The sql: component allows you to work with databases using JDBC queries. The difference between this component and JDBC component is that in case of SQL the query is a property of the endpoint and it uses message payload as parameters passed to the query.
So far endpoints from this component could be used only as producers. It means that you cannot use them in from() statement.
SQL component uses following endpoint URI notation
sql:select * from table where id=# order by name?template.maxRows=10
Notice that standard ? symbol that denotes parameters to SQL query is substituted with # symbol as ? symbol is used to specify options for the endpoint.
Rules of treating message body
This component tries to convert the message body to Iterator and then, using this iterator it fills parameters of query.
It means that if the body is not an array, collection of iterator, then this conversion will result in iterator that iterates over only one object that is the body itself.