I am looking for a few suggestions on how I can integrate database functionality into my WPF application for fast and efficient query processing. Are there libraries I can integrate, or does C# have this built in.
What I intend to have is several tables with less than one thousand entries each. This data is read from an XML file when the application launches and is inserted into tables. All data should reside in memory so no filesystem support is necessary.
Look at ADO.net's DataSet: http://msdn.microsoft.com/en-us/library/ss7fbaez.aspx (emphasis mine):
The ADO.NET DataSet is a memory-resident representation of data that
provides a consistent relational programming model regardless of the
source of the data it contains. A DataSet represents a complete set of
data including the tables that contain, order, and constrain the data,
as well as the relationships between the tables.
There are several ways of working with a DataSet, which can be applied
independently or in combination. You can:
Programmatically create a DataTable, DataRelation, and Constraint within a DataSet and populate the tables with data.
Populate the DataSet with tables of data from an existing relational data source using a DataAdapter.
Load and persist the DataSet contents using XML. For more information, see Using XML in a DataSet (ADO.NET).
See http://msdn.microsoft.com/en-us/library/fx29c3yd.aspx for specifics on "Loading a DataSet from XML".
This is available by default in ADO.Net - one of the base .Net libraries, so it is immediately usable from C# without any additional dependencies. (Technically, C# is just a language - it doesn't provide any libraries.)
You can use ADO.NET Datasets from the xml files. Take a look here for a example
DataSet dataSet = new DataSet();
DataTable dataTable = new DataTable("table1");
dataTable.Columns.Add("col1", typeof(string));
dataSet.Tables.Add(dataTable);
string xmlData = "<XmlDS><table1><col1>Value1</col1></table1><table1> <col1>Value2</col1></table1></XmlDS>";
System.IO.StringReader xmlSR = new System.IO.StringReader(xmlData);
dataSet.ReadXml(xmlSR, XmlReadMode.IgnoreSchema);
Related
I'm attempting to ingest multi-layered XML data from an API in order to insert it into a database.
Firstly, once I've pulled the XML file from the API, I'm using DataSet's ReadXML method to create DataTables. There happens to be 19 in total within the DataSet once ingested.
I understand that I can use DataRelation to link all of the tables, but it looks like the ReadXML method has already inferred some schema info and thus generated what appear to be sensible relationships between each DataTable of the DataSet.
However, I'd like to end up with just one table to port into my database, not 19, and I'd prefer to join/merge/relate the tables in C#, instead of within SQL.
Can you advise on a best practice for creating a single table from all related DataTables within my current DataSet?
I used to work in VB.net and used Dataset's all the time when working with ADO, but now i'm Working in C# and the Research is showing me a lot of Recordsets.
Are they the same thing?
If no what is the difference?
Datasets vs RecordSets
Essentially it is to do with how it fetches the data and allows you to intereact with it, recordsets would typically only allow you to fetch data from one table at a time (with default settings) whereas datasets can retrieve the entire set of data. there is more information at that link
Dataset is a connectionless data holder whereas RecordSet is connection oriented Data holder.Though DataSet you can refer more than 1 table at a time, but in the case of Recordset only 1 table is processed at a time. Through Dataset you can process more than 1 record,but in case of recordset recordset you have to make travesel to each record and after that you can make processing.
a direct quote backing up what i said
Difference between ADO.NET Dataset and ADO Recordset?
ADO.NET is an object-oriented set of libraries that allows you to interact with data sources.
http://www.job4india.in/interview-questions/net-interview-questions
ADO :-
1.It is a COM based library.
2.Classic ADO requires active connection with the data store.
3.Locking feature is available.
4.Data is stored in binary format.
5.XML integration is not possible.
ADO.NET :-
1.It is a CLR based library.
2.ADO.NET architecture works while the data store is disconnected.
3.Locking feature is not available.
4.Data is stored in XML.
Read More :- http://www.job4india.in/net-interview-questions/what-difference-between-ado-and-adonet
No, the DataSet class (System.Data namespace) has the same name in C#. I'm not familiar with anything called recordset in ADO.NET (whereas I am with DataSet). Could you post some examples?
What is dataset and datatable?
How both of them are related to each other.
And what are the uses of it.
I also want to know how to create a dataset manually and display the data in the web page using c sharp.
As i am newbie to .net and c sharp
A data set is a collection of data tables and the relationships between them. It normally represents a set of database tables and the relationships (foreign keys) between them. See DataSet on MSDN.
A data table is usually a representation of a database table, in memory. See DataTable on MSDN.
The uses are that you do not need to go to the database every time you want to lookup a value.
The rest of your question is rather broad and not really answerable, as there are many ways to create a dataset in memory. You need to be much more specific regarding what you are trying to do.
A DataSet is an in memory representation of data,It containing one or more DataTables.
A DataTable is an in-memory representation of data, typically retrieved from a database or XML source.
As far as I remember, a DataSet is a collection of DataTables and the Relations between tables.
A DataTable is an object that represents a table of data similar to a database table.
If I were you I'd avoid the use of DataSets and DataTables as they are fairly heavyweight objects and for simple display you don't need any of the extra features that they provide.
Google for information about DataReaders and maybe DataReaders vs DataTables
I am just learning C# through Visual Studio 2008?
I was wondering what exactly is the correlation between dabases, datasets and binding sources?
As well, what is the function of the table adapter?
At a super high level:
Database -- stores raw data
DataSet -- a .NET object that can be used to read, insert, update and delete data in a database
BindingSource -- a .NET object that can be used for Data Binding for a control. The BindingSource could point to a DataSet, in which case the control would display and edit that data
TableAdapter -- Maps data from a database table into a DataSet
There is a lot more to all of these, and understanding the way ADO.NET is architected can take a bit of time. Good luck!
A DataSet is usually used to hold a result from the database in memory, i.e. it contains a DataTable object. The DataSet and DataTable objects themselfs are independent of the database, so the result doesn't have to come from a database. The DataSet can contain several DataTables, and you can even define relations between them. It's like a mini database in memory.
A binding source is any object that can provide a list of objects with properties. A DataSet or a DataTable can do that, but it could basically be any kind of list containing objects that has properties.
A TableAdapter is used to read data from a DataReader provided by a Command object, and put the data in a DataTable object.
The dataset is a (partial) in-memory representation of a database. Tables or Views in the datatbase are represented as datatables in a dataset. The dataadapter is the link between the database and the dataset. Once the adapter has loaded the data into the dataset, the physical connection to the dataset is disposed. This is why it's called a disconnected data-model.
What is the best way to convert an XML document to a .NET 2.0 DataSet. The XML document contains complex structures with parent-child relationships and should be transformed into multiple tables in the DataSet. The DataSet tables should also maintain the relationship among tables.
right now, I've to write custom XSLT to do this transformation
The best (meaning easiest) way, that also includes all the parent/child relationships is...
DataSet myDataSet = new DataSet();
myDataSet.ReadXml("myXmlFile.xml");
Tada!
BTW, if you have the XML in memory (and not in a file), then you can use one of the "ReadXml" overloads to read it from a stream.