A specific example of ABAP type and EDM type mapping in SAP segw transaction code

The examples in this article focus on Edm Attribute ABAP Datetime Processing logic .Datetime Just mapping ABAP The type and EDM One of the examples of possible inconsistencies when typing .

about Edm.Datetime attribute , On the back end ,ABAP A field can be represented as a simple date or timestamp , It can be with or without decimal seconds .

therefore , stay Service Builder For one EDM.Datetime Properties of type , Additional information is needed to put this EDM Type maps to the correct in the backend ABAP Field type . If not mapped correctly , It will lead to wrong type assignment .

The correct type assignment is for MPC Automatic generation of is crucial , because DPC The implementation is based on MPC Types generated in the class .

stay Service Builder The initial solution to achieve this goal in is :

• If precision = 0 also scale = 0, that ABAP internal type by type D.

• If precision = 8 also scale = 0, that ABAP internal type by type P,length by 8 decimals by 0 (timestamp without fractional seconds)

• If scale = 7, that ABAP internal type by type P,length 11 decimals 7 (timestamp with fractional seconds)

In addition to using precision and scale Beyond attribute , You can also use Service Builder Medium ABAP Type Editor Come on Set up directly Internal type . stay ABAP In the type editor , You can manually set the category to internal type , The following rules ：

• Type Kind = Date, Length = 8, Decimals = 0 ( representative Simple Date, internal type by D)
• Type Kind = Packed, Length = 15, Decimals = 0 (timestamp without fractional seconds, internal type stay MPC Shown in type P length 8 decimals 0)
• Type Kind = Packed, Length = 21, Decimals = 7 (timestamp with fractional seconds, internal type stay MPC Shown in type P,length 11 decimals 7)

The above described rules are reflected in the screenshot below ：

perhaps , You can use ABAP The type editor will be a Data Element Assign to an attribute . stay ABAP In the type editor , You can manually turn Category Set to Date, And enter the data element name in the association type field .

When using RFC/BOR Import or assign DDIC Type , If the structure is assigned to the parent component ( That is to say Entity Type Or complex types ), Not in property Assign by level .

When used from DDIC Structure import options , The date field is handled as follows :

• If the field's field is type TZNTSTMPS , Then there is no decimal second timestamp ,MPC The internal type of is type P, length 8, decimal point 0

• If the domain type of this field is TZNTSMPl, be MPC The internal type is P type , The length is 11 position , Would have a 7