database programming in visual c net using ado net

... settings in App.Confi g is checked since we need this connection string when we access our database as the project runs Also change this connection string to EDModelEntitiesConnString as shown in ... Database Connection: You can choose an existing connection from the list of connections or click New Database Connection to open the Connection Properties dialog box and create a new connection ... visual tools for creating and editing an EDM The ADO.NET EDM Designer includes the following components: • A visual design surface for creating and editing the conceptual model You can create,

Ngày tải lên: 26/01/2014, 08:20

... source and controls on the Visual C# windows form object Furthermore one can build simple Practical Database Programming With Visual C#.NET,... Selection Query with Visual C#.NET ... programming language such as Visual C++, Visual Basic, Visual J#, and Visual C# The Toolbox window in Visual. .. build simple database applications without needing to touch very complicated ... collections, generic collections b. Generic collections, nongeneric collections c. All collections, partial collections d. .NET Frameworks 2.0,. NET Frameworks 3.5 2. The query variable used in

Ngày tải lên: 26/01/2014, 08:20

... this string based on the real location in which you save your database D The Connection object accConnection is initialized with the connection string and a con-nection is executed by calling ... DataSet (); string connString = "Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source=C:\\database\\Access\\CSE_DEPT.accdb;" ; accConnection = new OleDbConnection (connString); DataTable ... database CSE_DEPT.accdb, which is developed in Microsoft Access 2007 You need to modify this string based on the real location in which you save your database D The Connection object accConnection

Ngày tải lên: 26/01/2014, 08:20

... MFC CDatabase class CDatabase encapsulates and simplifies the code for connecting to ODBC databases Line 6 calls the Cdatabase 's OpenEx function to connect to (or open) a database Line 8 allocates ... http://www.simpopdf.com Trang 14In Listing 1.3, line 1 defines the data filename Lines 2-23 define two structures and declare an instance of each TheTeach Yourself Database Programming with Visual C++ 6 in 21 ... Teach Yourself DatabaseProgramming with Visual C++ 6 in 21 Days Introduction Week 1 at a Glance Chapter 1 Choosing the Right Database Technology Chapter 2 Tools for Database Development in Visual

Ngày tải lên: 13/08/2014, 08:20

... pointers to two ADO COM interfaces Lines 4 and 6 call CoCreateInstance to createinstances of the ADO interfaces and assign the pointers to them (You will learn more about CoCreateInstance andCOM ... use to indicate whether the connection is open Listing 4.5 Changes to the Document Header File 1: class CADOMFC1Doc : public CDocument Teach Yourself Database Programming with Visual C++ 6 in 21 ... brace in lines 8 and 9 Add the close brace and the catch blocks in lines 23-38 The catchin line 24 catches _com_error exceptions, which is the type that ADO throws _com_error is another of the COMsupport

Ngày tải lên: 13/08/2014, 08:20

... should consider using a stored procedure called from an ADO Command object The only caveat for ADO Command objects seems to be that the process of changing parameter values in the Parameters collection ... mechanisms is called a constraint. Constraints are rules for valid data that the database enforces for you. You can place different kinds of constraints on the database For instance, you can place a primary ... build the schema of your database, which includes tables, indexes, andconstraints Indexes can enable better query performance Constraints can help ensure theintegrity of the data inside the database

Ngày tải lên: 13/08/2014, 08:20

... an instance of the ADOConnection class Finally, COM returns the pointer to the ADO Connection object the client application thatcalled CoCreateInstance The process of a client calling CoCreateInstance ... http://www.simpopdf.com Trang 5Listing 9.5 will produce this output:Executing myFunc in myBaseClass Executing myFunc in myDerivedClass Executing myFunc in myBaseClass Executing myFunc in myDerivedClass Which class's ... object, you write some code that calls CoCreateInstance or the smart pointer class'sCreateInstance function and pass it the CLSID of the ADO Connection object The code for the CoCreateInstance (in

