How to store lengthy JSON strings in SAP ABAP as variables or literals without extensive formatting restrictions

Question

How to store lengthy JSON strings in SAP ABAP as variables or literals without extensive formatting restrictions

Is there a way to input lengthy JSON data into ABAP as a string literal without the need for excessive line breaks or formatting? Perhaps enclosing the string in a specific template, or utilizing a method similar to JSON.stringify(..) found in other languages. I am relatively new to ABAP and unsure about the best approach...

For example, consider this data:

{"todos":[{"id":1,"todo":"Do something nice for someone I care about" ...}]}

It would be convenient if ABAP supported template string literals like those in JavaScript, allowing for easy inclusion of both ' and " without needing to escape characters...

By the way... My goal is to deserialize the JSON into an internal table, then insert it into my Dictionary Table using a loop which seems to be functioning correctly,

DATA: lv_json TYPE string VALUE '[{"id":10,"todo": ...}]'

However, I still need to determine the best format for parsing the JSON... (is there a program available for parsing JSON from a file?)..

javascript json serialization abap

Answer 1

Answer №1

When working with ABAP, there is no built-in support for multi-line string literals. However, you can achieve a similar effect by concatenating strings using the && operator. If your code contains both { and ', you can use the backtick character ` to create a string literal without having to parse any string templates:

DATA(lv_json_string) = 
  `{"todos":[` &&
  `{"id":1,"todo":"Do something nice for someone I care about","completed":true,"userId":26},` &&
  `{"id":2,"todo":"Memorize the fifty states and their capitals","completed":false,"userId":48},` &&
  `{"id":3,"todo":"Watch a classic movie","completed":false,"userId":4}` &&
  `]}`.

To process this string, you can utilize the cl_abap_json class.

If your goal is simply to hard-code content for an internal table, there is a more efficient method available: utilizing a VALUE literal. For example, if your table type defined in the dictionary is named z_todo_table, you could implement it like this:

DATA(lt_my_table) = VALUE z_todo_table(
   ( id = 1 todo = `Do something nice for someone I care about` completed = abap_true userId = 26 )
   ( id = 2 todo = `Memorize the fifty states and their capitals` completed = abap_false userId = 48 )
   ( id = 3 todo = `Watch a classic movie` completed = abap_false userId = 4 )
).

This approach not only simplifies the process compared to using a JSON parser but also helps identify any formatting errors during activation rather than runtime.

Answer 2

When working with ABAP, there is no built-in support for multi-line string literals. However, you can achieve a similar effect by concatenating strings using the && operator. If your code contains both { and ', you can use the backtick character ` to create a string literal without having to parse any string templates:

DATA(lv_json_string) = 
  `{"todos":[` &&
  `{"id":1,"todo":"Do something nice for someone I care about","completed":true,"userId":26},` &&
  `{"id":2,"todo":"Memorize the fifty states and their capitals","completed":false,"userId":48},` &&
  `{"id":3,"todo":"Watch a classic movie","completed":false,"userId":4}` &&
  `]}`.

To process this string, you can utilize the cl_abap_json class.

If your goal is simply to hard-code content for an internal table, there is a more efficient method available: utilizing a VALUE literal. For example, if your table type defined in the dictionary is named z_todo_table, you could implement it like this:

DATA(lt_my_table) = VALUE z_todo_table(
   ( id = 1 todo = `Do something nice for someone I care about` completed = abap_true userId = 26 )
   ( id = 2 todo = `Memorize the fifty states and their capitals` completed = abap_false userId = 48 )
   ( id = 3 todo = `Watch a classic movie` completed = abap_false userId = 4 )
).

This approach not only simplifies the process compared to using a JSON parser but also helps identify any formatting errors during activation rather than runtime.

How to store lengthy JSON strings in SAP ABAP as variables or literals without extensive formatting restrictions

Answer №1

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