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138 Simple UML to RDBMS Example
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The primitiveAttributes2columns() query simply invokes the primitiveAttribute2column query for each attribute, returning the results as an ordered set
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query UML::DataType::primitiveAttributes2columns(in targetType: UML::DataType) : OrderedSet(RDB::TableColumn) { selfattributes->collect(a | aprimitiveAttribute2column(targetType))->asOrderedSet() }
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Primitive types are filtered using the isPrimitive() query in the when clause, which checks to see that the targetType parameter is of type UML::PrimitiveType The column s isPrimaryKey property is set using the isPrimaryKey() query, which checks to see that a stereotype is present equal to the String "primaryKey" The name of the primitive type passed in is used as the column name, and the type is set to a PrimitiveDataType object whose name is initialized by the umlPrimitive2rdbPrimitive() query This query uses a simple String comparison of basic types
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mapping UML::Property::primitiveAttribute2column(in targetType: UML::DataType) : RDB::TableColumn when { selfisPrimitive() } { isPrimaryKey := selfisPrimaryKey(); name := selfname; type := object RDB::datatypes::PrimitiveDataType { name := umlPrimitive2rdbPrimitive(selftypename); }; } query UML::Property::isPrimitive() : Boolean { typeoclIsKindOf(UML::PrimitiveType) } query UML::Property::isPrimaryKey() : Boolean { stereotype->includes('primaryKey') } query umlPrimitive2rdbPrimitive(in name : String) : String { if name = 'String' then 'varchar' else if name = 'Boolean' then 'int' else if name = 'Integer' then 'int' else name endif endif endif }
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CHAPTER 13 Query/View/Transformation Operational Mapping Language
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When mapping enumeration attributes to columns, the enumeration Attributes2columns() query invokes the enumerationAttribute2column() mapping for each attribute A when clause checks that the passed property is an enumeration using the isEnumeration() query, which checks that its type attribute is of type UML::Enumeration Again, the isPrimaryKey property is set using the isPrimaryKey() query, and the name attributes are directly mapped The column s type is set to a new PrimitiveDataType object initialized with a name of 'int'
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query UML::DataType::enumerationAttributes2columns(in targetType: UML::DataType) : OrderedSet(RDB::TableColumn) { selfattributes->collect(map enumerationAttribute2column(targetType))->asOrderedSet() } mapping UML::Property::enumerationAttribute2column(in targetType: UML::DataType) : RDB::TableColumn when { selfisEnumeration() } { isPrimaryKey := selfisPrimaryKey(); name := selfname; type := object RDB::datatypes::PrimitiveDataType { name := 'int'; }; } query UML::Property::isEnumeration() : Boolean { typeoclIsKindOf(UML::Enumeration) }
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Relationships are mapped to columns using the relationshipAttributes 2columns() query Unlike the primitive and enumeration types, which map to simple columns, relationships involve the creation of foreign keys The input targetType parameter is passed to the relationshipAttribute 2foreignKey() mapping, where a when clause checks that it is a relationship type using the isRelationship() query In this case, valid relationships are data types that are persistent Looking closer at our relationshipAttributes2columns() query, after the collection of ForeignKey elements, those that are undefined are rejected From this collection, the TableColumn objects from each includedColumns attribute of the foreign keys are collected and returned in an ordered set
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query UML::DataType::relationshipAttributes2columns(in targetType: UML::DataType) : OrderedSet(RDB::TableColumn) { selfattributes->collect(map relationshipAttribute2foreignKey(targetType))->reject(a |
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138 Simple UML to RDBMS Example
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aoclIsUndefined())-> collect(includedColumns)->asOrderedSet(); }
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To create a ForeignKey object from a DataType that is a Relationship, first the key s name is set to the relationship name prefixed with FK The included Columns attribute is set using the dataType2primaryKeyColumns query, which passes a Boolean value equal to the result of the isIdentifying() query This query looks for a stereotype String equal to identifying Finally, the referredUC property is set using a late resolveoneIn class2primaryKey() mapping Using late means the mapping will be invoked at the end of the transformation, which allows for the resolution of objects that might not yet be created Using resolveoneIn returns a primary key object that has previously been created by the type attribute of the passed in property This is accomplished by examining the trace model that is created during the transformation and avoids creating duplicate object instances
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mapping UML::Property::relationshipAttribute2foreignKey(in targetType: UML::DataType) : RDB::constraints::ForeignKey when { selfisRelationship() } { name := 'FK' + selfname; includedColumns := selftypeasDataType()dataType2primaryKeyColumns(selfname, selfisIdentifying()); referredUC := selftypelate resolveoneIn(UML::Class::class2primaryKey, RDB::constraints::PrimaryKey); } query UML::Property::isRelationship() : Boolean { typeoclIsKindOf(UML::DataType) and typeisPersistent() }
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To create primary key columns from data types, two parameters are passed in addition to the data type: a prefix String for the column name and a Boolean to set the isPrimaryKey property The body is a little complicated First the dataType2columns() query is called, and those that are primary keys are selected Then a collection based on TableColumn objects created using passed parameters is returned as an ordered set
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query UML::DataType::dataType2primaryKeyColumns(in prefix : String, in leaveIsPrimaryKey : Boolean) : OrderedSet(RDB::TableColumn) {
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