Murat ÇELİKADAMQuerying Information in a Database

CONTENTSRelational Database SystemsCreating Database with SQL ServerReading Data with LINQRequirements to Get Data From Database

Step by StepWriting Data to on DataBase SummaryExamplesQuestions

Relational Database Systems Oracle FoxPro IBM DB2 Linter Microsoft Access Microsoft SQLServer MySQL PostgreSQL  SQLite

Creating Database with MySQL

Creating Database with MySQL

Creating Database with MySQL

Creating Database with MySQL

Creating Database with MySQL

Reading Data with LINQ

Reading Data with LINQ

Reading Data with LINQ

Reading Data with LINQ

Requirements to Get Data From Database Step by StepAdding Namespace Creating Connection and Opening itDetermine the SqlDataAdapterReading DataClosing Connection

Adding NamespaceSystem.Data.SqlClient (the.NET Framework

Data Provider for SQL Server)System.Data.Odbc (the.NET Framework Data

Provider for ODBC)System.Data.OracleClient (the .NET

Framework Data Provider for Oracle)System.Data.OleDb (the.NET Framework

Data Provider for OLE DB)

ConnectionThe Connection Object is a part

of ADO.NET Data Provider and it is a unique session with the Data Source

The Connection Object is Handling the part of physical communication between the C# application and the Data Source

Opening connection is like opening a folder

ConnectionSqlConnection conn = new SqlConnection();Con.ConnectionString = @“…”;Con.Open();

SqlDataAdapterA data adapter is an object used to exchange

data between a data source and a data set

SqlDataAdapterSqlDataAdapter adapter = new SqlDataAdapter(command); DataTable datatable = new DataTable(); adapter.Fill(datatable);

Reading Data and Closing ConnectionDataGridView displays data from SQL

databases. This tutorial shows how to display a specific

table from a database and display it on a DataGridView.

This is done with a DataAdapter

DataGridView.DataSource = DataTable;Conn.Close(); //Important to close connection

Writing Data to on DataBase Use SqlCommand Use ExecuteNonQuery

string Kmt = "INSERT INTO Customers (CustomerID,CompanyName,ContactName,City) VALUES ('" + textBox1.Text + "','" + textBox2.Text + "', …) ";

SqlCommand komut = new SqlCommand(Kmt, baglanti);

komut.ExecuteNonQuery();