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Pertemuan 16 Object Query Language (Lanjutan bagian 3)

Pertemuan 16 Object Query Language (Lanjutan bagian 3). Matakuliah : M0 1 74 /OBJECT ORIENTED DATABASE Tahun : 2005 Versi : 1 / 0. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Mahasiswa dapat Menghasilkan query language dalam object data model (C3).

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Pertemuan 16 Object Query Language (Lanjutan bagian 3)

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  1. Pertemuan 16Object Query Language (Lanjutan bagian 3) Matakuliah : M0174/OBJECT ORIENTED DATABASE Tahun : 2005 Versi : 1/0

  2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • Mahasiswa dapat Menghasilkan query language dalam object data model (C3)

  3. Outline Materi • Retrieving • Creating structured • Creating mutable • Creating collections • Conversion

  4. Retrieving • Definition • Example • Return the existing Product object with the object name, best_seller best_seller • Return a string literal, which is the value of the name attribute of the product object called best_seller best_seller.name

  5. Retrieving • Return a collection-object which contains the existing mutable product object for the bat bike product select p from products p where p.name = “bat bike”;

  6. Retrieving • Return a literal collection-object containing string literals which are the values of the colour attribute of mutable product object select p.colour from products p

  7. Creating structured • Structured-literal (set, bag, list, array, and structure-literal) can be created using the object constructor operators, struct, set, bag, list, and array • Example

  8. Creating structured <query> ::= struct ([<identifier> : <query> [,<identifier> : <query>] *] ) | set ([<query> [,<query> *] )| bag ([<query> [,<query> *] )| list ([<query> [,<query> *] )| array ([<query> [,<query> *] )

  9. Creating mutable • Type names are used as constructor operators to create new mutable objects of the specified type • Example

  10. Creating collections • The select…from…where form of OQL has number of variations which can be used to return different types of collection object • The general form • The distinct • The group by • An order by • Example

  11. Conversion • Listtoset • Distinct • Element • Flatten • Example

  12. SUMMARY • OQL can retrieve existing objects and can also create new ones • New objects can be created using the constructors, set, bag, list, array, and struct • OQL also includes operators for changing the type of an object (listtoset, distinct,element, and flatten)

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