Added a DBConnector class

This was a class I wrote few weeks back, when I was trying to create a
DBConnectionFactory. Most of the code in the class has been gleaned from
various sources on the internet.

TrackMyQuery/CXPacketTrackingForm.cs

@@ -1,15 +1,9 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.Data.SqlClient;
 using System.Diagnostics;
-using System.Threading;
 
 namespace TrackMyQuery
 {

TrackMyQuery/DbConnector.cs

@@ -0,0 +1,245 @@
+using System;
+using System.Data;
+using System.Data.Common;
+using System.Data.Odbc;
+using System.Data.OleDb;
+using System.Data.SqlClient;
+using System.Diagnostics;
+using System.IO;
+
+//@sqlchow: This class is a sum of all the research I was doing on creating a dbconnection factory.
+
+namespace TrackMyQuery
+{
+    class DbConnector : IDisposable
+    {
+        private string strConnectionString;
+        private DbConnection dbConnection;
+        private DbCommand dbCommand;
+        private DbProviderFactory dbFactory = null;
+        private bool boolHandleErrors;
+        private string strLastError;
+        private bool boolLogError;
+        private string strLogFile;
+
+        public DbConnector(string connectionstring, Providers provider)
+        {
+            strConnectionString = connectionstring;
+            switch (provider)
+            {
+                case Providers.SqlServer:
+                    dbFactory = SqlClientFactory.Instance;
+                    break;
+                case Providers.OleDb:
+                    dbFactory = OleDbFactory.Instance;
+                    break;
+                case Providers.ODBC:
+                    dbFactory = OdbcFactory.Instance;
+                    break;
+            }
+
+            dbConnection = dbFactory.CreateConnection();
+            dbCommand = dbFactory.CreateCommand();
+
+            dbConnection.ConnectionString = strConnectionString;
+            dbCommand.Connection = dbConnection;
+        }
+
+        public DbConnector(string strConnectionString)
+            : this(strConnectionString, Providers.SqlServer)
+        {
+        }
+
+        public bool HandleErrors
+        {
+            get { return boolHandleErrors; }
+            set { boolHandleErrors = value; }
+        }
+
+        public string LastError
+        {
+            get { return strLastError; }
+        }
+
+        public bool LogErrors
+        {
+            get { return boolLogError; }
+            set { boolLogError = value; }
+        }
+
+        public string LogFile
+        {
+            get { return strLogFile; }
+            set { strLogFile = value; }
+        }
+
+        public int AddParameter(string name, object value)
+        {
+            DbParameter dbParam = dbFactory.CreateParameter();
+            dbParam.ParameterName = name;
+            dbParam.Value = value;
+
+            return dbCommand.Parameters.Add(dbParam);
+        }
+
+        public int AddParameter(DbParameter dbParam)
+        {
+            return dbCommand.Parameters.Add(dbParam);
+        }
+
+        public DbCommand Command
+        {
+            get { return dbCommand; }
+        }
+
+        public DbDataReader ExecuteReader(string dbQuery, CommandType dbCommandType, ConnectionState dbConnectionState)
+        {
+            DbDataReader dbReader = null;
+
+            dbCommand.CommandText = dbQuery;
+            dbCommand.CommandType = dbCommandType;
+
+            try
+            {
+                if (dbConnection.State == System.Data.ConnectionState.Closed)
+                {
+                    dbConnection.Open();
+                }
+
+                if (dbConnectionState == ConnectionState.CloseOnExit)
+                {
+                    dbReader = dbCommand.ExecuteReader(CommandBehavior.CloseConnection);
+                }
+                else
+                {
+                    dbReader = dbCommand.ExecuteReader();
+                }
+            }
+            catch (Exception ex)
+            {
+                HandleExceptions(ex);
+            }
+            finally
+            {
+                dbCommand.Parameters.Clear();
+            }
+
+            return dbReader;
+        }
+
+
+        public DataSet ExecuteDataSet(string dbQuery, CommandType dbCommandType, ConnectionState dbConnectionState)