Ngày tải lên: 13/08/2014, 08:20

... records, using the code in lines 37 through 58 The user can edit the records' contents in the grid The user can cancel those changes by clicking the Cancel button, which executes the code in lines ... Server, it makes an interprocess communication (IPC) connection with the database The interprocess communication mechanism is Teach Yourself Database Programming with Visual C++ 6 in 21 days Day ... Figure 11.3, fat clients contain business logic This business logic may include code for formulas or rules to perform calculations on business data, or it may include code that accesses tables and

Ngày tải lên: 13/08/2014, 08:21

... the cacheinstead of the database Using a cache provides significant performance benefits because accessing data in RAM is much faster thanaccessing data in a database A cache can also reduce the ... application by using the ODBC API NOTE Although this section introduces certain steps in developing an ODBC application, it isn't intended to be a complete reference Many ODBC programming references ... the database itself CDaoDatabase The CDaoDatabase wrapper class encapsulates the CdbDBDatabase object, and all connection information is contained within it An application will declare and instantiate

Ngày tải lên: 13/08/2014, 08:21

... a COM component should remind you of an object In fact, a COM component is an object that uses the rules in the COM specification to provide access to the component's interface Interface Factoring ... QueryInterface method succeeded or failed Listing 17.1 defines a function called CheckInterface You could use the function in Listing 17.1 in OLE DBconsumer applications to discover which interfaces an OLE ... supports CheckInterface takes asingle parameter that defines the interface ID and returns 1 if the interface is supported or 0 if not Listing 17.1 The CHECKINTERFACE Function 1: int CheckInterface(IUnknown*

Ngày tải lên: 13/08/2014, 08:21

... Today's business concludes by discussing several issues related to command processing: How to create and execute commands Creating and Executing a Command The process of creating and executing commands ... DBACCESSORFLAGS *pdwFlags, ULONG *pNumBindings, DBBINDING *prgBinding); HRESULT ReleaseAccessor(HACCESSOR hAccessor, ULONG *pRefCount); Reference counts control how many times an Accessor is currently ... StateOrProvince, CompanyName ASC If the ordering directive (ASC or DESC) is omitted, the records will be sorted in ascending order by default DISTINCT and DISTINCTROW The DISTINCT clause removes duplicate

Ngày tải lên: 13/08/2014, 08:21

... a BLOB column by using the OLE streaming interfaces Day 20 covers these interfaces in more detail, including how to use them to access BLOB columns. Unicode String Processing Unicode strings are ... generic string functions for Unicode characters in Visual C++, you must use the #define _UNICODE directive and include the <wchar.h> header files.● Cursors The final topic for today is cursors ... actually takes a collection of DBPROPIDSET structures,which in themselves contain a collection of property IDs You will typically define a single DBPROPIDSET structure, which contains a collection

Ngày tải lên: 13/08/2014, 08:21

... begin by using the GetErrorInfo method to access the IErrorInfo interface If theinterface isn't available, use the CreateInstance method of the IClassFactory interface to create a newIErrorInfo ... the IDBCreateSession interface of the DataSource object and how to create a Command object by using the IDBCreateCommand interface of the Session object. The section on Command objects includes ... ISQLErrorInfo InterfaceThe final error-related interface covered today is the ISQLErrorInfo interface This interface is used in the custom errorobject pointer of an error record You access the

Ngày tải lên: 13/08/2014, 08:21

... Microsoft Access database, but we can set up an indirect relationship between them using the LINQ to ADO .NET since ADO .NET covers any kinds of database including the Microsoft Access 2007. In ... OleDbCommand(); SelectionForm selForm = new SelectionForm(); OleDbDataReader accDataReader; accCommand.Connection = accConnection; accCommand.CommandType = CommandType.Text; accCommand.CommandText ... CSE_DEPT.accdb and located at C: \database\ Access directory. B. By using the keyword new , we create a new instance of the connection class OleDbConnection with the connection string we built in...

