在 LOAD DATA LOCAL INFILE 期间将 'False'(string) 转换为 False(boolean)

Question

在 MySQL 中，无论如何都可以将“False”加载到布尔列中。

在具有布尔列且数据为“真”或“假”的表中加载数据时，它会发出以下警告：

"Incorrect integer value: 'False' for column 'c1' at row 1".

表结构如下

Create Table: CREATE TABLE `n1` (
  `c1` boolean ,
  `c2` int
) ENGINE=InnoDB DEFAULT CHARSET=latin1

我正在使用加载数据语句从文件“file1”加载，该文件以逗号分隔并用双引号括起来。以下是数据样本

"False","1" 
"True","2"

加载数据本地infile语句如下

load data local infile 'file1' 
into table n1 
  FIELDS TERMINATED BY ',' 
  enclosed by '\"' LINES 
  TERMINATED BY '\r\n';

Answer 1

使用用户变量转换第一个值以加载 True/False 值。

然后，将其与值 'True' 进行比较

建议的解决方案

LOAD DATA LOCAL INFILE 'C:/bin/input.txt' INTO TABLE n1
FIELDS TERMINATED BY ',' ENCLOSED BY '\"'
LINES TERMINATED BY '\r\n' (@var1,c2)
SET c1 = (@var1 = 'True');

样本数据

C:\bin>dir
 Volume in drive C is TI10665200H
 Volume Serial Number is A273-2EFF

 Directory of C:\bin

10/21/2014  10:01 AM    <DIR>          .
10/21/2014  10:01 AM    <DIR>          ..
10/21/2014  10:01 AM                23 input.txt
               1 File(s)             23 bytes
               2 Dir(s)  685,548,244,992 bytes free

C:\bin>type input.txt
"False","1"
"True","2"
C:\bin>

建议解决方案代码

USE test
DROP TABLE IF EXISTS n1;
CREATE TABLE `n1` (
  `c1` boolean ,
  `c2` int
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
LOAD DATA LOCAL INFILE 'C:/bin/input.txt' INTO TABLE n1
FIELDS TERMINATED BY ',' ENCLOSED BY '\"'
LINES TERMINATED BY '\r\n' (@var1,c2)
SET c1 = (@var1 = 'True');
SELECT * FROM n1;

已执行的拟议解决方案代码

mysql> USE test
Database changed
mysql> DROP TABLE IF EXISTS n1;
Query OK, 0 rows affected (0.14 sec)

mysql> CREATE TABLE `n1` (
    ->   `c1` boolean ,
    ->   `c2` int
    -> ) ENGINE=InnoDB DEFAULT CHARSET=latin1;
Query OK, 0 rows affected (0.38 sec)

mysql> LOAD DATA LOCAL INFILE 'C:/bin/input.txt' INTO TABLE n1
    -> FIELDS TERMINATED BY ',' ENCLOSED BY '\"'
    -> LINES TERMINATED BY '\r\n' (@var1,c2)
    -> SET c1 = (@var1 = 'True');
Query OK, 2 rows affected (0.03 sec)
Records: 2  Deleted: 0  Skipped: 0  Warnings: 0

mysql> SELECT * FROM n1;
+------+------+
| c1   | c2   |
+------+------+
|    0 |    1 |
|    1 |    2 |
+------+------+
2 rows in set (0.00 sec)

mysql>

试一试 ！！！