init

PhoneBook.sln

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+
+Microsoft Visual Studio Solution File, Format Version 11.00
+# Visual Studio 2010
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "PhoneBook", "PhoneBook\PhoneBook.csproj", "{71F1CFEC-1E1F-4AE8-8BD4-F652ABD0492C}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|x86 = Debug|x86
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{71F1CFEC-1E1F-4AE8-8BD4-F652ABD0492C}.Debug|x86.ActiveCfg = Debug|x86
+		{71F1CFEC-1E1F-4AE8-8BD4-F652ABD0492C}.Debug|x86.Build.0 = Debug|x86
+		{71F1CFEC-1E1F-4AE8-8BD4-F652ABD0492C}.Release|x86.ActiveCfg = Release|x86
+		{71F1CFEC-1E1F-4AE8-8BD4-F652ABD0492C}.Release|x86.Build.0 = Release|x86
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

PhoneBook/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+  <configSections>
+  </configSections>
+  <appSettings>
+    <add key="searchBarToolStripMenuItem.Checked" value="true"/>
+    <add key="copyOnClickToolStripMenuItem.Checked" value="false"/>
+    <add key="disablePromptToolStripMenuItem.Checked" value="true"/>
+  </appSettings>
+  <connectionStrings>
+    <add name="PhoneBook.Properties.Settings.ContactsDBConnectionString"
+      connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\accdb\ContactsDB.accdb"
+      providerName="System.Data.OleDb" />
+  </connectionStrings>
+</configuration>

PhoneBook/ContactsDBDataSet.xsc

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+

PhoneBook/ContactsDBDataSet.xss

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+

PhoneBook/DBMngProxy.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Data;
+using System.Data.OleDb;
+using System.IO;
+
+namespace PhoneBook
+{
+
+	// This class is a static container class for the interface needs in order to connect with the database
+	public static class DBMngProxy
+	{
+
+		/* Contacts Database string
+        *private static OleDbConnection contactsDBConn, used to connect
+        *ACCDB 2013 connection string
+         */
+		private static OleDbConnection contactsDBConn = new OleDbConnection();
+
+		// Retrieve the path of the database file name, using the ConnectionString
+		private static string GetDatabasePath()
+		{
+			// to null reference or out of bounds
+			if (ConnectionString != null && ConnectionString != string.Empty)
+			{
+				return ConnectionString.Substring(ConnectionString.IndexOf("=", ConnectionString.IndexOf("Source=")) + 1);
+			}
+			return string.Empty;
+		}
+
+		// public interface for checking about the database existing
+		public static bool DatabaseFileExists()
+		{
+			return File.Exists(GetDatabasePath());
+		}
+
+		// CennctionString get and set
+		public static string ConnectionString
+		{
+			get
+			{
+				return DBMngProxy.contactsDBConn.ConnectionString;
+			}
+			set
+			{
+				DBMngProxy.contactsDBConn.ConnectionString = value;
+			}
+		}
+
+		// Remove contact by id and return how many rows were affected
+		public static int RemoveContact(int id)
+		{
+			return ExecuteNonQuery(String.Format("DELETE FROM ContactsTable Where id={0}", id));
+		}
+
+		// Remove all the contacts from ContactsTable
+		public static int RemoveAllContacts()
+		{
+			return ExecuteNonQuery("DELETE FROM ContactsTable");
+		}
+
+		// Insert new contact into the database with the details from the declaration, the method returns the number of affected rows
+		public static int InsertNewContact(string firstName, string lastName, string phoneNumber, string gender)
+		{
+			return ExecuteNonQuery(String.Format("INSERT INTO ContactsTable (firstName, lastName, phoneNumber, gender) VALUES ('{0}','{1}','{2}','{3}')",
+				firstName, lastName, phoneNumber, gender));
+
+		}
+
+		// Update existing contact to the details from the declaration, the method returns the number of affected rows
+		public static int UpdateContact(string firstName, string lastName, string phoneNumber, string gender, int id)
+		{
+			return ExecuteNonQuery(string.Format("UPDATE ContactsTable SET firstName='{0}', lastName='{1}', phoneNumber='{2}', gender='{3}' WHERE id={4}",
+				firstName, lastName, phoneNumber, gender, id));
+		}
+
+		/* The method is checking whether an existing contact have this phone number already, the purpose of the method is to
+         * avoid duplications of phone numbers
+         * the method return the id if found the same phone number or -1 in other case
+         */
+		public static int PhoneNumberExists(string phoneNumber)
+		{
+			int id = -1; // default state is not found
+			OleDbCommand oleDbCmd;
+			try
+			{
+				contactsDBConn.Open(); // start connection				   
+				oleDbCmd = new OleDbCommand("SELECT * FROM ContactsTable WHERE phoneNumber='" + phoneNumber + "'", contactsDBConn); // sql query
+				if (oleDbCmd != null)
+				{
+					OleDbDataReader dr = oleDbCmd.ExecuteReader();
+					if (dr != null)
+					{
+						dr.Read(); // moving to first row if available
+						if (dr.HasRows)
+						{
+							id = Convert.ToInt32(dr["id"]);
+						}
+					}
+				}
+				contactsDBConn.Close(); //connection close
+				return id;
+			}
+			catch (Exception e)
+			{
+				// if something wen wrong Exception will be thrown
+				contactsDBConn.Close();
+				throw new Exception("An error occured", e);
+			}
+		}
+
+		// This is help method for executing non query sql commands, "sqlCmd" is the requaierd command, the method returns the number of affected rows
+		private static int ExecuteNonQuery(string sqlCmd)
+		{
+			OleDbCommand oleDbCmd;
+			try
+			{
+				int affectedRows; // prepare int for affected rows
+				contactsDBConn.Open(); // start connection
+				oleDbCmd = new OleDbCommand(sqlCmd, contactsDBConn);
+				affectedRows = oleDbCmd.ExecuteNonQuery(); // execute the sql command
+				contactsDBConn.Close(); // connection close
+				return affectedRows;
+			}
+			catch (Exception e)
+			{
+				// if something wen wrong Exception will be thrown
+				throw new InvalidOperationException("Data could not be read, try again later", e);
+			}
+		}
+	}
+}