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SqlBackup.cs
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SqlBackup.cs
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/*
okarpov: oleksandr karpov, 2015
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
namespace RemoteToLocalSQLBackup
{
class SqlBackup : IDisposable
{
SqlConnection sqlConnection = null;
SqlCommand sqlCmd = null;
string tmpDBName = "TempoBak";
const string getDBSize = "USE [{0}] SELECT CAST(SUM(size) * 8 / 1024 AS BIGINT) FROM sys.database_files;";//"USE [{0}] SELECT CAST(SUM(size) * 8. / 1024 AS BIGINT) FROM sys.master_files WITH(NOWAIT) WHERE database_id = DB_ID() GROUP BY database_id";
const string createBakFiles1 = "BACKUP DATABASE [{0}] TO DISK = N'{0}{1}_tmp_1.bak'";
const string createBakFiles2 = " ,DISK = N'{0}{1}_tmp_{2}.bak'";
const string createBakFiles3 = " WITH NOFORMAT, NOINIT, NAME = N'{0}{1}-Full Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10";
const string getBackupPath = "SELECT TOP 1 physical_device_name FROM msdb.dbo.backupset b JOIN msdb.dbo.backupmediafamily m ON b.media_set_id = m.media_set_id WHERE database_name = '{0}' and backup_finish_date >=N'{1:yyyy-MM-dd}' and backup_finish_date < N'{2:yyyy-MM-dd}' ORDER BY backup_finish_date DESC";
//const string tempDB = "IF db_id('TempoBak') IS NULL begin create database TempoBak; end else begin use master; ALTER DATABASE TempoBak SET SINGLE_USER WITH ROLLBACK IMMEDIATE; drop database TempoBak; create database TempoBak; end use TempoBak; create table Temp (filename nvarchar(512), [file] varbinary(max)); use {0};";
const string tempDB = "IF db_id('{0}') IS NULL begin create database [{0}]; end else begin use master; ALTER DATABASE [{0}] SET SINGLE_USER WITH ROLLBACK IMMEDIATE; drop database [{0}]; create database [{0}]; end";
const string tempTbl = "use [{0}]; create table Temp (filename nvarchar(512), [file] varbinary(max)); use [{1}];";
const string insertBakFile = "INSERT INTO [{0}].dbo.Temp([filename], [file]) SELECT N'{1}' as [filename], * FROM OPENROWSET(BULK N'{1}', SINGLE_BLOB) AS [file]";
const string bakFileName = "{0}\\{1}_tmp_{2}.bak";
const string deleteRowsFromTemp = "DELETE FROM [{0}].dbo.Temp";
const string deleteTempDB = "use master; ALTER DATABASE [{0}] SET SINGLE_USER WITH ROLLBACK IMMEDIATE; drop database [{0}];";
string dbName = string.Empty;
string defaultBakPath = string.Empty;
string localPath = string.Empty;
long dbSize = 0;
bool useSameDB = false;
DateTime backExt = DateTime.UtcNow;
public SqlBackup(string connectionString, string localPath, bool useSameDBASTemp)
{
this.localPath = localPath;
this.useSameDB = useSameDBASTemp;
sqlConnection = new SqlConnection(connectionString);
sqlConnection.Open();
}
/// <summary>
/// Get size of DB in MB
/// </summary>
/// <param name="dbName"></param>
/// <returns></returns>
public long GetDBSize()
{
sqlCmd = new SqlCommand(string.Format(getDBSize, sqlConnection.Database), sqlConnection);
sqlCmd.CommandTimeout = sqlConnection.ConnectionTimeout;
object v = sqlCmd.ExecuteScalar();
if (v != null)
dbSize = (long)v;
else
v = 1;
sqlCmd.Dispose();
return dbSize;
}
/// <summary>
/// Create BAK files (default backup path)
/// </summary>
/// <returns></returns>
public int CreateBakupFiles()
{
backExt = DateTime.UtcNow;
string script = string.Format(createBakFiles1, sqlConnection.Database, backExt.ToString("yyyyMMddhhmm"));
int numberOfFiles = (int)(dbSize / 80); //try to make each bak file 80MB in size
if (numberOfFiles <= 0)
numberOfFiles = 1;
if (numberOfFiles > 64)
numberOfFiles = 64; //sql allows up to 64 files max
for (int i = 2; i <= numberOfFiles; i++)
{
script += string.Format(createBakFiles2, sqlConnection.Database, backExt.ToString("yyyyMMddhhmm"), i);
}
script += string.Format(createBakFiles3, sqlConnection.Database, backExt.ToString("yyyyMMddhhmm"));
sqlCmd = new SqlCommand(script, sqlConnection);
sqlCmd.CommandTimeout = sqlConnection.ConnectionTimeout;
sqlCmd.ExecuteNonQuery();
sqlCmd.CommandText = string.Format(getBackupPath, sqlConnection.Database, DateTime.Now.Date, DateTime.Now.Date.AddDays(1));
defaultBakPath = sqlCmd.ExecuteScalar() as string;
defaultBakPath = System.IO.Path.GetDirectoryName(defaultBakPath);
sqlCmd.Dispose();
return numberOfFiles;
}
/// <summary>
/// Create temp DB and table
