org.teiid.translator.mongodb

Class MongoDBDirectQueryExecution

java.lang.Object

org.teiid.translator.mongodb.MongoDBBaseExecution

org.teiid.translator.mongodb.MongoDBDirectQueryExecution

All Implemented Interfaces:

Execution, ProcedureExecution, ResultSetExecution

public class MongoDBDirectQueryExecution
extends MongoDBBaseExecution
implements ProcedureExecution

This enables the Direct Query execution of the MongoDB queries. For that to happen the procedure invocation needs to be like {code} native('CollectionName;{$match : { \"CompanyName\" : \"A\"}};{$project : {\"CompanyName\", "userName}}', [param1, param2]) {code} the first parameter must be collection name, then the arguments must match the aggregation pipeline structure delimited by semi-colon (;) between each pipeline statement select x.* from TABLE(call native('city;{$match:{"city":"FREEDOM"}}')) t, xmltable('/city' PASSING JSONTOXML('city', cast(array_get(t.tuple, 1) as BLOB)) COLUMNS city string, state string) x select JSONTOXML('city', cast(array_get(t.tuple, 1) as BLOB)) as col from TABLE(call native('city;{$match:{"city":"FREEDOM"}}')) t;

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean	returnsArray

Fields inherited from class org.teiid.translator.mongodb.MongoDBBaseExecution

connection, executionContext, metadata, mongoDB

Constructor Summary

Constructors

Constructor and Description
MongoDBDirectQueryExecution(List<Argument> arguments, Command cmd, ExecutionContext executionContext, RuntimeMetadata metadata, MongoDBConnection connection, String nativeQuery, boolean returnsArray, MongoDBExecutionFactory ef)

Method Summary

Modifier and Type	Method and Description
void	cancel() Cancels the execution abnormally.
void	close() Terminates the execution normally.
void	execute() Execute the associated command.
List<?>	getOutputParameterValues() Get the output parameter values.
List<?>	next() Retrieves the next row of the resultset.
com.mongodb.DBObject	nextRow()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

returnsArray

protected boolean returnsArray

Constructor Detail

MongoDBDirectQueryExecution

public MongoDBDirectQueryExecution(List<Argument> arguments,
                                   Command cmd,
                                   ExecutionContext executionContext,
                                   RuntimeMetadata metadata,
                                   MongoDBConnection connection,
                                   String nativeQuery,
                                   boolean returnsArray,
                                   MongoDBExecutionFactory ef)

Method Detail

execute

public void execute()
             throws TranslatorException

Description copied from interface: Execution

Execute the associated command. Results will be retrieved through a specific sub-interface call.

Specified by:

execute in interface Execution

Throws:

TranslatorException

getOutputParameterValues

public List<?> getOutputParameterValues()
                                 throws TranslatorException

Description copied from interface: ProcedureExecution

Get the output parameter values. Results should place the return parameter first if it is present, then the IN/OUT and OUT parameters should follow in the order they appeared in the command.

Specified by:

getOutputParameterValues in interface ProcedureExecution

Throws:

TranslatorException - If an error occurs while retrieving the output value

next

public List<?> next()
             throws TranslatorException,
                    DataNotAvailableException

Description copied from interface: ResultSetExecution

Retrieves the next row of the resultset.

Specified by:

next in interface ResultSetExecution

Returns:

the next row or null indicating that there are no more results

Throws:

TranslatorException

DataNotAvailableException

nextRow

public com.mongodb.DBObject nextRow()
                             throws TranslatorException,
                                    DataNotAvailableException

Throws:

TranslatorException

DataNotAvailableException

close

public void close()

Description copied from interface: Execution

Terminates the execution normally.

Specified by:

close in interface Execution

cancel

public void cancel()
            throws TranslatorException

Description copied from interface: Execution

Cancels the execution abnormally. This will happen via a different thread from the one performing the execution, so should be expected to happen in a multi-threaded scenario.

Specified by:

cancel in interface Execution

Throws:

TranslatorException