ABAP Keyword Documentation → ABAP - Reference → Processing Internal Data → Internal Tables → Processing Statements for Internal Tables → MODIFY itab → MODIFY itab - itab_line
MODIFY itab - index
Other versions: 7.31 | 7.40 | 7.54
Syntax
... { itab INDEX idx [USING KEY keyname] }
| { itab [USING KEY loop_key]} ... .
Alternatives
1. ... itab INDEX idx [USING KEY keyname]
2. ... itab [USING KEY loop_key]
Effect
These alternatives specify the rows to be changed using the specification of a row number relating to a table index.
Alternative 1
... itab INDEX idx
Addition
Effect
If the INDEX addition is used, the MODIFY statement
modifies the row of the row number specified in idx with respect to a table index. idx is a
numerical expression
position of the operand type i. If idx contains a value of 0 or less, an exception is raised that cannot be handled.
If the addition USING KEY is not used, the addition INDEX can only be used with
index tables and determines the row to be modified from the
primary table index.
If a row specified using INDEX is modified without the addition
TRANSPORTING, then all components of the row are transported. If at the same time it is statically determinable that write-protected
secondary table keyswould
be overwritten by this, this leads to a syntax error. If it can only be determined at runtime, the corresponding runtime error occurs.
If the components of a primary sorted table key are modified in a row specified using INDEX, however, a runtime error occurs only if the value of the component changes.
Note
The addition INDEX can also be positioned after FROM wa.
Example
Conversion of an airline's local currency to euro in internal table scarr_tab by accessing the index.
PARAMETERS p_carrid TYPE scarr-carrid.
DATA scarr_tab TYPE SORTED TABLE OF scarr
WITH UNIQUE KEY carrid.
DATA: idx TYPE sy-tabix,
scarr_wa TYPE scarr.
SELECT *
FROM scarr
INTO TABLE scarr_tab.
READ TABLE scarr_tab
WITH TABLE KEY carrid = p_carrid
TRANSPORTING NO FIELDS.
idx = sy-tabix.
scarr_wa-currcode = 'EUR'.
MODIFY scarr_tab INDEX idx FROM scarr_wa
TRANSPORTING currcode.
Addition
... USING KEY keyname
Effect
If the addition USING KEY is used, a table key can be declared in keyname to declare the table index to be used explicitly.
If the table has a sorted
secondary key, this can be specified in keyname. The row to be modified is then determined from its
secondary table index. You cannot declare a secondary
hashed key.
If the primary table
key is specified under the name primary_key, the table must be an index table, and the behavior is the same as when USING KEY is not specified.
Note
If a sorted secondary key exists, the INDEX addition can be used for all table types, if USING KEY is used.
Alternative 2
... itab
Addition
Effect
This variant is only possible within a LOOP
across the same internal table. The current table row of the LOOP is modified
implicitly. If the addition USING
KEY is specified in LOOP, then the variant USING KEY loop_key must be specified for this variant.
If the current rows were already deleted in the same loop pass, then the behavior is undefined.
This variant is not allowed outside of a LOOP and raises a warning in the syntax check, if the check cannot detect (statically) its presence in a loop.
Note
We do not recommend that you use this alternative. Instead, use the INDEX addition to specify the row number explicitly.
Addition
... USING KEY loop_key
Effect
This addition is required if the table key used by the LOOP is specified
explicitly in the statement LOOP. It states explicitly that the current table
row is modified by the LOOP. No other key can be specified apart from the
predefined name loop_key.
If no explicit table key is specified for LOOP, then the addition USING KEY loop_key is optional.