遍历一个表而不知道它在oracle中的列名

如何解决遍历一个表而不知道它在oracle中的列名

我要处理的是动态创建的表，即它每次创建时具有不同的字段数和不同的字段名。在不知道其字段名称的情况下该如何处理？ 例如

  for FieldValue in (select * from PAYROLL_POVIT)
  loop
      csvLine := null;
      for FieldName in (select COLUMN_NAME from ALL_TAB_COLUMNS where TABLE_NAME='PAYROLL_POVIT')
      loop
          csvLine := csvLine || FieldValue.FieldName.COLUMN_NAME
      end loop;  
      DBMS_OUTPUT.PUT_LINE(csvLine);
  end loop;

或类似的

for FieldValue in (select * from PAYROLL_POVIT)
  loop
      csvLine := null;
      for i in 1..(select count (*) from ALL_TAB_COLUMNS where TABLE_NAME='PAYROLL_POVIT')
      loop
          csvLine := csvLine || FieldValue.COLUMN(i)
      end loop;  
      DBMS_OUTPUT.PUT_LINE(csvLine);
  end loop;

谢谢

解决方法

我设法了。这是解决方案

create or replace PROCEDURE PAYROLL_CSV
IS 
  csvLine clob;
  MySQL VARCHAR2(100);
  MySQLResult VARCHAR2(500);
  fileHandler UTL_FILE.FILE_TYPE;
BEGIN
  fileHandler := UTL_FILE.FOPEN('ORACLE_DIRECTORY','myfile.csv','w');
  csvLine := null;
  for FieldName in (select COLUMN_NAME from ALL_TAB_COLUMNS where TABLE_NAME='PAYROLL_POVIT')
  loop
      csvLine := csvLine || FieldName.COLUMN_NAME || ',';      
  end loop;
  UTL_FILE.put_line(fileHandler,csvLine); -- File Header
  
  for FieldValue in (select * from PAYROLL_POVIT)
  loop
      csvLine := null;
      for FieldName in (select COLUMN_NAME from ALL_TAB_COLUMNS where TABLE_NAME='PAYROLL_POVIT')
      loop
          MySQL := 'select "' || FieldName.COLUMN_NAME || '" from PAYROLL_POVIT where PAYROLL_RECID = ' || FieldValue.PAYROLL_RECID;
          EXECUTE IMMEDIATE MySQL INTO MySQLResult;
          csvLine := csvLine || MySQLResult || ',';
      end loop;  
      UTL_FILE.put_line(fileHandler,csvLine); -- Row Data
  end loop;
  UTL_FILE.FCLOSE(fileHandler);
  
EXCEPTION
  WHEN utl_file.invalid_path THEN
     raise_application_error(-20000,'ERROR: Invalid path for file or path not in INIT.ORA.');
END;