Question

Any better method to UPSERT into a table, provided :

• Data upsert at ~1 row/second
• Table Name is DYNAMIC, generated using ObjectID parameter passed to it

THE FOLLOWING PROCEDURE THROWS :
“ORA-00942: table or view does not exist”

CREATE OR REPLACE PROCEDURE
PROCEDURE "SPINSERTDATA"
(
  pObjectID IN RAW,
  pDateTime IN TIMESTAMP,
  pValue IN BINARY_DOUBLE,
)
AS
BEGIN
  Declare
    vQueryInsert VARCHAR2(1000);
    vQueryUpdate VARCHAR2(1000);
    vTableName VARCHAR2(30);
  Begin      
      vTableName := FGETTABLENAME(POBJECTID => pObjectID);
      vQueryUpdate := 'UPDATE '      || vTableName || ' SET "VALUE" = :1';
      vQueryInsert := 'INSERT INTO ' || vTableName || ' ("DTTIME", "VALUE") VALUES (:1, :2)';

      EXECUTE IMMEDIATE vQueryInsert USING pDateTime, pValue;
        EXCEPTION
          WHEN DUP_VAL_ON_INDEX THEN 
            EXECUTE IMMEDIATE vQueryUpdate USING pValue;
  End;
END "SPINSERTDATA";

• Apparently MERGE does not work as the TableName Cannot be dynamic
  ???
• I’m a newbie, my third month of coding, I scourged through
  STACKOVERFLOW & Googled for 3 days now, trying all sorts of funny &
  desperate solutions … Even a very relevant link if you found one
  would be honestly appreciated.

Answer 1

MERGE works perfectly fine with Native dynamic SQL (EXECUTE IMMEDIATE):

create table so_test(pk number not null primary key, value varchar2(20));

insert into so_test(pk, value) values(1, 'one');

declare
  l_SQL varchar2(4000);
  l_tablename varchar2(4000) default 'so_test';
begin
  l_SQL := 'merge into ' || l_tablename || ' target' ||
    ' using (select 1 pk, ''eins'' value from dual union all
             select 2 pk, ''zwei'' value from dual) source
      on (target.pk = source.pk)
      when matched then 
        update set target.value = source.value
      when not matched then
        insert values(source.pk, source.value)      
  ';
  dbms_output.put_line(l_sql);
  execute immediate l_SQL;
end; 

Could you please post the error message you get when using MERGE?