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danrega
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02_Structures.md
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02_Structures.md
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- [Structures in ABAP SQL Statements](#structures-in-abap-sql-statements)
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- [Structures in Statements for Processing Internal Tables](#structures-in-statements-for-processing-internal-tables)
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- [Including Structures](#including-structures)
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- [Getting Structured Type Information and Creating Structures at Runtime](#getting-structured-type-information-and-creating-structures-at-runtime)
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- [Excursions](#excursions)
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- [sy Structure](#sy-structure)
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- [Getting Structured Type Information and Creating Structures at Runtime](#getting-structured-type-information-and-creating-structures-at-runtime)
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- [Boxed Components](#boxed-components)
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- [Executable Example](#executable-example)
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@@ -1110,65 +1110,6 @@ TYPES BEGIN OF address_type.
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TYPES END OF address_type.
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```
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<p align="right"><a href="#top">⬆️ back to top</a></p>
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## Getting Structured Type Information and Creating Structures at Runtime
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Using [Runtime Type Services (RTTS)](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenrun_time_type_services_glosry.htm "Glossary Entry")
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you can ...
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- get type information on data objects, data types or [instances](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abeninstance_glosry.htm "Glossary Entry") at runtime ([Runtime Type Identification (RTTI)](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenrun_time_type_identific_glosry.htm "Glossary Entry")).
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- define and create new data types as [type description objects](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abentype_object_glosry.htm) at runtime ([Runtime Type Creation (RTTC)](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenrun_time_type_creation_glosry.htm "Glossary Entry")).
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For more information, see the [Dynamic Programming](06_Dynamic_Programming.md) cheat sheet.
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RTTI example:
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```abap
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TYPES: BEGIN OF demo_struc_type,
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comp1 TYPE c LENGTH 3,
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comp2 TYPE i,
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comp3 TYPE string,
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END OF demo_struc_type.
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DATA demo_struc TYPE demo_struc_type.
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DATA(tdo_c) = cl_abap_typedescr=>describe_by_data( demo_struc ).
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"DATA(tdo_c) = cl_abap_typedescr=>describe_by_name( 'DEMO_STRUC_TYPE' ).
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"Cast to get more specific information
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DATA(tdo_struc) = CAST cl_abap_structdescr( cl_abap_typedescr=>describe_by_data( demo_struc ) ).
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"DATA(tdo_struc) = CAST cl_abap_structdescr( tdo_c ).
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DATA(type_category_struc) = tdo_struc->kind.
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DATA(relative_name_struc) = tdo_struc->get_relative_name( ).
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... "Explore more options by positioning the cursor behind -> and choosing CTRL + Space
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DATA(type_of_struc) = tdo_struc->struct_kind.
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DATA(struc_comps) = tdo_struc->components.
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DATA(struc_comps_more_details) = tdo_struc->get_components( ).
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DATA(struc_has_include) = tdo_struc->has_include.
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DATA(struc_incl_view) = tdo_struc->get_included_view( ).
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DATA(applies_to_data_struc) = tdo_struc->applies_to_data( `some string` ).
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"Example: "Looping" across a structure
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"For example, this may also be done using a DO loop and dynamic assignments.
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"Demo structure, all components are convertible to type string
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TYPES: BEGIN OF ty_struc,
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comp1 TYPE c LENGTH 3,
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comp2 TYPE string,
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comp3 TYPE i,
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comp4 TYPE n LENGTH 4,
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END OF ty_struc.
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DATA(struct) = VALUE ty_struc( comp1 = 'abc' comp2 = `ABAP` comp3 = 123 comp4 = '9876' ).
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DATA looped_struc TYPE string.
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"In the loop, a string is populated, component by component.
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LOOP AT CAST cl_abap_structdescr( cl_abap_typedescr=>describe_by_data( struct ) )->components INTO DATA(comp).
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looped_struc = |{ looped_struc }{ COND #( WHEN sy-tabix <> 1 THEN ` / ` ) }Name: "{ CONV string( comp-name ) }", Value: "{ struct-(comp-name) }"|.
