Jdbi - how to bind a list parameter in Java?

Question

We have an SQL statement which is executed by Jdbi (org.skife.jdbi.v2). For binding parameters we use Jdbi\'s bind method:

Handle h         


        

Answer 1

The article you linked also descibes the @BindIn annotation. This provides a general purpose implementiation for lists.

@UseStringTemplate3StatementLocator
public class MyQuery {
  @SqlQuery("select id from foo where name in (<nameList>)")
  List<Integer> getIds(@BindIn("nameList") List<String> nameList);
}

Please note that you'll have to escape all pointy brackets < like this \\<. There is a previous discusion on SO: How to do in-query in jDBI?

Answer 2

I just wanted to add an example since I recently spent considerable time getting a slightly more complex scenario to work :

Query :

select * from sometable where id <:id and keys in (<keys>)

What worked for me :

@UseStringTemplate3StatementLocator
public interface someDAO { 

    ....
    ....
    // This is the method that uses BindIn
    @Mapper(someClassMapper.class)
    @SqlQuery("select something from sometable where age \\< :age and name in (<names>)")
    List<someclass> someMethod (@Bind("age") long age, @BindIn("names") List<string> names);

    @Mapper(someClassMapper.class)
    @SqlQuery("select something from sometable where id = :id")
    List<someclass> someMethod1 (@Bind("id") long id);
    ...
    ...

}

Note: I did have to also add the below dependency since I am using

@UseStringTemplate3StatementLocator 
<dependency>
    <groupId>org.antlr</groupId>
    <artifactId>stringtemplate</artifactId>
    <version>3.2.1</version>
</dependency>

The main thing to observe in the above example : You only need to escape the less than operator (i.e. < ) and not the <> that surround the collection variable (names).

As you can see I did not use a sql.stg file to write my queries in. Initially I incorrectly assumed that when using @UseStringTemplate3StatementLocator , we have to write the queries in the sql.stg file. However, somehow I never got my sql.stg file to work and I eventually reverted back to writing the query within the DAO class using @SqlQuery.