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DECLARE
       v_cursor NUMBER;
       v_stat NUMBER;
       v_row NUMBER;
       v_id NUMBER;
       v_no VARCHAR(100);
       v_date DATE;
       v_sql VARCHAR(200);
       s_id NUMBER;
       s_date DATE;
BEGIN
     s_id := 3000;
     s_date := SYSDATE;
     v_sql := 'SELECT id,qan_no,sample_date from "tblno" WHERE id > :sid and sample_date < :sdate';
     v_cursor := dbms_sql.open_cursor; --´ò¿ªÓαꣻ
     dbms_sql.parse(v_cursor, v_sql, dbms_sql.native); --½âÎö¶¯Ì¬SQLÓï¾ä£»
     dbms_sql.bind_variable(v_cursor, ':sid', s_id); --°ó¶¨ÊäÈë²ÎÊý£»
     dbms_sql.bind_variable(v_cursor, ':sdate', s_date);
    
     dbms_sql.define_column(v_cursor, 1, v_id); --¶¨ÒåÁÐ
     dbms_sql.define_column(v_cursor, 2, v_no, 100);
     dbms_sql.define_column(v_cursor, 3, v_date);
     v_stat := dbms_sql.execute(v_cursor); --Ö´Ðж¯Ì¬SQLÓï¾ä¡£
     LOOP
         EXIT WHEN dbms_sql.fetch_rows(v_cursor)<=0; --fetch_rowsÔÚ½á¹û¼¯ÖÐÒÆ¶¯Óα꣬Èç¹ûδµÖ´ïĩ⣬·µ»Ø1¡£        
         dbms_sql.column_value(v_cursor, 1, v_id); --½«µ±Ç°ÐеIJéѯ½á¹ûдÈëÉÏÃæ¶¨ÒåµÄÁÐÖС£
         dbms_sq


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