如何将sql查询传递给过程作为参数？

Question

create or replace procedure sqldynamic(sqlquery sys_refcursor)
is 
cursor c1 is sqlquery;
begin
open c1;

end;

Answer 1

如果您想将SQL查询作为参数传递，请尝试以下操作

CREATE OR REPLACE PROCEDURE sqldynamic (sqlquery IN SYS_REFCURSOR)
IS
BEGIN
   LOOP
      FETCH sqlquery INTO <your variables>;
      EXIT WHEN sqlquery %NOTFOUND;
   END LOOP;

END

并执行上述步骤

DECLARE
   my_cursor SYS_REFCURSOR;
BEGIN
   OPEN my_cursor FOR
      SELECT  <columns>
      FROM <your_table>;
   sqldynamic (my_cursor);
   CLOSE my_cursor;
END;

在<>替换任何认为必要的内容

例如

CREATE OR REPLACE PROCEDURE sqldynamic (sqlquery IN SYS_REFCURSOR)
IS
   v_emp_number   employees.emp_number%TYPE;
   v_emp_name     employees.employee_name%TYPE;
BEGIN
   LOOP
      FETCH sqlquery INTO v_emp_number, v_emp_name;
      DBMS_OUTPUT.put_line (
     'v_emp_number   ' || v_emp_number || '  v_emp_name  ' || v_emp_name);
      EXIT WHEN sqlquery%NOTFOUND;
   END LOOP;
END;

并以PL / SQL块的形式执行上述过程

DECLARE
   my_cursor   SYS_REFCURSOR;
BEGIN
   OPEN my_cursor FOR SELECT emp_number, employee_name FROM employees WHERE emp_number=108;

   sqldynamic (my_cursor);

   CLOSE my_cursor;
END;

Answer 2

您不必打开游标，它已经打开。 只是使

create or replace procedure sqldynamic(sqlquery sys_refcursor) is 
begin
   LOOP
      FETCH sqlquery INTO ...;
      EXIT WHEN sqlquery%NOTFOUND; 
      ...
   END LOOP;

end;

您将这样调用该过程：

DECLARE
   curSel SYS_REFCURSOR;
BEGIN
   OPEN curSel FOR ...;
   sqldynamic(curSel);

END;