Using Advanced Database Techniques in Java

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10 Using Advanced Database Techniques
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cursor variable for compatibility at runtime with each statement that can potentially throw an incompatibility error. Such runtime checking takes time and, therefore, slows down stored procedure operation. Weakly typed cursor variables have their place in advanced Oracle programming, but if you don t absolutely need them, don t use them.
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Abstracting type definitions by using %TYPE to make maintenance easier
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In the section Oracle stored procedures and packages, earlier in this chapter, we said that appending %TYPE to the end of a data element returns the data type of that element This is the preferred method for typing data in Oracle stored procedures, because it abstracts the data type and ties it to whatever the current data element s data type is, as in the following example:
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DECLARE vCompanyName Company.CompanyName%TYPE;
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This code declares the variable vCompanyName as the same data type as that in the CompanyName column of the Company table. So if you change the CompanyName column from a VARCHAR2(40) to a VARCHAR2(65), the vCompanyName variable follows suit and is declared as a VARCHAR2(65) data type as well. This way, you can change the data type of a table column or a variable, and unless the operations on the resulting declared variable are incompatible with the data type, everything continues to work swimmingly.
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Most stored procedures make use of parameters and local variables that eventually hand off their values to table columns for storage. A common (although ill-advised) practice is to name these variables the same as their corresponding table columns for simplicity sake and ease of reading. If you insist on using this practice, you should refer to your variables by using qualified (or long-form) notation to avoid misinterpretation, as in the following example:
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/* This refers to the CompanyName column of the Company table: */ Company.CompanyName /* This refers to a variable declared in the stored procedure sp_Test: */ Sp_Test.CompanyName
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We like to qualify our variables in Oracle, regardless of how they re named. We got into this habit after years of working with other languages (even ColdFusion) that can become confused and throw errors because of naming ambiguities. Really, your best bet is to name your variables slightly differently from their table-column counterparts. Hungarian notation or simply prefixing a v are both useful methods of uniquely naming variables from their table-column counterparts.
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Unlike SQL Server, Oracle does not permit restrictions on parameter size in the interfaces to its stored procedures. The following example is a stored procedure, as written for both SQL Server and Oracle:
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/* As written for SQL Server */ CREATE PROCEDURE sp_GetEmployees ( vFirstname Varchar(20),
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vLastname Varchar(20) ) AS BEGIN Return END /* As written for Oracle */ CREATE OR REPLACE PROCEDURE sp_GetEmployees ( vFirstname IN Varchar2, vLastname IN Varchar2 ) IS BEGIN Return; END sp_GetEmployees; /
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As long as the incoming parameter is of the Varchar2 data type (which is identical to other platforms Varchar data type), it can go into the Oracle stored procedure. If it is of an incorrect size for the stored procedure to handle, the stored procedure throws an exception.
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Practical things that you can do in using stored procedures
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By now, you probably see the benefits of using stored procedures versus standard CFQUERY calls, but what are some of the truly practical uses of stored procedures The following sections take a look at these practical uses.
Note These examples are written for SQL Server, but they can, of course, be adapted for use on Oracle and other platforms.
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There are a number of choices for handling a situation where a user submits a form containing data that is destined for storage in the database, but you don t know whether that person is inserting a new row or updating a row that already exists. One method is to perform a query on the key for that row, check QueryName.RecordCount to see whether the row is found, and then either insert or update based on the result. Another method is to attempt the insert via CFQUERY, catch the primary key constraint violation that is thrown if the row already exists via CFCATCH, and then re-attempt the operation as an update via CFQUERY. Both of these methods are very slow, however, and require multiple requests between ColdFusion Server and your database server. The best way to accomplish this task is to create a single stored procedure that you can call, regardless of whether you re inserting or updating, as shown in Listing 10-27.