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stranger
Asked: 2017-08-15 08:22:47 +0800 CST

如何编写存储过程以在 PL/SQL 中显示来自特定部门的员工信息？

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这些是我创建的表列表并为创建的表插入了值：

CREATE TABLE DEPARTMENT
(DEPARTMENT_ID NUMBER PRIMARY KEY,
 DEPARTMENT_NAME VARCHAR(30) NOT NULL
 );

 CREATE TABLE JOBS
 (JOB_ID NUMBER PRIMARY KEY,
  JOB_TITLE VARCHAR(35) NOT NULL,
  MIN_SALARY DECIMAL NOT NULL,
  MAX_SALARY DECIMAL NOT NULL
  );

 CREATE TABLE EMPLOYEES
(EMPLOYEE_ID NUMBER PRIMARY KEY,
 FIRST_NAME VARCHAR(20) NOT NULL,
 LAST_NAME VARCHAR(25) NOT NULL,
 EMAIL VARCHAR(25) NOT NULL,
 PHONE_NUMBER VARCHAR(20) NOT NULL,
 HIRE_DATE DATE NOT NULL,
 JOB_ID NUMBER NOT NULL,
 SALARY DECIMAL NOT NULL,
 DEPARTMENT_ID NUMBER NOT NULL,
 CONSTRAINT emp_job_fk FOREIGN KEY(JOB_ID) REFERENCES JOBS(JOB_ID),
 CONSTRAINT emp_department_fk FOREIGN KEY(DEPARTMENT_ID) REFERENCES DEPARTMENT(DEPARTMENT_ID)
 );

INSERT INTO DEPARTMENT (DEPARTMENT_ID,DEPARTMENT_NAME)
VALUES(1,'IT');
INSERT INTO DEPARTMENT (DEPARTMENT_ID,DEPARTMENT_NAME)
VALUES(2,'Sales');

INSERT INTO JOBS (JOB_ID,JOB_TITLE,MIN_SALARY,MAX_SALARY)
VALUES (1,'IT Administrator',250000.00,50000.00);
INSERT INTO JOBS (JOB_ID,JOB_TITLE,MIN_SALARY,MAX_SALARY)
VALUES (2,'Salesman',200000.00,40000.00);

INSERT INTO EMPLOYEES (EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,DEPARTMENT_ID)
VALUES (1,'Tony','Starc','[email protected]','0123456789',TO_DATE('15/1/2008','DD/MM/YYYY'),1,45000.00,1);
INSERT INTO EMPLOYEES (EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,DEPARTMENT_ID)
VALUES (2,'Bruce','Wayne','[email protected]','0123456788',TO_DATE('15/1/2009','DD/MM/YYYY'),1,40000.00,1);
INSERT INTO EMPLOYEES (EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,DEPARTMENT_ID)
VALUES (3,'Larry','Ellison','[email protected]','0123456787',TO_DATE('15/1/2010','DD/MM/YYYY'),1,30000.00,1);
INSERT INTO EMPLOYEES (EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,DEPARTMENT_ID)
VALUES (4,'Steve','Jobs','[email protected]','0123456786',TO_DATE('15/1/2011','DD/MM/YYYY'),2,35000.00,2);
INSERT INTO EMPLOYEES (EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,DEPARTMENT_ID)
VALUES (5,'Remy','Lebeau','[email protected]','0123456785',TO_DATE('15/1/2012','DD/MM/YYYY'),2,30000.00,2);
INSERT INTO EMPLOYEES (EMPLOYEE_ID,FIRST_NAME,LAST_NAME,EMAIL,PHONE_NUMBER,HIRE_DATE,JOB_ID,SALARY,DEPARTMENT_ID)
VALUES (6,'Clark','Kent','[email protected]','0123456784',TO_DATE('15/1/2013','DD/MM/YYYY'),2,20000.00,2);

为了显示来自特定部门的员工信息，我编写了以下程序：

CREATE OR REPLACE PROCEDURE pr_emps_per_dept_jc450912(p_dept_id NUMBER)
AS
BEGIN
DECLARE
emp_id EMPLOYEES.EMPLOYEE_ID%TYPE;
f_name EMPLOYEES.FIRST_NAME%TYPE;
l_name EMPLOYEES.LAST_NAME%TYPE;
job_name JOBS.JOB_TITLE%TYPE;
BEGIN
SELECT EMPLOYEE_ID,FIRST_NAME,LAST_NAME,JOB_TITLE
INTO emp_id,f_name,l_name,job_name
FROM EMPLOYEES,JOBS,DEPARTMENT
WHERE DEPARTMENT.DEPARTMENT_ID = EMPLOYEES.DEPARTMENT_ID
AND JOBS.JOB_ID = EMPLOYEES.JOB_ID
AND EMPLOYEES.DEPARTMENT_ID  = p_dept_id;
END;
END;

上面的存储过程已经编译成功。但是，当我尝试 [通过使用 EXECUTE 语句] 执行此过程时，我收到以下错误消息：

EXECUTE  pr_emps_per_dept_jc450912(1);

Error report -
ORA-01422: exact fetch returns more than requested number of rows
ORA-06512: at "SYS.PR_EMPS_PER_DEPT_JC450912", line 10
ORA-06512: at line 1
01422. 00000 -  "exact fetch returns more than requested number of rows"
*Cause:    The number specified in exact fetch is less than the rows returned.
*Action:   Rewrite the query or change number of rows requested
oracle stored-procedures

1 个回答

  1. Best Answer

    错误消息是不言自明的。您不能在单个原始变量中存储多个值。

    这也不是 MS SQL，您可以简单地将 SELECT 放入过程中，然后调用它来显示结果。PL/SQL 代码在服务器端运行。它不会在客户端上显示结果。您可以使用 PL/SQL 收集结果并将其返回给客户端。然后你可以以某种方式在客户端上显示它。

    下面是一个例子：

    create or replace function pr_emps_per_dept_jc450912 ( p_dept_id number )
  return sys_refcursor as
  l_cursor sys_refcursor;
begin
  open l_cursor for 
    select employee_id, first_name, last_name, job_title
    from employees, jobs, department
    where department.department_id = employees.department_id
    and jobs.job_id = employees.job_id
    and employees.department_id = p_dept_id;
  return l_cursor;
end;
/

    然后使用它：

    SQL> variable c refcursor
SQL> exec :c := pr_emps_per_dept_jc450912(1);

PL/SQL procedure successfully completed.

SQL> print :c

EMPLOYEE_ID FIRST_NAME           LAST_NAME                 JOB_TITLE
----------- -------------------- ------------------------- ----------------------------
          1 Tony                 Starc                     IT Administrator
          2 Bruce                Wayne                     IT Administrator
          3 Larry                Ellison                   IT Administrator
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