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mysql导入数据报Unknown command ‘\f‘.异常处理方法

2021-10-01 21:02:51 作者：互联网

mysql> select * from fruits; 【查看fruits表中的数据】

+------+------+------------+---------+

| f_id | s_id | f_name | f_price |

+------+------+------------+---------+

| a1 | 101 | apple | 5.20 |

| b1 | 101 | blackberry | 10.20 |

| bs1 | 102 | orange | 11.20 |

| bs2 | 105 | melon | 8.20 |

| c0 | 101 | cherry | 3.20 |

| o2 | 103 | coconut | 9.20 |

| t1 | 102 | banana | 10.30 |

| t2 | 102 | grape | 5.30 |

+------+------+------------+---------+

8 rows in set (0.00 sec)

mysql>

步骤1：执行备份操作

C:\Users\Administrator>mysqldump -uroot -p test_db fruits > c:\fruits.sql 【执行备份操作】

Enter password: *********

C:\Users\Administrator>

备份完成之后可以查看备份的文件内容信息如下所示

-- MySQL dump 10.13 Distrib 8.0.25, for Win64 (x86_64)

-- Host: localhost Database: test_db

-- ------------------------------------------------------

-- Server version 8.0.25

/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;

/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;

/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;

/*!50503 SET NAMES utf8mb4 */;

/*!40103 SET @OLD_TIME_ZONE=@@TIME_ZONE */;

/*!40103 SET TIME_ZONE='+00:00' */;

/*!40014 SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0 */;

/*!40014 SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0 */;

/*!40101 SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='NO_AUTO_VALUE_ON_ZERO' */;

/*!40111 SET @OLD_SQL_NOTES=@@SQL_NOTES, SQL_NOTES=0 */;

-- Table structure for table `fruits`

DROP TABLE IF EXISTS `fruits`;

/*!40101 SET @saved_cs_client = @@character_set_client */;

/*!50503 SET character_set_client = utf8mb4 */;

CREATE TABLE `fruits` (

`f_id` char(10) NOT NULL,

`s_id` int NOT NULL,

`f_name` char(255) NOT NULL,

`f_price` decimal(8,2) NOT NULL,

PRIMARY KEY (`f_id`)

) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

/*!40101 SET character_set_client = @saved_cs_client */;

-- Dumping data for table `fruits`

LOCK TABLES `fruits` WRITE;

/*!40000 ALTER TABLE `fruits` DISABLE KEYS */;

INSERT INTO `fruits` VALUES ('a1',101,'apple',5.20),('b1',101,'blackberry',10.20),('bs1',102,'orange',11.20),('bs2',105,'melon',8.20),('c0',101,'cherry',3.20),('o2',103,'coconut',9.20),('t1',102,'banana',10.30),('t2',102,'grape',5.30);

/*!40000 ALTER TABLE `fruits` ENABLE KEYS */;

UNLOCK TABLES;

/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;

/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;

/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;

/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;

/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2021-10-01 14:57:15

步骤2：执行数据恢复操作

mysql> delete from fruits; 【清空源表数据】

Query OK, 8 rows affected (0.00 sec)

mysql>

接着执行恢复操作

mysql> source c:\fruits.sql;

ERROR:

Unknown command '\f'.

Query OK, 0 rows affected (0.00 sec)

Query OK, 8 rows affected (0.00 sec)

Records: 8 Duplicates: 0 Warnings: 0

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected, 1 warning (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql>
验证数据是否正常恢复回来

mysql> select * from fruits;

+------+------+------------+---------+

| f_id | s_id | f_name | f_price |

+------+------+------------+---------+

| a1 | 101 | apple | 5.20 |

| b1 | 101 | blackberry | 10.20 |

| bs1 | 102 | orange | 11.20 |

| bs2 | 105 | melon | 8.20 |

| c0 | 101 | cherry | 3.20 |

| o2 | 103 | coconut | 9.20 |

| t1 | 102 | banana | 10.30 |

| t2 | 102 | grape | 5.30 |

+------+------+------------+---------+

8 rows in set (0.00 sec)

mysql>

但是在恢复过程中发现有出现了个警告信息

警告查阅相关资料反馈mysql默认是以gbk编码连接数据库的，之前导出备份的文件是UTF8，

编码不一致导致报的警告异常信息，处理方法为连接mysql时指定字符集为utf8即可

mysql> select @@character_set_connection; 【查看客户端连接mysql使用的字符集】

+----------------------------+

| @@character_set_connection |

+----------------------------+

| gbk |

+----------------------------+

1 row in set (0.00 sec)

mysql> select @@character_set_client;

+------------------------+

| @@character_set_client |

+------------------------+

| gbk |

+------------------------+

1 row in set (0.00 sec)

mysql> select @@character_set_results;

+-------------------------+

| @@character_set_results |

+-------------------------+

| gbk |

+-------------------------+

1 row in set (0.00 sec)

mysql>

C:\Users\Administrator>mysql -uroot -p --default-character-set=utf8 【连接mysql指定连接使用的字符集】

Enter password: *********

Welcome to the MySQL monitor. Commands end with ; or \g.

Your MySQL connection id is 58

Server version: 8.0.25 MySQL Community Server - GPL

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> select @@character_set_connection; 【查看连接使用的字符集】

+----------------------------+

| @@character_set_connection |

+----------------------------+

| utf8mb3 |

+----------------------------+

1 row in set (0.00 sec)

mysql>

mysql> select @@character_set_client;

+------------------------+

| @@character_set_client |

+------------------------+

| utf8mb3 |

+------------------------+

1 row in set (0.00 sec)

mysql>

mysql> select @@character_set_results;

+-------------------------+

| @@character_set_results |

+-------------------------+

| utf8mb3 |

+-------------------------+

1 row in set (0.00 sec)

mysql>

mysql> use test_db;

Database changed

mysql> delete from fruits; 【清空表中数据】

Query OK, 0 rows affected (0.00 sec)

mysql> select * from fruits; 【验证数据是否清空完毕】

Empty set (0.00 sec)

mysql> source c:\fruits.sql 【重新做恢复，此时可以看到已经没有出现之前的告警异常信息了】

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.32 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.12 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected (0.03 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 8 rows affected (0.01 sec)

Records: 8 Duplicates: 0 Warnings: 0

Query OK, 0 rows affected (0.01 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected, 1 warning (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

Query OK, 0 rows affected, 1 warning (0.00 sec)

Query OK, 0 rows affected (0.00 sec)

mysql>

标签：rows,affected,Unknown,0.00,OK,sec,mysql,command,Query
来源： https://blog.csdn.net/qq_42048263/article/details/120580831