Oracle外部表小例

1)建立操作系统目录e:/test，准备数据文件dept.txt并置于e:/test之下

"10","ACCOUNTING","NEW YORK"
"20","RESEARCH","DALLAS"
"30","SALES","CHICAGO"
"40","OPERATIONS","BOSTON"

2)创建数据库目录对象e_test

CREATE directory e_test AS 'e:/test';

 

3)定义外部表

CREATE TABLE new_dept(deptno NUMBER(2)
                     ,dname VARCHAR2(14)
                     ,loc VARCHAR2(13))
organization EXTERNAL(TYPE oracle_loader
                      DEFAULT directory e_test
                      access PARAMETERS(records delimited BY newline
                                        badfile 'dept.bad'
                                        discardfile 'dept.dsc'
                                        logfile 'dept.log'
                                        fields terminated BY ','
                                        optionally enclosed BY '"'
                                        missing field VALUES are NULL)
                       location('dept.txt'));

 

4)验证（支持查询，但不支持DML进行写操作）

SELECT * FROM new_dept;