using datareader to query data

... access the XmlDataDocument to perform certain functionality more conveniently than could be accomplished using the DataSet directly To execute an XPath query against the contents of a DataSet, call ... Orders and Order Details data If the Nested property were false, you'd have to use a second XPath query to retrieve the Order Details data from the XMLDataDocument for the DataSet [ Team LiB ] ... DataSet ds; // private void XPathQueryForm_Load(object sender, System.EventArgs e) { ds = new DataSet("Orders_OrderDetails"); SqlDataAdapter da; // Fill the Order table and add it to the DataSet...

Ngày tải lên: 26/01/2014, 10:20

... intended to contain data Their presence is sufficient to convey meaning, as shown in the following example: 10 Module 9: Using XML to Exchange Data The ... observed when using XML to exchange data ix THIS PAGE INTENTIONALLY LEFT BLANK Module 9: Using XML to Exchange Data # Overview ! Introduction to XML ! Validating XML Documents ! Using the Document ... the following example: to this syntax > Module 9: Using XML to Exchange Data XML Syntax (continued) ! Attributes ...

Ngày tải lên: 21/12/2013, 19:15

... alternatives to LINQ to DataSet LINQ to Entities, discussed in Chapter 19, Using LINQ to Entities,” can process external data without the need to load full tables into memory Querying with LINQ to DataSet: ... valid data before you make the query When dealing Chapter 18  Using LINQ to DataSet 309 with data from external sources, you must bring any data you plan to include in a LINQ query into the ... Writing Queries with LINQ to DataSet With the exception of the new enumerated methods specific to LINQ to DataSet, using ADO.NET DataTable objects in LINQ queries is identical to using standard collection...

Ngày tải lên: 03/10/2013, 00:20

... Data Island Use XML-aware browsers to process XML data on the client A common technique is to store the data in an XML data island on the Web page, and bind data controls to the XML data by using ... Using ADO to Access XML Data 31 Best Practices Topic Objective To identify best practices for using ADO to retrieve XML data Lead-in Keep in mind the following best practices when using ADO to ... objStrmResults Module 4: Using ADO to Access XML Data 15 Executing a Query Topic Objective To describe how to execute an XML query Lead-in After all properties have been set, the query can be executed...

Ngày tải lên: 22/10/2013, 16:15

... is to use DataReaders ! Creating a DataReader ! Reading Data from a DataReader ! Demonstration: Accessing Data Using DataReaders ! Using DataSets vs DataReaders The benefit of using a DataSet is ... Module 3: Using ADO.NET to Access Data Creating a DataReader Topic Objective To describe how to retrieve data from a database by using a DataReader Lead-in You can also use a DataReader object to read ... Module 3: Using ADO.NET to Access Data Using DataViews Topic Objective To explain the role of DataViews in accessing data from a database by using DataSets Lead-in To access data from a DataSet,...

Ngày tải lên: 27/10/2013, 07:15

... 2000 data sources You will also learn how to use a Uniform Resource Locator (URL) query to test a virtual directory Module 5: Using HTTP to Access XML Data Publishing SQL Server Data over HTTP Topic ... “virtual root” both refer to an IIS virtual directory 2 Module 5: Using HTTP to Access XML Data Enabling HTTP Access to SQL Databases Topic Objective To introduce the topics in this section Lead-in ... 5: Using HTTP to Access XML Data Web sites Many Web sites are used primarily to publish data Allowing access to a SQL Server database through a virtual directory makes it possible to publish data...

Ngày tải lên: 04/11/2013, 13:15

... pkCols.Add(col); dataTable.Columns.Add(col); } // Add the primary key to the table dataTable.PrimaryKey = (DataColumn[])pkCols.ToArray(typeof(DataColumn)); // Add the table to the DataSet ds.Tables.Add(dataTable); ... created to hold the result set in the DataReader The solution iterates over the rows in the schema DataTable and constructs a DataColumn for each record in the DataReader using the metadata that ... ds.Tables.Add(dataTable); object[] aData = new object[dataTable.Columns.Count]; // Read all rows from the DataReader while(dr.Read( )) { // Read the row from the DataReader into an array dr.GetValues(aData); // Add...

