Part II Using ColdFusion MX with Databases in Java

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Part II Using ColdFusion MX with Databases
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The constituent parts of the recCompany data type must also have their data types defined. Appending %TYPE to a data element returns its data type, so the preceding record definition is equivalent to the following code:
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TYPE recCompany IS RECORD ( vCompanyName VARCHAR2(40), vZipCode VARCHAR2(10) );
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After you have a data type of the same dimension as the rows to be contained by the cursor, you can define a cursor variable to refer to the cursor, as follows:
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TYPE curCompanies IS REF CURSOR RETURN recCompany;
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What this TYPE definition is saying is, Define a cursor variable named curCompanies that returns rows that have the same dimension as the recCompany data type. You repeat the same programming for the second cursor variable curEmployees and you re ready to move on to the package header s interface into the stored procedure. The interface of the stored procedure that returns your two result sets is similar to the stored procedures that you created in the section InOut parameters, earlier in this chapter, in that it contains parameters of specific data types. You declare two input parameters that are used in the WHERE clauses of your two queries, plus you declare two output parameters of the REF CURSOR data types that you defined in the section Oracle stored procedures and packages, as follows:
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rsCompanies OUT curCompanies, rsEmployees OUT curEmployees
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The entire code block that defines the interface into the stored procedure is as follows:
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PROCEDURE sp_GetCompaniesEmployees ( vState IN Char, vName IN Char, rsCompanies OUT curCompanies, rsEmployees OUT curEmployees );
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It defines the interface of the sp_GetCompaniesEmployees stored procedure. Finally, you have the following code:
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END pkg_CompaniesEmployees; /
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It concludes the formal definition of the interface into the pkg_CompaniesEmployee Oracle package.
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The package body
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After the package header is defined, you move on to defining the package body, which contains the actual executable code. Everything coded between the following lines becomes the body of the Oracle package with the header that you define in the preceding section:
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CREATE OR REPLACE PACKAGE BODY pkg_CompaniesEmployees AS . . . END pkg_CompaniesEmployees; /
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If the interface for a stored procedure or function is defined in the package header, that stored procedure or function must be programmed in the package body, and the interface in the body must exactly match its counterpart in the package header. So you start by programming the actual sp_GetCompaniesEmployees stored procedure, as follows:
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PROCEDURE sp_GetCompaniesEmployees ( vState IN Char, vName IN Char, rsCompanies OUT curCompanies, rsEmployees OUT curEmployees ) AS BEGIN OPEN rsCompanies FOR SELECT CompanyName, ZipCode FROM Company WHERE State = sp_GetCompaniesEmployees.vState ORDER BY ZipCode ASC; OPEN rsEmployees FOR SELECT Firstname, Lastname FROM Employee WHERE Lastname LIKE sp_GetCompaniesEmployees.vName || % ORDER BY Lastname ASC, Firstname ASC; END sp_GetCompaniesEmployees;
We ve already covered the interface into the stored procedure in the section The package header, so you now need to look at what the procedure s going to do after it executes. The first thing that sp_GetCompaniesEmployees does is open a cursor named rsCompanies. As defined in the interface, rsCompanies is an output parameter of the data type curCompanies, and curCompanies is a REF CURSOR data type with the same dimensions as a row of the query that the cursor contains. The input parameter vState is used in the WHERE clause to filter the rows returned by the query and placed into the cursor, and the ORDER BY clause sorts the result set in ascending ZipCode order. At this point our cursor contains the static data returned from the query, and our cursor variable named rsEmployees contains a reference to this cursor.
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Part II Using ColdFusion MX with Databases
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After the first cursor is created, the second cursor rsEmployees is created the same way. The input parameter used to filter its result set is concatenated by using the percent character % so that you can perform a pattern search for everything that begins with the character passed in the input parameter vName, as follows:
OPEN rsEmployees FOR SELECT Firstname, Lastname FROM Employee WHERE Lastname LIKE sp_GetCompaniesEmployees.vName || % ORDER BY Lastname ASC, Firstname ASC;
(Oracle uses a pair of pipe characters, ||, as a concatenation operator; many other databases use +, and ColdFusion uses an ampersand, &, as a concatenation operator.) Finally, the definition of the stored procedure is terminated by using an END clause, as follows:
END sp_GetCompaniesEmployees;
And there you have it! Oracle stored procedures take more effort to develop, but after you understand the principles behind them and develop a few examples, they quickly become old hat.