具有三个选择语句的 Oracle SQL 存储过程

Question

我正在将当前设置为通过 JAVA 运行的 Oracle SQL 查询转换为存储过程。基本上，同一个表中有三个带有日期范围参数的选择语句。

CREATE OR REPLACE PROCEDURE get_users(startdate_in IN DATE,
                                      enddate_in   IN DATE)
IS
 BEGIN

    DELETE FROM temp_table;

    INSERT INTO temp_table (id, role, date_used, count_s)
      SELECT
        EMPLOYEE.CUSTOMERID                    AS user_id,
        'Customer'                             AS role_,
        to_char(EMPLOYEE.STARTEDON, 'MM-YYYY') AS req_month,
        count(EMPLOYEE.SUBJECT)                AS subj_count
      FROM RCUSER.EMPLOYEE EMPLOYEE
      WHERE EMPLOYEE.STATEID NOT IN (4, 9, 16, 31, 36)
            AND (EMPLOYEE.AGENTID = 0)
            AND (EMPLOYEE.STARTEDON >= to_date(startdate_in, 'yyyy-mm-dd'))
            AND (EMPLOYEE.STARTEDON < to_date(enddate_in, 'yyyy-mm-dd'))
      GROUP BY CUSTOMERID, to_char(EMPLOYEE.STARTEDON, 'MM-YYYY')

      UNION

      SELECT
        EMPLOYEE.PERFORMERID                   AS user_id,
        'Performer'                            AS role_,
        to_char(EMPLOYEE.STARTEDON, 'MM-YYYY') AS req_month,
        count(EMPLOYEE.SUBJECT)                AS subj_count
      FROM RCUSER.EMPLOYEE EMPLOYEE
      WHERE EMPLOYEE.PEID IN (1, 4, 6)
            AND EMPLOYEE.STATEID NOT IN (4, 9, 16, 31, 36)
            AND (EMPLOYEE.AGENTID = 0)
            AND (EMPLOYEE.STARTEDON >= to_date(startdate_in, 'yyyy-mm-dd'))
            AND (EMPLOYEE.STARTEDON < to_date(enddate_in, 'yyyy-mm-dd'))
      GROUP BY PERFORMERID, to_char(EMPLOYEE.STARTEDON, 'MM-YYYY')

      UNION

      SELECT
        employee.performerid                   AS user_id,
        'Approver'                             AS role_,
        to_char(EMPLOYEE.STARTEDON, 'MM-YYYY') AS req_month,
        count(EMPLOYEE.SUBJECT)                AS subj_count
      FROM RCUSER.EMPLOYEE EMPLOYEE
      WHERE EMPLOYEE.PEID IN (2, 3)
            AND EMPLOYEE.STATEID NOT IN (4, 9, 16, 31, 36)
            AND (EMPLOYEE.AGENTID = 0)
            AND (EMPLOYEE.STARTEDON >= to_date(startdate_in, 'yyyy-mm-dd'))
            AND (EMPLOYEE.STARTEDON < to_date(enddate_in, 'yyyy-mm-dd'))
      GROUP BY PERFORMERID, to_char(EMPLOYEE.STARTEDON, 'MM-YYYY');

  END;

运行时，不会将任何内容写入TEMP_TABLE。但是当我对日期范围进行硬编码时，我会得到一些数据。

Answer 1

CREATE OR REPLACE PROCEDURE GET_PEOPLE(startdate_in IN DATE, enddate_in IN DATE)
IS

BEGIN
INSERT INTO temp_table
(ID, COL1, COL2, ROLE_,START_DATE,END_DATE)
VALUES
(select * from
(Select col1, col2, 'Customer' as Role_, col3, col3
where col1 in (1,2)
UNION
Select col1, col2, 'Authore' as Role_, col3, col3
where col1 in (3,4)
UNION
Select col1, col2,  'Buyer' as Role_,col3, col3
where col1 in (5,6))
where col3 between STARTDATE_IN and ENDDATE_IN;

END;

当然，编写好的代码还有很多事情要做：

• 添加断言 startdate_in 和 enddate_in 是有效日期并且在预期值范围内
• 而不是临时表，而是返回一个 sys refcursor，其中包含用于在应用程序中处理的结果
• 使用全局临时表减少撤消日志

Answer 2

您可以使用以下形式的单个 SQL 语句来提高效率：

Select col1,
       col2,
       case
         when col1 in (1,2) then 'Customer'
         when col1 in (3,4) then 'Authore'
         when col1 in (5,6) then 'Buyer'
       end as Role_,
       col3(@startDate),
       col3(@endDate)
where col1 in (1,2,3,4,5,6);

如果您需要将其写入临时表，则只需将其插入...

create or replace procedure my_procedure(start_date date, end_date date)
is
begin 
insert into temp_table (... column names ...)
Select col1,
       col2,
       case
         when col1 in (1,2) then 'Customer'
         when col1 in (3,4) then 'Authore'
         when col1 in (5,6) then 'Buyer'
       end as Role_,
       col3(my_procedure.start_date),
       col3(my_procedure.end_date)
where col1 in (1,2,3,4,5,6);
end;
/

虽然不知道你所说的 col3(@startDate) 是什么意思......也许......

create or replace procedure my_procedure(start_date date, end_date date)
is
begin 
insert into temp_table (... column names ...)
Select col1,
       col2,
       case
         when col1 in (1,2) then 'Customer'
         when col1 in (3,4) then 'Authore'
         when col1 in (5,6) then 'Buyer'
       end as Role_,
       my_procedure.start_date,
       my_procedure.end_date
where col1 in (1,2,3,4,5,6);
end;
/