Mysql

Question

已编辑：我可以用这种格式只用一行存储一个文件的记录。

0,2016-03-31-13:48:16.435,0.705486,1,F2221-222

但是当我尝试存储包含 2 行或更多行的文件时出现错误。

0,2016-03-31-13:48:16.435,0.705486,1,F2221-222
1,2016-03-31-13:48:16.435,0.56606096,2,F2221-222

我正在使用：

load data infile 'flight3021' 
into table signal_times
fields terminated BY ','
(signaltime_id,@var1,value,signal_id,flight_number)
SET time = STR_TO_DATE(@var1,'%Y-%m-%d-%H:%i:%S.%f')

错误：

Cannot add or update a child row: a foreign key constraint fails (`cmsdbdev`.`signal_times`, CONSTRAINT `FK_r2e4qo5suuwrlkr08ryebv14i` FOREIGN KEY (`flight_number`) REFERENCES `flight_data` (`flight_number`))

奇怪的是，如果我正常插入这两行它就可以工作，所以它与 FK 约束违规错误有关。我认为这一定是加载数据 infile 的问题。

谢谢。

Answer 1

'2016-03-31-13:16:24.861' 加载为“'2016-03-31-13:16:24.861'”，这就是为什么它不是有效的 datetime.

我使用 TRIM 函数来尝试解决这个问题。

对于多行，需要lines terminated by。

load data infile '/home/jinggang.sjg/data1' 
into table signal_times
fields terminated BY ',' ESCAPED BY ""
lines terminated by '\r\n'
(signaltime_id,@var1,value,signal_id,flight_number)
SET time = STR_TO_DATE(@var1,'%Y-%m-%d-%H:%i:%S.%f');

Answer 2

尝试：

文件：'/path/to/file/flight3021'

0,2016-03-31-13:48:16.435,0.705486,1,F2221-222
1,2016-03-31-13:48:16.435,0.56606096,2,F2221-222

MySQL 命令行：

mysql> SELECT VERSION();
+-----------+
| VERSION() |
+-----------+
| 5.7.11    |
+-----------+
1 row in set (0.00 sec)

mysql> DROP TABLE IF EXISTS `signal_times`;
Query OK, 0 rows affected (0.00 sec)

mysql> CREATE TABLE IF NOT EXISTS `signal_times` (
    ->   `signaltime_id` INT UNSIGNED,
    ->   `time` TIMESTAMP(3),
    ->   `value` DECIMAL(10,8),
    ->   `signal_id` INT UNSIGNED,
    ->   `flight_number` VARCHAR(10)
    -> );
Query OK, 0 rows affected (0.00 sec)

mysql> LOAD DATA INFILE '/path/to/file/flight3021'
    ->   INTO TABLE `signal_times`
    ->   FIELDS TERMINATED BY ','
    ->   LINES TERMINATED BY '\r\n'
    ->   (`signaltime_id`,
    ->    @`var1`,
    ->    `value`,
    ->    `signal_id`,
    ->    `flight_number`
    ->   )
    ->   SET `time` = STR_TO_DATE(@`var1`,'%Y-%m-%d-%H:%i:%S.%f');
Query OK, 2 rows affected (0.00 sec)
Records: 2  Deleted: 0  Skipped: 0  Warnings: 0

mysql> SELECT
    ->   `signaltime_id`,
    ->   `time`,
    ->   `value`,
    ->   `signal_id`,
    ->   `flight_number`
    -> FROM
    ->   `signal_times`;
+---------------+-------------------------+------------+-----------+---------------+
| signaltime_id | time                    | value      | signal_id | flight_number |
+---------------+-------------------------+------------+-----------+---------------+
|             0 | 2016-03-31 13:48:16.435 | 0.70548600 |         1 | F2221-222     |
|             1 | 2016-03-31 13:48:16.435 | 0.56606096 |         2 | F2221-222     |
+---------------+-------------------------+------------+-----------+---------------+
2 rows in set (0.00 sec)

Mysql - 加载格式化日期的数据文件

Mysql - Load Data Infile formatting a date

load-data-infile