麻烦高手们看看这段代码有没有语法错误！

麻烦高手们看看这段代码有没有语法错误！
大家看看我的这个存储过程。表HAOBAI是个空表，为什么执行这个存储过程后，表HAOBAI里只插入了一条数据呢？
大家看看语法对不对，有没有死循环或者别的语法错误？

CREATE OR REPLACE PROCEDURE STORE_WIKI AS 

DECLARE 

question varchar(100); 

answer varchar(1000); 

url varchar(1000); 

question_sum number; 

cursor cur is SELECT WIKI_EXPLANATION.TITLE,WIKI_EXPLANATION.EXPLANATION,WIKI_EXPLANATION.URL 

              FROM WIKI_EXPLANATION 

              WHERE WIKI_EXPLANATION.URL NOT IN (SELECT URL FROM HAOBAI); 

begin 

    open cur; 

    fetch cur into question,answer,url; 

    while cur %found loop 

        select count(*) into question_sum from HAOBAI where HAOBAI.QUESTION = question; 

        if question_sum = 0 

        then 

            INSERT 

            INTO HAOBAI 

            VALUES(question,answer,url); 

        end if; 

        commit; 

        fetch cur into question,answer,url; 

    end loop; 

    close cur; 

end; 

下面这句sql语句读出来的数据有很多条，绝对不止一条。
SELECT WIKI_EXPLANATION.TITLE,WIKI_EXPLANATION.EXPLANATION,WIKI_EXPLANATION.URL
FROM WIKI_EXPLANATION
WHERE WIKI_EXPLANATION.URL NOT IN (SELECT URL FROM HAOBAI);