oracle - pl/sql 从数字到字符串的转换

Question

我需要在不使用内置函数的情况下将 pl/sql 中的数字转换为字符串，我们应该为此使用字符串/模块操作。例如，如果输入是 123，那么输出应该是 123，任何人都可以给我关于这个的建议吗？

Answer 1

You could do this in SQL or PL/SQL using the following:

In SQL:

SELECT to_char(to_date(<number_column>,'j'), 'jsp') 
  FROM <table>;

In PL/SQL:

DECLARE
  v_number NUMBER := 56;
  v_text   VARCHAR2(128);
BEGIN
  v_text := to_char(to_date(v_number,'j'), 'jsp');
END;

More information from AskTom here: http://asktom.oracle.com/pls/apex/f?p=100:11:0::NO::P11_QUESTION_ID:18305103094123#PAGETOP

I suppose it really depends upon what level of "in-built" functions you are going to artificially prevent yourself using and why?

Hope it helps.