PL/SQL之遊標屬性詳解
阿新 • • 發佈:2019-02-19
遊標屬性分為以下幾種:
cursor_name%FOUND:判斷最後一次FETCH抓取資料是否成功,成功為TRUE,否則為FALSE;
cursor_name%NOTFOUND:與%FOUND相反;
cursor_name%ISOPEN:判斷遊標是否開啟,開啟為TRUE,否則為FALSE;
cursor_name%ROWCOUNT:返回從遊標中讀取的記錄條數;
四大屬性綜合例項:
DECLARE --定義遊標 CURSOR cursor_test IS SELECT NAME,age FROM mytest; v_name mytest.name%TYPE; v_age mytest.age%TYPE; BEGIN --開啟遊標 OPEN cursor_test; --%isopen IF cursor_test%ISOPEN THEN DBMS_OUTPUT.PUT_LINE('遊標開啟'); END IF; FETCH cursor_test INTO v_name,v_age; --%found WHILE cursor_test%FOUND LOOP DBMS_OUTPUT.PUT_LINE(v_name); DBMS_OUTPUT.PUT_LINE(v_age); --%rowcount DBMS_OUTPUT.PUT_LINE(cursor_test%ROWCOUNT); FETCH cursor_test INTO v_name,v_age; END LOOP; --%notfound LOOP DBMS_OUTPUT.PUT_LINE('開始'); EXIT WHEN cursor_test%NOTFOUND; END LOOP; --關閉遊標 CLOSE cursor_test; END;