Question

我有这段代码：

def_where:=def_where||'  TO_CHAR(date_of_input,''MM'') like '''||'to_char(date_of_input,''MM'')=nvl(:DSP_month,to_char(date_of_input,''MM''))'||'%'  ||'to_char(date_of_input,''RRRR'')=nvl(:DSP_year,to_char(date_of_input,''RRRR''))'||'%''';

我得到错误sql命令未正确结束。

Answer 1

def_where建议，这是where子句的动态构建查询的一部分。但是生成的字符串毫无意义，它应该是这样的：

declare 
    def_where varchar2(32767) := '';
begin
    def_where  :=  def_where 
        || ' to_char(date_of_input, ''MM'') '
        || ' = nvl(:DSP_month, to_char(date_of_input, ''MM'')) and' 
        || ' to_char(date_of_input, ''RRRR'') '
        || ' = nvl(:DSP_year, to_char(date_of_input, ''RRRR''))';

  dbms_output.put_line(def_where);

end;

查看从dbms_output获得的内容，如果需要，请更正此语法。你也可以重写你的字符串来获得这个：

(extract(month from date_of_input) = :DSP_month or :DSP_month is null) and 
(extract(year  from date_of_input) = :DSP_year  or :DSP_year  is null)

没有正确关闭sql命令

1 个答案: