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When you establish a membership provider to work in conjunction with your ASP .NET 2.0 web application, one option you have is to enable password recovery (which is the case if you are using the default membership provider). Assuming this is the case, you can use the PasswordRecovery control to allow the user to obtain her stored password based on her username, password question, and password answer. To illustrate assume you have a user stored in the project s mdf file that matches the credentials in Table 5-9: Table 5-9. Properties of the PasswordRecovery control
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An empty statement consists of just a semicolon. You can use an empty statement at any position where the syntax of the language requires an embedded statement, but your program logic does not require any action. For example, the following code is an example of using the empty statement: The second line in the code is an empty statement. It is required because there must be an embedded statement between the if part and the else part of the construct. The fourth line is a simple statement, as shown by the terminating semicolon. if( x < y ) ; else z = a + b;
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Important The WCF server created in the previous section must be running before you can create the client. Switch to the project that contains the PublishServer class and select Start Without Debugging from the Visual Studio Debug menu.
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A number of common mistakes are made during design and coding, and these can be on all levels, from very high-level architectural issues, down to individual features implementation and usage. Watch for these mistakes and try to avoid them whenever possible: Lack of database design: Designing a database that is capable of running efficiently with high throughput and fast performance is not the same as designing the objects used in the application server tier. It is necessary to design both the objects and the database; one is not a replacement for the other. For example, some developers erroneously assume that because XML is self-describing, they don t need to design the database schema. Invariably for large systems, this results in danger dead ahead. Of course in these days of agile development, by the time the performance problems surface in production, the development team has already been redeployed onto other projects, which only makes resolving the problem harder. Developing a database-agnostic application: Database agnostic often means using the lowestcommon-denominator features. Such applications normally ignore the extensive features Oracle has incorporated over many releases to aid or improve scalability. The result is bad performance and complaints that Oracle doesn t scale. If the application will be used by a large user population, will have strict response time requirements, must process a large number of transactions, or perform extensive reporting analysis, then significant thought must be given to the database features best leveraged to support the requirements. Complex data design: Sometimes we are forced to make a design more complex than we would like. However, doing so from the outset, without a clear understanding of how the database server functions, indicates that design reconsideration is needed. Flexible design: Decisions that result in a flexible or generic design that allows for future features that may or may not be implemented, often result in a significant performance cost. The misuse and overuse of global unique identifiers (GUIDs): The concept of a global unique identifier is to have an identifier that can be guaranteed to be unique globally. The problem is that GUIDs are misused as unique keys, instead of using a representative unique (or primary) key. Using GUIDs in this way results in the inadvertent insertion of duplicate data and joining more tables. Designing without regard to multirow performance: An extreme example is storing data in long, narrow tables using name-value pairs. The application must do multiple queries to the same table to retrieve data, which would better be served by being stored in one row. The unfortunate side effect is poor performance. Unnecessary feature usage: Sometimes new database features are used because they are cool, and because they exist, rather than because they are necessary to optimal application function. Not using standard, proven database features: Examples include writing your own locking code or writing home-grown sequence-generation code, rather than using those inherent in the database.
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If you ask any user to list their top three priorities for any application (that is, besides, that it give them the correct answer), they most likely would be flexibility, security, and speed. In terms of flexibility, this requirement goes back somewhat to the choice of design methodology. Now, it is true that you can save yourself and your company countless needless headaches by asking as many questions up front about the nature of the company s business and its particular needs as they pertain to the application at hand. However, it is also true that over time there will be questions you could not have anticipated. The types of questions business users ask of their database data can be infinite. If you have not designed your database to be accommodating (as much as is possible) to users who may choose to ask questions via some other route than through the application, you have helped create a recipe for disaster. Users will use your application. However, they will almost certainly have more questions than even the best-planned application can answer. Customers needs change over time. Occasionally, there will be a need for ad hoc SQL. If the design of your system is such that the only way to access the data is through your application, you have ensured that your database is significantly less flexible, and it will have a short-lived ability to support the needs of your users. Data integrity, verification, and security checking performed in the application s middle tier will make your database application perform slower, be less reliable than it would be if you performed these actions at the database level, and will increase your development time drastically. It is odd that some developers feel that if they are not performing these actions in the middle tier (at the application level), they have somehow lost control of their application. This is naive and shortsighted. It is just as naive and shortsighted as any DBA assuming that the design of a database application is not part of a DBA s duties. Though it may not be in your HR-written job description per se, design is certainly your duty if you desire to have any life outside of work. Keep in mind that the further from the database data any security code lives, the less secure your database data. Remember that there are others who can access the database data bypassing your application like you and your DBA colleagues, for instance. This certainly wouldn t put the SarbanesOxley auditors minds at ease. If you cannot prove that every action on the database is auditable (which right now, only Oracle-supplied methods for auditing, or proof that someone has disabled these methods, is available for such access record-keeping), your database data is, as a result, insecure. In terms of speed, many Java developers I have worked with love to perform constraint checking (particularly when checking for uniqueness) in the middle tier. This will never be faster than the native database code in C that already does this, right out of the box. Having to query the database over the network, check the values, and necessarily perform programmatic locks will invariably be much slower than allowing the database to perform its checks immediately upon insertion. Additionally, unless the developers are attempting to write their own database, there is no evidence anywhere that I have seen to support popular assertions that writing your own constraint-checking logic, your own sequencegenerating logic, your own security checks, and, essentially, anything else that your RDBMS can perform for you automatically will do anything for you other than ensure that your customer has wasted lots of money on an RDBMS that is being severely underutilized. This application will never truly scale, never truly meet the needs of its customers, and ultimately be impossibly nightmarish to maintain. These reasons, if none others, should be your primary reasons for wanting to be involved in the design of any database application you will be tasked to support.
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