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Simple .NET/ASP.NET PDF document editor web control SDKOnce you have generated a *.snk file, you should regard its contents as extremely sensitive. Given that the whole point of a strong name is to establish your identity in the .NET universe, if another (possibly evil) individual were to gain access to your key information, they could pretend to be you. Assuming this is not the case, you are now able to inform the C# compiler where to find your *.snk file via the /keyfile option. csc /keyfile:mykeypair.snk /t:library *.cs By doing so, your assembly will now be assigned a strong name. Formally speaking, the C# compiler will use data within the supplied *.snk file as so: The full public key is recorded in the assembly s manifest. A digital signature is created based on the private key and a hash code generated using the assembly contents (CIL code / metadata). This digital signature is encrypted into the assembly. Figure 5-3 illustrates the process. (Do recall that a single *snk file contains both the public key and private key data.) print barcode labels in excel 2010, barcode excel 2013 font, barcode generator excel 2016, barcode font excel 2007 download, ms excel 2013 barcode font, barcode generieren excel freeware, excel 2010 barcode add in free, how to add barcode font to excel 2003, barcode activex control for excel 2010 free download, barcode maker excel 2007,n this chapter, we will look at why it is critical for a JDBC programmer working with Oracle databases to learn and master PL/SQL. We will also examine a few PL/SQL techniques that will help you in writing high-performance and more maintainable PL/SQL code. This chapter is by no means comprehensive in terms of explaining how to exploit PL/SQL fully. For a thorough introduction to PL/SQL, I recommend that you read the excellent Oracle documentation in Oracle PL/SQL User s Guide and Reference. For the built-in PL/SQL packages, you can refer to the Oracle documentation in PL/SQL Packages and Types Reference. I also highly recommend reading the book Mastering Oracle PL/SQL by Connor McDonald (Apress, ISBN: 1-59059-217-4). 9 of Effective Oracle by Design by Tom Kyte (Osborne McGraw-Hill, ISBN: 0-07-223065-7) also gives some very useful PL/SQL techniques. Note Discriminated unions are a powerful and important construct and are useful when modeling a finite, In 2, we looked at an example of why you need to know PL/SQL. We revisited the topic in the section Where Should Your SQL Statements Reside, in Java or PL/SQL of 6, where you saw ample justification for why you should, in general, encapsulate your databaserelated logic in PL/SQL and use CallableStatement to call the database-related logic from Java (instead of putting your SQL statement strings in your Java code and invoking them using PreparedStatement). This strategy implies that you need to be a good PL/SQL programmer if you want to write effective JDBC programs. Note that the underlying philosophy is true even if you don t use Oracle, in which case you need to be proficient in the equivalent procedural language of your database (most prominent database vendors provide such a procedural language). In this section, we will summarize and expand on our list of reasons to use PL/SQL extensively in code. Figure 5-3. Key pairs are used to generate a digitial signature for a given assembly Now, assume you have deployed your strongly named assembly to an end user s machine. If an evildoer were to attempt a round trip, she would not have access to your key pair data. Even if this individual specified a new *.snk during compilation process, an entirely new digital signature is produced. In fact, the .NET runtime automatically verifies an assembly s digital signature (provided it has been strongly named) using the following sequence of events: 1. The embedded digital signature is decrypted using the public key. 2. The current assembly s hash is recomputed. sealed set of choices. This makes them a perfect fit for many constructs that arise in applications and symbolic analysis libraries. They are, by design, nonextensible: subsequent modules cannot add new cases to a discriminated union. This is deliberate: you get strong and useful guarantees by placing a limit on the range of possible values for a type. Extensible types can be defined through the use of records of functions and object interface types, discussed in 5 and 6. PL/SQL is a part of the database. When you access data from PL/SQL you re already connected to the database you don t need to make separate round-trips for executing multiple SQL statements. PL/SQL and its data structures are also designed up front to be very closely tied with SQL. For example, when you want to declare a variable that stores a value in the column empno of the table emp in the scott schema, you can (and should) declare it as follows: l_empno emp.empno%type; 3. If the hash values match, the CLR knows the assembly has not been tampered with after deployment. 4. If the hash codes do not match, the CLR refuses to load the binary and throws a FileLoadException. Figure 5-4 illustrates the process. Discriminated union types with only one data tag are an effective way to implement recordlike types: type Point3D let origin = let unitX = let unitY = let unitZ = = Vector3D of float * float * float Vector3D(0.,0.,0.) Vector3D(1.,0.,0.) Vector3D(0.,1.,0.) Vector3D(0.,0.,1.)
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