New Query Functions Released (Open BlueDragon Blog)

New Query Functions released

Published: 2:01 PM GMT, Friday, 1 January 2010

We've justed finished the a whole new set of functions to help with the manipulation of Query objects and their respective datasources.

The following table highlights all the current functions within the Query category available in the OpenBD (nightly build) release:

DatasourceCreate	Adds a new datasource to the system for use with any database functions. This does not persist over server restarts
DatasourceDelete	Removes the given datasource. Note, it will not remove any datasource that was registered with the underlying bluedragon.xml file
DatasourceIsValid	Checks to see if a given datasource has been previously registered using DataSourceCreate()
QueryAddColumn	Adds a new column of data to the exist query object, returning the column number
QueryAddRow	Adds the specified the number of rows to the end of the query
QueryColumnArray	Returns all the data in a query for a given column
QueryColumnList	Returns all the data in a query for a given row but as a structure
QueryDeleteColumn	Deletes the column from the query, returning the deleted column data as an array
QueryDeleteRow	Deletes the row within a query object. Modifies the original query object
QueryIsEmpty	Determines if the query has any rows
QueryNew	Creates a new query object with the columns past in of the optional types
QueryOfQueryRun	Executes a Query-of-Query against a previous SQL result sets. Function version of CFQUERY
QueryRowStruct	Returns all the data in a query for a given row but as a structure
QueryRun	Executes the given SQL query against the given datasource, optionally passing in paramters. Function version of CFQUERY
QuerySetCell	Sets the given column within a query with the value at the given row, or the last row if not specified
QuerySort	Sorts the query based on the column specified and the order criteria given. Modifies the original query object
QuotedValueList	Returns a quoted list of all the values, for a given column within the query, delimited by the value given
ToCsv	Transforms the query object into a Comma Separated Value (CSV) block
ToHtml	Transforms the query object into an HTML TABLE block
ValueList	Returns a list of all the values, for a given column within the query, delimited by the value given

These functions will greatly increase the speed and efficiency to which you can work with Query objects.

Many of the functions where available using other means. For example, QueryDeleteColumn could have been achieved by performing a query-of-queries leaving out the column you wanted to remove. This however had a huge overhead, as well as duplicating the data.

You can read more about the DataSource functions over at Alan Williamson's blog.

Thanks to Peter J Farrell for many of his suggestions.

via blog.openbluedragon.org

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