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danrega
2024-02-05 13:05:39 +01:00
parent ccc950a81c
commit 1b2238f2b6
7 changed files with 176 additions and 44 deletions
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05_Constructor_Expressions.md
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@@ -1507,25 +1507,68 @@ DATA(it11) = VALUE itab_type( FOR wa IN itab USING KEY primary_key ( col1 = wa-c
*ccct 9 13
"---------- Conditional iterations ----------
"Notes:
"- When used with VALUE/NEW for internal tables: New table lines are created in
" iteration steps and added to result
"- When used with REDUCE (as shown below): Reduction result is created in iteration steps
"- Regarding the THEN addition:
" - Must be specified if the iteration variable specified after FOR is not a numeric data
" type and not of type d/t
" - If the iteration variable is a numeric type/type d or t, THEN is optional. If THEN
" is not specified, the iteration variable is implicitly incremented by 1.
"FOR ... WHILE ...
"FOR ... WHILE ...
"Implicit incrementing of the iteration variable
DATA(it12) = VALUE itab_type( FOR x = 1 WHILE x < 4
( col1 = x col2 = x + 1 col3 = x + 2 ) ).
*COL1 COL2 COL3
* 1 2 3
* 2 3 4
* 3 4 5
* 1 2 3
* 2 3 4
* 3 4 5
"The following example corresponds to the previous one. Here, THEN
"is explicitly specified.
DATA(it13) = VALUE itab_type( FOR x = 1 THEN x + 1 WHILE x < 4
( col1 = x col2 = x + 1 col3 = x + 2 ) ).
"THEN explicitly specified
DATA(it14) = VALUE itab_type( FOR x = 1 THEN x + 2 WHILE x < 8
( col1 = x col2 = x + 1 col3 = x + 2 ) ).
*COL1 COL2 COL3
* 1 2 3
* 3 4 5
* 5 6 7
* 7 8 9
"THEN addition is required for non-numeric data types of the iteration
"variable
DATA(it15) = VALUE itab_type( FOR str = `x` THEN str && str WHILE strlen( str ) < 5
( col1 = str col2 = strlen( str ) + 1 col3 = strlen( str ) + 2 ) ).
*COL1 COL2 COL3
*x 2 3
*xx 3 4
*xxxx 5 6
"FOR ... UNTIL ...
"The THEN addition is also possible for ... WHILE ...
DATA(it13) = VALUE itab_type( FOR y = 31 THEN y - 10 UNTIL y < 10
DATA(it16) = VALUE itab_type( FOR y = 10 UNTIL y > 12
( col1 = y col2 = y + 1 col3 = y + 2 ) ).
*COL1 COL2 COL3
* 31 32 33
* 21 22 23
* 11 12 13
* 10 11 12
* 11 12 13
* 12 13 14
"THEN explicitly specified
DATA(it17) = VALUE itab_type( FOR y = 31 THEN y - 10 UNTIL y < 10
( col1 = y col2 = y + 1 col3 = y + 2 ) ).
*COL1 COL2 COL3
* 31 32 33
* 21 22 23
* 11 12 13
```
<p align="right"><a href="#top">⬆️ back to top</a></p>
@@ -1689,7 +1732,7 @@ DATA(it_val_2) = VALUE string_table(
*b: 7, 8 / 9, 10
*c: 11, 12
"Constucting a result using REDUCE
"Constructing a result using REDUCE
"The example is similar to the previous one by filling a string table.
"The example uses a group key expression specified after GROUP BY.
"In the group key expression, additional components of a structured