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Informatiesystemen in de Bouw 7M711

Informatiesystemen in de Bouw 7M711. Week 3. Joran Jessurun en Jos van Leeuwen. Database. A database is a collection of data. Databases can be stored in one or more files, or can be managed by a software system called Database Management System (DBMS). What makes a database. Add Data

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Informatiesystemen in de Bouw 7M711

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  1. Informatiesystemen in de Bouw 7M711 Week 3 Joran Jessurun en Jos van Leeuwen

  2. Database • A database is a collection of data. • Databases can be stored in one or more files, or can be managed by a software system called Database Management System (DBMS)

  3. What makes a database • Add Data • Delete Data • Change Data • Lookup or search for data • Organize Data

  4. Key Terminology • Table • Column • Record • Field • Primary Key • Foreign Key

  5. Types of databases • Flat databases • Index databases • DBMS based databases

  6. DBMS Services • Schemas • Consistency checks • Guarantee of no data corruption after crash • Concurrent access for multiple readers and writers. • Backup and recovery • Authentication and access control • Support for Structured Query Language (SQL)

  7. DBMS Flavors • From relational • To object oriented

  8. DBMS Systems • Oracle • Sybase • Microsoft SQL Server • MySQL

  9. Paradox • Indexed Database • Every table is contained in a *.DB file • The primary key is indexed in a *.PX file • Accessed trough the Borland Database Engine

  10. Borland Database Engine • Database independent • Adds services for flat and indexed database access • Used by Delphi • Makes use of Aliases • Like Microsoft’s ADO components

  11. UML Profile for Database Design • Rational Software Corporation • For designing databases • Uses tagged parameters and stereotypes • Only a subset will be explained

  12. Database Diagram Elements • Table • Column • Primary key • Foreign key • Identifying relationship • Non-identifying relationship

  13. Database Diagram Elements (2) Table (stereotype <<table>>) Not used Not used Primary key (stereotype <<pk>>) Foreign key (stereotype <<fk>>) Primary/Foreign key (stereotype <<pk/fk>>) Non-identifying relationship Identifying relationship

  14. Example 1

  15. Mapping Logical Design To Database Design • Synchronization • Classes > Tables • Attributes > Columns • Associations > Relations • Normalization • There are more ways to do it

  16. Mapping Classes To Tables • Map persisted classes to tables • Many to many associations must be broken down to one to many associations using an association table.

  17. Mapping Subtype Classes to Tables • One table per class • One table per concrete class • One table per hierarchy

  18. Mapping Attributes to Columns • Map persistent attributes • Don’t map calculated attributes • Can use Generic Types first, later use database specific types. Generic Types: Boolean, Currency, Date, Double, Integer, Long, Single, String

  19. Example 2

  20. Database Desktop • Create and fill tables • Execute database queries • Build on BDE

  21. Database Desktop Example

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