Download Oracle PL/SQL For Dummies by Michael Rosenblum, Paul Dorsey PDF
By Michael Rosenblum, Paul Dorsey
Find information for developing effective PL/SQL code
If you recognize a piece approximately SQL, this booklet will make PL/SQL programming painless!
The Oracle has spoken—you have to wake up to hurry on PL/SQL programming, correct? we expect it'll be a breeze with this publication! You'll know about code constructions, top practices, and code naming criteria, the best way to use stipulations and loops, the place to put PL/SQL code in approach initiatives, how you can manage information, and more.
Discover how to* Write effective, easy-to-maintain code* try and debug PL/SQL exercises* combine SQL and PL/SQL* follow PL/SQL most sensible practices* Use new positive factors brought in Oracle 9i and 10g
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This isn’t good practice. In a database application, much of the logic is devoted to retrieving and updating information. If the code to accomplish this task resides in an application server, it must send a request to the database over a network. Then the database must process the request and send the information back across the network for the application to process. Because networks and computers are now very fast, you might think that this would take only fractions of a second. Although this is the case for a single request, if a very complex application requires millions or even hundreds of millions of interactions with the database, multiplying the number of interactions by even fractions of a second can lead to very poor performance.
Variable names are PL/SQL identifiers. Therefore all the rules that apply to identifiers, which we explain earlier in this chapter, also apply to variable names. The datatype of the variable may be a standard SQL datatype (NUMBER, VARCHAR2, DATE) or a PL/SQL datatype (BOOLEAN, BINARY_INTEGER). The keyword constant means that the variable’s value can’t be changed in the body of the program. If you declare a variable as a constant, you must assign a default value to it by using the optional DEFAULT value clause.
If you didn’t do it, a bit farther on you find commands for doing it manually. 31 32 Part I: Basic PL/SQL Concepts ߜ Users can be created/dropped/modified/locked from any administrative account. ߜ All objects in the database (tables, procedures, and so on) belong to some user. ߜ Users have privileges and roles (sets of privileges). These roles govern which users can do what. Users could have system privileges (for example, the right to connect) or object privileges (the right to create a table or to update data in somebody else’s table).