我刚刚创建了一个Django项目,并直接在mysql中添加了2个:
1)金融控股(tbl_holdings)
2)服务提供商(tbl_holdings_service_providers)
它们在My Sql中的数据定义都是:
tbl_holdings
CREATE TABLE `tbl_holdings` (
`id` int(11) NOT NULL AUTO_INCREMENT,`item_code` varchar(5) NOT NULL,`product_name` varchar(45) NOT NULL,`service_provider` varchar(100) NOT NULL,`account_details` varchar(100) NOT NULL,`purchase_cost` int(15) NOT NULL,`current_value` int(15) NOT NULL,`purchase_date` timestamp NULL DEFAULT NULL,`updated_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,`created_at` timestamp NULL DEFAULT CURRENT_TIMESTAMP,PRIMARY KEY (`id`),UNIQUE KEY `item_code_UNIQUE` (`item_code`),KEY `fk_service_provider_name_idx` (`service_provider`),CONSTRAINT `fk_service_provider` FOREIGN KEY (`service_provider`) REFERENCES `tbl_holdings_service_providers` (`provider_name`) ON DELETE NO actION ON UPDATE NO actION
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=latin1
tbl_holdings_service_providers
CREATE TABLE `tbl_holdings_service_providers` (
`id` int(11) NOT NULL AUTO_INCREMENT,`provider_name` varchar(100) NOT NULL,KEY `INDEX` (`provider_name`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=latin1
我在Django models.py中创建了相关模型
class TblHoldings(models.Model):
item_code = models.CharField(unique=True,max_length=5)
product_name = models.CharField(max_length=45)
service_provider = models.ForeignKey('TblHoldingsServiceProviders',models.DO_NOTHING,related_name='service_provider',db_column='service_provider')
account_details = models.CharField(max_length=100)
purchase_cost = models.IntegerField()
current_value = models.IntegerField()
purchase_date = models.DateTimeField(blank=True,null=True)
updated_at = models.DateTimeField(blank=True,null=True)
created_at = models.DateTimeField(blank=True,null=True)
class Meta:
verbose_name = 'Holding'
verbose_name_plural = 'Holdings'
managed = False
db_table = 'tbl_holdings'
class TblHoldingsServiceProviders(models.Model):
provider_name = models.CharField(max_length=100)
updated_at = models.DateTimeField(blank=True,null=True)
class Meta:
verbose_name = "Lookup For Service Provider"
verbose_name_plural = 'Lookup For Service Providers'
managed = False
db_table = 'tbl_holdings_service_providers'
并且admin.py中的代码是
@admin.register(TblHoldings)
class HoldingsAdmin(admin.ModelAdmin):
list_display = ('item_code','product_name','service_provider','current_value','created_at')
ordering = ('purchase_date',)
search_fields = ('product_name',)
@admin.register(TblHoldingsServiceProviders)
class HoldingsServiceProviderAdmin(admin.ModelAdmin):
list_display = ('id','provider_name','created_at')
ordering = ('created_at',)
search_fields = ('provider_name',)
在尝试添加馆藏时,出现以下错误:与外键约束有关
/ p / admin / app_fin / tblholdings / add /中的IntegrityError(1452,'无法添加 或更新子行:外键约束失败 ({
_finance
。tbl_holdings
,约束fk_service_provider
外键(service_provider
)参考tbl_holdings_service_providers
(provider_name
)不删除任何操作 ON UPDATE)')请求方法:POST请求 网址:admin / app_fin / tblholdings / add / Django 版本:2.2.7异常类型:IntegrityError异常值:(1452, '无法添加或更新子行:外键约束失败 ({_finance
。tbl_holdings
,约束fk_service_provider
外键(service_provider
)参考tbl_holdings_service_providers
(provider_name
)不删除任何操作 ON UPDATE)')异常 位置:/root//venv/lib/python3.6/site-packages/MySQLdb/connections.py 在查询中,第231行Python 可执行文件:/ root // venv / bin / python Python版本:3.6.8 Python路径:['/ root // project_', '/root//venv/lib/python36.zip', '/root//venv/libremoved/python3.6', '/root//venv/lib/python3.6/lib-dynload', '/usr/lib/python3.6', '/root/_fin/venv/lib/python3.6/site-packages']服务器 时间:2019年11月12日星期二09:51:28 +0000
有人能指出我做错了什么吗?