Spring Integration - Externalizing JDBC Queries

Question

Is there a simple way to externalize big sql queries from jdbc outbound gateways, instead of inlining it? The reason being that we\'re having to many big queries to make, an

Answer 1

Yes, you can put them in a properties file, and use properties placeholders ${...} to resolve them, or you can use SpEL...

"#{myQueryBean.queryOne}"

where myQueryBean is a <bean/> that's an instance of a class with a method...

public String getQueryOne() {...}

or a static constant on a class...

"#{T(foo.Queries).QUERY_ONE}"

public static final String QUERY_ONE = "...";

Answer 2

You can define your queries in XML as spring beans:

<bean id="exampleQuerySql" class="java.lang.String">
    <constructor-arg>
      <value>
          <![CDATA[
select * from foo
where whatever_ind = 'A'
          ]]>
      </value>
    </constructor-arg>
</bean> 

Using CDATA the query text can include newlines, angle brackets, etc., so it's legible and you can cut and paste it directly into a SQL tool.

You can refer to the bean using SpEL.