MACROMEDIA COLDFUSION 5-DEVELOPING Bedienungsanleitung PDF herunterladen (Seite 43)

ColdFusion MX 7 Getting Started Experience Tutorial Page 43 of 47

Figure 61. Saving the page

as art.cfc

3. Modify the default CFC template to better reflect your needs. Start by setting the returntype attribute of the

cffunction tag to query, and naming the function getArtwork. Having the access attribute set to public

means that any server can access this function.

4. Delete the cfargument tag, because you do not need it for this function.

5. Modify the cfset tag so that it reads <cfset var artwork="">.

Learning Point: Creating variables

You use the cfset tag to create variables; for example:

You use the cfset tag in the CFC to create, or initialize, the artwork variable. Recall that artwork is also the name of

the query on the index.cfm page. You are going to move the query from the index.cfm page into this function, and the

best practice for naming queries inside of functions is to first initialize them using the cfset tag. In other words, the

artwork variable you just created in the cfset tag is actually just a preparatory space for the query that will eventually

populate it.

6. Update the cfreturn tag so that it references the artwork variable instead of the myResults variable, as the

following code shows:

</cffunction>

</cfcomponent>

Learning Point: CFM and CFC relationship

As mentioned earlier, CFCs only contain the business logic for an application. From the index.cfm page, you call the

getArtwork function, to request that the data be returned to that page. The cfreturn tag is vital for this purpose. In

this example, it is set to return the variable, artwork, which you declared in the cffunction tag’s returntype

attribute as a query.

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MACROMEDIA COLDFUSION 5-DEVELOPING Bedienungsanleitung Seite 43