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using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
/// <summary>
/// Class contains generic data access functionality to be accessed from
/// the business tier
/// </summary>
public static class GenericDataAccess
{
public static string username = "sa", password = "admin", database = "tx";
// static constructor
static GenericDataAccess()
{
//
// TODO: Add constructor logic here
//
}
// execute a command and return the results as a DataTable object
public static DataTable ExecuteSelectCommand(SqlCommand command)
{
// The DataTable to be returned
DataTable table;
// Execute the command making sure the connection gets closed in the end
try
{
// Open the data connection
command.Connection.Open();
// Execute the command and save the results in a DataTable
SqlDataReader reader = command.ExecuteReader();
table = new DataTable();
table.Load(reader);
// Close the reader
reader.Close();
}
catch (Exception ex)
{
throw ex;
}
finally
{
// Close the connection
command.Connection.Close();
}
return table;
}
// execute an update, delete, or insert command
// and return the number of affected rows
public static int ExecuteNonQuery(SqlCommand command)
{
// The number of affected rows
int affectedRows = -1;
// Execute the command making sure the connection gets closed in the end
try
{
// Open the connection of the command
command.Connection.Open();
// Execute the command and get the number of affected rows
affectedRows = command.ExecuteNonQuery();
}
catch (Exception ex)
{
// Log eventual errors and rethrow them
throw ex;
}
finally
{
// Close the connection
command.Connection.Close();
}
// return the number of affected rows
return affectedRows;
}
// execute a select command and return a single result as a string
public static string ExecuteScalar(SqlCommand command)
{
// The value to be returned
string value = "";
// Execute the command making sure the connection gets closed in the end
try
{
// Open the connection of the command
command.Connection.Open();
// Execute the command and get the number of affected rows
value = command.ExecuteScalar().ToString();
}
catch (Exception ex)
{
// Log eventual errors and rethrow them
throw ex;
}
finally
{
// Close the connection
command.Connection.Close();
}
// return the result
return value;
}
// creates and prepares a new SqlCommand object on a new connection
public static SqlCommand CreateCommand()
{
try
{
// Obtain the database provider name
//string dataProviderName = "System.Data.SqlClient";
// Obtain the database connection string
string connectionString = string.Format("Server=server;Database={0};password ={1};user={2}", database, password, username);
// Create a new data provider factory
//DbProviderFactory factory = DbProviderFactories.GetFactory(dataProviderName);
// Obtain a database specific connection object
SqlConnection conn = new SqlConnection(connectionString);//= factory.CreateConnection();
// Set the connection string
//conn.ConnectionString = connectionString;
// Create a database specific command object
SqlCommand comm = conn.CreateCommand();
// Set the command type to stored procedure
comm.CommandType = CommandType.StoredProcedure;
// Return the initialized command object
return comm;
}
catch (Exception ex)
{
return null;
}
}
}
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