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Chapter 20

Chapter 20. Database Connectivity. Client Server. Enables a user on a PC to run standard business applications and access corporate shared resources over a network connection. Types of Servers. Print servers File servers Application servers. 3 software layers. Presentation logic

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Chapter 20

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  1. Chapter 20 Database Connectivity

  2. Client Server • Enables a user on a PC to run standard business applications and access corporate shared resources over a network connection

  3. Types of Servers • Print servers • File servers • Application servers

  4. 3 software layers • Presentation logic • Business logic (application) • Database management systems

  5. Centralized vs Distributed • Centralized utilizes a host computer that is accessed using dumb terminals • Distributed processing involves the utilization of multiple computers to fulfill a service request

  6. Two Architectures for Client Server • Two-tiered architecture • Fat client • Database server • Three-tiered architecture • Thin client • Application server • Database server

  7. Fat client • Has presentation software • Has application software • Has API software • Some DBMS software

  8. Thin client • Has presentation software • Some DBMS software

  9. Gateways • Allows clients (or other requestors) to access data stored on various formats • This is a translation type of software that can take a request in one language (SQL) and translate it to something else (DL1, flat files, etc.)

  10. Internet Issues • Availability • Maintenance • Automate functions • Use utilities • Exploit hardware technologies

  11. New Technologies • XML • Java – 3 types of programs • Applets • Servlets • Applications • Java also has JDBC and SQLJ

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