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JDS VB Skill Session

TOPICS. Visual Studio .NETVB.NET Code StructureVB.NET Language BasicsData Access in .NET. What is .NET ?. Microsoft

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JDS VB Skill Session

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    1. JDS VB.NET Skill Session Fall 2004 Presented by YUHAO LIN

    2. TOPICS Visual Studio .NET VB.NET Code Structure VB.NET Language Basics Data Access in .NET

    3. What is .NET ? Microsoft .NET (released 2001) is Microsofts new generation "software platform." It's a language-neutral environment for writing programs Program in any language, run on one operating system Includes comprehensive class libraries that provide rich features

    4. What is VB.NET ? Visual Basic .NET Next generation of Visual Basic A programming language in the .NET framework Fully object-oriented

    5. Visual Studio .NET Available in Software Lab Latest version: 2003 Integrated Development Environment (IDE) for developing .NET applications

    6. Visual Studio .NET Create a new project Opening an existing project Open .sln file Solution Explorer (design vs code view) Properties Window Toolbox: many Controls Task List

    7. Visual Studio .NET Code view Comments #Regions: collapse Intellisense Run / compile Debug / step into Executable file Location: bin or obj subdirectory

    8. VB.NET Code Structure VB.NET Import statements Namespace Class Functions / Subs Properties Class variables

    9. VB.NET Code Structure VB.NET imports System.Data.OleDb namespace TestNamespace public class TestClass sub NewRecord() end sub function GetRecord() as String return strX end function End class end namespace

    10. VB.NET Language Case insensitive BUT, always be consistent !!!!! No semicolon to end statement One line per statement, & _ for multi-line statements: str1 = str2 &_ str1 = str2 & str3 str3 Very wordy, resembles English language Good for beginners

    11. Programming Review Car myCar = new Car(Ford, Escort) What did I do ??

    12. Common Data Types Integer Double Boolean String Array

    13. Data Conversion Convert.ToType(var); Ex: Convert.ToInt32(45) Convert.ToDateTime(12/31/2000) Ex: Dim j as integer Dim s as string = 16 If IsNumeric(s) Then check if s is a valid number J = Convert.ToInt32(s) convert s to 32-bit integer, assign to J End If

    14. Operators DESCRIPTION VB.NET Ex JAVA Ex String concatenation & str1 = str2 & str3 + str1 = str2 + str3 &= str1 &= str2 += str1 += str2 Addition += int1 += int2 += int1 += int2 Add 1 n/a int1 = int1 + 1 ++ int1++ Comparison >=, <= >=, <= Equality = If j = 1 == if (j == 1) Inequality Not If Not j = 1 ! if (j != 1) <> If j <> 1

    15. Methods

    16. Properties

    17. Loops Dim x as Integer = 0 Do While x < 5 x = x + 1 Loop

    18. Exception Handling Syntax: Try Catch var as Exception Finally End Try

    19. Database Access ADO.NET (ActiveX Data Objects) The .NET way to work with data Disconnected Architecture 2 Data Providers: SQL Server: specific provider for SQL Server Import System.Data.SqlClient OLEDB: everything else, basically Import System.Data.OleDb

    20. ADO.NET

    21. Data Access Components Connection string http://www.able-consulting.com/ADO_Conn.htm Connection object SQL statement Command Object & DataReader OR Data Adapter & DataSet

    22. Connection String SQL Server Data Provider: "Network Library=DBMSSOCN;Data Source=111.11.111.111,3333; & _ Initial Catalog=epics;User Id=epics;Password=jds" OLEDB Data Provider (SQL Server): "Provider=sqloledb;" & _ "Data Source=111.11.111.111,3333;" & _ "Initial Catalog=epics;" & _ "User Id=epics;" & _ "Password=jds" OLEDB Data Provider (Access): "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=T:\www\mdb\WebInt.mdb"

    23. DataSet vs DataReader DataReader Object to access data in a connected, forward-only, read-only fashion DataSet Data structure to store schema and data in a disconnected fashion Useful for editing data offline and later update to data source

    24. Database Connectivity Using SQL Server Data Provider and DataSet: Dim strConn as String = "Network Library=DBMSSOCN;Data Source=111.11.111.111,3333; & _ Initial Catalog=epics;User Id=epics;Password=jds Dim oConn as new SqlConnection(strConn) Dim strSQL as String = select * from NODE_PROFILE Dim oAdapter as new SqlDataAdapter(strSql, oConn) Dim ds as new DataSet oAdapter.Fill(ds, NODE_PROFILE) now we have a DataSet with data from the NODE_PROFILE table Using OLEDB Data Provider and DataReader: Dim strConn as String = "Provider=sqloledb;" & "Data Source=111.11.111.111,3333;" & _ "Initial Catalog=epics;" & "User Id=epics;" & "Password=jds Dim oConn as new OleDbConnection(strConn) Dim strSQL as string = select * from NODE_PROFILE Dim oCommand as New OleDbCommand(strSql, oConn) Dim oReader As OleDbDataReader oReader = oCommand.ExecuteReader() now we have a DataReader with data from the NODE_PROFILE table

    25. ADO.NET in JDS.2GO ?? Not taking advantage of .NET data providers and data structures Using outdated technology: objects from ADODB class This semester: possibly transform all of JDS.2GO to ADO.NET-standard

    26. ADO.NET Hands-on Exercise!!!!!!!!!!! Task: build a simple VB.NET application with database connectivity to display the front-end. Based on existing C# code

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