Oracle存储过程,游标使用

    CREATE OR REPLACE PROCEDURE proc_in_out_test(var_empno NUMBER,  
                                                 var_ename OUT VARCHAR2) IS  
    BEGIN  
      SELECT ename INTO var_ename FROM emp WHERE empno = var_empno;  
    EXCEPTION  
      WHEN no_data_found THEN  
        raise_application_error(-20000, ‘该员工不存在‘);  
    END;  

    SQL> var vempno number;  
    SQL> var vename varchar2(10);  
    SQL> exec :vempno:=7934;  
    SQL> exec proc_in_out_test(:vempno,:vename);  
    PL/SQL procedure successfully completed  
    vename  
    ---------  
    MILLER  
      
    SQL> exec :vempno:=7935;  
    SQL> exec proc_in_out_test(:vempno,:vename);  
      
    begin proc_in_out_test(:vempno,:vename); end;  
      
    ORA-20000: 该员工不存在  
    ORA-06512: 在 "SCOTT.PROC_IN_OUT_TEST", line 7  
    ORA-06512: 在 line 1  

    DECLARE  
      v_empname emp.ename%TYPE;  
      v_job     emp.job%TYPE;  
      v_deptno  emp.deptno%TYPE;  
      CURSOR emp_test IS --声明游标  
        SELECT ename, job FROM emp WHERE deptno = v_deptno;  
    BEGIN  
      v_deptno := 10;  
      OPEN emp_test; --打开游标  
      --循环游标  
      LOOP  
        FETCH emp_test  
          INTO v_empname, v_job; --取值  
        EXIT WHEN emp_test%NOTFOUND; --当没有记录时退出循环  
        dbms_output.put_line(‘empname=‘ || v_empname || ‘,job=‘ || v_job);  
      END LOOP;  
      CLOSE emp_test;  
    END;  
    --游标的属性有：%FOUND,%NOTFOUNRD,%ISOPEN,%ROWCOUNT;  
    --%FOUND:已检索到记录时，返回true  
    --%NOTFOUNRD：检索不到记录时，返回true  
    --%ISOPEN:游标已打开时返回true  
    --%ROWCOUNT:代表检索的记录数，从1开始  

    CREATE OR REPLACE PROCEDURE cursorvariabletest(p_table IN VARCHAR2) IS  
      TYPE t_emp_dept IS REF CURSOR; --定义游标变量类型  
      v_cursorvar t_emp_dept; --声明游标变量  
      
      v_empno emp.empno%TYPE;  
      v_ename emp.ename%TYPE;  
      v_job   emp.job%TYPE;  
      v_dname dept.dname%TYPE;  
      v_loc   dept.loc%TYPE;  
      
    BEGIN  
      IF p_table = ‘emp‘ THEN  
        v_empno := 7369;  
        OPEN v_cursorvar FOR  
          SELECT ename, job FROM emp WHERE empno = v_empno; --打开游标变量  
      ELSE  
        IF p_table = ‘dept‘ THEN  
          OPEN v_cursorvar FOR  
            SELECT dname, loc FROM dept; --打开游标变量  
        ELSE  
          raise_application_error(-20000, ‘请输入emp或dept!‘);  
        END IF;  
      END IF;  
      
      LOOP  
        IF p_table = ‘emp‘ THEN  
          FETCH v_cursorvar  
            INTO v_ename, v_job;  
          EXIT WHEN v_cursorvar%NOTFOUND;  
          dbms_output.put_line(‘ename=‘ || v_ename || ‘,job=‘ || v_job);  
        ELSE  
          FETCH v_cursorvar  
            INTO v_dname, v_loc;  
          EXIT WHEN v_cursorvar%NOTFOUND;  
          dbms_output.put_line(‘dname=‘ || v_dname || ‘,loc=‘ || v_loc);  
        END IF;  
      END LOOP;  
      CLOSE v_cursorvar; --关闭游标变量  
    END;