dataadapter

DataAdapter.Fill to specific table in dataset

由 六月ゝ 毕业季﹏ 提交于 2019-12-11 13:32:23
问题 I am trying to make use of DataAdapter, unfortunately stuck with straight ADO.Net, and all of the examples I see have a call like this: dataAdapter.Fill(dataSet, "TableName"); I want to do a fill in that manner, meaning the data goes into a named table, so that I can properly manage the tables later on in the cycle. Unfortunately, it appears that that method signature no longer exists, and I am struggling a bit to figure out how to name the table in the DataSet properly. Is there a preferred

DataGridView not displaying data while DataSet contains the data

由 只愿长相守 提交于 2019-12-11 13:05:45
问题 In the following code, I can see that my DataSet is already filled with data but my DataGridView displays nothing: string sql = "SELECT * FROM MyTable"; try { ds = new DataSet("Downloads"); using (IDbConnection conn = dataFactory.GetDbConnection()) { conn.ConnectionString = Common.Conf.ConnectionString; da = dataFactory.GetDbDataAdapter(); IDbCommand cmd = dataFactory.GetDbCommand(); cmd.CommandText = sql; cmd.Connection = conn; da.SelectCommand = cmd; conn.Open(); da.Fill(ds); conn.Close();

Updating MySQL returns rows affected, but doesn't actually update the Database

由 寵の児 提交于 2019-12-11 05:37:16
问题 I'm currently using Mono on Ubuntu with MonoDevelop, running with a DataTable matching a table in the database, and should be attempting to update it. The code following uses a Dataset loaded from an XML file, which was created from a Dataset.WriteXML on another machine. try { if(ds.Tables.Contains(s)) { ds.Tables[s].AcceptChanges(); foreach(DataRow dr in ds.Tables[s].Rows) dr.SetModified(); // Setting to modified so that it updates, rather than inserts, into the database hc.Data.Database

How to use SQL Command Builder and SQL Data Apdater

由 人盡茶涼 提交于 2019-12-11 04:27:44
问题 I read SQL Command Builder class from http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlcommandbuilder.aspx and I found that I can show update done on dataset/database using select and update command. SQL Command Builder concept is clear if I am using single dataset but what if I want to use two different dataset? Scenario: I am reading values from database into one dataset ds1; which is assign to sql adapter and sql command builder. Now, I am reading only selected values from

What to look for when setting UpdateBatchSize

由 我的梦境 提交于 2019-12-10 23:12:33
问题 I have a .NET application that is merging two datatables with a lot of rows (10,000+). There is a good chance of having a large number of update/inserts to perform to the SQL table when using the DataAdapter.Update command. Right now, I have the Adapter UpdateBatchSize property set to 200. VS warns against setting this value too high because it may decrease performance. Ok, gotcha. Performance wise, what should I look for when setting this property? No matter what, updating lots of rows will

Updating MS Access Database from Datagridview

由 二次信任 提交于 2019-12-10 22:45:00
问题 I am trying to update an ms access database from a datagridview. The datagridview is populated on a button click and the database is updated when any cell is modified. The code example I have been using populates on form load and uses the cellendedit event. private OleDbConnection connection = null; private OleDbDataAdapter dataadapter = null; private DataSet ds = null; private void Form2_Load(object sender, EventArgs e) { string connetionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data

How to retrieve column default value from MS SQL data table

由 ☆樱花仙子☆ 提交于 2019-12-10 16:39:49
问题 I am using DataAdapter.FillSchema to retrieve tables' schema from MS SQL. Unfortunately this doesn't return the default value for the columns. Is there a way to retrieve this value as part of the schema in a fast and efficient way as I need to examine hundreds of tables? Thanks! 回答1: Default value is determined at the time of row insertion only. As an alternative, you can utilize Information_schema SELECT TABLE_NAME, COLUMN_NAME, COLUMN_DEFAULT FROM AdventureWorks2012.INFORMATION_SCHEMA

Reload data using TableAdapter

由 醉酒当歌 提交于 2019-12-07 11:43:33
问题 private void UserList_Load(object sender, EventArgs e) { // TODO: This line of code loads data into the 'workOrdersDataSet.users' table. You can move, or remove it, as needed. this.usersTableAdapter.Fill(this.workOrdersDataSet.users); } How can I reload the data if changes were made in another form? (preferably automatically without using a Refresh button)? I am using WinForms and the backend is Access 2007. The data is bound using the Designer to a Datagrid 回答1: First, I would move the Fill

C# Issue: What is the simplest way for me to load a .MDB file, make changes to it, and save the changes back to the original file?

由 做~自己de王妃 提交于 2019-12-07 07:43:24
问题 My project that I am working on is almost finished. I am loading a .MDB file, displaying the contents on a DataGrid and attempting to get those changes on the DataGrid and save them back into the .MDB file. I am also going to create a function that allows me to take the tables from one .MDB file and save it to another .MDB file. Of course, I cannot do any of this if I cannot figure out how to save the changes back to the .MDB file. I have researched Google extensively and there are no answers

how to save the DataSet after making changes to the database?

由 主宰稳场 提交于 2019-12-06 21:05:30
if I have a DataSet called myDs and I edit a field in it by direct access in a loop like the following: for (int i = 0; i < myDS.Tables[TableName].Rows.Count; i++) { //some function or web method to get the id value of the record being updated int n = getNewNumber(); //updating the dataset record according to some condition if (n == 0) { myDS.Tables[TableName].Rows[i]["id"] = n; myDS.Tables[TableName].Rows[i]["description"] = "some data"; } else { myDS.Tables[TableName].Rows[i]["id"] = n; myDS.Tables[TableName].Rows[i]["description"] = "new data"; } } How I make these changes done in the
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