使用LOAD DATA时如何在MySQL中加载日期数据

Question

日期列的默认日期格式YYYY-MM-DD HH:MM:SS在MySQL中.

我尝试加载的数据文件有一个日期字段,其DD-MON-YY HH:MM:SS格式为日期.当我使用LOAD DATA命令加载此文件时,数据库会混淆,只是使所有日期条目为0000-00-00 00:00:00或NULL

这是我使用STR_TO_DATE选项进行的测试,它不起作用.

测试infile(test_temp.csv)

c1, c2
07-JUN-12 22:50:19, "abc"
07-JUN-13 22:50:19, "bcd"

测试表(temp_test)

describe temp_test;
+-------+-------------+------+-----+---------+-------+
| Field | Type        | Null | Key | Default | Extra |
+-------+-------------+------+-----+---------+-------+
| c1    | datetime    | YES  |     | NULL    |       |
| c2    | varchar(10) | YES  |     | NULL    |       |
+-------+-------------+------+-----+---------+-------+

数据加载命令:

load data
infile '/var/lib/mysql/DataSet-1/temp_test.csv'
ignore
into table temp_test
fields terminated by ','
enclosed by '"'
lines terminated by '\r\n'
ignore 1 lines
(@var_c1,c2)
set c1 = STR_TO_DATE(@var_c1,'%d-%b-%y %h:%i:%s');

产量

Query OK, 2 rows affected, 2 warnings (0.00 sec)
Records: 2  Deleted: 0  Skipped: 0  Warnings: 0

MySQL> show warnings;
+-------+------+-------------------------------------------------------------------------+
| Level | Code | Message                                                                 |
+-------+------+-------------------------------------------------------------------------+
| Error | 1411 | Incorrect datetime value: '07-JUN-12 22:50:19' for function str_to_date |
| Error | 1411 | Incorrect datetime value: '07-JUN-13 22:50:19' for function str_to_date |
+-------+------+-------------------------------------------------------------------------+

MySQL> select * from temp_test;
+------+------+
| c1   | c2   |
+------+------+
| NULL | abc  |
| NULL | bcd  |
+------+------+

是问题所在

1. 输入日期列(应该是07-JUN-12或07-Jun-12)或
2. 用我的格式字符串(%d-%b-%y)或
3. 别的什么？

Answer 1

您的格式字符串STR_TO_DATE()无效.样本数据中的小时数为24小时格式(%H或%k)而不是12小时(%h).您可以在此处查看所有可能的日期格式说明符.

更改

%d-%b-%y %h:%i:%s

至

%d-%b-%y %H:%i:%s
         ^^

您的陈述可能如下所示

LOAD DATA INFILE '/path/to/temp_test.csv'
IGNORE INTO TABLE temp_test
  FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
  LINES TERMINATED BY '\r\n' -- or '\n'
  IGNORE 1 LINES
(@c1, c2)
SET c1 = STR_TO_DATE(@c1,'%d-%b-%y %H:%i:%s');

加载样本数据后

mysql> select * from temp_test;
+---------------------+------+
| c1                  | c2   |
+---------------------+------+
| 2012-06-07 22:50:19 | abc  |
| 2013-06-07 22:50:19 | bcd  |
+---------------------+------+
2 rows in set (0.00 sec)

Answer 2

由于我遇到了类似的问题，但是传入日期格式不同，因此，如果传入日期格式为以下格式，则应执行以下操作：

输入日期格式样本，

Tuesday, May 24, 2016
Wednesday, May 25, 2016

您将需要使用其他日期格式，

%W, %b %d, %Y

这是mysql文档的链接和日期格式列表，但简要来说，

日期部分，

%Y Year, numeric, four digits
%y Year, numeric (two digits)
%c Month, numeric (0..12)
%m Month, numeric (00..12)
%M Month name (January..December)
%b Abbreviated month name (Jan..Dec)
%d Day of the month, numeric (00..31)
%e Day of the month, numeric (0..31)
%D Day of the month with English suffix (0th, 1st, 2nd, 3rd, ?-)

平日

%W Weekday name (Sunday..Saturday)
%a Abbreviated weekday name (Sun..Sat)
%w Day of the week (0=Sunday..6=Saturday)
%j Day of year (001..366)

时间

%T  Time, 24-hour (hh:mm:ss)
%r  Time, 12-hour (hh:mm:ss followed by AM or PM)
%H  Hour (00..23)
%h  Hour (01..12)
%I  Hour (01..12)
%k  Hour (0..23)
%l  Hour (1..12)
%i  Minutes, numeric (00..59)
%S  Seconds (00..59)
%s  Seconds (00..59)
%f  Microseconds (000000..999999)
%p  AM or PM

还有其他未在上面列出的模式。

LOAD DATA INFILE '/path/to/temp_test.csv'
IGNORE INTO TABLE temp_test
  FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"'
  LINES TERMINATED BY '\r\n' #use '\n' for linux
  IGNORE 1 LINES
(@var_col1, col2)
SET col1 = STR_TO_DATE(@var_col1,'%d-%b-%y %H:%i:%s');