ABAPMODIFY_DBTAB - MODIFY DBTAB

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MODIFY dbtab

Short Reference

MODIFY target $[ connection$] FROM source $[MAPPING FROM ENTITY$].

Effect

The statement MODIFY inserts one or more rows specified in source into the DDIC database table or DDIC table view specified in target, or overwrites existing rows. The addition connection can be used to specify a secondary connection.

The addition MAPPING FROM ENTITY is used to handle structures and internal tables that are typed with BDEF derived types. Find more information in the topic ABAP SQL Statements with MAPPING FROM ENTITY.

System Fields

The statement MODIFY sets the values of the system fields sy-subrc and sy-dbcnt.

sy-subrc	Meaning
0	When a work area was specified in source, the specified row was inserted or modified. When an internal table was specified in source, all specified rows were inserted or modified, or the internal table is empty.
2	When a LOB handle structure was specified with a component for writer streams, the non-LOB handle components were not yet written to the database, and instead are passed when the stream is closed, at the latest. Whether this situation occurs or not depends on the database. See LOB handles.
4	When a work area or a subquery was specified in source, no rows were processed, or when an internal table was specified in source, not all specified rows were processed because there is already a row with the same unique secondary index in the database table.

The statement MODIFY sets sy-dbcnt to the number of processed rows. If an overflow occurs because the number or rows is greater than 2,147,483,647, sy-dbcnt is set to -1. If sy-subrc is 2, sy-dbcnt is also set to the value -1 (for undefined).

Notes

• The changes are finally applied to the database at the next database commit. Until that point, they can still be undone using a database rollback. The current isolation level defines whether the modified data can no longer be read into other database LUWs before or only after the database commit.

• The statement MODIFY sets a database lock as an exclusive lock until the next database commit or rollback. If used incorrectly, this can produce a deadlock.

• The number of rows that can be inserted or modified in the tables of a database within a database LUW is limited, since a database system can only manage a limited amount of locks and data in the rollback area.

• Once rows have been inserted into a global temporary table, this table must be emptied again explicitly before the next implicit database commit using the statement DELETE FROM without WHERE or using an explicit database commit or database rollback. If not, the runtime error COMMIT_GTT_ERROR is produced.

• The statement MODIFY dbtab FROM wa has the statement MODIFY itab FROM wa with identical syntax. If an internal table has the same name as a DDIC database table, a statement like this accesses the internal table.

Example

The first MODIFY statement inserts a row in an empty table. The second MODIFY statement modifies the values of the non-key fields of this row and inserts two additional rows.

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