Database Systems: Design, Implementation, Management, Loose-leaf Version
12th Edition
ISBN: 9781305866799
Author: Coronel, Carlos; Morris, Steven
Publisher: Course Technology
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Chapter 15, Problem 5RQ
Program Plan Intro
Open
- Open database connectivity is an Application
Programming Interface (API) used to access the Database Management System (DBMS). - It has the ability of accessing the relational data sources using Structured Query Language (SQL) on any application platform.
Data Source Name (DSN):
- The data source name is used for describing the data source.
- It is used to describe the structure of the current data source.
- It includes attributes like
- Name of the data source
- Location of the data source
- ID and password related to data access
- Information about the database driver
- It includes four different types namely, Machine DSNs, File DSNs, System DSNs and User DSNs.
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Consider the following database for some store:
Customers (cid, cname, city, discount)Agents (aid, aname, city, percent)Products (pid, pname, city, quantity, price)Orders (ordno, mon, cid, aid, pid, qty, dollars)
The relation Customers records the ID (cid), name (cname), location (city) of each customer and a discount percentage (discount) for this customer.
The relation Agents records the ID (aid), name (aname), location (city) of each agent and a transaction fee (percent) charged by this agent.
The relation Products lists the ID (pid), name (pname), location (city), quantity and price of available products.
And finally, the relation Orders contains a unique order number (ordno), the month (mon), customer (cid), agent (aid), product (pid), quantity (qty) of each order as well as the total value (dollars) of the transaction.
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Emp(eid: integer, ename: string, age: integer, salary: real)
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Chapter 15 Solutions
Database Systems: Design, Implementation, Management, Loose-leaf Version
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