By Adam Machanic
This booklet bargains a different point of view on database improvement concerns. It first provides and explains complex options then demonstrates their use in a number of company eventualities. The objective is professional mastery of either techniques and their program. the focal point all through is on professional improvement of real-world database purposes.
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Extra resources for Expert SQL Server 2005 Development (Expert)
Sample text
In database terms, this means that an API would expose public interfaces for retrieving data from, inserting data into, and updating data in the database. A set of database interfaces should comply with the same basic design rule as other interfaces: well-known, standardized sets of inputs that result in well-known, standardized sets of outputs. This set of interfaces should completely encapsulate all implementation details, including table and column names, keys, indexes, and queries. An application that uses the data from a database should not require knowledge of internal information—the application should only need to know that data can be retrieved and persisted using certain methods.
Qxd 4/20/07 10:31 AM Page 15 CHAPTER 1 ■ SOFTWARE DEVELOPMENT METHODOLOGIES FOR THE DATABASE WORLD CREATE TABLE Products ( UPC INT NOT NULL PRIMARY KEY, Weight DECIMAL NOT NULL, Price DECIMAL NOT NULL ) CREATE TABLE Books ( UPC INT NOT NULL PRIMARY KEY REFERENCES Products (UPC), PageCount INT NOT NULL ) CREATE TABLE DVDs ( UPC INT NOT NULL PRIMARY KEY REFERENCES Products (UPC), LengthInMinutes DECIMAL NOT NULL, Format VARCHAR(4) NOT NULL CHECK (Format IN ('NTSC', 'PAL')) ) Although this model successfully establishes books and DVDs as subtypes for products, it has a couple of serious problems.
Frederick P. Brooks, The Mythical Man-Month (Boston, MA: Addison-Wesley, 1995), pp. 122. qxd 30 4/20/07 10:33 AM Page 30 CHAPTER 2 ■ TESTING DATABASE ROUTINES Regression testing is also the key to newer software development methodologies, such as Agile Development and eXtreme Programming. As these methodologies increase in popularity, it can be expected that database developers will begin to adopt some of these techniques more readily. Guidelines for Implementing Database Testing Processes and Procedures Of all the possible elements that make up a testing strategy, there is really only one key to success: consistency.