Download e-book for kindle: Dynamic SQL: Applications, Performance, and Security by Ed Pollack

By Ed Pollack

ISBN-10: 1484218108

ISBN-13: 9781484218105

This e-book is an advent and deep-dive into the numerous makes use of of dynamic SQL in Microsoft SQL Server. Dynamic SQL is vital to large-scale looking dependent upon user-entered standards. it is also beneficial in producing value-lists, in dynamic pivoting of knowledge for company intelligence reporting, and for customizing database items and querying their constitution. Executing dynamic SQL is on the middle of purposes equivalent to company intelligence dashboards that have to be fluid and reply immediately to altering consumer wishes as these clients discover their info and think about the consequences. but dynamic SQL is feared by means of many because of issues over SQL injection assaults. studying Dynamic SQL: functions, functionality, and safety is your chance to benefit and grasp a regularly misunderstood function, together with protection and SQL injection. All features of protection appropriate to dynamic SQL are mentioned during this e-book. you are going to research some ways to avoid wasting time and improve code extra successfully, and you'll perform without delay with safeguard eventualities that threaten businesses world wide on a daily basis. Dynamic SQL: functions, functionality, and safety is helping you deliver the productiveness and user-satisfaction of versatile and responsive functions on your association effectively and securely. Your organization's elevated skill to answer quickly altering company eventualities will construct aggressive virtue in an more and more crowded and aggressive worldwide industry.

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Extra info for Dynamic SQL: Applications, Performance, and Security

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Xp_regread, xp_regwrite, xp_servicecontrol, xp_loginconfig, sp_addextendedproc, and many others can provide far more access to the server and operating system than you would ever want. Be sure to limit access to these so that any user who doesn’t need them doesn’t have them. Other functions that can be dangerous include HOST_NAME(), OPENQUERY(), OPENROWSET(), SHUTDOWN, and KILL. Another scenario that has added further insult to injury has been the desire of hackers to profit off of their escapades.

In order to facilitate this, “WHERE 1 = 1” is the first WHERE clause, followed by each parameter. This ensures that, if all parameters are NULL, you aren’t left with a hanging WHERE keyword and no clauses following it; this would result in an error. Person. Person WHERE 1 = 1 It is likely within any large application where the table you are searching contains thousands (or millions) of rows, that you would not want to allow an empty search like this. It is generally beneficial to require at least one search parameter, which prevents users from blindly returning everything.

This is the same result as the last query, although CASE provides some additional flexibility that you could utilize. If necessary, you could alter the structure of the query to account for missing variables, or have multiple code paths. There is a second way to concatenate strings that can be beneficial under circumstances where the data types and values of the data are unpredictable. Person CONCAT offers several features: 1. NULL parameters are always converted into empty strings. 2. The data type of the result is intelligently determined based on the inputs.

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