将table内容输出为csv文件

1、创建 directory

create or replace directory tt as'c:\';

SELECT * FROM DBA_OBJECTS DO WHERE DO.OBJECT_TYPE LIKE'%DIR%'; --- 查询目录是否创建成功

2、输出脚本：来自asktom网站

create or replace procedure dump_table_to_csv(p_tname    in varchar2,
                                              p_dir      in varchar2,
                                              p_filename in varchar2) authid current_user /* <<<== if you want... runs as "invoker" and runs with ROLES */
 is
  l_output      utl_file.file_type;
  l_theCursor   integer default dbms_sql.open_cursor;
  l_columnValue varchar2();
  l_status      integer;
  l_query       varchar2() default 'select * from ' || p_tname;
  l_colCnt      number := ;
  l_separator   varchar2();
  l_descTbl     dbms_sql.desc_tab;
begin
  l_output := utl_file.fopen(p_dir, p_filename, 'w');
  execute immediate 'alter session set nls_date_format=''dd-mon-yyyy hh24:mi:ss'' ';

  dbms_sql.parse(l_theCursor, l_query, dbms_sql.native);
  dbms_sql.describe_columns(l_theCursor, l_colCnt, l_descTbl);

  for i in  .. l_colCnt loop
    utl_file.put(l_output,
                 l_separator || '"' || l_descTbl(i).col_name || '"');
    dbms_sql.define_column(l_theCursor, i, l_columnValue, );
    l_separator := ',';
  end loop;
  utl_file.new_line(l_output);

  l_status := dbms_sql.execute(l_theCursor);

  while (dbms_sql.fetch_rows(l_theCursor) > ) loop
    l_separator := '';
    for i in  .. l_colCnt loop
      dbms_sql.column_value(l_theCursor, i, l_columnValue);
      utl_file.put(l_output, l_separator || l_columnValue);
      l_separator := ',';
    end loop;
    utl_file.new_line(l_output);
  end loop;
  dbms_sql.close_cursor(l_theCursor);
  utl_file.fclose(l_output);

  execute immediate 'alter session set nls_date_format=''dd-MON-yy'' ';
exception
  when others then
    execute immediate 'alter session set nls_date_format=''dd-MON-yy'' ';
    raise;
end;

3、执行

SQL> exec dump_table_to_csv(p_tname =>'test',p_dir =>'TT',p_filename => 'tt.csv' );

PL/SQL procedure successfully completed

由于utl_file.fopen(p_dir, p_filename, 'w') 存储过程要求p_dir必须为大写字符，所以这里要注意，如果不是全大写，会出现ORA-29280: invalid directory path 错误