表XYZ
包含列p_type
,其中包含PQR表的列名。现在,我将从XYZ
表和sum(amount)
基于p_type
组获取记录,该记录是从表XYZ
中的记录中提取的。我使用了分区,因为我也想要t_id
而不是分组依据。现在我获取从PQR
表中获取的记录,并与XYZ
表的记录进行比较,对于从PQR
表中提取的每个记录,将sum(amount)
与记录进行比较XYZ表。
我已经在嵌套表中获取了xyz_id
和t_id
,但是我想在游标中使用它,是否有任何方法可以执行此操作以便我可以一次性选择这些记录。
我找到的可能解决方案是采用临时表,但如果我不想使用临时表,那么解决方案是什么。
DECLARE
type queryCursor is ref cursor;
v_ref queryCursor;
v_query queryCursor;
v_t_id pqr.t_id%TYPE;
v_total NUMBER (38);
CURSOR varcursor
IS
SELECT abc_id,p_type,p_amount
FROM xyz;
v_temp VARCHAR2 (4000);
v_temp1 VARCHAR2 (200);
v_temp2 VARCHAR2 (200);
TYPE XYZ_table IS TABLE OF XYZ%ROWTYPE;
v_XYZ XYZ_table :=XYZ_table();
TYPE PQR_table IS TABLE OF PQR%ROWTYPE;
v_PQR PQR_table :=XYZ_table();
BEGIN
FOR varcursor_rec IN varcursor
LOOP
v_temp1 := varcursor_rec.p_type; --p_type contains column name of the pqr table
v_temp :=
'SELECT T_ID,SUM(AMOUNT) OVER (PARTITION BY '
|| v_temp1
|| ' ORDER BY '
|| v_temp1
|| ') total from pqr
||';
OPEN v_ref FOR v_temp;
LOOP
FETCH V_REF into v_t_id,v_total;
exit when V_REF%notfound;
IF varcursor_rec.p_amount <v_total
THEN
counter:=counter+1;
v_XYZ.EXTEND;
v_PQR.EXTEND;
v_XYZ(counter).xyz_id:=varcursor_rec.xyz_id;
v_PQR(counter).t_id:=varcursor_rec.t_id;
--HOW CAN I FETCH THE
END IF;
END LOOP;
END LOOP;
END;
/
XYZ表:
xyz_id p_type p_amount
============================================================
p_1 p_id 100000
p_2 p_id,t_status 100
PQR表:
T_id p_id amount t_status
=================================================
1 E1 100 open
2 E2 200 open
3 E1 200 close
4 E2 300 open
5 E1 100 close
答案 0 :(得分:3)
您可以使用声明的对象类型和声明的对象类型的表来执行此操作。
让我们从创建表和数据开始:
CREATE TABLE xyz
( xyz_id VARCHAR2(3)
, p_type VARCHAR2(20)
, p_amount NUMBER
);
INSERT INTO xyz VALUES ('p_1','p_id','100000');
INSERT INTO xyz VALUES ('p_2','p_id,t_status','100');
CREATE TABLE pqr
( t_id NUMBER
, p_id VARCHAR2(2)
, amount NUMBER
, t_status VARCHAR2(5)
);
INSERT INTO pqr VALUES (1,'E1',100,'open');
INSERT INTO pqr VALUES (2,'E2',200,'open');
INSERT INTO pqr VALUES (3,'E1',200,'close');
INSERT INTO pqr VALUES (4,'E2',300,'open');
INSERT INTO pqr VALUES (5,'E1',100,'close');
接下来,创建声明的对象类型:
CREATE TYPE pqr_tid_sumamt_rec IS OBJECT
( t_id NUMBER
, sum_amount NUMBER
);
CREATE TYPE pqr_tid_sumamt_tab IS TABLE OF pqr_tid_sumamt_rec;
CREATE TYPE xyztab_ptstab_rec IS OBJECT
( xyz_id VARCHAR2(3)
, p_type VARCHAR2(20)
, p_amount NUMBER
, p_pqr_tid_sumamt_tab pqr_tid_sumamt_tab
);
CREATE TYPE xyztab_ptstab_tab AS TABLE OF xyztab_ptstab_rec;
现在,我们将创建一个将返回带有嵌套表的sys_refcursor的函数:
CREATE OR REPLACE
FUNCTION xyz_pqr_refcursor
RETURN sys_refcursor
