How to set Oracle bind variables when using SQLPlus?

问题

How do I set Oracle bind variables when using SQLPlus?

Example:

SELECT orders.order_no FROM orders WHERE orders.order_date BETWEEN :v1 AND :v2

How do I set the dates of :v1 and :v2?

回答1:

Notice the following:

• VARIABLE is a SQLPlus command. You don't end it with a semicolon (;).

• In the VARIABLE command, you do not precede the variable name with colon (:).

• Bind variable can't be of data type "date" - they are some sort of character value.

• For that reason, IN YOUR CODE you must use to_date() with the proper format model, or some other mechanism, to convert string to date. That is currently missing in your code. NEVER compare dates to strings!

Brief demo below.

SQL> variable v1 varchar2(20)

SQL> exec :v1 := '2015/12/22';
PL/SQL procedure successfully completed.

SQL> select 1 as result from dual where to_date(:v1, 'yyyy/mm/dd') < sysdate;

    RESULT
----------
         1

回答2:

In common you may use define and use variable with &

define x = 12 ;
select &x from dual;

Or varable

variable x refcursor;
begin
 open :x for select * from dual connect by level < 11;
end;
/
print x

来源：https://stackoverflow.com/questions/39993497/how-to-set-oracle-bind-variables-when-using-sqlplus