Oracle SQL%ROWCOUNT 语句总是返回 1

Question

我在 Oracle 中有一个简单的表 USERS，有 2 列 ID 和 USERNAME。 ID 是主键，使用触发器自动递增。

我正在使用这样的过程插入或更新记录

CREATE OR REPLACE PROCEDURE SaveUser(UID NUMBER, UN VARCHAR2, Row_Count OUT NUMBER) IS
BEGIN
    IF(UID > 0) THEN
        UPDATE USERS SET USERNAME = UN WHERE ID = UID;
    ELSE
        INSERT INTO USERS(USERNAME) VALUES(UN);
    END IF;

    Row_Count := SQL%ROWCOUNT;
END;

我这样调用程序：

VARIABLE Row_Count NUMBER;
EXEC SaveUser(50, 'Username_1', Row_Count);
PRINT Row_Count;

问题是我将 50 作为第一个参数传递，但在表中没有ID 50 的行。但我得到了 1 作为结果。即使该行没有更新，SQL%ROWCOUNT 语句也会返回 1。谁能帮我解决这个问题？

上面的代码是简化的，具体代码在这里

CREATE OR REPLACE PROCEDURE SaveEmployee(ID NUMBER, User_Name VARCHAR2, Emp_Password VARCHAR2, Emp_Full_Name VARCHAR2, Emp_Date_Of_Birth DATE, Emp_Gender_ID NUMBER, Emp_Work_Type_ID NUMBER, Emp_Salary FLOAT, Emp_Email VARCHAR2, Row_Count OUT NUMBER) IS
    Username_Row_Count NUMBER := 0;
    Email_Row_Count NUMBER := 0;
BEGIN
    IF(ID > 0) THEN
        SELECT COUNT(1) INTO Username_Row_Count FROM EMPLOYEES WHERE LOWER(USERNAME) = LOWER(User_Name) AND EMPLOYEE_ID <> ID;
        SELECT COUNT(1) INTO Email_Row_Count FROM EMPLOYEES WHERE LOWER(EMAIL) = LOWER(Emp_Email) AND EMPLOYEE_ID <> ID;

        IF(Username_Row_Count = 0 AND Email_Row_Count = 0) THEN
            UPDATE EMPLOYEES
            SET USERNAME = LOWER(User_Name), PASSWORD = Emp_Password, FULL_NAME = Emp_Full_Name, DATE_OF_BIRTH = Emp_Date_Of_Birth, GENDER_ID = Emp_Gender_ID, WORK_TYPE_ID = Emp_Work_Type_ID, SALARY = Emp_Salary, EMAIL = LOWER(Emp_Email)
            WHERE EMPLOYEE_ID = ID;
        END IF;
    ELSE
        SELECT COUNT(1) INTO Username_Row_Count FROM EMPLOYEES WHERE LOWER(USERNAME) = LOWER(User_Name);
        SELECT COUNT(1) INTO Email_Row_Count FROM EMPLOYEES WHERE LOWER(EMAIL) = LOWER(Emp_Email);

        IF(Username_Row_Count = 0 AND Email_Row_Count = 0) THEN
            INSERT INTO EMPLOYEES(USERNAME, PASSWORD, FULL_NAME, DATE_OF_BIRTH, GENDER_ID, WORK_TYPE_ID, SALARY, EMAIL, LOGIN_ATTEMPTS)
            VALUES(LOWER(User_Name), Emp_Password, Emp_Full_Name, Emp_Date_Of_Birth, Emp_Gender_ID, Emp_Work_Type_ID, Emp_Salary, LOWER(Emp_Email), 0);
        END IF;
    END IF;

    Row_Count := SQL%ROWCOUNT;
END;

Answer 1

我无法重现你所说的：

SQL> select * from users;

no rows selected

SQL> declare
  2    uid number := 50;
  3  begin
  4    if uid > 0 then
  5       update users set username = '&&un' where id = uid;
  6    else
  7       insert into users (username) values ('&&un');
  8    end if;
  9    dbms_output.put_line(sql%rowcount);
 10  end;
 11  /
Enter value for un: 50
0                              --> this is SQL%ROWCOUNT

PL/SQL procedure successfully completed.

SQL>

您发布的代码无效（没有NUBER 数据类型）。如果您发布了真正有效的内容，这将有所帮助，因为 - 正如您所说的那样 - 我们无法确定您声称的内容是否真的是正确的。请复制/粘贴您自己的 SQL*Plus 会话（就像我所做的那样），以便我们了解您的真实情况以及 Oracle 的响应方式。

Answer 2

更新后添加SQL%ROWCOUNT获取更新计数

UPDATE EMPLOYEES
            SET USERNAME = LOWER(User_Name), PASSWORD = Emp_Password, FULL_NAME = Emp_Full_Name, DATE_OF_BIRTH = Emp_Date_Of_Birth, GENDER_ID = Emp_Gender_ID, WORK_TYPE_ID = Emp_Work_Type_ID, SALARY = Emp_Salary, EMAIL = LOWER(Emp_Email)
            WHERE EMPLOYEE_ID = ID;
Row_Count := SQL%ROWCOUNT;

Answer 3

现在更清楚了。

这段代码：

SELECT COUNT(1) INTO Username_Row_Count FROM EMPLOYEES WHERE LOWER(USERNAME) = LOWER(User_Name) AND EMPLOYEE_ID <> ID;
SELECT COUNT(1) INTO Email_Row_Count FROM EMPLOYEES WHERE LOWER(EMAIL) = LOWER(Emp_Email) AND EMPLOYEE_ID <> ID;

必须更新Username_Row_Count和Email_Row_Count的值，使条件

IF(Username_Row_Count = 0 AND Email_Row_Count = 0) THEN

总是错误的。并且永远不会执行更新。结果，在您的 Row_Count 变量中，您将获得最后一次选择的结果，即 1 行。