Database Applications

Transcription

1 Database Applications Pemrograman Visual (TH22012 ) by Kartika Firdausy kartikaf@indosat.net.id kartika@ee.uad.ac.id blog.uad.ac.id/kartikaf kartikaf.wordpress.com Introduction A database is a list or a group of lists of objects organized to make the list(s) and its (their) values easy to create and manage. In the computer world, this suggests, rightly, that the list(s) and its(their) values are stored in a machine. As information becomes of high importance, almost every company keeps some type of database, whether it includes its employees, its customers, or the products it sells. 1

2 Introduction To make it possible to create computer databases, throughout its history, Microsoft developed various libraries and programming environments. Microsoft ActiveX Data Objects or ADO, is a library used to manage databases. Microsoft ActiveX Data Object Extensions for Data Definition Language and Security abbreviated ADOX, is an addition to ADO. It can be used to create and manage a database, providing some of the same operations as ADO but also some operations not possible in ADO. Database Creation To get a database, you can either use one that exists already or you can create your own. ADO by itself doesn't provide the means to create a database. To create one, you can use the Microsoft ActiveX Data Objects Extensions for Data Definition Language and Security, abbreviated ADOX. Before using ADOX, you must reference it in your Microsoft Visual C++ project. 2

3 Database Creation To do this, on the main menu of Visual C++ Express, you can click Project -> References... As an alternative, in the Solution Explorer, right-click the name of the project and click References... Database Creation In the Property Pages, click Add New References 3

4 Database Creation In the COM tab of the Add Reference dialog box, locate the Microsoft ADO Ext. 2.7 or 2.8 for DDL and Security: Click OK. ADO Fundamentals The.NET Framework is a library, developed by Microsoft, that can be used to create different types of applications, including databases. The.NET Framework comes with a technique of creating and managing databases known ADO.NET. Although ADO is a true library, ADO.NET is not a library: it is only a technique of dealing with databases. The ADO part suggests that it uses concepts similar to the ADO approach of solving database operations. The.NET part of the name means that it uses the.net Framework. In the.net Framework, ADO is represented by the ADODB namespace. The classes used to create and manage tables are stored in the ADODB namespace. 4

5 The Data Source of an Application A database is a project that holds one or more lists of items. There can be other issues involved such as how the data would be made available to the users, what computer(s) would access the data, what types of users would access the database. The database could reside in one computer and used by one person. A database can also be stored in one computer but accessed by different computers in a network. Another database can be created and stored in a server to be accessed through the Internet. These and other related scenarios should be dealt with to create and distribute the database. A Data Source You may plan to create a database that would be used by one person using one computer. As your job becomes more effective, you could be asked to create another database that would be accessed by different people. Regardless of why and how, after creating a database, you should have a way of making it available to those who would use it. To do this, you can create a data source. 5

6 A Data Source A database is created as a computer file and it has a path, that is, where the database file is located. The path to a file is also known as its location. The path to a database, including its name, is also called the data source. In some of your database operations, you will be asked to provide a data source for your database. In this case, provide the complete path followed by the name of the database. A Data Source If you plan to access your database from another programming environment, then you should create an ODBC data source. In the Control Panel or the Administrative Tools, double-click Data Source (ODBC) to open the ODBC Data Source Administrator To proceed, click the Add button. 6

7 A Data Source In the Create New Data Source wizard, click Microsoft Access Driver (*.mdb) click Finish A Data Source Enter a name for the data source. In the Description text box, you can enter a short sentence anyway you like. To specify the database that would be used, click Select and select an mdb database. Here is an example: 7

8 A Data Source Here is an example: A Data Source To specify the database that would be created, click Create. Here is an example: 8

9 A Data Source Here is an example: A Data Source Here is an example: 9

10 A Data Source if you need to be authenticated in order to use the database (if the database is protected), click the Advanced button. A Data Source By default, a database is meant to allow anybody to use it. In this case, you can leave the Login Name and the Password empty. Otherwise, type the necessary credentials: 10

11 Data Records A table was made of one or various columns that represent categories of data. After creating such a table and its columns that represent the categories, you (actually the user) can enter values in the table to make it a valuable list. Filling up a table with values is referred to as data entry. Data entry is performed by entering a value under the column headers. The group of values that correspond to the same entry or the same line under the columns is called a record. This also means that the records are entered one line, also called a row, at a time A record on a table is represented as a row (horizontal) of data. Data Records Start Microsoft Visual Studio.NET and create a new Windows Forms Application in the Toolbox click DataSet 11

12 Data Records In the Add Dataset dialog box, click the Untyped Dataset radio button click OK Data Records While the DataSet control is still selected, in the Properties window, click (Name) and type dsmahasiswa set the DataSetName to Mahasiswa 12

13 Data Records While the DataSet control is still selected, in the Properties window, click Tables and click button Tables Collection Editor click Add button Data Records Tables Collection Editor in the Properties window, click (Name) and type tblpersons set the TableName to Persons 13

14 Data Records in the Persons Properties window, click Columns and click button Tables Collection Editor click Add button Data Records Columns Collection Editor click Add button, in the Properties window, click (Name) and type colnama set the ColumnName to Nama 14

15 Data Records Toolbox ListView, in the Properties window, click (Name) and type lvwpeople set the AllowColumnReorder to True Data Records Toolbox Button in the Properties window, click (Name) and type btnclose set the Anchor to Bottom, Right 15

16 Data Records While the ListView lvwpeople is still selected, in the Properties window, click View and type Details Data Records ColumnHeader Collection Editor Properties window click (Name) and type Alamat set the Text to Alamat Width

17 Data Records Double-click the Tutup button and implement its Click event as follows: private: System::Void btnclose_click(system::object * sender, System::EventArgs * e) } { Close(); References datarow.htm 17