/// </summary>
public void CreateTempDB()
{
if(useSameDB)
{
tmpDBName = sqlConnection.Database;
//return;
}
string workingDBName = sqlConnection.Database;
string cmd = string.Format(tempTbl, tmpDBName, sqlConnection.Database);
if (!useSameDB)
{
sqlCmd = new SqlCommand(string.Format(tempDB, tmpDBName), sqlConnection);
sqlCmd.ExecuteNonQuery();
sqlCmd.Dispose();
}
sqlCmd = new SqlCommand(cmd, sqlConnection);
sqlCmd.ExecuteNonQuery();
sqlCmd.Dispose();
}
/// <summary>
/// Insert a bak file into temp table
/// </summary>
/// <param name="i"></param>
public void InsertBakFile(int i)
{
sqlCmd = new SqlCommand(string.Format(insertBakFile, tmpDBName, string.Format(bakFileName, this.defaultBakPath, sqlConnection.Database+ backExt.ToString("yyyyMMddhhmm"), i)), sqlConnection);
sqlCmd.CommandTimeout = sqlConnection.ConnectionTimeout;
sqlCmd.ExecuteNonQuery();
sqlCmd.Dispose();
}
/// <summary>
/// Starts downloading asynchronously
/// </summary>
/// <param name="i"></param>
/// <param name="callbak"></param>
public void DownloadBakFile(int i, Action<object> callbak)
{
SqlCommand sqlCmd2 = new SqlCommand("SELECT * FROM [" + tmpDBName + "].dbo.Temp WHERE [filename] = " +
string.Format(bakFileName, this.defaultBakPath, sqlConnection.Database, i), new SqlConnection(sqlConnection.ConnectionString));
sqlCmd2.CommandTimeout = sqlConnection.ConnectionTimeout;
sqlCmd2.Connection.Open();
sqlCmd2.BeginExecuteReader(new AsyncCallback(CallBack), new { sqlCmd2, callbak, i }, System.Data.CommandBehavior.SequentialAccess);
}
/// <summary>
/// Download bak file
/// </summary>
/// <param name="i"></param>
/// <param name="callbak"></param>
public void DownloadBakFile(int i)
{
sqlCmd = new SqlCommand("SELECT * FROM [" + tmpDBName + "].dbo.Temp WHERE [filename] = N'" +
string.Format(bakFileName, this.defaultBakPath, sqlConnection.Database, i) + "'", sqlConnection);
sqlCmd.CommandTimeout = sqlConnection.ConnectionTimeout;
SqlDataReader sqldr = sqlCmd.ExecuteReader(System.Data.CommandBehavior.SequentialAccess);
sqldr.Read();
string fileName = sqldr.GetString(0);
System.IO.FileStream file = new System.IO.FileStream(System.IO.Path.Combine(this.localPath, System.IO.Path.GetFileName(fileName)),
System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite);
long startIndex = 0;
const int ChunkSize = 1024 * 32; //32 KB block
byte[] buffer = new byte[ChunkSize];
while (true)
{
long retrievedBytes = sqldr.GetBytes(1, startIndex, buffer, 0, ChunkSize);
file.Write(buffer, 0, (int)retrievedBytes);
startIndex += retrievedBytes;
if (retrievedBytes != ChunkSize)
break;
}
file.Close();
sqlCmd.Dispose();
}
/// <summary>
/// delete bak file
/// </summary>
/// <param name="i"></param>
public void DeleteBakFile()
{
sqlCmd = new SqlCommand(string.Format(deleteRowsFromTemp, tmpDBName), sqlConnection);
sqlCmd.CommandTimeout = sqlConnection.ConnectionTimeout;
sqlCmd.ExecuteNonQuery();
sqlCmd.Dispose();
}
/// <summary>
/// Delete temp rows and temp db
/// </summary>
public void DeleteTempDB()
{
sqlCmd = new SqlCommand(string.Format(deleteRowsFromTemp, tmpDBName), sqlConnection);
sqlCmd.CommandTimeout = sqlConnection.ConnectionTimeout;
sqlCmd.ExecuteNonQuery();
if (!useSameDB)
{
sqlCmd.CommandText = string.Format(deleteTempDB, tmpDBName);
sqlCmd.ExecuteNonQuery();
}
sqlCmd.Dispose();
}
void CallBack(IAsyncResult ar)
{
SqlCommand sqlc = ((dynamic)ar.AsyncState).sqlCmd2;
Action<object> callbak = ((dynamic)ar.AsyncState).callbak;
SqlDataReader sqldr = sqlc.EndExecuteReader(ar);
sqldr.Read();
string fileName = sqldr.GetString(0);
System.IO.FileStream file = new System.IO.FileStream(System.IO.Path.Combine(this.localPath, System.IO.Path.GetFileName(fileName)),
System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite);
long startIndex = 0;
const int ChunkSize = 1024 * 8;
while (true)
{
byte[] buffer = new byte[ChunkSize];
long retrievedBytes = sqldr.GetBytes(1, startIndex, buffer, 0, ChunkSize);
file.Write(buffer, 0, (int)retrievedBytes);
startIndex += retrievedBytes;
if (retrievedBytes != ChunkSize)
break;
}
file.Close();
sqlc.Dispose();
if (callbak != null)
callbak.Invoke(new { fname = System.IO.Path.GetFileName(fileName), i = (int)((dynamic)ar.AsyncState).i });
}
public void Dispose()
{
if (sqlConnection != null)
{
sqlConnection.Dispose();
}
sqlConnection = null;
}
}
}