use datastax java driver to bind data for where in clause

问题

I know somebody has ask this question (http://www.datastax.com/support-forums/topic/java-driver-cql-3-bound-statements-in-clause#post-13114, Prepared Statement with collection in IN clause in Datastax Cassandra CQL driver)

However, I still do not know how to bind data. for example, my preparedStatement is

select * from cf where key in (?)

What I want is bind data and the cql is looks like

select * from cf where key in ('key1', 'key2')

Now I have a boundStatement.

when I use boundStatment.bind() api. I try to bind ? with a List or a Array, however , it says:

Column value is of type varchar, cannot set to a list

Ok, I set a string and use boundStatement.bind like this:

boundStatement.bind("'key1','key2'");

There is no exception, but the resultSet is empty. Why? I think because the driver parse it as

select * from cf where key in (''key1', 'key2'')

(notice a redundant quote because it thinks all the "'key1',and 'key2'" is a string).

So, I know datastax has support in clause. but I can not find some examples ..

Can any help me? Thanks!

回答1:

The correct syntax is:

SELECT * FROM cf WHERE key IN ?

That will allow you to bind a List for the query parameter.

来源：https://stackoverflow.com/questions/27432139/use-datastax-java-driver-to-bind-data-for-where-in-clause