C Operation Method of Establishing Database and Attaching Database

This paper describes the operation method of creating database and attaching database by C #. Share it for your reference, as follows:

/// <summary>
///  Attached database method 
/// </summary>
/// <param name="strSql"> Connection database string, connection master System database </param>
/// <param name="DataName"> Database name </param>
/// <param name="strMdf"> Database file MDF Path of </param>
/// <param name="strLdf"> Database file LDF Path of </param>
/// <param name="path"> Installation directory </param>
private  void CreateDataBase( string strSql, string DataName, string strMdf, string strLdf, string path)
{
  SqlConnection myConn = new SqlConnection(strSql);
  String str = null ;
  try
  {
   str = " EXEC sp_attach_db @dbname='"+DataName+"',@filename1='"+strMdf+"',@filename2='"+strLdf+"'";
   SqlCommand myCommand = new SqlCommand(str, myConn);
   myConn.Open();
   myCommand.ExecuteNonQuery();
   MessageBox.Show(" The database was installed successfully! Click OK to continue ");// Need Using System.Windows.Forms
  }
  catch(Exception e)
  {
   MessageBox.Show(" Database installation failed! " + e.Message+"\n\n"+" You can attach data manually ");
   System.Diagnostics.Process.Start(path);// Open the installation directory 
  }
  finally
  {
   myConn.Close();
  }
}
public override void Install(System.Collections.IDictionary stateSaver)
{
  string server = this.Context.Parameters["server"];// Server name 
  string uid = this.Context.Parameters["user"];//SQlServer User name 
  string pwd = this.Context.Parameters["pwd"];// Password 
  string path = this.Context.Parameters["targetdir"];// Installation directory 
  string strSql = "server=" + server + ";uid=" + uid + ";pwd=" + pwd + ";database=master";// Connection database string 
  string DataName = "JXC";// Database name 
  string strMdf = path + @"JXC.mdf";//MDF File path, please note that the file name should be the same as the database file name just added 1 Sample! 
  string strLdf = path + @"jxc_log.ldf";//LDF File path 
  base.Install(stateSaver);
  this.CreateDataBase(strSql, DataName, strMdf, strLdf, path);// Start creating a database 
}
/// <summary>
///  Test connection 
/// </summary>
/// <param name="serverName"></param>
/// <param name="dbName"></param>
/// <param name="userName"></param>
/// <param name="password"></param>
private SqlConnection TestConnection(string serverName, string dbName, string userName, string password)
{
    string connectionString = GetConnectionString(serverName, dbName, userName, password);
    SqlConnection connection = new SqlConnection(connectionString);
    try
    {
      if (connection.State != ConnectionState.Open)
      {
        connection.Open();
      }
      return connection;
    }
    catch
    {
      CloseConnection(connection);
      throw new InstallException(" Installation failed !\n Error in database configuration , Please configure the information correctly! ");
    }
}
/// <summary>
///  Get the connection string 
/// </summary>
/// <param name="serverName"></param>
/// <param name="dbName"></param>
/// <param name="userName"></param>
/// <param name="password"></param>
/// <returns></returns>
private string GetConnectionString(string serverName, string dbName, string userName, string password)
{
    string connectionString = "Data Source={0};Initial Catalog={1};User ID={2};Password={3}";
    connectionString = string.Format(connectionString, serverName, dbName, userName, password);
    return connectionString;
}
/// <summary>
///  Create a database 
/// </summary>
/// <param name="serverName"></param>
/// <param name="dbName"></param>
/// <param name="userName"></param>
/// <param name="password"></param>
/// <param name="connection"></param>
/// <param name="stateSaver"></param>
public int CreateDataBase(SqlConnection connection)
{
    int result = -1;
    connection.ChangeDatabase("master");
    string createDBSql = @" if Exists(select 1 from sysdatabases where [name]=N'{0}')
        begin
        drop database {0}
        end
        GO
        CREATE DATABASE {0} ";
    createDBSql = string.Format(createDBSql, _dbName);
    // Because there are Go In SQLCommand I don't know each other, so I use Go For the separator sql Statement 
    char[] split = new char[] { 'G', 'O' };
    string[] sqlList = createDBSql.Split(split);
    SqlCommand command = null;
    try
    {
      command = connection.CreateCommand();
      command.CommandType = System.Data.CommandType.Text;
      foreach (string sqlItem in sqlList)
      {
        if (sqlItem.Length > 2)
        {
          command.CommandText = sqlItem;
          result = command.ExecuteNonQuery();
        }
      }
      return result;
    }
    catch
    {
      CloseConnection(connection);
      command.Dispose();
      throw new InstallException(" Installation failed !\n Incorrect database configuration !");
    }
}
/// <summary>
///  Separation SQL Statement 
/// </summary>
/// <param name="sql"></param>
/// <returns></returns>
private string[] splitSql(string sql)
{
    Regex regex = new Regex("^GO", RegexOptions.IgnoreCase | RegexOptions.Multiline);
    string[] sqlList = regex.Split(sql.ToUpper());
    return sqlList;
}

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