使用多个员工无法正常工作的过滤过程

问题描述

我正在尝试按员工进行过滤。如果我通过单个雇员,则效果很好,但是当我通过多个雇员时,则不起作用。我将多个emp使用CTE作为逗号分隔的字符串。我在下面附加了示例代码-我们将不胜感激任何帮助。我尝试使用上层(从dept_emp中选择ALL_EMP),但单行子查询返回了多行-如何使其适用于多名员工?

//full code here

Create or replace procedure Emp_Test(

v_empl IN VARCHAR2

)
AS

OPEN  emp_recordset for

with dept_emp as
(select REGEXP_SUBSTR(v_empl,'[^,]+',+1,LEVEL) as ALL_EMP
FROM DUAL
CONNECT BY LEVEL <= LENGTH(REGEXP_REPLACE(v_empl,]+'))+1)

select r.name,r.city,e.manager,t.cross_dept,t.dtpt_num
from Employee r
join Dept t on r.emp_id = t.emp_id

where 
(v_empl is null or 
(case when r.emp_status = 'A' and t.cross_dept = 'DEV'
then emp.get_salary(r.v_empl)
else r.v_empl end) = upper(v_empl)
order by r.emp_id;
end  Emp_Test;
//procedure

v_empl IN VARCHAR2

--------
--------
with dept_emp as
(select REGEXP_SUBSTR(v_empl,]+'))+1)

-------- employee r //tbl
--------dept t
//this is working only for single emp,need to work for multiple emp which are  in dept_emp CTE

//how can I make use of dept_emp so it can filter for multiple emp

where 
(v_empl is null or 
(case when r.emp_status = 'A' and t.cross_dept = 'DEV'
then emp.get_salary(r.v_empl)
else r.v_empl end) = upper(v_empl)

also tried this upper(select ALL_EMP from dept_emp) but I am getting single-row subquery returns more than one row error message

解决方法

我认为,如果我对问题的理解正确,那么您希望将过程的输入参数评估为单个值或它们的集合。您不能将select语句检索的表中的单个值与值的集合进行比较。那永远都行不通。

在这种情况下,您可以尝试类似的操作

测试用例

SQL> create table emp ( emp_id number,name varchar2(100),manager varchar2(100),emp_status varchar2(1) ) ;

Table created.

SQL> insert into emp values ( 1,'John','Bill','A' ) ;

SQL> insert into emp values ( 2,'Mike','A' ) ;

SQL> insert into emp values ( 3,'Sara','A' ) ;

SQL> insert into emp values ( 4,'Dany','A' ) ;

SQL> insert into emp values ( 5,'Mila','Anne','B' ) ;

SQL> insert into emp values ( 6,'Jean','B' ) ;

1 row created.

1 row created.

1 row created.

1 row created.

1 row created.

1 row created.

SQL> commit ;

Commit complete.

SQL> create table dept ( dtpt_num number,cross_dept varchar2(3) ) ;

Table created.

SQL> insert into dept values ( 100,'DEV' ) ;

1 row created.

SQL> insert into dept values ( 200,'HRM' ) ;

1 row created.

SQL> col name for a20
SQL> col manager for a20
SQL> select * from emp ;

    EMP_ID NAME                 MANAGER              E
---------- -------------------- -------------------- -
         1 John                 Bill                 A
         2 Mike                 Bill                 A
         3 Sara                 Bill                 A
         4 Dany                 Bill                 A
         5 Mila                 Anne                 B
         6 Jean                 Anne                 B

6 rows selected.

SQL> select * from dept ;

  DTPT_NUM CRO
---------- ---
       100 DEV
       200 HRM

现在,让我们构建一个演示函数以根据id随机获得薪水

SQL> create or replace function get_salary ( pempid in number )
return number deterministic
is
out_sal number;
begin
    select round(dbms_random.value(1000,3000),0) into out_sal from dual ;
        return out_sal ;
end;
/

Function created.

