csharp publicPrimaryKeyAttribute(stringpropertyName,paramsstring[] additionalPropertyNames); 参数 propertyName String 主键中的第一个 (或仅) 属性。 additionalPropertyNames String[] 按顺序构成主键(如果有)的其他属性。 适用于 产品版本 efcore-8.0efcore-8.0 ...
FOREIGN KEY 约束并不仅仅可以与另一表的 PRIMARY KEY 约束相链接,它还可以定义为引用另一表的 UNIQUE 约束。 FOREIGN KEY 约束可以包含空值,但是,如果任何组合 FOREIGN KEY 约束的列包含空值,则将跳过组成 FOREIGN KEY 约束的所有值的验证。若要确保验证了组合 FOREIGN KEY 约束的所有值,请将所有参与列指定为 NO...
For relation R where primary key contains multiple attributes,no non-key attribute should be functionally dependent on a part of the primary key. This relation R is at least in A. 1NF B. 2NF C. 3NF D. BCNF 相关知识点: 试题来源: 解析 B ...
Hi, there are two ways to specify the primary key: When you have just one column in the primary key that also uses auto-increment: Just call the autoIncrement() method on the column getter, like this: https://github.com/simolus3/moor/blob/8fe350219c1040ff88218c12dce977cb28edf7e7/...
});returnnewNEntityPropertySupport(modelerScene.getModelerFile(), attributeEntity); } 开发者ID:jeddict,项目名称:jeddict,代码行数:20,代码来源:PropertiesHandler.java 示例4: getPrimaryKeyJoinColumns ▲点赞 3▼ importorg.netbeans.jpa.modeler.spec.PrimaryKeyJoinColumn;//导入依赖的package包/类protected...
LOWER_ATTRIBUTE_NAMES OBJECT OBJECT_TRANSFORM UPPER_ATTRIBUTE_NAMES Spatial functions AddBBox DropBBox GeometryType H3_Boundary H3_Center H3_FromLongLat H3_FromPoint H3_Polyfill ST_AddPoint ST_Angle ST_Area ST_AsBinary ST_AsEWKB ST_AsEWKT ST_AsGeoJSON ST_AsHexWKB ST_AsHexEWKB ST_AsText ST...
t4.AddPrimaryKey(c); }if(ad.type == AttributeType.MultiValued) mulAttribute = ad; } }if(hasPrimaryKey) { t4.AddColumnFK(pk1); t4.AddColumnFK(pk2); t4.AddColumnFK(pk3); }else{ t4.AddPrimaryKeyForeignKey(pk1); t4.AddPrimaryKeyForeignKey(pk2);if(f) ...
DisplayCategoryAttribute DisplayNameDescriptionAttribute DisplayOrderAttribute DrawManager FileBasedBaseNode GetStringDelegate HierarchyNode HierarchyNode.NodeStateFlags HierarchyNodeContainer HierarchyNodeList HierarchyNodeListForXMLSerializer IPreloadable IScriptingOptions ISessionController ISqlToolsHierarchy ISql...
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KeylessAttribute ModelBuilder ModelConfigurationBuilder ModelCreationDependencies ModelExtensions MutableAnnotatableExtensions MutableEntityTypeExtensions MutableForeignKeyExtensions MutableKeyExtensions MutableModelExtensions MutableNavigationExtensions MutablePropertyBaseExtensions MutablePropertyExtensions MutableTypeBaseExtensions...