Oracle存储过程: return both result set and out parameters

Question

Oracle存储过程有OUT参数并返回结果集，例如

create or replace procedure foo(empId IN NUMBER, maxSalary OUT NUMBER) AS BEGIN
    select * from Employee e where e.id >=empId;
    select max(salary) into maxSalary from Employee;
END;

错误:

PLS-00428: an INTO clause is expected in this SELECT statement

Mysql存储过程既可以返回结果集，也可以返回out参数。 oracle db怎么做？

Answer 1

在 Oracle 中，您不能在没有 INTO 子句的情况下运行直接选择语句。

如果您使用的是 Oracle 12c 及更高版本，您可以使用 REF CURSOR 和 DBMS_SQL.RETURN_RESULT

create or replace procedure foo(empId IN NUMBER, maxSalary OUT NUMBER) AS
q SYS_REFCURSOR;
 BEGIN
    OPEN q FOR select * from Employee e where e.id >=empId;
     DBMS_SQL.return_result (q); -- This will display the result
    select max(salary) into maxSalary from Employee;
END;

对于以前的版本(11g，10g)，您可以将 REF CURSOR 作为 OUT 参数并从 sqlplus 或 TOAD 打印它通过作为脚本运行。

create or replace procedure foo(empId IN NUMBER, maxSalary OUT NUMBER,
   q OUT SYS_REFCURSOR) AS

     BEGIN
        OPEN q FOR select * from Employee e where e.id >=empId;
        select max(salary) into maxSalary from Employee;
    END;

在调用过程之前定义绑定(bind)变量。

VARIABLE v_empID NUMBER
VARIABLE v_maxsalary NUMBER
VARIABLE v_q REFCURSOR

EXEC :v_empID := 101
EXEC foo(:v_empID,:v_maxsalary,:v_q ) 
PRINT v_q -- This will display the result from the query.