pdf to excel javascript

pdf to excel javascript

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In most of the examples so far, the property has been associated with a field, and the get and set accessors have referenced that field. However, a property does not have to be associated with a field. In the following example, the get accessor computes the return value. In the following example code, class RightTriangle represents, not surprisingly, a right triangle. It has two public fields that represent the lengths of the two right-angle sides of the triangle. These fields can be written to and read from. The third side is represented by property Hypotenuse, which is a read-only property whose return value is based on the lengths of the other two sides. It is not stored in a field. Instead, it computes the correct value, on demand, for the current values of A and B. Figure 6-11 illustrates read-only property Hypotenuse. class RightTriangle { public double A = 3; public double B = 4; public double Hypotenuse { get{ return Math.Sqrt((A*A)+(B*B)); } } }

So, you ll be tempted to put the keys in the application that resides outside of the database That ll work to a degree; it ll solve the problem of what happens when someone steals my database because they won t have the keys But you really haven t solved the problem; you still have to have a method to release the keys to the application itself As connections are added by your application server, they would need access to this key to encrypt and decrypt information How do they get it Do you store it in a file so it could be automatically retrieved If so, does that mean you are storing the key in an unprotected file in clear text (Yes, it does.

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) So, maybe you ll encrypt that file with the keys in it, which leads us back to the problem of how to get the key to decrypt the file with the other keys in it So you end up writing a key server process that can be started by someone and a password (key) passed to it so it can decrypt the file and serve keys out to the applications as they request them, but then this server must implement non-repudiation (be sure of valid clients only), anti-data tampering, and the network encryption In addition to that, you have to make sure the backup and recovery of this key store is managed in conjunction with the database In order to properly restore a database, you ll need the keys that were in place at the time the database was backed up.

You can tailor the way that your objects are serialized and deserialized by applying one of four attributes to methods in your class. Listing 23-8 contains an example of using one of these attributes. Listing 23-8. Using a Serialization Callback Attribute using System; [Serializable] class Person { private string name; [NonSerialized] private string city; public Person(String nameParam, String cityParam) { name = nameParam; city = cityParam; } public String Name { get { return name; } set { name = value; }

setup. Coverage of how to configure a shared server is beyond the scope of this book but is covered in detail in the Oracle Net Services Administrator"s Guide.

If you don t have them, your data will be unavailable So now there is coordination between the application server backup and the database backup And, just to keep going on this thread, there is the problem of periodic re-keying of data Many standards and legal regulations mandate the periodic changing of the keys to protect data The thought is, the longer a key is used, the higher the probability the key has been compromised So there must be some way to change the keys used to encrypt data over time You ll have to not only write the processes that re-keys (decrypt your data with the old key and encrypt with the new key), but ensure you can maintain the history of keys in the event you need to restore a database at some point.

To compound this problem, consider an environment where you have some data sharing going on Suppose your transaction system must feed data into an Operational Data Store which, in turn, feeds a Data Warehouse If you encrypt the data in one, you better encrypt it in the other, and so on Key management has just gone up another level in complexity In other words, you would be reinventing the entire framework Oracle provides and calls Transparent Data Encryption I am not a fan of reinventing the wheel, and this is a really hard wheel to reinvent in a secure fashion, so I m not going to spend much time on this approach in the Implementing Manual Application Encryption section beyond introducing the packages available and demonstrating how to measure their performance impact..

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