SQL 表达式类型错误

Question

正在运行 SQL 开发人员

进行以下操作

declare
    type hType is table of number not null
        index by BINARY_INTEGER;
    items_v hType;
    references_v hType;
    keyId number;

begin   
    keyId := 1234567;

    select i.item bulk collect into items_v
    from items i
    where i.item_id = ...;

    select j.reference bulk collect into references_v
    from references j
    where j.reference = ..
        and j.item in items_v;
end;

I get ORA-06550: line 23, column 31: PLS-00382: expression is of the wrong type

即使 j.item 和 i.item 也是类型 NUMBER;

Answer 1

在查询的 REFERENCES 部分，您不能那样使用 ITEMS_V 集合；考虑改用这样的东西：

for i in items_v.first .. items_v.last loop
  select j.reference bulk collect into references_v
    from references j
    where j.reference = ..
        and j.item_id = items_v(i);
end loop;

可能有更聪明的方法来做到这一点（希望其他人会告诉您如何做），但这也应该有效。

Answer 2

直到 11g，您不能在 PLSQL 范围内声明 TYPE 并在 PLSQL 块内的 SQL 语句中使用它。如果要在 PLSQL 块下使用它，则需要在 SQL 范围内声明 TYPE 。此外，如果您想在 IN 子句中使用一个集合，则可以使用 MEMBER OF。见下文：

类型创建于 SQL 范围。

SQL> CREATE OR REPLACE TYPE HTYPE IS TABLE OF NUMBER NOT NULL ;
        /

Type created.

匿名块

SQL> DECLARE   
  2       ITEMS_V                       HTYPE;
  3       REFERENCES_V                  HTYPE;
  4       KEYID                         NUMBER;
  5  BEGIN
  6       KEYID := 1234567;
  7  
  8       SELECT I.ITEM
  9       BULK COLLECT INTO ITEMS_V
 10         FROM ITEMS I
 11        WHERE I.ITEM_ID = 1;
 12  
 13       SELECT J.REFERENCE
 14       BULK COLLECT INTO REFERENCES_V
 15         FROM REFERENCES J
 16        WHERE J.REFERENCE = 1
 17        AND J.ITEM MEMBER OF ITEMS_V;--<--Used Member of to check elements of colection
 18  END;
 19  /

PL/SQL procedure successfully completed.

您可以使用 IN 子句作为：

SQL> DECLARE   
  2       ITEMS_V                       HTYPE;
  3       REFERENCES_V                  HTYPE;
  4       KEYID                         NUMBER;
  5  BEGIN
  6       KEYID := 1234567;
  7  
  8       SELECT I.ITEM
  9       BULK COLLECT INTO ITEMS_V
 10         FROM ITEMS I
 11        WHERE I.ITEM_ID = 1;
 12  
 13       SELECT J.REFERENCE
 14       BULK COLLECT INTO REFERENCES_V
 15         FROM REFERENCES J
 16        WHERE J.REFERENCE = 1
 17        AND J.ITEM IN (SELECT COLUMN_VALUE FROM TABLE(ITEMS_V)); --<-- Used IN Clause.
 18  END;
 19  /

PL/SQL procedure successfully completed.

SQL 表达式类型错误

SQL expression is of wrong type

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