Question

我正在使用WSO2 CEP并创建了以下执行计划：

  define stream sensor1Stream (timestamp string, id string, latitude double, longitude double, altitude double);

  define stream sensor2Stream (timestamp string, id string, latitude double, longitude double, altitude double);

  define stream alertStream (alert_id bool, alert_level string, accuracy_level string, s1_timestamp string, s1_id string, s1_latitude double, s1_longitude double, s1_altitude double, s2_timestamp string, s2_id string, s2_latitude double, s2_longitude double, s2_altitude double);

    from sensor1Stream
    select timestamp as s1_timestamp, id as s1_id, latitude as s1_latitude, longitude as s1_longitude, altitude as s1_altitude
    insert into alertStream(s1_timestamp, s1_id, s1_latitude, s1_longitude, s1_altitude);

    from sensor2Stream
    select timestamp as s2_timestamp, id as s2_id, latitude as s2_latitude, longitude as s2_longitude, altitude as s2_altitude
    insert into alertStream(s2_timestamp, s2_id, s2_latitude, s2_longitude, s2_altitude);

我想在alertStream中插入来自sensor1Stream和sensor2Stream的属性。我已尝试过上述方法，但因错误而无效：

＆＃34;你的SiddhiQL在第39:23行有一个错误，无关的输入＆＃39;（＆＃39;期待{，＆＃39 ;;＆＃39;}＆＃34;

错误发生在alertStream和执行计划最后一行的括号之间。

我不知道我做错了什么。如果有人可以帮我解决这个问题，我将非常感激。

谢谢！

Answer 1

请在下面找到Siddhi执行计划的示例：

@Plan:name('ExecutionPlan')

@Import('org.wso2.event.sensor.stream:1.0.0')
define stream sensor_stream (meta_timestamp long, meta_isPowerSaverEnabled bool, meta_sensorId int, meta_sensorName string, correlation_longitude double, correlation_latitude double, humidity float, sensorValue double);

@Export('org.wso2.sensor.value.projected.stream:1.0.0')
define stream sensor_value_projected_stream (meta_sensorId int, correlation_longitude double, correlation_latitude double, humidity float, value double);

from sensor_stream
select meta_sensorId, correlation_longitude, correlation_latitude, humidity, sensorValue as value
insert into sensor_value_projected_stream;

此示例取自Siddhi示例＆＃39; Pass-Through/Projection Query in an Execution Plan＆＃39;。

您可以在WSO2 CEP文档页面上查看more Siddhi samples here。 This Siddhi QL guide提供有关Siddhi语言的完整参考。

WSO2CEP SiddhiQL - 如何将属性从一个流插入另一个流

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