time options
- ALLOW_TB_LIB_IO—Allow tableBASE Library I/O
- CICSJRNL—CICS Journal File ID
- DATERTNX—Date-Sensitive Processing Found Code
- FGDELIM—Fetch Generic Delimiter
- HASH_HI_DEN_LIM—High Density Limit for Hash Indexes
- HASH_LOW_DEN_LIM—Low Density Limit for Hash Indexes
- LDS—Linear Data Set Use
- LIBnn, ML—tableBASE Library List
- LISTOPTIONS—List Parameter Options
- LOCKTIMERC—Lock Timer Wait Value
- LOCKTIMEWTO—Lock Timer Message Wait Value
- MAXNMTAB—Maximum Number of Tables
- MTRETAIN—Retain Rows and Index Areas
- MULTITASKING—Multitasking
- MULTOPNX—Multiple Alternate Index
- OVRRIDES—Allow Changes to Status Switches
- RACF_LIBACCESS—Perform Checks on Protected Libraries
- RACF_VTS—Perform Checks on SAF Interface Protected VTS-TSRs
- STROBE—Strobe Interval
- STROBEMETHOD—Strobe Method
- SUPPRESS_DUMPS—Suppress tableBASE Messages and Dumps
- SWITCHES—Status Switches
- TABLEWAITRC—Table Open Enqueue Wait Time
- TABLEWAITWTO—Table Open Enqueue Report Time
- TPVM—VTS Group Manager Use
- TSR_ALGORITHM—Optimize TSR Usage
- TSR_KEY_PROTECT—Hardware Key Protection for VTS-TSRs
- TSR_WARNING_FREQ—Frequency of TSR Allocation Warnings
- TSR_WARNING_PCT—Percentage of TSR Allocation for Warning Activation
- TSRACCESS—Read Only (RO) or Read Write (RW) TSR Access
- TSRSIZE—tableSPACE Region Size
- USEREXITS—User Exits
- VTSFIRST, VTSLAST—VTS Search Sequence
- VTSNAME—Specifying the Name of a VTS-TSR
- VTSPREFIX—VTS Prefix Definition
- ZEROROWS—Zero Data Table Rows on De-allocation
- TBOPT dataset coding
- Hints and suggestions
- tableBASE space requirements
- FK for duplicate keys
- Optimizing table access
- High-speed processing without EDF
- Date-sensitive processing
- Access Register mode
- VSAM tableBASE libraries and LSR pools
- Considerations for working with large tables
- tableBASE libraries
- Linked tables and TB-PARM
- Performance and TB-PARM
- Application performance with TBASEV or TBCALLV
- Limitations of duplicate key support
- Compatibility with previous releases of tableBASE
- tableBASE messages
- Sample tableBASE COBOL call template
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