在Pentaho报表设计器中使用参数生成SQL查询

Question

I created two parameters named id and task_name in Pentaho report designer. Display type of both of them are drop down. When I am trying to change the query based on the parameters I didn't get any data in the drop-down. But the data of the drop-down display when I do not edit the query with parameters My query is

SELECT * 
FROM tbl_project_tasks 
WHERE id = ${id}

can anyone help?

Answer 1

In the parameter you'll find a field named Query . This query should not be the main query mentioned above. You should create a new query in which you only select the id from your data base. Name it idparameter for example. It goes like this:

SELECT id 
FROM tbl_project_tasks

Now in the parameter select idparameter in Query , id in Value and id in Display Name . Make sure that the name of the parameter in Name is the same as the one in the ${} in the main query.

Hope that was the answer for your question.