Create procedure upsert (name of the existing table, incoming table name)

Is it possible to create a procedure that makes a merge (upsert) with only two parameters:

  1. Existing Table name - name of table that will have data merged into it.
  2. Incoming Table name - name of the table that has developed data day/news.

The method would be:

  1. Use primary keys on the "existing" table as the condition links
  2. Fact and update if exists and insert new
  3. no record
  4. no clues
  5. no removal clause

Oracle 11g

MERGE < tip > < table_name >

USING < table_view_or_query >

(< CONDITION >)

WHEN MATCHED THEN < update_clause >

DELETE < where_clause >

WHEN NOT MATCHED THEN < insert_clause >

[ERRORLOG < log_errors_clause > < reject limit < integer | unlimited >];

< table_name > - from input parameter

< table_view_or_query > -socket input parameter

< condition > - primary key links (how search a single/multiple primary keys and return the list?)

< update_clause > - update all columns (other than KP, how to get and use a dynamic list of columns)

< where_clause > - not used

< insert_clause > - insert new records for all columns (including the PK (s))

declare

p_source varchar2 (30): = "EMP_X";

p_target varchar2 (30): = "EMP_Y";

query varchar2 (32000);

function get_cols (p_table in varchar2) return varchar2 is

VARCHAR2 (32000) retval;

Start

Select the Group (order of column_id) listagg (column_name, ',')

in retval

of user_tab_cols

where table_name = p_table

Table_name group;

Return retval;

end;

function get_keys (p_table in varchar2) return varchar2 is

VARCHAR2 (4000) retval;

Start

Select listagg (cc.column_name, ',') in the Group (order by cc.position)

in retval

from user_constraints c,.

user_cons_columns cc

where cc.table_name = p_table

and c.constraint_type = 'P '.

and cc.table_name = c.table_name

and cc.constraint_name = c.constraint_name

C.table_name group;

Return retval;

end;

function merge (p_merge1 varchar2, p_merge2 varchar2, p_link varchar2) return varchar2 is

Merge1 varchar2 (32000): = p_merge1 | «, » ;

merge2 varchar2 (32000): = p_merge2 | «, » ;

VARCHAR2 (32000) retval;

Start

then merge1 is not null

loop

retval: = retval | » t.'|| substr (Merge1, 1, InStr (Merge1, ',') - 1) |'s =.' | substr (merge2, 1, InStr (merge2, ',') - 1);

Merge1: = substr (merge1, instr(merge1,',') + 1);

merge2: = substr (merge2, instr (merge2, ',') + 1);

If merge1 is not null then

retval: = retval | p_link;

end if;

end loop;

Return retval;

end;

Chopper (p_cols p_keys varchar2, varchar2) return varchar2 is

passes varchar2 (32000): = ', '. p_cols | «, » ;

keys varchar2 (32000): = ', '. p_keys | «, » ;

VARCHAR2 (32000) retval;

Start

While the keys! = «, »

loop

If instr (passes, substr (keys, 1, instr(keys,',',1,2))) = 1 then

cols: = substr (collars, instr(cols,',',1,2));

on the other

cols: = substr (passes, 1, instr (passes, substr (keys, 1, instr(keys,',',1,2))) | substr (collars, InStr (collars, ',', InStr (passes, substr (Keys, 1, InStr(Keys,',',1,2))), 2) + 1);)

end if;

keys: = substr (keys, instr(keys,',',1,2));

end loop;

return trim (both ',' collar);

end;

Start

query: = 'merge'. p_target |' t ' |' using (select ' | get_cols (p_source): ' from ' | p_source |') s '.

' on ('|) Merger (get_keys (p_target), get_keys (p_source), 'and') |') ' ||

"When matched then update set ' | '. Merger (Chopper (get_cols (p_target), get_keys (p_target)), Chopper (get_cols (p_source), get_keys (p_source)), ',').

«When not matched then insert ('|)» get_cols (p_target) |') values (s.'|) Replace (get_cols (p_source),', ', ', s') |') ';

dbms_output.put_line (Query);

end;


Fusion in EMP_Y t using (select EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO EMP_X) s on (t.EMPNO = s.EMPNO and t.ENAME = s.ENAME) when matched then update set t.JOB = s.JOB, t.MGR = s.MGR, t.HIREDATE = s.HIREDATE, t.SAL = s.SAL, t.COMM = s.COMM, t.DEPTNO = s.DEPTNO when not matched then insert (EMPNO, ENAME, JOB, MGR, HIREDATE, SAL, COMM, DEPTNO) values (s.EMPNO, s.ENAME, s.JOB, s.MGR, s.HIREDATE, s.SAL, s.COMM, s.DEPTNO)

Concerning

Etbin

Tags: Database

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