By Scott Urman
Create dynamic client/server purposes utilizing PL/SQL and the great info contained during this authoritative quantity. specialist Oracle insiders disguise the gains of PL/SQL, clarify scripting semantics and syntax, and completely aspect the PL/SQL performance of Oracle Database 10g. You’ll tips on how to write strong PL/SQL courses, have interaction with Oracle databases, practice complicated calculations, and deal with mistakes stipulations.
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A variable declaration specifying VARCHAR2(2) means that the variable can hold two bytes, not two characters. Some Asian characters are up to three bytes, which means that an assignment of a single Chinese character may not fit into a variable with a precision of two. Now that is annoying! 13 14 Oracle Database 10g PL/SQL Programming ■ Support for objects now includes inheritance and type evolution. These were glaring weaknesses in PL/SQL’s OO support. ■ Native compilation allows PL/SQL code to be compiled as C code (Oracle is written in C), reducing time to execute, since no interpretation is required at run time.
2. The first step of the connection wizard prompts for the Connection Name. Enter PLSQL and leave the Connection Type as Oracle (jdbc). Click Next. 3. The next screen prompts for the Username, Password, and Role. Enter plsql for the username and oracle for the password. Leave Role empty, and click Deploy Password. With Deploy Password checked, you will not need to reauthenticate when running PL/SQL against this instance. 4. ora entry we created earlier. Use the following settings and click Next.
Some of the advantages of using object types include ■ Abstraction The application developer is removed from the relational data structures and thinks in terms of real-world structures. ■ Consistency If all application interaction is done through objects rather than directly against the data structures, data corruption becomes much less likely to be introduced. ■ Simplicity Instead of taking a real-world model and converting it to code, the model stays in the real world. If I want to know something about a book object, I look to the book object.