+        {
+            DataSet dbDataSet = new DataSet();
+            DbDataAdapter dbAdapter = dbFactory.CreateDataAdapter();
+
+            dbCommand.CommandText = dbQuery;
+            dbCommand.CommandType = dbCommandType;
+            dbAdapter.SelectCommand = dbCommand;
+
+            try
+            {
+                dbAdapter.Fill(dbDataSet);
+            }
+            catch (Exception ex)
+            {
+                HandleExceptions(ex);
+            }
+            finally
+            {
+                dbCommand.Parameters.Clear();
+                if (dbConnectionState == ConnectionState.CloseOnExit)
+                {
+                    if (dbConnection.State == System.Data.ConnectionState.Open)
+                    {
+                        dbConnection.Close();
+                    }
+                }
+            }
+
+            return dbDataSet;
+        }
+
+        public object ExecuteScalar(string dbQuery, CommandType dbCommandType, ConnectionState dbConnectionState)
+        {
+            dbCommand.CommandText = dbQuery;
+            dbCommand.CommandType = dbCommandType;
+            object returnObj = null;
+            try
+            {
+                if (dbConnection.State == System.Data.ConnectionState.Closed)
+                {
+                    dbConnection.Open();
+                }
+                returnObj = dbCommand.ExecuteScalar();
+            }
+            catch (Exception ex)
+            {
+                HandleExceptions(ex);
+            }
+            finally
+            {
+                dbCommand.Parameters.Clear();
+                if (dbConnectionState == ConnectionState.CloseOnExit)
+                {
+                    dbConnection.Close();
+                }
+            }
+
+            return returnObj;
+        }
+
+        private void HandleExceptions(Exception ex)
+        {
+            StackFrame exStack = new StackTrace(ex, true).GetFrame(0);
+            string exceptionMethod = exStack.GetMethod().Name;
+            string exceptionLine = exStack.GetFileLineNumber().ToString();
+            string exSource = string.Format("Exception raised in {0} at line number: {1}", exceptionMethod, exceptionLine);
+
+            if (LogErrors)
+            {
+                WriteToLog(exceptionMethod, exceptionLine, ex.Message);
+            }
+
+            if (HandleErrors)
+            {
+                strLastError = exSource + "\n" + ex.Message;
+            }
+            else
+            {
+                throw ex;
+            }
+        }
+
+        private void WriteToLog(string methodName, string lineNumber, string message)
+        {
+            StreamWriter logWriter = File.AppendText(LogFile);
+            logWriter.WriteLine(DateTime.Now.ToString() + " - [" + methodName + ":" + lineNumber + "] - " + message);
+            logWriter.Close();
+        }
+
+        private void WriteToLog(string message)
+        {
+            StreamWriter logWriter = File.AppendText(LogFile);
+            logWriter.WriteLine(DateTime.Now.ToString() + " - " + message);
+            logWriter.Close();
+        }
+
+        public void Dispose()
+        {
+            dbCommand.Dispose();
+            dbConnection.Close();
+            dbConnection.Dispose();
+        }
+    }
+
+    public enum Providers
+    {
+        SqlServer, ODBC, OleDb
+    }
+
+    public enum ConnectionState
+    {
+        KeepOpen, CloseOnExit
+    }
+}

TrackMyQuery/MainMenuForm.cs

@@ -1,11 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.Data.SqlClient;
 

TrackMyQuery/QueryProfilesTrackingForm.cs

@@ -1,15 +1,9 @@
 using System;
 using System.Collections.Generic;
-using System.ComponentModel;
-using System.Data;
-using System.Drawing;
-using System.Linq;
 using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using System.Data.SqlClient;
 using System.Diagnostics;
-using System.Threading;
 
 namespace TrackMyQuery
 {

TrackMyQuery/TrackMyQuery.csproj

@@ -65,6 +65,7 @@
     <Compile Include="CXPacketTrackingForm.Designer.cs">
       <DependentUpon>CXPacketTrackingForm.cs</DependentUpon>
     </Compile>
+    <Compile Include="DbConnector.cs" />
     <Compile Include="MainMenuForm.cs">
       <SubType>Form</SubType>
     </Compile>