jdbi @sqlquery：无法确定参数$ 1的数据类型

Question

I am trying to add optional/nullable parameters to my sql query.

@SqlQuery("select * from temp where param1 = :param1")
List<Temp> findValues(@Bind("param1") String param1)

Problem: param can be null. So I tried to add null check in the sql query.

SqlQuery("select * from temp where ( (:param1 is not null) and (param1 = :param1"))
This throws the following error: org.skife.jdbi.v2.exceptions.UnableToExecuteStatementException: org.postgresql.util.PSQLException: ERROR: could not determine data type of parameter $1

In my problem I have to add multiple params all of which are nullable. (optional filters)

NOTE coalesce(:param1, param1) = param1 : doesn't work quite right. If param1 is sent, it gives back results where value is either param1 value, or null.

How can I make this null check work? Or is there a way that I can generate the sql query and pass it as a string to @SqlQuery?

I have looked everywhere but can't seem to find a solution. Any help would be appreciated.

Answer 1

If you want to use it as optional filters, you could use @Define. Using @Define, you define attributes for the template engine to use(jdbi v2 uses ST v3 ). Then, your example would look like something like this:

@SqlQuery("SELECT * FROM temp WHERE 1 = 1 <if(PARAM1)> AND param1 = :param1 <endif>)
List<Temp> findValues(@Define("PARAM1") @Bind("param1") String param1)

So, in this way, if value for param1 is null, query will look like:

SELECT * FROM temp WHERE 1 = 1

otherwise:

SELECT * FROM temp WHERE 1 = 1 AND param1 = :param1