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The only thing that changes between page views is the value of X in the predicate The developer of this application expects that only the value for DEPARTMENT_ID will ever be a number However, a hacker might have very different plans for this predicate, such as returning all rows, or perhaps returning metadata about the database schema to plan an attack The key to preventing SQL injection attacks is the use of bind variables If the structure or semantics of a query can change at runtime, then it is potentially vulnerable to SQL injection Most of the time, the vulnerability is introduced by concatenating variables within the body of the query The example in the preceding paragraph shows the variable X concatenated with the rest of the query The query cannot be parsed before this concatenation occurs, and therefore the concatenation can change the structure of the query every time it is run For our purposes, we can simplify the Oracle SQL parser a bit and assume that it goes through three phases to run a SQL query: parse, bind, and execute In the parse phase, the SQL parser checks that the query is syntactically valid and that all the objects that it references are valid, and then it locks in the structure of the query During the bind phase, the actual values of bind variables are substituted for their placeholders in the query Again, the bind variables can change the value of the placeholder variables, but they cannot change the structure of the query since that was already established during the parse phase The final step is for the SQL parser to execute the query Queries that concatenate, not bind variables, essentially reverse the bind and parse phases The string is concatenated together, including the values of the variables, and then it is parsed This reversal of phases allows an attacker to change the semantics of a query completely at runtime.

A typical VCR can use a camera for recording home video, or can be connected to a TV set to record movies, sports events, newscasts, etc Playback is done through the TV set A VCR allows you to fast-forward and rewind, so that you can skip over parts of a recording or replay certain parts Slow-motion and stop-motion features are also included in many VCRs Video tape, like audio tape, must be protected from magnetic fields and from excessive heat

Understanding AppleScript s various kinds of loops Understanding what hard-coding is and when to use it Repeating actions with a repeat loop Repeating actions a set number of times with a repeat times loop Repeating actions using a loop variable Repeating actions for each item in a list Repeating actions as long as a condition remains true Repeating actions as long as a condition remains false

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A major problem with any recording tape is the fact that the data is strewn out along a highway To get from one bit of information to some other bit, it might be necessary to traverse the entire length of the highway The distance can be hundreds of feet! But on a magnetic disk, no two bits of data are, in practice, ever separated by a distance greater than the diameter of the disk Because of this, disks are faster than tapes for data storage and retrieval Magnetic disks are popular for digital data They aren t often used in analog applications, although R & D continues in the quest for a reliable, high-resolution, magnetic video disk Personal and commercial computers almost always use magnetic disks They come in two forms: the hard disk and the floppy disk or diskette The hard disk in a typical PC can hold several gigabytes of data This figure doubles every few years, and the trend can be expected to continue until the point of diminishing

o work swiftly and efficiently with multiple files, windows, or other objects, you ll often need to repeat one or more actions in your scripts For example, you may need to process several files in Preview, or take the same action in a Microsoft Word document for every paragraph that s formatted with the Normal style This chapter shows you how to repeat actions however many times you need using the various mechanisms that AppleScript provides

To help you better understand the concept of SQL injection, let s construct a procedure that is vulnerable to SQL injection The following procedure takes in a parameter of p_last_name, then outputs all employees that match the parameter (Note that I am using the Q quote mechanism introduced in Oracle Database 10g R2 to make the examples easier to read) The key is that the string is enclosed in the following syntax: q ! some string! This allows strings to contain single quotes without the need to escape those single quotes

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