tableadapter

问题 I'm kind of new to C# and am trying out the convenient looking adaper-dataset combo with local database. while I was amazed at how easy and useful it was I stumbled upon an issue: Whenever I try to fill the Item table with the adapter I get Invalid object name SQLexception, I use the same Dataset for all my tables, dsOns.Users / dsOns.Items. The problem is, the users adapter does recognize and successfully works with Users database(dbo.Users) while the items adapter cannot find the table(dbo

问题 Suppose I have a DataGridView that is loading from a TableAdapter whose content is from 2 JOINed tables, so Table C is: SELECT A.*, B.name LEFT JOIN B ON B.id = A.b_id No UpdateCommand is generated for this by the wizard, I know. However, if the data of the table is almost entirely from Table A, and Table B is only joined in to provide the name of data referenced by id in Table A, can I just supply my own UpdateCommand that updates Table A if the user changes a value in the DataGridView? That

问题 I want to change the query in table adapter but it's not opening & throwing an error " Configure table Adapter Failed " & in property of connectionString it says " Unable to find connection 'ConnStringName' for object 'Web.config'. The connection string could not be found in application settings, or the data provider associated with the connection string could not be loaded " 回答1: I have been looking for a solution for this problem for a long time. Thankfully I found a solution that worked

问题 I have a query that I wish to run through an ASP.NET TableAdapter that contains an 'IN' clause which is to receive it's values through a parameter. My question is, how do I specify this parameter? I thought of writing the conditional statement like this: AND b.group_category_id in (@ParamList) where the @ParamList is a String of the parameters, e.g. "4,12,45,23" but since the specified id is an Integer, it complains that it cannot convert String to Integer. This makes sense, but is there any

问题 I recently began using the Async CTP and while I have found it quite useful with Self Coded classes and the like, I have run into a bit of a snag when trying to implement it with Generated Code, specifically the TableAdapters that are generated when you work with a Dataset. I have an application that uses .Fill calls quite a bit to populate DataGrids and Databindings. Since .Fill blocks and my users need to be able to interact with the application while this is going on, I see the Async CTP

问题 I've got the following query that returns 2 records (in DataSet's query builder) SELECT EmpID, Name, id FROM Users WHERE (CAST(id AS Varchar(20)) IN ('5688','5689')) Now if I do the same query passing the parameter instead from code behind: String param = "'5688','5689'"; it returns null. WHERE (CAST(id AS Varchar(20)) IN (@param)) I tried taking off the very first and last ', but that did not make a diffrence. !!!id is a unique PK!!! Anyone's got a clue? 回答1: The solution I found is quite

问题 I'm trying to generate a Insert method in a TableAdapter with a query like INSERT INTO Status (ScheduleID, StatusID, Name, Color) VALUES (?, ?, ?, ?) Here Name is a string and the other are integers. The generated signature however looks like this: InsertQuery(int Color, string Param2, string Param3, string Param4) Which does not match the query, either in name or order of parameter types. How can this happen? How can I be sure that Parameter2 is StatusID if I decide to change it manually?

问题 I hope someone can help with this one. I've been trying to create a new base class for a WinForm. What I want to do is have this base class go through all the tableadapters it has on it and update their connection strings without anyone adding any code to the form. They just put the tableadapters on the form and don't worry about the connection string settings as it's all handled in the base class. The problem I'm having is my reflection code can find the property fine but can't set it. Can

问题 Here is everything that I did: In a visual studio 2013 C# project, I created a service database (.mdf file). Note: I changed the name from Database1.mdf to fghLocalDB.mdf. I opened this database in the server explorer. I created 2 tables called Country and CarbonDioxide using the table designer. I added an entry to the Country table as shown by the Data Table of the Country table. I did the following to create a DataSet my application can use. I created a Data Source by clicking on the

问题 How do table adapters make use of connections? To explain that a bit, do they automatically open and shut connections or if I already have the connection open before calling a tableadapter method, do they use it and leave it open? Regards 回答1: If you look at the designer-generated code, you'll see that if there is a connection, the adapter reuses it, otherwise it creates a new one. When executing a query method, if the connection isn't open, the method opens it. If the method opened it, it