如何将包含一些空单元格的 CSV 文件加载到 MySQL？

Question

我正在尝试将包含一些空单元格的 CSV 文件导入 MySQL 数据库。你能帮我吗？

我的上一个线程已关闭，因为它“与 similar question 相关联”。我尝试了该解决方案但没有奏效，下面列出了对此的尝试。

我创建了一个table：

CREATE TABLE citytable (
    id int(11) NOT NULL auto_increment,
    city varchar(100),
    number int(11) NOT NULL DEFAULT 1,
    comment varchar(100),
    primary key(id)
    );

我已经用数据填充了一个 csv，并想将其导入 table

CSV 文件csvfile.csv:

id,city,number,comment
1,NY,1,Something
2,W,2,
3,C,1,Something
4,LA,1,

所以我使用以下命令加载 CSV：

LOAD DATA INFILE 'C:/ProgramData/MySQL/MySQL Server 8.0/Uploads/csvfile.csv' 
INTO TABLE citytable
FIELDS TERMINATED BY ',' 
ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 LINES
(id,city,number,@vcomment)
SET comment = NULLIF(@vcomment,'');

我也试过将 comment 的默认值设置为 '' 并重新运行命令并得到错误 ``ERROR 1261 (01000): 第 4 行不包含所有列的数据`.

LOAD DATA INFILE 'C:/ProgramData/MySQL/MySQL Server 8.0/Uploads/csvfile.csv' 
INTO TABLE citytable
FIELDS TERMINATED BY ',' 
ENCLOSED BY '"'
LINES TERMINATED BY '\n'
IGNORE 1 LINES
(id,city,number,comment);

如果该单元格中没有数据，我如何只导入数据库并让值为“NULL”？

Answer 1

将 LOAD FILE 更改为：

LOAD DATA INFILE 'D:/TEMP/csvfile.csv' 
INTO TABLE citytable
FIELDS TERMINATED BY ',' 
ENCLOSED BY '"'
LINES TERMINATED BY '\r\n'
IGNORE 1 LINES
(id,city,number,@vcomment)
SET comment = NULLIF(@vcomment,'');

我确实得到了以下结果：

MySQL [test]> LOAD DATA INFILE 'D:/TEMP/csvfile.csv'
    -> INTO TABLE citytable
    -> FIELDS TERMINATED BY ','
    -> ENCLOSED BY '"'
    -> LINES TERMINATED BY '\r\n'
    -> IGNORE 1 LINES
    -> (id,city,number,@vcomment)
    -> SET comment = NULLIF(@vcomment,'');
Query OK, 4 rows affected (0.00 sec)
Records: 4  Deleted: 0  Skipped: 0  Warnings: 0

MySQL [test]> select * from citytable;
+----+------+--------+-----------+
| id | city | number | comment   |
+----+------+--------+-----------+
|  1 | NY   |      1 | Something |
|  2 | W    |      2 | NULL      |
|  3 | C    |      1 | Something |
|  4 | LA   |      1 | NULL      |
+----+------+--------+-----------+
4 rows in set (0.00 sec)

MySQL [test]>

如何将包含一些空单元格的 CSV 文件加载到 MySQL？

How can a CSV file with some empty cells be loaded into MySQL?

mysql

csv

mysql-loadfile