SQL Language
The SQL support is added by JoSQL and is primarily used for performing SQL queries on in-memory objects. If you prefer to perform actual database queries then check out the JPA component.
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Camel has both a SQL language and a SQL Component. This page is about the SQL language. Click on SQL Component if you are looking for the component instead. |
To use SQL in your camel routes you need to add the a dependency on camel-josql which implements the SQL language.
If you use maven you could just add the following to your pom.xml, substituting the version number for the latest & greatest release (see the download page for the latest versions).
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<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-josql</artifactId>
<version>x.x.x</version>
<!-- use the same version as your Camel core version -->
</dependency>
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Camel supports SQL to allow an Expression or Predicate to be used in the DSL or Xml Configuration. For example you could use SQL to create an Predicate in a Message Filter or as an Expression for a Recipient List.To add an SQL expression to your routing rules its usually easiest to import the SqlBuilder classes methods then you can use the sql() function inside your rules.
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import static org.apache.camel.builder.sql.SqlBuilder.*; ... from("queue:foo").setBody().sql("select * from MyType")).to("queue:bar") |
Syntax
And the spring DSL:
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<from uri="queue:foo"/>
<setBody>
<sql>select * from MyType</sql>
</setBody>
<to uri="queue:bar"/>
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Variables
Variable Expression | Type | Description |
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exchange | Exchange | the Exchange object |
in | Message | the exchange.in message |
out | Message | the exchange.out message |
the property key | Object | the Exchange properties |
the header key | Object | the exchange.in headers |
the variable key | Object | if any additional variables is added using |
...
Loading script from external resource
Available as of Camel 2.11
You can externalize the script and have Camel load it from a resource such as "classpath:"
, "file:"
, or "http:"
.
This is done using the following syntax: "resource:scheme:location"
, eg to refer to a file on the classpath you can do:
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.setHeader("myHeader").sql("resource:classpath:mysql.sql")
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