File Management - IBM

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Program A (in user default activation group) Call Level 2 OVRPTRF FILE(YYY) FOLD(*YES) OVRSCOPE(*CALLLVL) CALL PGM B Call Level 3 Program B (in activation group 8) OVRPTRF FILE(ZZZ) TOFILE(YYY) DEV(P1) LPI(6) + OVRSCOPE(*CALLLVL) CALL PGM C Call Level 4 Program C (in user default activation group) OVRPTRF FILE(ZZZ) CPI(12) OVRSCOPE(*CALLLVL) CALL PGM D Call Level 5 Program D (in activation group 21) OVRPTRF FILE(YYY) DEV(P2) OVRSCOPE(*JOB) CALL PGM E Call Level 6 Program E (in activation group 21) OVRPTRF FILE(ZZZ) LPI(12) OVRSCOPE(*ACTGRPDFN) CALL PGM F Call Level 7 Program F (in activation group 8) OVRPTRF FILE(ZZZ) LPI(9) OVRSCOPE(*CALLLVL) CALL PGM G Call Level 8 Program G (in activation group 8) OVRPTRF FILE(ZZZ) DUPLEX(*NO) + OVRSCOPE(*ACTGRPDFN) CALL PGM H Call Level 9 Program H (in activation group 8) OVRPTRF FILE(YYY) LPI(5) OVRSCOPE(*ACTGRPDFN) CALL PGM I Call Level 10 Program I (in activation group 8) OPEN FILE(ZZZ) Figure 6. Example of Override Processing in Multiple Activation Groups 44 File Management V4R5 When program I opens file ZZZ, file ZZZ has the following attributes: CPI(12) From call level 4 FILE(YYY) From call level 3 LPI(5) From call level 9 FOLD(*YES) From call level 2 DEV(P2) From call level 5 The system processes the overrides in the following order: 1. File ZZZ opens at call level 10. The system looks for any overrides issued at call level 10 that were scoped to the call level. There are no such overrides. 2. The system searches the next previous call level (level 9) for applicable overrides that were scoped to the call level. There are no such overrides. (The override issued in call level 9 is for file YYY and does not apply.) 3. The system searches call level 8 for applicable overrides that were scoped to the call level. There is an override for file ZZZ; however, it is scoped to the
activation group level. The system does not process this override until it has processed all overrides with call levels greater than or equal to the call level of the oldest procedure in activation group 8. In this example, the call level of the oldest procedure in activation group 8 is 3. Therefore, the system will process all call level overrides that are issued at call levels greater than or equal to 3 before processing the activation group override that is issued at call level 8. 4. The system searches call level 7 for applicable overrides that were scoped to the call level. Because the override issued at call level 7 is scoped to the call level, it is processed. The LPI(9) attribute is assigned to file ZZZ. 5. The system searches call level 6 for applicable overrides that were scoped to the call level. Notice that call level 6 is in activation group 21. There is an override for file ZZZ; however, it is scoped to the activation group level of activation group 21. The system ignores this override altogether because it is scoped to an activation group other than activation group 8. 6. The system searches call level 5 for applicable overrides that were scoped to the call level. There are no such overrides. (The override issued in call level 5 is for file YYY and does not apply.) 7. The system searches call level 4 for applicable overrides that were scoped to the call level. Because the override issued at call level 4 is scoped to the call level, it is processed. The CPI(12) attribute is assigned to file ZZZ. 8. The system searches call level 3 for applicable overrides that were scoped to the call level. Because the override issued at call level 3 is scoped to the call level, it is processed. Notice that the file being opened has been changed to YYY from ZZZ. The DEV(P1) attribute is assigned to file YYY. The LPI(9) attribute is changed to LPI(6) and is assigned to file YYY. Call level 3 is the call level of the oldest procedure in activation group 8. Therefore, any overrides (for file YYY) that were scoped to the activation group level of activation group 8 are processed. The override issued at call level 9 is processed. This changes the LPI(6) attribute to LPI(5). 9. The system searches call level 2 for applicable overrides that were scoped to the call level. The override issued in call level 2 is processed. This assigns the FOLD(*YES) attribute to file YYY. 10. The system searches call level 1 for applicable overrides that were scoped to the call level. There are no such overrides. 11. The system searches the job level for applicable overrides that were scoped to the job level. Because, the override issued in call level 5 was scoped to the job level and it is for file YYY, it is processed. This changes the DEV(P1) attribute to DEV(P2). How the system processes overrides-scenario 2 When several overrides that override the file type to be used by a program are applied, only the attributes specified on the overrides of the same type as the final file are applied. In the following example, assume that program MAKEMASTER attempts to open the diskette file DKA: Chapter 3. Using overrides 45
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AS/400e File Management Version 4
Page 4 and 5: © Copyright International Business
Page 6 and 7: | | | | | Special considerations fo
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Page 14 and 15: Table 1. File Types and Their Main
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Page 20 and 21: Add Add new records to the file. Up
Page 22 and 23: | Sharing files 12 File Management
Page 24 and 25: 14 File Management V4R5 For example
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Page 64 and 65: Deleting overrides 54 File Manageme
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Page 74 and 75: Redirecting files 64 File Managemen
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Page 80 and 81: Copying files: overview 70 File Man
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Page 84 and 85: Table 10. Summary of Copy Functions
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Page 88 and 89: Resending copy file completion mess
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94 File Management V4R5 Selecting r
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96 File Management V4R5 Example: bu
