C# 附加数据库

近段时间学习了如何用安装包将数据库一起附加进去，代替了以往需要用户手工附加的方式。

/// <summary>
    /// 数据库操作控制类
    /// </summary>
     public class DataBaseControl
     {
         /// <summary>
         /// 数据库连接字符串
         /// </summary>
         public string ConnectionString;

         /// <summary>
         /// SQL操作语句/存储过程
         /// </summary>
        public string StrSQL;

         /// <summary>
         /// 实例化一个数据库连接对象
         /// </summary>
         private SqlConnection Conn;

         /// <summary>
         /// 实例化一个新的数据库操作对象Comm
         /// </summary>
         private SqlCommand Comm;

         /// <summary>
         /// 要操作的数据库名称
         /// </summary>
         public string DataBaseName;

         /// <summary>
         /// 数据库文件完整地址
         /// </summary>
         public string DataBase_MDF;

         /// <summary>
         /// 数据库日志文件完整地址
         /// </summary>
         public string DataBase_LDF;

         /// <summary>
         /// 备份文件名
         /// </summary>
         public string DataBaseOfBackupName;

         /// <summary>
         /// 备份文件路径
         /// </summary>
         public string DataBaseOfBackupPath;

         /// <summary>
         /// 执行创建/修改数据库和表的操作
         /// </summary>
         public void DataBaseAndTableControl()
         {
             try
             {
                 Conn = new SqlConnection(ConnectionString);
                 Conn.Open();

                 Comm = new SqlCommand();
                 Comm.Connection = Conn;
                 Comm.CommandText = StrSQL;
                 Comm.CommandType = CommandType.Text;
                 Comm.ExecuteNonQuery();

                MessageBox.Show("数据库操作成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
             catch (Exception ex)
             {
                MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
             finally
             {
                Conn.Close();
             }
        }

         /// <summary>
         /// 附加数据库
         /// </summary>
         public void AddDataBase()
         {
             try
             {
                 Conn = new SqlConnection(ConnectionString);
                 Conn.Open();

                 Comm = new SqlCommand();
                 Comm.Connection = Conn;
                 Comm.CommandText = @"sp_attach_db";

                 Comm.Parameters.Add(new SqlParameter(@"dbname", SqlDbType.NVarChar));
                 Comm.Parameters[@"dbname"].Value = DataBaseName;
                 Comm.Parameters.Add(new SqlParameter(@"filename1", SqlDbType.NVarChar));
                 Comm.Parameters[@"filename1"].Value = DataBase_MDF;
                 Comm.Parameters.Add(new SqlParameter(@"filename2", SqlDbType.NVarChar));
                 Comm.Parameters[@"filename2"].Value = DataBase_LDF;

Comm.CommandType = CommandType.StoredProcedure; //此处一定要用存储过程，还有我也认识到存储过程的参数的写法不同与SQL语句。在查询分析器中写附加数据库的语法为exec sp_attach_db @dbname=N'数据库名',@filename1=N'MDF文件路径',@filename2=N'LDF文件路径',按照我的推测，存储过程方式添加参数后它的值直接跟在后面了。
Comm.ExecuteNonQuery();

                MessageBox.Show("附加数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
             catch (Exception ex)
             {
                MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
             finally
             {
                Conn.Close();
             }
        }

         /// <summary>
         /// 分离数据库
         /// </summary>
         public void DeleteDataBase()
         {
             try
             {
             Conn = new SqlConnection(ConnectionString);
             Conn.Open();

             Comm = new SqlCommand();
             Comm.Connection = Conn;
             Comm.CommandText = "sp_detach_db";

Comm.Parameters.Add(new SqlParameter(@"dbname", SqlDbType.NVarChar));
Comm.Parameters[@"dbname"].Value = DataBaseName;

Comm.CommandType = CommandType.StoredProcedure;
Comm.ExecuteNonQuery();

             MessageBox.Show("分离数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
             catch (Exception ex)
             {
             MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
             }
             finally
             {
             Conn.Close();
             }
        }

/// <summary>
/// 备份数据库
/// </summary>
public void BackupDataBase()
{
try
{
Conn = new SqlConnection(ConnectionString);
Conn.Open();

Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = "use master;backup database @dbname to disk = @backupname;";

//这里添加参数的方式就跟我以前的做法一样，只不过他加了@,我认识加@是个好习惯，防止特殊字符被转义，我以后也采用这种方式。

Comm.CommandType = CommandType.Text;
Comm.ExecuteNonQuery();

MessageBox.Show("备份数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}

/// <summary>
/// 还原数据库
/// </summary>
public void ReplaceDataBase()
{
try
{
string BackupFile = @DataBaseOfBackupPath + @DataBaseOfBackupName;
Conn = new SqlConnection(ConnectionString);
Conn.Open();

Comm = new SqlCommand();
Comm.Connection = Conn;
Comm.CommandText = "use master;restore database @DataBaseName From disk = @BackupFile with replace;";

Comm.Parameters.Add(new SqlParameter(@"DataBaseName", SqlDbType.NVarChar));
Comm.Parameters[@"DataBaseName"].Value = DataBaseName;
Comm.Parameters.Add(new SqlParameter(@"BackupFile", SqlDbType.NVarChar));
Comm.Parameters[@"BackupFile"].Value = BackupFile;

Comm.CommandType = CommandType.Text;
Comm.ExecuteNonQuery();

MessageBox.Show("还原数据库成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message, "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
finally
{
Conn.Close();
}
}
}

有了这些方法，我就可以在我的安装类中附加数据库了。接下来我要学习一下如何让用户安装时有下拉框选择。

测试代码如下：

private void btnAttach_Click(object sender, EventArgs e)
        {
            DataBaseControl DBC = new DataBaseControl();
            DBC.ConnectionString = "Data Source=(local);User id=用户名;Password=密码; Initial Catalog=master";
            DBC.DataBaseName = "LabelLive";
            DBC.DataBase_MDF = @"C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\LabelLive.MDF";
            DBC.DataBase_LDF = @"C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\LabelLive_Log.LDF";
            DBC.AddDataBase();

}

        private void btnDetach_Click(object sender, EventArgs e)
        {
            DataBaseControl DBC = new DataBaseControl();
            DBC.ConnectionString = "Data Source=(local);User id=用户名;Password=密码; Initial Catalog=master";
            DBC.DataBaseName = "LabelLive";
            DBC.DeleteDataBase();
        }

        private void btnBackup_Click(object sender, EventArgs e)
        {
            DataBaseControl DBC = new DataBaseControl();
            DBC.ConnectionString = "Data Source=(local);User id=用户名;Password=密码; Initial Catalog=master";
            DBC.DataBaseName = "LabelLive";
            DBC.DataBaseOfBackupName = @"LabelLive.bak";
            DBC.DataBaseOfBackupPath = @"D:\";
            DBC.BackupDataBase();
        }

private void btnRestore_Click(object sender, EventArgs e)
        {
            DataBaseControl DBC = new DataBaseControl();
            DBC.ConnectionString = "Data Source=(local);User id=用户名;Password=密码; Initial Catalog=master";
            DBC.DataBaseName = "LabelLive";
            DBC.DataBaseOfBackupName = @"LabelLive.bak";
            DBC.DataBaseOfBackupPath = @"D:\";
            DBC.ReplaceDataBase();
        }