MySQL - 无法在列中插入NULL值,但我指定了默认值？

Question

我在MySQL中有一个表,其中有几列指定了默认值,但是当我尝试插入一行时(不指定这些默认列的值),它会抛出一个错误,说我无法插入NULL值.

这是表格示例;

CREATE TABLE `users` (
  `Id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `UniqueName` varchar(120) NOT NULL,
  `Password` varchar(1000) NOT NULL,
  `PublicFlag` tinyint(1) NOT NULL,
  `NoTimesLoggedIn` int(10) unsigned NOT NULL DEFAULT '0',
  `DateTimeLastLogin` timestamp NOT NULL DEFAULT '1971-01-01 00:00:00',
  `UserStatusTypeId` int(10) unsigned NOT NULL,
  `Private` tinyint(1) NOT NULL DEFAULT '0',
  `SiteName` varchar(255) NOT NULL,
  `CountryId` int(10) NOT NULL DEFAULT '0',
  `TimeZoneId` varchar(255) NOT NULL DEFAULT 'UTC',
  `CultureInfoId` int(10) unsigned NOT NULL DEFAULT '0',
  `DateCreated` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `UserCreated` int(10) unsigned NOT NULL,
  `LastUpdatedBy` int(10) unsigned NOT NULL,
  `DateLastUpdated` datetime DEFAULT NULL,
  PRIMARY KEY (`Id`),
  UNIQUE KEY `UniqueName_UNIQUE` (`UniqueName`),
  KEY `Index 3` (`SiteName`)
)

它抱怨TimeZoneId,当我填充TimeZoneId时,它抱怨了CultureInforId.

我正在使用MySQL版本:5.1.43-community

这是我试图插入的插入查询,从NHibernate Profiler抓取:

INSERT INTO Users
           (UniqueName,
            Password,
            PublicFlag,
            NoTimesLoggedIn,
            DateTimeLastLogin,
            SiteName,
            TimeZoneId,
            DateCreated,
            DateLastUpdated,
            Private,
            CountryId,
            CultureInfoId,
            UserCreated,
            LastUpdatedBy,
            UserStatusTypeId)
VALUES     ('zma@zm.com','u1uhbQviLp89P9b3EnuN/Prvo3A4KVSiUa0=',1,
0,'1/01/1971 12:00:00 AM','V9O1T80Q6D',NULL,'2/08/2010 2:13:44 AM',
'2/08/2010 2:13:44 AM',0, NULL, NULL, 4, 4,31)

Answer 1

请改用DEFAULT关键字:

INSERT INTO users (TimeZoneId) VALUES (DEFAULT);

Answer 2

不要插入NULL值.我假设你正在尝试这种语法:

INSERT INTO users VALUES (null, 'Jones', 'yarg', 1, null, null, null);

相反,请使用以下语法:

INSERT INTO users SET UniqueName='Jones', Password='yarg';

有关更多信息,请参阅INSERT上的MySQL文档.

Answer 3

您在尝试INSERT NULL的字段上设置了"NOT NULL".

例如.CountryId,CultureInfoId,TimeZoneId

执行以下操作:

ALTER TABLE `users` MODIFY `CountryId` int(10) DEFAULT '0' NULL;
ALTER TABLE `users` MODIFY `CultureInfoId` int(10) unsigned DEFAULT '0' NULL;
ALTER TABLE `users` MODIFY `TimeZoneId` varchar(255) DEFAULT 'UTC' NULL;

编辑:没有意识到他想要"null"插入默认值而不是NULL.基本上已经建议使用DEFAULT关键字代替值上的NULL.

或者将NULL字段和值完全保留,mysql将使用定义的默认值,例如.

INSERT INTO Users
       (UniqueName,
        Password,
        PublicFlag,
        NoTimesLoggedIn,
        DateTimeLastLogin,
        SiteName,
        DateCreated,
        DateLastUpdated,
        Private,
        UserCreated,
        LastUpdatedBy,
        UserStatusTypeId)
VALUES     ('zma@zm.com','u1uhbQviLp89P9b3EnuN/Prvo3A4KVSiUa0=',1,
0,'1/01/1971 12:00:00 AM','V9O1T80Q6D','2/08/2010 2:13:44 AM',
'2/08/2010 2:13:44 AM',0, 4, 4,31)