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98 File Management V4R5 When you sp
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100 File Management V4R5 A field na
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102 File Management V4R5 v “Null-
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104 File Management V4R5 - INCCHAR(
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When you specify PRINT(*EXCLD), the
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Note: It is possible for files with
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110 File Management V4R5 Variable-L
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Table 14 on page 112 outlines the c
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114 File Management V4R5 in the cur
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116 File Management V4R5 (including
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Preventing errors when copying file
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elationship. However, the copy oper
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Preventing allocation errors when c
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128 File Management V4R5 - A depend
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Year 2000 support: date, time, and
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FLD TYPE DATFMT SPECIFIED FIELD LEN
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Restrictions for Year 2000 support
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| | | | | | | | | | AS/400 supports
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Using the Copy From Import File (CP
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externally described database file
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144 File Management V4R5 v Two adja
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- Description: This Field Definitio
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Date Fields All date formats suppor
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150 File Management V4R5 Figure 14
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devices that process the same type
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Default system output queues 154 Fi
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Spooling writers 156 File Managemen
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value of *OWNER indicates that only
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160 File Management V4R5 You can us
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162 File Management V4R5 QFNC Finan
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164 File Management V4R5 If a job b
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Spooling subsystem 166 File Managem
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168 File Management V4R5 the DLTSPL
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Table 20. Open Feedback Area (conti
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Table 20. Open Feedback Area (conti
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Table 21. Device Definition List (c
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Table 23. Common I/O Feedback Area
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Table 24. I/O Feedback Area for ICF
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Table 24. I/O Feedback Area for ICF
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Table 26. I/O Feedback Area for Dat
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Table 27. Get Attributes (continued
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(SBCS) A B 1 2 1-Byte Code X’C1
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200 File Management V4R5 Table 28.
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Invalid double-byte code and undefi
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DBCS device file support 204 File M
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206 File Management V4R5 - Create D
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DBCS display support 208 File Manag
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210 File Management V4R5 When you c
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DBCS font tables 212 File Managemen
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214 File Management V4R5 CPYIGCTBLI
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DBCS font files DBCS sort tables 21
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Finding out if a DBCS sort table ex
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220 File Management V4R5 v When you
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User-created dictionary for DBCS 22
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Work with DBCS conversion dictionar
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another alphanumeric entry in the e
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Figure 22. Display Produced by the
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230 File Management V4R5 1. Positio
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Figure 23. Example Screen 1 Positio
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Figure 27. Example Screen 5 234 Fil
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236 File Management V4R5 - If you t
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contains information on data descri
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240 File Management V4R5
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CHGWTR (Change Writer) command 157
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command, CL 160, 212 (continued) Tr
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DBCS conversion dictionary (continu
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file object authority 8 file proces
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output queue (continued) changing 1
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estriction DBCS files 206 deleting
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WRKOUTQD (Work with Output Queue De
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