关于动态SQL问题

[simple1986_2008]

现在开发人员有一个需求，想要在前台程序调用一去SP，
SP的参数有 参数有文件名称，路径，表格
功能 把表格中的内容写入指定的路径下的文件中

提醒：
每次调用时，表格的名称可能会不一样，

个人觉得要用到动态SQL及动态游标的知识
但因能力有限，请高手作答。

[gelyon]

没说清楚，比较空洞....

[碧水幽幽泉]

LZ需求很模糊！

[duanzhi1984]

没明白楼主的意思。。。。

[ngx20080110]

簡單寫了一個，希望對樓主有所啟發

create or replace procedure print_table(table_name in varchar2)
is
  cursor cur_columns(tn varchar2) is
  select column_name,data_type from user_tab_columns
  where upper(table_name) = upper(tn)
  order by column_id;
  
  statement varchar2(2000);
  print_line varchar2(2000);
begin
  statement := 'declare ' || chr(10);
  statement := statement || '  cursor cur_main is ' || chr(10);
  statement := statement || '  select ' || chr(10);
  
  print_line := '  dbms_output.put_line(';
  for col in cur_columns(table_name) loop
    if col.data_type = 'DATE' then
      statement := statement || 'to_char(' || col.column_name || ', ''yyyymmdd hh24:mi:ss'') AS ' || col.column_name;
    else
      statement := statement || col.column_name;
    end if;
    statement := statement || ',';
    
    print_line := print_line || 'r.' || col.column_name || ' || '','' || ';
  end loop;
  statement := substr(statement, 1, length(statement) - 1) || chr(10);
  statement := statement || ' from ' || table_name || ';' || chr(10);
  
  print_line := substr(print_line, 1, length(print_line) - 11);
  print_line := print_line || ');' || chr(10);
  
  statement := statement || 'begin ' || chr(10);
  statement := statement || 'for r in cur_main loop ' || chr(10);
  statement := statement || print_line;
  statement := statement || 'end loop;' || chr(10);
  statement := statement || 'end;';
  
  dbms_output.put_line(statement);
  
  execute immediate statement;
end;

-- 測試代碼
begin
  print_table('employees');
end;

-- 輸出結果
198,Donald,OConnell,DOCONNEL,650.507.9833,19990621 00:00:00,SH_CLERK,2600,,124,50
199,Douglas,Grant,DGRANT,650.507.9844,20000113 00:00:00,SH_CLERK,2600,,124,50
...
...

[minitoy]

需求太模糊.不过应该会用到cursor和utl_file包.