在字段中使用双引号和逗号加载数据本地文件

Question

我正在尝试将数据导入到表中。目前我正在努力

LOAD DATA local INFILE "C:/PRINT DAILY DOC_CommaDelimited.txt"
into table daily_doc_report_full
fields terminated by ','
OPTIONALLY ENCLOSED BY '"'
LINES TERMINATED BY '\r\n'
IGNORE 5 LINES;

导入数据是这样的

"   1","SALES DEPT SALES             ","    0"," -285,723","  

导入时，第四个字段中的逗号会扰乱数据的导入方式。

数据应该是这样的

| Line| Description      | today | Month_to_date|
|    1| Sales Dept Sales |   0.00|   -285,723.00|

数据被截断并显示

| Line| Description      | today | Month_to_date|
|    1| Sales Dept Sales |   0.00|       -285.00|

我尝试了对加载数据本地文件查询进行各种更改，例如从

OPTIONALLY

中删除

ENCLOSED BY '"'

，但我就是无法让它按预期工作。我使用的是 MYSQL 8.0

Answer 1

MySQL 不理解以逗号作为千位分隔符格式的数字。如果您尝试将包含逗号的字符串转换为数字，它会忽略从逗号到结尾的任何字符。

这与 LOAD DATA INFILE 或括起来的引号无关。我们可以用一个简单的 CAST() 表达式来演示同样的问题：

mysql> select cast('-285,723' as decimal);
+-----------------------------+
| cast('-285,723' as decimal) |
+-----------------------------+
|                        -285 |
+-----------------------------+
1 row in set, 1 warning (0.00 sec)

mysql> select cast('-285723' as decimal);
+----------------------------+
| cast('-285723' as decimal) |
+----------------------------+
|                    -285723 |
+----------------------------+

您可以使用 LOAD DATA INFILE 解决此问题，方法是首先将字符串复制到用户变量，然后从用户变量中删除逗号。

我用 MySQL 8.3 对此进行了测试：

mysql> LOAD DATA local INFILE 'c.csv' into table mytable 
  fields terminated by ',' 
  OPTIONALLY ENCLOSED BY '"' 
  (line, description, @today, @month_to_date) 
  set today = replace(@today, ',', ''), 
      month_to_date = replace(@month_to_date, ',', '');
Query OK, 1 row affected, 1 warning (0.00 sec)

mysql> select * from mytable;
+------+-------------------------------+-------+---------------+
| line | description                   | today | month_to_date |
+------+-------------------------------+-------+---------------+
|    1 | SALES DEPT SALES              |  0.00 |    -285723.00 |
+------+-------------------------------+-------+---------------+