TAILIEUCHUNG - Oracle Unleashed- P18

Oracle Unleashed- P18: When I first started using Oracle many years ago, it was possible to know the database and the tools available. With the rash of recent releases of different options for the database and the spate of new tools, only people who wear their underpants over their trousers will be able to know everything there is to know about the Oracle products. | Reducing Oracle Communication Overhead Reducing Processing Overhead New Features in Version Summary 50 Oracle Precompilers Extracting and manipulating data from a relational database would be very difficult if not for tools such as precompilers. The precompiler allows SQL statements to be embedded within procedural languages. Applications developed with this tool can use the best features of SQL combined with the best features of the procedural language creating a powerful module. This chapter discusses Oracle precompilers creating a source program and some of the new features that Version precompilers have. Oracle Precompilers The precompiler is a mechanism that allows SQL statements to be embedded within procedural languages. This tool provides the programmer with unlimited capabilities. To fully understand all the benefits of this tool this chapter will focus on why we precompile general features of the precompiler what languages source code can be written in how standardized are the precompilers what options do they have how to precompile your source code and what is conditional precompiling. Why Precompile Source Code Embedded SQL statements are not something a high-level language understands. The precompiler must therefore take the SQL statements and translate them into something the high-level language will understand. Libraries contain data structures that help guide the translation process for consistency. This general concept will help in understanding the precompiler features. General Precompiler Features One of the primary reasons to use a precompiler is to have the capability of utilizing SQL statements in a high-level language. Oracle precompilers offer many benefits and features that can help in this development. These features include the following Source code can be written in six different high-level languages which all have ANSI ISO precompilers. Using a precomplier enables a user to take advantage of dynamic SQL which allows for a more

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