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ENDLOOP.
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"Result:
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"Name: "COMP1", Value: "abc" / Name: "COMP2", Value: "ABAP" / Name: "COMP3", Value: "123" / Name: "COMP4", Value: "9876"
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```
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<p align="right"><a href="#top">⬆️ back to top</a></p>
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## Excursions
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@@ -1447,6 +1388,65 @@ CLASS zcl_demo_abap IMPLEMENTATION.
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ENDCLASS.
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```
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<p align="right"><a href="#top">⬆️ back to top</a></p>
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### Getting Structured Type Information and Creating Structures at Runtime
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Using [Runtime Type Services (RTTS)](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenrun_time_type_services_glosry.htm "Glossary Entry")
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you can ...
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- get type information on data objects, data types or [instances](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abeninstance_glosry.htm "Glossary Entry") at runtime ([Runtime Type Identification (RTTI)](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenrun_time_type_identific_glosry.htm "Glossary Entry")).
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- define and create new data types as [type description objects](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abentype_object_glosry.htm) at runtime ([Runtime Type Creation (RTTC)](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abenrun_time_type_creation_glosry.htm "Glossary Entry")).
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For more information, see the [Dynamic Programming](06_Dynamic_Programming.md) cheat sheet.
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RTTI example:
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```abap
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TYPES: BEGIN OF demo_struc_type,
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comp1 TYPE c LENGTH 3,
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comp2 TYPE i,
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comp3 TYPE string,
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END OF demo_struc_type.
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DATA demo_struc TYPE demo_struc_type.
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DATA(tdo_c) = cl_abap_typedescr=>describe_by_data( demo_struc ).
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"DATA(tdo_c) = cl_abap_typedescr=>describe_by_name( 'DEMO_STRUC_TYPE' ).
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"Cast to get more specific information
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DATA(tdo_struc) = CAST cl_abap_structdescr( cl_abap_typedescr=>describe_by_data( demo_struc ) ).
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"DATA(tdo_struc) = CAST cl_abap_structdescr( tdo_c ).
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DATA(type_category_struc) = tdo_struc->kind.
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DATA(relative_name_struc) = tdo_struc->get_relative_name( ).
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... "Explore more options by positioning the cursor behind -> and choosing CTRL + Space
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DATA(type_of_struc) = tdo_struc->struct_kind.
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DATA(struc_comps) = tdo_struc->components.
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DATA(struc_comps_more_details) = tdo_struc->get_components( ).
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DATA(struc_has_include) = tdo_struc->has_include.
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DATA(struc_incl_view) = tdo_struc->get_included_view( ).
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DATA(applies_to_data_struc) = tdo_struc->applies_to_data( `some string` ).
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"Example: "Looping" across a structure
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"For example, this may also be done using a DO loop and dynamic assignments.
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"Demo structure, all components are convertible to type string
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TYPES: BEGIN OF ty_struc,
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comp1 TYPE c LENGTH 3,
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comp2 TYPE string,
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comp3 TYPE i,
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comp4 TYPE n LENGTH 4,
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END OF ty_struc.
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DATA(struct) = VALUE ty_struc( comp1 = 'abc' comp2 = `ABAP` comp3 = 123 comp4 = '9876' ).
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DATA looped_struc TYPE string.
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"In the loop, a string is populated, component by component.
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LOOP AT CAST cl_abap_structdescr( cl_abap_typedescr=>describe_by_data( struct ) )->components INTO DATA(comp).
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looped_struc = |{ looped_struc }{ COND #( WHEN sy-tabix <> 1 THEN ` / ` ) }Name: "{ CONV string( comp-name ) }", Value: "{ struct-(comp-name) }"|.
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ENDLOOP.
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"Result:
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"Name: "COMP1", Value: "abc" / Name: "COMP2", Value: "ABAP" / Name: "COMP3", Value: "123" / Name: "COMP4", Value: "9876"
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```
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<p align="right"><a href="#top">⬆️ back to top</a></p>
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