我有这个简单的查询:
SELECT MEASURE_ID, MEASURE_VALUE FROM MY_TABLE;
目前只返回几条记录(将来会有很多记录):
8 265.7
7 559.6
此类表格上的DESC提供:
Name Null Type
------------ -------- ------------
MEASURE_ID NOT NULL NUMBER
MEASURE_VALUE NUMBER(10,1)
然后我定义了正确的PL / SQL类型:
CREATE OR REPLACE TYPE HASHMAP_NUM_TYPE_OBJ AS OBJECT (
THE_ID NUMBER,
THE_VALUE NUMBER(10,1)
);
CREATE OR REPLACE TYPE HASHMAP_NUM_TYPE IS TABLE OF HASHMAP_NUM_TYPE_OBJ;
并尝试使用BULK COLLECT获取记录:
stats_by_measure HASHMAP_NUM_TYPE;
...
OPEN cursor_1 FOR
SELECT MEASURE_ID, MEASURE_VALUE
FROM MY_TABLE;
...
FETCH cursor_1 BULK COLLECT INTO stats_by_measure;
...
CLOSE cursor_1;
但我有Oracle -6504错误。我做错了什么?
备注:如果我逐行获取相同的光标,请使用如下代码块:
foo NUMBER;
faa NUMBER(10,1);
my_obj HASHMAP_NUM_TYPE_OBJ;
...
LOOP
FETCH cursor_1 INTO foo, faa;
my_obj := HASHMAP_NUM_TYPE_OBJ(foo,faa);
EXIT WHEN cursor_1%NOTFOUND;
END LOOP;
一切正常!
答案 0 :(得分:3)
修改您的光标查询,如下所示,以便它具有相同的类型
OPEN cursor_1 FOR
SELECT HASHMAP_NUM_TYPE_OBJ(MEASURE_ID, MEASURE_VALUE)
FROM MY_TABLE;
答案 1 :(得分:1)
我已经解决了你的问题
declare
type REC_TYPE is record (
THE_ID number,
THE_VALUE number
);
type TB_TYPE is table of REC_TYPE index by binary_integer;
TBL TB_TYPE;
cursor CURSOR_1 is
select a1.MEASURE_ID A$1, a1.MEASURE_VALUE A$2
from MY_TABLE a1;
type REF_CUR_ is ref cursor return CURSOR_1%rowtype;
CURSOR_2 REF_CUR_;
begin
open CURSOR_2 for
select a1.MEASURE_ID A$1, a1.MEASURE_VALUE A$2
from MY_TABLE a1;
fetch CURSOR_2 bulk collect into TBL ;
close CURSOR_2;
return;
end;
它的作品。
我找到了另一种没有引导光标的方法there(寻找FETCH Statement with BULK COLLECT Clause
)
答案 2 :(得分:1)
您只能将BULK COLLECT
个对象放入对象表中。在你的情况下:
SQL> CREATE OR REPLACE TYPE hashmap_num_type_obj AS OBJECT (
2 the_id NUMBER,
3 the_value NUMBER(10,1)
4 );
5 /
Type created
SQL> CREATE OR REPLACE TYPE hashmap_num_type IS TABLE OF hashmap_num_type_obj;
2 /
Type created
SQL> DECLARE
2 l_tab hashmap_num_type;
3 BEGIN
4 SELECT hashmap_num_type_obj(measure_id, measure_value)
5 BULK COLLECT INTO l_tab
6 FROM my_table;
7 END;
8 /
PL/SQL procedure successfully completed
答案 3 :(得分:0)
您应该根据记录类型而不是对象类型将行检索到类型中。以下作品;
DECLARE
TYPE hashmap_num_type_rt IS RECORD
(THE_ID NUMBER,
THE_VALUE NUMBER(10,1)
);
TYPE hashmap_num_type_t IS TABLE OF hashmap_num_type_rt;
stats_by_measure hashmap_num_type_t;
BEGIN
SELECT measure_id, measure_value
BULK COLLECT INTO stats_by_measure
FROM my_table;
FOR i IN 1..stats_by_measure.COUNT
LOOP
DBMS_OUTPUT.PUT_LINE('RECORD '||TO_CHAR(i)||' : ID - '||stats_by_measure(i).the_id||' MeasureVal: '||TO_CHAR(stats_by_measure(i).the_value));
END LOOP;
END;
您还可以定义游标并根据游标类型创建表类型(当然它仍然是行类型而不是对象类型)。
如果要将光标用作行类型,请尝试以下操作;
DECLARE
CURSOR c_measures IS
SELECT measure_id, measure_value
FROM my_table;
TYPE hashmap_num_type_t IS TABLE OF c_measures%ROWTYPE;
stats_by_measure hashmap_num_type_t;
BEGIN
OPEN c_measures;
FETCH c_measures
BULK COLLECT INTO stats_by_measure;
CLOSE c_measures;
FOR i IN 1..stats_by_measure.COUNT
LOOP
DBMS_OUTPUT.PUT_LINE('RECORD '||TO_CHAR(i)||' : ID - '||stats_by_measure(i).measure_id||' MeasureVal: '||TO_CHAR(stats_by_measure(i).measure_value));
END LOOP;
END;