将JSON插入Postgres表

Question

在我的Java应用程序中，我想在Postgres表中插入一条新记录，其中一列是JSON类型。

我使用Hibernate 4.x

实体类如下所示：

@NamedNativeQueries({
    @NamedNativeQuery(
                    name = "user.login", 
                    query = "select * from user_login(:ext_user_id, :platform_id,     :server_id, :ip_address, :first_name, :last_name, :additional_data)",
                    resultClass = User.class                        
                )
})
public class User implements Serializable {
    ...
}

实际代码：

Session session = sessionManager.openDBSession();

Query query = session.getNamedQuery("user.login");

PGobject data = new PGobject();
data.setType("json");
data.setValue(additional_data.toString());

query.setString("ext_user_id", ext_uid)
    .setShort("platform_id", (short)platform_id.value())
    .setShort("server_id", server_id)
    .setString("ip_address", ip_address)
    .setString("first_name", fname)
    .setString("last_name", lname)
    .setParameter("additional_data", data);

    UUID sessionId = (UUID) query.uniqueResult();

...

}

失败并显示错误：

org.postgresql.util.PSQLException: ERROR: function user_login(character varying, smallint, smallint,    
character varying, character varying, character varying, bytea) does not exist
Hint: No function matches the given name and argument types. You might need to add explicit type casts.
Position: 55

我做错了什么？