Ngày tải lên: 17/10/2013, 19:15

... MessageBox.Show("No matched faculty_id found!"); } accCmdCourse.Connection = logForm.accConnection; accCmdCourse.CommandType = CommandType.Text; accCmdCourse.CommandText = strCourse; accCmdCourse.Parameters.Add("@Param2", ... Jenney King MTC-324 course_id faculty_id classroom CSC-131A A52990 TC-109 CSC-13 1C A52990 TC-109 CSC-132A J33486 TC-303 CSC-132B B78880 TC-302 CSC-230 A77587 TC-301 CSC-232B A77587 TC-303 CSC-233A ... using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.OleDb; using System.Drawing; using System.Linq; using System.Text; using...

Ngày tải lên: 20/10/2013, 11:15

... the codes shown in Figure 5.162 into this constructor. using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.OracleClient; using ... oraDataReader.Close(); } A B C D OracleSelectRTObject.LogInForm cmdReadLogIn_Click() Figure 5.164 Coding for the ReadLogIn button Click method. private void cmdCancel_Click(object sender, ... System.Data; using System.Data.Linq; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; namespace SQLSelectRTObjectLINQ { public partial class FacultyForm...

Ngày tải lên: 20/10/2013, 11:15

... the source fi le for each class such as LogIn.cs, Grid.cs, Faculty.cs, Cource.cs, Selection.cs, and Student.cs by opening the Code Window of each form; then change the namespace to SQLInsertWizard. ... Microsoft Access 2007 database, CSE_DEPT.accdb, which was developed in Chapter 2 and is located in the folder Database\ Access located at the accompanying site: ftp://ftp.wiley.com/public/sci_tech_med/practical _database ... Button cmdInsert True Insert 6 Button cmdSelect True Select 7 Button cmdCancel True Cancel 8 Button cmdBack True Back 9 PictureBox PhotoBox True Form InsertFacultyForm True CSE_DEPT Insert Faculty...

Ngày tải lên: 24/10/2013, 09:15

... AccessInsertRTObject.sln ã AccessInsertRTObject.csproj ã AccessInsertRTObject.exe ã AccessInsertRTObject.pdb ã AccessInsertRTObject.cshost.exe ã AccessInsertRTObject.xml To rename ... LogInForm logForm = new LogInForm(); logForm = logForm.getLogInForm(); accCommand.Connection = logForm.accConnection; accCommand.CommandType = CommandType.Text; accCommand.CommandText = cmdString; ... following Window Form object fi les and change the namespace from SQLInsertRTObject to AccessInsertRTObject: ã LogIn Form.cs ã Selection.cs • Faculty Form.cs • Course Form.cs • Insert Faculty...

Ngày tải lên: 24/10/2013, 09:15

... the actual data type of the objects stored in the sequence. LINQ is composed of three major components: LINQ to Objects, LINQ to ADO. NET, and LINQ to XML. Where LINQ to ADO .NET contains LINQ ... develop a piece of code in Visual C# .NET to call this stored procedure to insert a new data into the database. 2. Figure 6.89 shows a piece of code developed in Visual C# .NET, and this coding is ... by using the project AccessInsertRTObject (the project fi le is located at the folder DBProjects\Chapter 6 located at the accompanying ftp site (see Chapter 1 ). 5. Using the stored procedure...

Ngày tải lên: 28/10/2013, 16:15

... accCommand.Connection = logForm.accConnection; accCommand.CommandType = CommandType.StoredProcedure; accCommand.CommandText = cmdString; accCommand.Parameters.Add("FacultyName", ... inCollege IN VARCHAR2, inTitle IN VARCHAR2, inEmail IN VARCHAR2, FacultyName IN VARCHAR2) AS begin UPDATE Faculty SET faculty_name=inName, office=inOffice, phone=inPhone, college=inCollege, ... the codes that are shown below under the code body of the stored procedure: create or replace PROCEDURE UpdateFaculty_SP (inName IN VARCHAR2, inOffice IN VARCHAR2, inPhone IN CHAR, inCollege...

Ngày tải lên: 28/10/2013, 16:15