dataadapter

问题 I am populating the ListView from my Custom DataAdaptor. I have a layout defined for each item/row of the listview. Inside that ListView i have an AutoCompleteTextView. I need to bind it with data from SQLite database. Actually this AutoCompleteTextView will list categories & these categories will come from a SQLite Table.I can bind it in my Custom DatAdapeter class inside getView() but i don't know how to avoid the multiple calls to the SQLite database? As the categories will remain the same

问题 I'm currently working on a program that allows for connections to multiple provider specific databases, so obviously I'm using the non-provider-specific classes (in System.Data.Common) to work with these various connections once the connection or data adapter has been instantiated through the use of the provider's implementation. However, I wanted to make use of the RowUpdated and RowUpdating events that are supposedly a part of the DataAdapter base class according to MSDN (http://msdn

问题 I'm currently working on a program that allows for connections to multiple provider specific databases, so obviously I'm using the non-provider-specific classes (in System.Data.Common) to work with these various connections once the connection or data adapter has been instantiated through the use of the provider's implementation. However, I wanted to make use of the RowUpdated and RowUpdating events that are supposedly a part of the DataAdapter base class according to MSDN (http://msdn

问题 Is there any difference between these two methods? Both return an opened SQLiteDatabase. Both can create a database if one doesn't exist. SQLiteOpenHelper also has getWriteableDatabase when read/write is needed... Which method should I use and where? Based on sample code I've seen, I'm using SQLiteOpenHelper to create my database in the first place, but then calling SQLiteDatabase.openDatabase when I need to use the database. 回答1: The openDatabase() is more flexible allowing you to specify

问题 I'm using SqlDataAdapter.Update(DataTable) to throw a table at the database, but the SqlDataAdapter ignores my InsertCommand to write its own, which only sends the primary key and all the rows that can be null if they want. How do I get it to behave? I step through the code before and after I call Update(). Before, it's my InsertCommand. After, it's the SqlDataAdapter's. Edit: I don't especially want to post code samples because I can take the row I have and write my own SqlCommand object

问题 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;

问题 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;

问题 REMARK I completely rewrite the question as while exploring options and getting insights, I realized the origin of my problem was not at all what I thought. I use Firebird as a database engine and the standard .Net provider (v.5.11.0) to fetch data using following code: // myBlob1 is BLOB SUB_TYPE 1 (text field) with some empty, but some // VERY long stuff (xml-content) which exceeds VARCHAR(32765), but I removed // those before performing my tests!!! var tick = Stopwatch.StartNew();

问题 Since I have a "DB util" class with a DataSet QueryDB(string spName, DBInputParams inputParams) method which I use for all my calls to the database, I would like to reuse this method in order to support transacted calls. So, at the end I will have a SqlDataAdapter.Fill within a SqlTransaction. Will this be a bad practice? Because rarely I see usage of DataAdapter.Fill within a transaction and more often ExecuteReader(). Is there any catch? Edit1: The thing is that inside my transaction is

问题 I've been reading through the MSDN resources and several forums and still don't understand what's the difference between those two dataAdapter.Fill() and dataAdapter.Update() , I tried to use both of them to update the database from my program and it works, but when I try to remove the update() function, it is still working perfectly, therefore I think of it as useless. Can anyone please clarify this? Edit: this is my code to delete: string connString = "Provider=Microsoft.ACE.OLEDB.12.0;Data