mysql - LOAD DATA LOCAL INFILE 插入空白记录

Question

尝试使用以下命令导入文本文件

LOAD DATA LOCAL INFILE '/var/www/colleges.txt' 
INTO TABLE selections LINES TERMINATED BY '\n' 
SET unit=null, created=NOW(), type="college";

表结构

id   INT Autoincremented
name Varchar
type Varchar
unit Varchar
crated datetime

但上面的命令为 name 字段添加了空白值。

这是我的示例文本文件:

American River College
American University
Amherst College

( http://india-webdev.com/demo/colleges.txt )

Answer 1

您必须在 SET 子句之前指定直接从 () 包围的文本文件映射的列列表:

LOAD DATA LOCAL INFILE '/var/www/colleges.txt' 
INTO TABLE selections 
LINES TERMINATED BY '\n' 
-- Here, list columns from the file in ()
(name)
-- Followed by columns for which you set values
SET
  unit=null,
  created=NOW(),
  type="college";

根据您的输入数据，这已经过测试并且可以在我的开发数据库中使用。

MariaDB [test]> select * from selections;
+----+------------------------+---------+------+---------------------+
| id | name                   | type    | unit | created             |
+----+------------------------+---------+------+---------------------+
|  1 | American River College | college | NULL | 2015-02-16 08:08:01 |
|  2 | American University    | college | NULL | 2015-02-16 08:08:01 |
|  3 | Amherst College        | college | NULL | 2015-02-16 08:08:01 |
+----+------------------------+---------+------+---------------------+

在文档中有点模棱两可:

...snip...
[LINES
        [STARTING BY 'string']
        [TERMINATED BY 'string']
    ]
    [IGNORE number LINES]
    -- HERE....
    [(col_name_or_user_var,...)]
    [SET col_name = expr,...]

http://dev.mysql.com/doc/refman/5.1/en/load-data.html