AMDP Introduction

 AMDP – ABAP Managed Database Procedures

• AMDP – AMDP class must implement an Interface IF_AMDP_MARKER_HDB then this class call as AMPD class. Interface IF_AMDP_MARKER_HDB always declare in the PUBLIC Section.
• AMDP class can contain AMDP Method as well as non-AMDP method.
• Difference between Normal Method and AMDP method:

Normal Method	AMDP Method
Method <Method_Name>.   Endmethod.	Method <amdp_method_name>  BY DATABASE PROCEDURE FOR HDB LANGUAGE SQLSCRIPT OPTIONS ReadOnly USING <db_entity>.   Endmethod.
We can call AMDP method	We can’t call Normal Method

• In Normal method we can call AMDP Method but in AMDP method we can’t call Normal Method.

• AMDP perquisite
• All parameters must be fully typed. Generic data types such as TYPE TABLE or REF TO DATA are not allowed.
• All parameters must be passed as value. This is obvious considering the fact that the application server runs on a different system than the database. Accordingly, there is no common memory area referencing both systems.
• Only IMPORTING, EXPORTING and CHANGING parameters are allowed in AMDP procedures. It is not possible to use RETURNING parameters.
• Only AMDP exception classes can be declared in the method signature.
• AMDP Class/Method can only be created/ modified using ADT Tool.