Question

error screenshot我正在尝试在Toad中执行以下程序。

create or replace procedure tst_excp as
    var_sal number;
    var_empid number;
    var_excp exception;
begin
    select sal into var_sal from emp
    where  empno = &var_empid;

    if var_sal < 4500 then
        raise var_excp; 
    end if;
exception
    when var_excp then
        dbms_output.put_line ('The salary is low');
end;

我收到错误： where empno = &var_empid;

错误信息是：

PL/SQL: ORA-00936: missing expression

我打算在执行时将值传递给变量。

Answer 1

&是sqlplus（和TOAD，SQL Developer和PL / SQL Developer）运行时变量的一部分。它将在代码中提示您执行（在编译程序的情况下）输入以进行替换。

如果你想获得程序的输入，那么它将被添加到每次运行的where子句中，你需要将它作为输入变量接收：

create or replace procedure tst_excp (var_empid in number) as -- << changed here
var_sal number;
var_empid number;
var_excp exception;
begin
    select sal into var_sal from emp
    where empno = var_empid; -- << changed here too

        if var_sal < 4500 then
        raise var_excp;
    end if;
    exception
    when var_excp then
    dbms_output.put_line ('The salary is low');
end;

程序错误与＆＃39;＆amp;＆＃39;

1 个答案: