oracle - 在 PL/SQL 中，如何从用户定义函数返回查询结果？

Question

我正从 SQL Server 转向 Oracle 11g，我正在尝试使用 SQL Developer 创建一个简单的函数 (getIDs)，该函数将返回查询结果 (SELECT id FROM employee)。我在互联网上找到的任何东西似乎都不起作用。这是我正在尝试的代码:

测试包:

CREATE OR REPLACE PACKAGE test_pkg AS 

    TYPE number_table IS TABLE OF NUMBER;

    FUNCTION getIDs RETURN number_table;

END TEST_PKG;

test_pkg 主体:

CREATE OR REPLACE PACKAGE BODY test_pkg AS

    FUNCTION getIDs RETURN number_table AS
        ids number_table;
    BEGIN
        SELECT id  BULK COLLECT INTO ids 
        FROM employee;
        RETURN ids;
    END getIDs;

END test_pkg;

SQL 开发人员工作表:

SELECT * 
FROM TABLE(test_pkg.getIDs());

-- The above gives 
-- ORA-00902: invalid datatype


DECLARE
    nums test_pkg.number_table;
BEGIN
    SELECT column_value BULK COLLECT INTO nums
    FROM TABLE(test_pkg.getIDs);
END;

-- The above gives:
-- PLS-00642: local collection types not allowed in SQL statements
-- PL/SQL: ORA-22905: cannot access rows from a non-nested table item

如果有人能看出我在这里做错了什么，我将不胜感激。我花了很多时间寻找答案，这似乎应该可行。最后，我还想在其他函数、过程和查询中查询 getIDs() 函数的结果。

Answer 1

将类型创建为独立对象

SQL> create or replace
  2  type number_table IS TABLE OF NUMBER;
  3  /

Type created.

SQL>
SQL> CREATE OR REPLACE PACKAGE test_pkg AS
  2
  3      FUNCTION getIDs RETURN number_table;
  4
  5  END TEST_PKG;
  6  /

Package created.

SQL>
SQL>
SQL> CREATE OR REPLACE PACKAGE BODY test_pkg AS
  2
  3      FUNCTION getIDs RETURN number_table AS
  4          ids number_table;
  5      BEGIN
  6          SELECT employee_Id  BULK COLLECT INTO ids
  7          FROM employees;
  8          RETURN ids;
  9      END getIDs;
 10
 11  END test_pkg;
 12  /

Package body created.

SQL> sho err
No errors.
SQL>
SQL> SELECT *
  2  FROM TABLE(test_pkg.getIDs());

COLUMN_VALUE
------------
         100
         101
         102
         103
         104
         105
         106
         107
         108
         109
         110
         111
         112
         113
         114
         115
         116
         117
         118
         119
         120
         121
         122
         123
         124
         125
         126
         127
         128
         129
         130
         131
         132
         133
         134
         135
         136
         137
         138
         139
         140
         141
         142
         143
         144
         145
         146
         147
         148
         149
         150
         151
         152
         153
         154
         155
         156
         157
         158
         159
         160
         161
         162
         163
         164
         165
         166
         167
         168
         169
         170
         171
         172
         173
         174
         175
         176
         177
         178
         179
         180
         181
         182
         183
         184
         185
         186
         187
         188
         189
         190
         191
         192
         193
         194
         195

COLUMN_VALUE
------------
         196
         197
         198
         199
         200
         201
         202
         203
         204
         205
         206

107 rows selected.

SQL>
SQL>
SQL> DECLARE
  2      nums number_table;
  3  BEGIN
  4      SELECT column_value BULK COLLECT INTO nums
  5      FROM TABLE(test_pkg.getIDs);
  6  END;
  7  /

PL/SQL procedure successfully completed.

SQL>
SQL>
SQL>