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#foreignKey
ORA-46010: The colValue of foreignKey of inheritedFrom “string” is too long.
文档解释ORA-46010:ThecolValueofforeignKeyofinheritedFrom“string”istoolong.Cause:ThespecifiedlengthforthecolValueelementoftheforeignKeyelementoftheinheri...
IT技术学习
·
2023-07-26
of
ORA-46010
The
colValue
foreignKey
ORA-46016: Number of columns of foreignKey does not match primaryKey.
文档解释ORA-46016:NumberofcolumnsofforeignKeydoesnotmatchprimaryKey.Cause:ThenumberofcolumnelementswithintheforeignKeyelementdidnotmatchthenumberofcolumnelementswit...
IT技术学习
·
2023-07-23
of
ORA-46016
Number
columns
foreignKey
ORA-46007: No colName foreignKey for inheritedFrom element “string”.
文档解释ORA-46007:NocolNameforeignKeyforinheritedFromelement“string”.Cause:NocolNameforeignKeywasspecifiedforaninheritedFromelementintheDataSecuritypoli...
IT技术学习
·
2023-07-11
ORA-46007
No
colName
foreignKey
for
ORM之ForeignKey操作
数据量比较大,不会使用FK,允许出现数据冗余。对象查找(跨表)语法:对象.关联字段.字段示例:book_obj=models.Book.objects.first()#第一本书对象print(book_obj.publisher)#得到这本书关联的出版社对象print(book_obj.publisher.name)#...
代码星球
·
2020-12-29
ORM
ForeignKey
操作
laravel Call to undefined method 1IlluminateDatabaseQueryBuilder::getForeignKeyName() or 1IlluminateDatabaseQueryBuilder::getQualifiedForeignKeyName()
vendor/laravel/framework/src/Illuminate/Database/Eloquent/Relations/BelongsTo.php添加!!!!!!!publicfunctiongetForeignKeyName(){$segments=explode('.',$this->getQ...
代码星球
·
2020-06-20
1IlluminateDatabaseQueryBuilder
laravel
Call
to
undefined
Django:model中的ForeignKey理解
有两个数据模型栏目模型和文章模型ArticleColumn和ArticlePostArticleColumn:classArticleColumn(models.Model):#用户与栏目是“一对多”关系,所以用ForeignKey,一个用户可以设置多个栏目,此处的user字段对应实际表中的us...
代码星球
·
2020-04-02
Django
model
中的
ForeignKey
理解
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