Delete where in clause in sqlite

问题

I have the following queries in sqlite which I am using in Xamarin Forms.

allProdsId is initialized as:

allProdsId = new List<Products>();

First of all, I made a query which retrieves all products ID from the table products. Then I want to delete all orders where orders have ProdId all the allProdsId retrieved.

The delete query is not working. Can someone please help me to achieve the WHERE IN clause in sqlite using xamarin forms ?

allProdsId = _con.Query<Products>("Select ProdId from Products");

con.Execute("DELETE FROM Orders WHERE ProdId = ?", allProdsId);

回答1:

Make a comma separated string of all the ProdIds that you wish to delete and insert that directly into the SQL string.

var productIDs = conn.Query<Products>("Select ProdId from Products");
var prodIDCommaString = string.Join(",", productIDs.Select(p => p.ProdId));
var deleteCount = conn.Execute("delete from Products where ProdId in (" + prodIDCommaString + ");");

来源：https://stackoverflow.com/questions/46795270/delete-where-in-clause-in-sqlite