问题
I'm trying to create a stored function in Oracle that will count the table rows..i want to make the table name dynamic, so i passed it as a parameter, the stored function code looks like this
create type tes_jml_obj is object(jumlah integer);
create type tes_jml_table is table of tes_jml_obj;
create or replace function jumlahBaris(namatabel varchar)
return tes_jml_table
is
tabel tes_jml_table := tes_jml_table();
begin
for r in (execute immediate 'select count(*) as jumlah from' || namatabel)
loop
tabel.extend;
tabel(1) := tes_jml_obj(r.jumlah);
end loop;
return tabel;
end;
But when i execute it, it returns errors. Am i missing something here? Is that the correct way to get the table rows dynamically?
回答1:
- Your execute immediate will return only one value, the count, so what is there to loop over?
- Also I'm not sure that execute immediate works with an implicit cursor.
- In your SQL it looks like you don't have a space after the
from
keyword.
Try something like this instead:
create or replace function jumlahBaris(namatabel varchar)
return tes_jml_table
is
tabel tes_jml_table := tes_jml_table();
the_count integer;
the_sql varchar(100);
begin
the_sql := 'select count(*) as jumlah from ' || namatabel;
execute immediate the_sql INTO the_count;
if the_count IS NOT NULL THEN
tabel.extend;
tabel(1) := tes_jml_obj(the_count);
end if;
return tabel;
end;
回答2:
- There is a space missing after FROM keyword in the EXECUTE IMMEDIATE statement.
- EXECUTE IMMEDIATE statement has a syntax error. You are missing the INTO clause.
- You cannot use EXECUTE IMMEDIATE inside a CURSOR FOR LOOP. Basically, you are returning nothing from the execute immediate statement as mentioned in point 2 above.
- The iteration syntax for the LOOP is not correct. The syntax is
FOR r IN 1..COUNT()
.
After rectifying your code, this is how it would look like:
SQL> CREATE OR REPLACE TYPE TES_JML_OBJ IS OBJECT(JUMLAH NUMBER)
2 /
Type created.
SQL> CREATE OR REPLACE TYPE TES_JML_TABLE IS TABLE OF TES_JML_OBJ
2 /
Type created.
SQL> CREATE OR REPLACE
2 FUNCTION jumlahBaris(
3 namatabel VARCHAR2)
4 RETURN tes_jml_table
5 IS
6 TABEL TES_JML_TABLE := TES_JML_TABLE();
7 cnt NUMBER;
8 BEGIN
9 EXECUTE IMMEDIATE 'select count(*) as jumlah from ' || NAMATABEL INTO CNT;
10 FOR R IN 1..CNT
11 LOOP
12 TABEL.EXTEND;
13 TABEL(R) := TES_JML_OBJ(R);
14 dbms_output.put_line(TES_JML_OBJ(R).jumlah);
15 END LOOP;
16 RETURN tabel;
17 END;
18 /
Function created.
SQL> SHO ERR
No errors.
So, the function compiled with no errors. Let's execute it and see the output:
SQL> SET SERVEROUTPUT ON
SQL> SELECT JUMLAHBARIS('EMP') FROM DUAL;
JUMLAHBARIS('EMP')(JUMLAH)
--------------------------------------------------------------------------------
TES_JML_TABLE(TES_JML_OBJ(1), TES_JML_OBJ(2), TES_JML_OBJ(3), TES_JML_OBJ(4), TE
S_JML_OBJ(5), TES_JML_OBJ(6), TES_JML_OBJ(7), TES_JML_OBJ(8), TES_JML_OBJ(9), TE
S_JML_OBJ(10), TES_JML_OBJ(11), TES_JML_OBJ(12), TES_JML_OBJ(13), TES_JML_OBJ(14
))
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SQL>
来源:https://stackoverflow.com/questions/29958998/oracle-stored-function-pass-table-name-as-parameter