使用 for 循环索引插入表中

Question

尝试使用 for 循环将数据插入表中，对于表客户，我将数据放入 3 个分区。

这里是代码

begin
FOR var_1 in 1 .. 3
LOOP
INSERT into tmp_table
(
        SELECT cust_no FROM customer PARTITION (customer_PR$var_1)
        WHERE city='ba' AND first_name='john'
        AND salary=1000);
commit;
END LOOP;
END;
/

我得到结果

Error report -
ORA-02149: Specified partition does not exist
ORA-06512: at line 4
02149. 00000 -  "Specified partition does not exist"
*Cause:    Partition not found for the object.
*Action:   Retry with correct partition name.

但是当我正常运行时（对于分区1），

SELECT cust_no FROM customer PARTITION (customer_PR1);

我得到了预期的输出。

Answer 1

我认为您需要在这里使用动态 SQL 来实现您的目标 -

Declare
       sql_text varchar2(500);
begin
     FOR var_1 in 1 .. 3
     LOOP
         sql_text := 'INSERT into tmp_table
                      (SELECT cust_no FROM customer PARTITION (customer_PR' || var_1 || ')
                        WHERE city=''ba'' AND first_name=''john''
                          AND salary=1000)';
         EXECUTE IMMEDIATE sql_text;
         COMMIT;
     END LOOP;
END;
/

Answer 2

您不需要 3 个不同的查询，只需正确使用 PARTITION() 子句 - 指定所需的所有分区：

    INSERT into tmp_table
        SELECT cust_no 
        FROM customer PARTITION (customer_PR1,customer_PR3,customer_PR3)
        WHERE city='ba' AND first_name='john'
        AND salary=1000;

如果你真的需要动态 sql，你可以连接你的查询：

begin
FOR var_1 in 1 .. 3
LOOP
  execute immediate q'[
    INSERT into tmp_table
        SELECT cust_no FROM customer PARTITION (customer_PR]'||var_1||q'[
        WHERE city='ba' AND first_name='john'
        AND salary=1000)
        ]';
  commit;
END LOOP;
END;
/

或者根据您的分区规则，您可以使用partition for 子句：

begin
FOR partitioning_key in {your_partitioning keys}
LOOP
INSERT into tmp_table
(
        SELECT cust_no FROM customer PARTITION FOR (partitioning_key)
        WHERE city='ba' AND first_name='john'
        AND salary=1000);
commit;
END LOOP;
END;
/

https://www.oracle.com/technical-resources/articles/database/sql-11g-partitioning.html