IS
TYPE querycursor IS REF CURSOR;
v_ref querycursor;
v_query querycursor;
v_t_id pqr.t_id%TYPE;
v_total NUMBER (38);
CURSOR varcursor IS
SELECT xyz_id,p_type,p_amount
FROM xyz;
v_temp VARCHAR2 (4000);
v_temp1 VARCHAR2 (200);
tab_pqr_tid_sumamt pqr_tid_sumamt_tab := pqr_tid_sumamt_tab();
tab_xyztab_ptstab xyztab_ptstab_tab := xyztab_ptstab_tab();
ret_cur sys_refcursor;
BEGIN
FOR varcursor_rec IN varcursor
loop
v_temp1 := varcursor_rec.p_type; --p_type contains column name of the pqr TABLE
v_temp :=
'SELECT T_ID,SUM(AMOUNT) OVER (PARTITION BY '
|| v_temp1
|| ' ORDER BY '
|| v_temp1
|| ') total from pqr';
-- dbms_output.put_line('v_temp: '||v_temp);
OPEN v_ref FOR v_temp;
loop
fetch v_ref INTO v_t_id,v_total;
exit WHEN v_ref%notfound;
IF varcursor_rec.p_amount < v_total THEN
tab_pqr_tid_sumamt.EXTEND;
-- cast the cursor values into the record type to be added to the table type
tab_pqr_tid_sumamt( tab_pqr_tid_sumamt.count ) := pqr_tid_sumamt_rec(v_t_id, v_total);
END IF;
END loop;
tab_xyztab_ptstab.EXTEND;
-- cast the cursor values and nested table type to the record type and add to the table type
tab_xyztab_ptstab(tab_xyztab_ptstab.count) := xyztab_ptstab_rec (varcursor_rec.xyz_id, varcursor_rec.p_type, varcursor_rec.p_amount, tab_pqr_tid_sumamt);
END loop;
--open the return refcursor
OPEN ret_cur FOR
SELECT xyztab_ptstab_rec(xyz_id, p_type, p_amount, p_pqr_tid_sumamt_tab) FROM TABLE( tab_xyztab_ptstab );
-- return the refcursor
RETURN ret_cur;
END xyz_pqr_refcursor;
现在,让我们测试一下这个函数:
DECLARE
test_cur sys_refcursor;
test_rec xyztab_ptstab_rec;
test_pqrtab pqr_tid_sumamt_tab;
counter int := 1;
BEGIN
test_cur := xyz_pqr_refcursor();
loop
fetch test_cur INTO test_rec;
exit WHEN test_cur%notfound;
dbms_output.put_line('test_rec('||counter||') -- xyz_id: '||test_rec.xyz_id||', p_type: '||test_rec.p_type||', p_amount: '||test_rec.p_amount);
test_pqrtab := test_rec.p_pqr_tid_sumamt_tab;
FOR j IN 1 .. test_pqrtab.count
loop
dbms_output.put_line('.... test_pqrtab('||j||') - t_id: '||test_pqrtab(j).t_id||', sumamt: '||test_pqrtab(j).sum_amount);
END loop;
counter := counter + 1;
END loop;
EXCEPTION
WHEN others THEN dbms_output.put_line('whoops: '||sqlerrm);
END;
测试结果:
test_rec(1) -- xyz_id: p_1, p_type: p_id, p_amount: 100000
test_rec(2) -- xyz_id: p_2, p_type: p_id,t_status, p_amount: 100
.... test_pqrtab(1) - t_id: 3, sumamt: 300
.... test_pqrtab(2) - t_id: 5, sumamt: 300
.... test_pqrtab(3) - t_id: 4, sumamt: 500
.... test_pqrtab(4) - t_id: 2, sumamt: 500
或者,您可以只返回声明的表类型本身而不是sys_refcursor。
我希望这会有所帮助。