Ngày tải lên: 07/11/2013, 13:15

... Research data is stored in both XML data stores and relational databases 4 Module 8: Using XQuery to Link and Query XML Documents XQuery and XPath 2.0 The ideas incorporated in XQuery for powerful querying ... an SQL query and a current prototype from Microsoft of a basic query interface Module 8: Using XQuery to Link and Query XML Documents 11 Lesson: Using XQuery ! Basic XQuery ! Advanced XQuery ... 8: Using XQuery to Link and Query XML Documents 15 The Future of XQuery ! The universal query language for XML and Web-based data work ! Opens new possibilities to query combinations of data stores...

Ngày tải lên: 10/12/2013, 16:15

... table with Orders DataTable dt = new DataTable( ); da.Fill(dt); // Bind the default view of the table to the grid dataGrid.DataSource = dt.DefaultView; cancelButton.Enabled = true; dataGrid.ReadOnly ... SqlCommand(sqlText, conn, tran); // Create a DataAdapter to retrieve all Orders SqlDataAdapter da = new SqlDataAdapter(cmd); // Define a CommandBuilder for the DataAdapter SqlCommandBuilder cb = new ... connection tran.Rollback( ); conn.Close( ); // Unbind the grid dataGrid.DataSource = null; startButton.Enabled = true; } private void UsingLockingHintsForPessimisticLockingForm_Closing( object sender,...

Ngày tải lên: 14/12/2013, 18:16

... userdefined data type QuoteData Dim qdPriceData As QuoteData() = New QuoteData(10) {} And we could reference the individual elements of a QuoteData array in the following way: qdPriceData(3).dblClose ... dblPriceData As Double() Dim intNumElements As Integer Dim blnMoreData As Boolean Do While blnMoreData intNumElements += ReDim Preserve dblPriceData(intNumElements) ‘ Read data feed and set blnMoreData ... in finance to hold data, matrix math, and build trees for pricing derivatives Important things to take note of are how to employ dynamic array sizing and how to pass and return arrays to and from...

Ngày tải lên: 20/06/2014, 23:20

... static data such as historical price or trade history data, often in a flat file Regardless of the brand of database software, both these types of databases will be managed using the relational database ... types of databases used in financial markets: operational databases and analytical databases Operational databases store dynamic data such as portfolio and position information Analytical databases ... example using a relational database in the front office On a trading desk, we may want to attribute trading profits and losses to different factors so as to assess the success of an automated trading...

Ngày tải lên: 20/06/2014, 23:20

... Let’s create a DataTable and add it to the DataSet Dim dtIBMdata As New DataTable("IBMdata") myDataSet.Tables.Add(dtIBMdata) COLUMNS, DATACOLUMNCOLLECTIONS, AND DATACOLUMNS The DataTable’s Columns ... ADO.NET 211 myAdapter.Fill(myDataSet, "AXPdata") myConnect.Close() DataGrid1.DataSource = myDataSet DataGrid1.DataMember = "AXPdata" Label1.Text = myDataSet.Tables("AXPdata").Rows(0).Item("ClosePrice") ... OleDbDataAdapter(TextBox1.Text, myConnect) myConnect.Open() myDataSet = New DataSet() myAdapter.Fill(myDataSet, "myData") DataGrid1.DataSource = myDataSet DataGrid1.DataMember = "myData" Catch MsgBox("Please enter a valid...

Ngày tải lên: 20/06/2014, 23:20

... suspicious data, fixing bad data, and applying the fix to the data set or preferably saving the data to a new data source The methods we choose to accomplish these three tasks constitute a data transformation ... should be executed using the first button, and all other transactions should be executed using this new, second button The SQL INSERT statement enables us to add data to a table in a database Here ... are using For example, to make your DML changes visible to the rest of the users of the database, you may need to include a COMMIT If you have made an error in updating data and wish to restore...

