红帽全球峰会137.12. 使用命名参数
在下面的给定路由中，我们想要从 projects 表中获取所有项目。请注意，SQL 查询具有 2 个命名参数，：#lic 和 :#min。
然后，Camel 将从消息正文或消息标头中查找这些参数。请注意，在上面的示例中，我们为命名参数设置两个带有恒定值
的标头：
from("direct:projects")
.setHeader("lic", constant("ASF"))
.setHeader("min", constant(123))
.to("sql:select * from projects where license = :#lic and id > :#min order by id")
from("direct:projects")
.setHeader("lic", constant("ASF"))
.setHeader("min", constant(123))
.to("sql:select * from projects where license = :#lic and id > :#min order by id")
尽管消息正文是 java.util.Map，但命名的参数将从正文中获取。
from("direct:projects")
.to("sql:select * from projects where license = :#lic and id > :#min order by id")
from("direct:projects")
.to("sql:select * from projects where license = :#lic and id > :#min order by id")
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