如何将数据插入具有自动递增主键的MySQL？

Question

我创建了一个带有主键并启用的表AUTO_INCREMENT,如何使用MYSQL AUTO_INCREMENT？

CREATE TABLE IF NOT EXISTS test.authors (
    hostcheck_id INT PRIMARY KEY AUTO_INCREMENT,
    instance_id INT,
    host_object_id INT,
    check_type INT,
    is_raw_check INT,
    current_check_attempt INT,
    max_check_attempts INT,
    state INT,
    state_type INT,
    start_time datetime,
    start_time_usec INT,
    end_time datetime,
    end_time_usec INT,
    command_object_id INT,
    command_args VARCHAR(25),
    command_line VARCHAR(100),
    timeout int,
    early_timeout INT,
    execution_time DEC(18,5),
    latency DEC(18,3),
    return_code INT,
    output VARCHAR(50),
    long_output VARCHAR(50),
    perfdata VARCHAR(50)
);

这是我使用的查询,我已尝试""和"1"作为第一个值,但它不起作用.

INSERT INTO  test.authors VALUES ('1','1','67','0','0','1','10','0','1',
'2012-01-03 12:50:49','108929','2012-01-03 12:50:59','198963','21','',
'/usr/local/nagios/libexec/check_ping  5','30','0','4.04159','0.102','1',
'PING WARNING -DUPLICATES FOUND! Packet loss = 0%, RTA = 2.86 ms','',
'rta=2.860000m=0%;80;100;0'); 

Answer 1

如果您希望自动神奇地分配自动增量字段,则将其设置为NULL或0 ...

Answer 2

为了利用列的自动递增功能,在插入行时不要为该列提供值.数据库将为您提供一个值.

INSERT INTO test.authors (
   instance_id,host_object_id,check_type,is_raw_check,
   current_check_attempt,max_check_attempts,state,state_type,
   start_time,start_time_usec,end_time,end_time_usec,command_object_id,
   command_args,command_line,timeout,early_timeout,execution_time,
   latency,return_code,output,long_output,perfdata
) VALUES (
   '1','67','0','0','1','10','0','1','2012-01-03 12:50:49','108929',
   '2012-01-03 12:50:59','198963','21','',
   '/usr/local/nagios/libexec/check_ping  5','30','0','4.04159',
   '0.102','1','PING WARNING -DUPLICATES FOUND! Packet loss = 0%, RTA = 2.86 ms',
   '','rta=2.860000m=0%;80;100;0'
);

Answer 3

该default关键字的工作对我来说:

mysql> insert into user_table (user_id, ip, partial_ip, source, user_edit_date, username) values 
(default, '39.48.49.126', null, 'user signup page', now(), 'newUser');
---
Query OK, 1 row affected (0.00 sec)

我正在运行mysql --version5.1.66:

mysql  Ver 14.14 Distrib **5.1.66**, for debian-linux-gnu (x86_64) using readline 6.1

Answer 4

看看这篇文章

根据它

没有为AUTO_INCREMENT列指定值,因此MySQL会自动分配序列号.您还可以显式为列分配NULL或0以生成序列号.

Answer 5

我在这里看到了三种可能性，它们将帮助您插入到您的表中，而不会弄得一团糟，但“指定”了AUTO_INCREMENT列的值，因为您提供的所有值都可以执行以下任一选项。

第一种方法（提供NULL）：

INSERT INTO test.authors VALUES (
 NULL,'1','67','0','0','1','10','0','1','2012-01-03 12:50:49','108929',
 '2012-01-03 12:50:59','198963','21','',
 '/usr/local/nagios/libexec/check_ping  5','30','0','4.04159',
 '0.102','1','PING WARNING -DUPLICATES FOUND! Packet loss = 0%, RTA = 2.86 ms',
 '','rta=2.860000m=0%;80;100;0'
);

第二种方法（提供'' {Simple quote / apostrophes} 虽然它会给你一个警告）：

INSERT INTO test.authors VALUES (
 '','1','67','0','0','1','10','0','1','2012-01-03 12:50:49','108929',
 '2012-01-03 12:50:59','198963','21','',
 '/usr/local/nagios/libexec/check_ping  5','30','0','4.04159',
 '0.102','1','PING WARNING -DUPLICATES FOUND! Packet loss = 0%, RTA = 2.86 ms',
 '','rta=2.860000m=0%;80;100;0'
);

第三种方法（提供默认值）：

INSERT INTO test.authors VALUES (
 default,'1','67','0','0','1','10','0','1','2012-01-03 12:50:49','108929',
 '2012-01-03 12:50:59','198963','21','',
 '/usr/local/nagios/libexec/check_ping  5','30','0','4.04159',
 '0.102','1','PING WARNING -DUPLICATES FOUND! Packet loss = 0%, RTA = 2.86 ms',
 '','rta=2.860000m=0%;80;100;0'
);

只要您以与创建表时定义的顺序相同的顺序包含所有值，这些示例中的任何一个都应该足以插入到该表中。