Definition of PL/SQL Unwrapper
PL/SQL provides different kinds of functionality to the user, in which that unwrapper is the one of functionality that is provided by the PL/SQL. Sometimes we need to hide the code from the end-user, so SQL developers wrap the code, and that means it hides the functionality from the user because of security reasons. There are conditions where you wish to examine the wellspring of a wrapped PL/SQL bundle, technique, or capacity. By using PL/SQL unwrapped, we can easily find out the migration error, or we can say that we can find the root cause faster as compared to other processes.
exec unwrap_r(‘specified sql file name’);
In the above example, we use the exec unwrap_r command to unwrap the wrap PL/SQL procedure. After that, inside the bracket, we need to write the PL/SQL file name, or we can say that actual file name.
How Unwrapper works in PL/SQL?
Now let’s see how unwrapper works in PL/SQL as follows.
In 10g, the reasonable content PL/SQL is scrambled in an accompanying way. The content is first compacted utilizing the Lempel-Ziv calculation, and a SHA1 hash is produced from the packed information. This hash is then duplicated to a cradle, and the packed information is connected as far as possible. Then, at that point, the worth of every byte in the support is utilized as a record into a person replacement table. This table is likely viewed as an Oracle proprietary advantage, so we will shun posting it here – at the very least it is, in any case, simple to discover in parallel. The subsequent code text is then base64 encoded. Opening up the scrambled code is the opposite. In the first place, its base64 was decoded. Then, at that point, every bite is reconstituted with a second relating replacement table. Last, the content is decompressed, leaving the reasonable content of the PL/SQL.
Oracle 9i and prior utilizes a completely extraordinary technique from 10g for wrapping PL/SQL. You saw before that PL/SQL has its foundations in ADA. At the point when the code is enclosed by 9i, it is changed over to DIANA, which represents Descriptive Intermediate Attributed Notation for ADA. One of the plan goals of DIANA was that it would hold the construction of the first source and be completely reversible. In any case, since the opening up and troubleshooting measure is still somewhat awkward for a progression of PL/SQL bundles, the question arrives “Wouldn’t it be pleasant if we would open up PL/SQL bundles straightforwardly in SQL Developer?” and the answer to this question is addressed as yes.
Now let’s see different examples of unwrapped in PL/SQL for better understanding as follows. First, we need to create the procedure file, which means we need a .sql extension file as follows.
CREATE OR REPLACE FUNCTION W_SUM(P_INT1 PLS_INTEGER, P_INT2 PLS_INTEGER)
RETURN P_INT1 + P_INT2;
In the above example, we try to create the function to make the addition of two numbers. Here we initialize the two variables with integer data types such as P_INT1and P_INT2 with integer data types as shown in the above procedure. After that, we make the addition of two numbers and return the sum of numbers. Here we created a very simple function. The final result of the above PL/SQL function we illustrated by using the following screenshot as follows.
PL/SQL executed successfully now saves this procedure on system location with .sql extension file as shown in below screenshot as follows.
Now wrap this file by using the command as follows.
First, we need to search file location. After that, we need to execute the following statement as follows.
In the above example, we use the wrap command with the name keyword as shown; after that, we need to write the file name that we need to wrap. The final result of the above command we illustrated by using the following screenshot as follows.
Let’s see in the above screenshot after the wrap command; it created a new object file that sum_wra.plb as shown. As shown in the following screenshot as follows.
After the creation of the object file, now we are able to see the wrap code as follows.
CREATE OR REPLACE FUNCTION W_SUM wrapped
In the above wrap code, we can only see the function name that means we hide the actual data code of the function from the user. This warp code we executed as per our requirement; the only difference is that here the user cannot interact with code; it only shows the output that means the desired result we will get without any changes.
Now let’s see how we can unwrap this wrap code as follows.
Basically, there are two ways to unwrap the code as follows.
1. Firstly, we just need to right-click in our code and click on the unwrap command. For this command, first, we need to install the PL/SQL unwrapper package on our oracle SQL developer.
After right click shows the unwrap command as shown in the following screenshot as follows.
Now just click on the unwrap command. The final result of the unwraps command is shown in the following screenshot as follows.
2. In the second, we can directly use an online tool to unwrap the code. Here we will see how we can unwrap code by using the online tool as follows.
In the online tool, we need to copy the wrapped code and click on the unwrap button. After completing the execution, it shows the result as shown in the following screenshot as follows.
We hope from this article you learn PL/SQL unwrapper. From the above article, we have learned the basic syntax of the unwrapped, and we also see different examples of the unwrapped. From this article, we learned how and when we use PL/SQL unwrapper.
This is a guide to PL/SQL Unwrapper. Here we discuss the definition, syntax, How unwrapper works in PL/SQL? Examples and code implementation. You may also have a look at the following articles to learn more –