Ngày tải lên: 20/06/2014, 23:20

... OleDbDataAdapter("Select * From OptionTrades, _ myConnect) Dim myDataSet As New DataSet() myConnect.Open() myAdapter.Fill(myDataSet, "myData") DataGrid1.DataSource = myDataSet DataGrid1.DataMember ... website XML DATA SOURCES ADO.NET provides additional functionality that allows us to convert data in a database into XML VB.NET DataSet objects provide methods that create XML documents from a data ... with options Moreover, the historical simulation method is easy to implement as long as reliable historical data is available If time-series data for the relevant factors is not available, implementation...

Ngày tải lên: 20/06/2014, 23:20

... Dim stock2 As New Stock("INTC", 20, 1.25, 3000) Dim stock3 As New Stock("GE", 50, 0.5, 5000) myPortfolio.Add(stock1.Ticker, stock1) myPortfolio.Add(stock2.Ticker, stock2) myPortfolio.Add(stock3.Ticker, ... –268 Databases, 187 DataColumnCollection, 207 – 208 DataColumns, 207 –208 DataGrids, 201 – 202 DataRowCollections, 208 – 209, 212 – 213, 251 – 252 DataRows, 208 – 209 DataSet model, 202 DataSets, ... 365 – 367 StdNormRand() function, 100 Step Into button, 160 Step Out button, 160 Step Over button, 160 Stock index futures, 54– 60 Stop Debugging button, 160 STP (see Straight-through processing)...

Ngày tải lên: 20/06/2014, 23:20

... profiles, histone modification profiles, and DNA binding data for transcription factors and histone-modifying proteins This large compendium of datasets provides an unprecedented opportunity to investigate ... predictor matrix for each bin These predictor matrices were used to predict expression of transcripts by support vector machine (SVM) or support vector regression (SVR) models The genome-wide data ... may be instructive to build a simpler linear regression model to explore to what extent the chromatin features are redundant, and to what extent they are interacting in a combinatorial fashion Specifically,...

Ngày tải lên: 09/08/2014, 22:23

... ordering Exercise Convert vector data to grid format The objective of this exercise is to learn how to convert vector data, the Rivers.shp theme, into a grid theme of raster data During the conversion ... coordinate to that location When to use raster In some analyses, raster data is more appropriate than vector data Depending on the analysis you're performing, however, vector or raster data or both ... with vector data Spatial coincidence Spatial coincidence is the comparison of two or more layers of data Suitability analysis can be performed by querying spatial and attribute data to determine...

Ngày tải lên: 21/10/2014, 10:10

... large volume database To generate automated reports for human view INTRODUCTION TO OLAP INTRODUCTION TO OLAP  Why we need OLAP ? • • • Increasing data storage Data versus Information Data layout ... easier to write 20 Data warehousing architecture Monitor other DBs OLAP Server Integrator sources Operational & Metadata Analysis Extract Transform Load Refresh Data Serve Query Reports Warehouse Data ... mining Data Marts Data Sources Data Storage OLAP Engine Front-End Tools 21 DATA WAREHOUSE  Applications of data warehouses  Data Mining  Web Mining  Decision Support Systems (DSS) 22 DATA WAREHOUSE...

Ngày tải lên: 14/09/2015, 18:51

... large constant positive constant M is selected to convert the MLL into a maximum one The coefficient a1 to a3 are optimized by trial and error to 0.237 , 0.315 and 0.448 respectively 3.5 Problem ... The term vi is limited to its bounds If the velocity violates this limit, it is set to its proper limit w is the inertia weight factor and in general, it is set according to the following equation: ... The objective of this section is to give a power flow model for a power system with a UPFC device Modified Newton-Raphson algorithm as described in [5] is used to solve the power flow equations...

Ngày tải lên: 05/09/2013, 15:28

... time, work together to exceed those expectations Students will live up, or down, to your expectations Encourage your students to set high expectations of themselves, then challenge them to exceed ... your administration expects a certain percentage on a test or has a goal to reduce absenteeism, work together with the class to exceed those expectations Whatever expectations your students or their ... our expectations Some expectations will be easy to exceed if students not expect to learn anything, for example Work as a team with your class to exceed expectations If your administration expects...

Ngày tải lên: 06/09/2013, 10:10