180.8. 使用具有指定查询的消费者

对于只消耗所选实体，您可以使用 consumer.namedQuery URI 查询选项。首先，您必须在 JPA Entity 类中定义命名查询：

@Entity
@NamedQuery(name = "step1", query = "select x from MultiSteps x where x.step = 1")
public class MultiSteps {
   ...
}

@Entity
@NamedQuery(name = "step1", query = "select x from MultiSteps x where x.step = 1")
public class MultiSteps {
   ...
}

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之后，您可以定义消费者的 uri，如下所示：

from("jpa://org.apache.camel.examples.MultiSteps?consumer.namedQuery=step1")
.to("bean:myBusinessLogic");

from("jpa://org.apache.camel.examples.MultiSteps?consumer.namedQuery=step1")
.to("bean:myBusinessLogic");

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