红帽全球峰会95.4. 标头值
在 执行更新 操作时，SQL 组件会在以下消息标头中存储更新计数：
| 标头 | 描述 |
|---|---|
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|
更新操作的行数量，返回为 |
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95.4.1. 示例
复制链接链接已复制到粘贴板!
在给定路由中，我们希望从 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 将从消息正文或邮件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了带有恒定值
的两个标头：
from("direct:projects")
.setHeader("lic", constant("ASF"))
.setHeader("min", constant(123))
.to("elsql:projects:com/foo/orders.elsql")
from("direct:projects")
.setHeader("lic", constant("ASF"))
.setHeader("min", constant(123))
.to("elsql:projects:com/foo/orders.elsql")和 elsql 映射文件
@NAME(projects) SELECT * FROM projects WHERE license = :lic AND id > :min ORDER BY id
@NAME(projects)
SELECT *
FROM projects
WHERE license = :lic AND id > :min
ORDER BY id
虽然消息正文为 java.util.Map，则将从正文中获取命名参数。
from("direct:projects")
.to("elsql:projects:com/foo/orders.elsql")
from("direct:projects")
.to("elsql:projects:com/foo/orders.elsql")
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