让我们在emp表中添加一个新列,以便按部门将两个表连接起来

SQL> alter table emp add dept_id number ;

Table altered.

SQL> update emp set dept_id = ( case when EMP_STATUS = 'A' then 100 else 200 end ) ;

6 rows updated.

SQL> commit ;

Commit complete.

SQL> select * from emp
  2  ;

    EMP_ID NAME                 MANAGER              E    DEPT_ID
---------- -------------------- -------------------- - ----------
         1 John                 Bill                 A        100
         2 Mike                 Bill                 A        100
         3 Sara                 Bill                 A        100
         4 Dany                 Bill                 A        100
         5 Mila                 Anne                 B        200
         6 Jean                 Anne                 B        200

6 rows selected.

我们现在可以连接两个表并使用演示功能获取随机薪水

SQL> select e.emp_id,e.name,e.manager,d.cross_dept,d.dtpt_num,get_salary(e.emp_id) as salary
from emp e
join Dept d on e.DEPT_ID = d.dtpt_num  ;

    EMP_ID NAME                 MANAGER              CRO   DTPT_NUM     SALARY
---------- -------------------- -------------------- --- ---------- ----------
         1 John                 Bill                 DEV        100       2129
         2 Mike                 Bill                 DEV        100       1215
         3 Sara                 Bill                 DEV        100       2930
         4 Dany                 Bill                 DEV        100       1347
         5 Mila                 Anne                 HRM        200       1664
         6 Jean                 Anne                 HRM        200       1770

6 rows selected.

现在,让我们构建一个过程,该过程将在输入参数可能是单个员工或他们的列表(用逗号分隔)时将其考虑在内,并将结果存储在临时表中(仅出于演示目的,您可以使用sys_refcursor对象)

SQL> create table tmp_results as
select e.emp_id,get_salary(e.emp_id) as salary
from emp e
join Dept d on e.DEPT_ID = d.dtpt_num
where 1 = 2 ; 

Table created.

create or replace procedure emp_test ( pemployee in varchar2 )
is
v_counter_records pls_integer;
v_num_of_values   pls_integer;
curr_val          varchar2(10);
begin
    v_counter_records := regexp_count ( pemployee,',1,'i' ); 
    if v_counter_records = 0
    then 
        insert into  tmp_results 
        select e.emp_id,get_salary(e.emp_id) as salary
        from emp e
        join Dept d on e.DEPT_ID = d.dtpt_num 
        where e.emp_id = to_number(pemployee) ;
    else 
        v_num_of_values := v_counter_records + 1;
        for rec in 1 .. v_num_of_values
        loop 
            curr_val := regexp_substr( pemployee,'[^,]+',rec );
            insert into  tmp_results 
            select e.emp_id,get_salary(e.emp_id) as salary
            from emp e
            join Dept d on e.DEPT_ID = d.dtpt_num 
            where e.emp_id = to_number(curr_val);
        end loop;
    end if;
end;
/

Procedure created.

SQL> exec emp_test( '1,2,3' );

PL/SQL procedure successfully completed.

SQL> select * from tmp_results ;

    EMP_ID NAME                 MANAGER              CRO   DTPT_NUM     SALARY
---------- -------------------- -------------------- --- ---------- ----------
         1 John                 Bill                 DEV        100       2386
         2 Mike                 Bill                 DEV        100       1531
         3 Sara                 Bill                 DEV        100       2202

注意事项

  • 我的示例只是向您展示如何在过程输入中拆分用作单个参数的列表。
  • 您还可以更改查询以使用IN而不是=来在存在多个值时评估条件。
  • 我没有为该函数包括任何特殊的逻辑,因为出于示例的目的,它不是必需的。
  • 您也可以使用WITH语句来获取待比较的员工列表,但是在使用该CTE结构时,您的问题还不清楚。
,

您必须使用in (select upper(ALL_EMP) from dept_em)。 函数upper需要单个值,因此您不能将其应用于返回多行的选择。 出于相同的原因,您必须在where子句中使用in而不是=