"How to create SQLScript User Defined Libraries"

"What do I need before I start?"

" This tutorial is designed for SAP HANA Cloud. Tutorials: Creating Table User Defined Functions "

Create SQLScript User Defined Libraries

Leveraging SQLScript in Stored Procedures, User Defined Functions, and User Defined Libraries

🎓intermediate ⏱15 min SAP HANA Intermediate Sql SAP HANA Cloud SAP Business Application Studio 0/4

Overview

🎓 intermediate ⏱ 15 min. SAP HANAIntermediateSqlSAP HANA CloudSAP Business Application Studio

You will learn

✔How to create SQLScript User Defined Libraries

R Rich Heilman November 1, 2022

Created by February 11, 2021

Contributors

Prerequisites

This tutorial is designed for SAP HANA Cloud.
Tutorials: Creating Table User Defined Functions

Steps

Open all Close all

Intro

Libraries are designed to group related variables, functions, and procedures together within a common object. These library members can either be exposed using the PULBIC keyword, or set to only be consumable from within the library itself using the PRIVATE keyword.

Step 1 Create new library

—

Return to the SAP Business Application Studio and right click on the src folder and choose New Folder.
editor
Enter the name of the folder as libraries and click OK.
dialog
Use what you have learned in previous tutorials and create a new SAP HANA Database Artifact using the SAP HANA: Create SAP HANA Database Artifact command from the View menu.
command
Make sure to select the libraries folder, and choose Library as the Artifact Type, then give the name as masterdata. Click Create
wizard

Step 2 Enter the library code

Click on the new masterdata.hdblibrary file in the libraries folder and the editor should open with the shell of the library.
editor
Between the BEGIN and END statements, define a public variable library member called rowcount with type int.
SQLScript
```
public variable rowcount int;
```

After the public variable, define a public function library member as shown here.

SQLScript
public function "employee_exists"(
             in im_employee_id nvarchar(36) )
             returns res boolean as
begin
    declare lv_count int;
    select count(*) into lv_count from "OPENSAP_MD_EMPLOYEES"
                           where id = im_employee_id;
    if  lv_count > 0 then
     res = true;
    else
     res = false;
    end if;
end;

After the public function, define two public procedure library members, one called get_employee_data and the other get_business_partner_data.

SQLScript
public procedure "get_employee_data"(
             out ex_employees "OPENSAP_MD_EMPLOYEES" )
   LANGUAGE SQLSCRIPT
   SQL SECURITY INVOKER
   AS
begin
  ex_employees = select * from "OPENSAP_MD_EMPLOYEES";
  rowcount = record_count(:ex_employees);
end;

public procedure "get_business_partner_data"(
             out ex_businesspartners "OPENSAP_MD_BUSINESSPARTNERS" )
   LANGUAGE SQLSCRIPT
   SQL SECURITY INVOKER
    AS
begin
  ex_businesspartners = select * from "OPENSAP_MD_BUSINESSPARTNERS";
  rowcount = record_count(:ex_businesspartners);
end;

The complete code should look like this.

SQLScript
LIBRARY "masterdata"
LANGUAGE SQLSCRIPT
AS
BEGIN

public variable rowcount int;

public function "employee_exists"(
             in im_employee_id nvarchar(36) )
             returns res boolean as
begin
    declare lv_count int;
    select count(*) into lv_count from "OPENSAP_MD_EMPLOYEES"
                           where id = im_employee_id;
    if  lv_count > 0 then
     res = true;
    else
     res = false;
    end if;
end;

public procedure "get_employee_data"(
             out ex_employees "OPENSAP_MD_EMPLOYEES" )
   LANGUAGE SQLSCRIPT
   SQL SECURITY INVOKER
   AS
begin
  ex_employees = select * from "OPENSAP_MD_EMPLOYEES";
  rowcount = record_count(:ex_employees);
end;

public procedure "get_business_partner_data"(
             out ex_businesspartners "OPENSAP_MD_BUSINESSPARTNERS" )
   LANGUAGE SQLSCRIPT
   SQL SECURITY INVOKER
    AS
begin
  ex_businesspartners = select * from "OPENSAP_MD_BUSINESSPARTNERS";
  rowcount = record_count(:ex_businesspartners);
end;

END

Save your work.
save

Step 3 Create a procedure

Use what you have learned and create a new procedure in the procedures folder called get_master_data. Because our library procedures actually update the library variable, we need our consuming procedure to be Read/Write as well, so make sure to remove the READS SQL DATA from this procedure as shown.
save

Enter the output parameters in the signature of the procedure.

SQLScript
out ex_emp_exists boolean,
out ex_employees "OPENSAP_MD_EMPLOYEES" ,
out ex_emp_count int,
out ex_business_partners "OPENSAP_MD_BUSINESSPARTNERS",
out ex_bp_count int

Enter code between the BEGIN and END statements. First call the library member scalar function called employee_exists and pass the result to the output parameter. Next, call the library member procedures and pass the result to the output parameters as well as pass the library member variable rowcount to the output parameters.
SQLScript
```
ex_emp_exists  = "masterdata":"employee_exists"('02BD2137-0890-1EEA-A6C2-BB55C19787FB');   

call "masterdata":"get_employee_data"( ex_employees );
ex_emp_count = "masterdata":rowcount;

call "masterdata":"get_business_partner_data"( ex_business_partners );
ex_bp_count = "masterdata":rowcount;
```

The completed code should look similar to this.

SQLScript
PROCEDURE "get_master_data"(
      out ex_emp_exists boolean,
      out ex_employees "OPENSAP_MD_EMPLOYEES" ,
      out ex_emp_count int,
      out ex_business_partners "OPENSAP_MD_BUSINESSPARTNERS",
      out ex_bp_count int
 )
   LANGUAGE SQLSCRIPT
   SQL SECURITY INVOKER
   --DEFAULT SCHEMA <default_schema_name>
   AS
BEGIN

ex_emp_exists  = "masterdata":"employee_exists"('02BD2137-0890-1EEA-A6C2-BB55C19787FB');   

call "masterdata":"get_employee_data"( ex_employees );
ex_emp_count = "masterdata":rowcount;

call "masterdata":"get_business_partner_data"( ex_business_partners );
ex_bp_count = "masterdata":rowcount;

END

Step 4 Save, deploy, run and Cceck results

Resources

Next Steps

TUTORIAL Use Table Variable Operators ⏱ 10 min. +

Discussion

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Steps

1. Create new library

2. Enter the library code

3. Create a procedure

4. Save, deploy, run and Cceck results

Create SQLScript User Defined Libraries

Overview

You will learn

Prerequisites

Prerequisites

Steps

Intro

Resources

Next Steps

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Discussion

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