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Database Concepts

Database Concepts. CPTE 212 3/13/2014 John Beckett. Why use a database?. Self-documenting Self-organizing Extensible More data per ? More transactions per hour. How to access a database. < Write a program to read and write files DBMS included a DBML Database Management Language

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Database Concepts

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  1. Database Concepts CPTE 212 3/13/2014 John Beckett

  2. Why use a database? • Self-documenting • Self-organizing • Extensible • More data per ? • More transactions per hour

  3. How to access a database • < Write a program to read and write files • DBMS included a DBML Database Management Language • Standard DBML - > SQL

  4. HW Server (Linux) HTTP GET, POST Web App Server Client HTML, Binary DB Server Prot SQL Results (Objects) DB Server Prot Database Server (MySQL)

  5. Programming for the Web • Connect to the database server • Username / password • …implies privileges • Yields a connection object • Select a database • Send SQL • Receive results from it • Close the connection For all of these, Possibility of error result

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