QueryCondition Interface Reference
[Query Conditions]

<<interface>> These are specialised com.rti.dds.subscription.ReadCondition objects that allow the application to also specify a filter on the locally available data. More...

Inheritance diagram for QueryCondition:

List of all members.

Public Member Functions
String	get_query_expression ()
	Retrieves the query expression.
void	get_query_parameters (StringSeq query_parameters)
	Retrieves the query parameters.
void	set_query_parameters (StringSeq query_parameters)
	Sets the query parameters.

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Detailed Description

<<interface>> These are specialised com.rti.dds.subscription.ReadCondition objects that allow the application to also specify a filter on the locally available data.

Each query condition filter is composed of a com.rti.dds.subscription.ReadCondition state filter and a content filter expressed as a query_expression and query_parameters.

The query (query_expression) is similar to an SQL WHERE clause and can be parameterised by arguments that are dynamically changeable by the set_query_parameters() operation.

Two query conditions that have the same query_expression will require unique query condition content filters if their query_paramters differ. Query conditions that differ only in their state masks will share the same query condition content filter.

Queries and Filters Syntax describes the syntax of query_expression and query_parameters.

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Member Function Documentation

String get_query_expression

(

)

Retrieves the query expression.

void get_query_parameters

(

StringSeq

query_parameters

)

Retrieves the query parameters.

Parameters:

query_parameters

<<inout>> the query parameters are returned here.

void set_query_parameters

(

StringSeq

query_parameters

)

Sets the query parameters.

Parameters:

query_parameters

<<in>> the new query parameters