Work with a table in different schema depending on the user group

Question

I have 2 groups of users user_group1, user_group2 and also two different schemas schema_group1,schema_group2 containing the same table names with a different content.
Now, i have to write a stored procedure which takes user name as input and depending on which group the user belongs to, i want to work with table in that user_group schema.  i.e.(if user_group1 then "schema_group1"."table". if user_group2 then "schema_group2"."table" )
i tried to set schema using dynamic sql but it seems that the schema is changing only after the end of the stored procedure.

Answer 1

yes, i do maintain a table to map user groups with schema name.
i have two tables:
table-1: USERS(user_name, group_name)
table-2: GET_SCHEMA(group_name, schema_name)
// Just to make it simple(for testing purpose), i am directly assigning the schema_name inside the stored procedure.
CREATE PROCEDURE "TEJA"."RETURN_SCHEMA_OF_USER" (IN IN_USER_NAME VARCHAR(30))
LANGUAGE SQLSCRIPT
AS
BEGIN
     DECLARE VAR_USER_GROUP VARCHAR(20);
     --DECLARE VAR_SCHEMA_NAME VARCHAR(20);
     DECLARE SCHEMA_NAME VARCHAR(20);
     DECLARE SQL_STATEMENT VARCHAR(200);
     DECLARE VAR_TEMP VARCHAR(200);
     SELECT USER_GROUP INTO VAR_USER_GROUP FROM "TEJA"."USERS" WHERE USER_NAME =      IN_USER_NAME;
     --SELECT VAR_USER_GROUP AS USER_GRP FROM DUMMY;
     -- SELECT GROUP_NAME INTO VAR_SCHEMA_NAME FROM GET_SCHEMA WHERE GROUP_NAME =      VAR_USER_GROUP;
     -- Instead of above statement, i am directly assigning the schema_name below
     IF VAR_USER_GROUP = 'UNION' THEN
            SCHEMA_NAME := 'USER_UNION';
     ELSE
            SCHEMA_NAME := 'USER_CORPORATE';
     END IF;
     SQL_STATEMENT := 'SELECT * FROM "'||:SCHEMA_NAME||'"."USER_DETAILS"';
     --I have USER_DETAILS table in both the schemas.
     --SQL_STATEMENT := 'SET SCHEMA ' || :SCHEMA_NAME || ' ';
     --sets the schema after the stored procedure is executed.
     EXECUTE IMMEDIATE SQL_STATEMENT;
END;
This dynamic sql statement does the job for me, but i don't want to use dynamic sql in all my stored procedures. I need this kind of functionality in almost all of my stored procedures. So, i am looking for a better approach.  I really appreciate your valuable inputs.
Thank you