ABAP CDs realizes multi line field content splicing

Requirements are as follows , When the same vendor maintains multiple phones , Use its content / Splicing

The effect is as follows ：

Implementation steps ：

1. establish TABLE FUNCTION Type of CDS

2. stay eclipse perhaps HANA studio Create corresponding classes and methods in , And implement the interface IF_AMDP_MARKER_HDB, take ABAP Class to AMDP class , And for the TABLE FUNCTION Create an implementation method

3. Implementation method , Use string_agg Method for content splicing , Don't forget the last SQL Before adding return Parameters

• BY DATABASE FUNCTION： This option marks the method as a table function .
• FOR HDB： Define the database type as HDB（HANA database ）.
• LANGUAGE SQLSCRIPT：HANA The language used by the database procedure .
• OPTIONS READ-ONLY： No changes are allowed in the database process .
• USING： Define the database tables that will be used in our table functions 、 View or process .

4. Create a new CDS To call

 

  above .