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QueryConvertForGrid

Last updated on May 30, 2024 | Also applies to ColdFusion

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Description

Converts query data to a structure that contains a paged subset of the query. Used in CFC functions that return data to Ajax format cfgrid controls in response to a bind expression.

Returns

A structure that contains one page of data from the query.

Function syntax

QueryConvertForGrid(query, page, pageSize)

History

ColdFusion 8: Added this function.

Parameters

Parameter	Description
query	Name of the query whose data is returned.
page	The specific page of query data to be returned. Pages are numbered starting with 1.
pageSize	Number of rows of query data on a page.

Usage

You can also create the return value for a cfgrid bind CFC without using this function if your query returns only a single grid page of data at a time. For more information see Using Ajax User Interface Components and Features in the Developing ColdFusion Applications.

Example

The following example shows how a CFC function that is called by an Ajax format cfgrid tag bind attribute. uses the QueryConvertForGrid function to prepare query data to return to the grid. The CFML page with the cfgrid tag has the following code:

<cfform> 
<cfgrid format="html" name="grid01" pagesize=5 sort=true 
bind="cfc:places.getData({cfgridpage},{cfgridpagesize}, 
{cfgridsortcolumn},{cfgridsortdirection})" selectMode="row"> 
<cfgridcolumn name="Emp_ID" display=true header="Employee ID"/> 
<cfgridcolumn name="FirstName" display=true header="Name"/> 
<cfgridcolumn name="Email" display=true header="Email"/> 
</cfgrid> 
</cfform>

The getData function in the places.cfc page has the following code:

<cffunction name="getData" access="remote" output="false"> 
<cfargument name="page"> 
<cfargument name="pageSize"> 
<cfargument name="gridsortcolumn"> 
<cfargument name="gridstartdirection"> 
<cfset query = "SELECT Emp_ID, FirstName, EMail 
FROM Employees" > 
<cfif gridsortcolumn neq "" or gridstartdirection neq ""> 
<cfset query=query & " order by #gridsortcolumn# 
#gridstartdirection#"> 
</cfif> 
<cfquery name="team" datasource="cfdocexamples"> 
<cfoutput>#query#</cfoutput> 
</cfquery> 
<cfreturn QueryConvertForGrid(team, page, pageSize)> 
</cffunction>

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