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namespace GMap
.NET.CacheProviders
{
using System;
using System.Data.SqlClient;
using System.Diagnostics;
using System.IO;
using GMap.NET.MapProviders;
/// <summary>
/// image cache for ms sql server
/// optimized by mmurfinsimmons@gmail.com
/// </summary>
public class MsSQLPureImageCache
: PureImageCache, IDisposable
{
string connectionString
= string.Empty;
public string ConnectionString
{
get
{
return connectionString
;
}
set
{
if(connectionString
!= value)
{
connectionString
= value;
if(Initialized
)
{
Dispose
();
Initialize
();
}
}
}
}
SqlCommand cmdInsert
;
SqlCommand cmdFetch
;
SqlConnection cnGet
;
SqlConnection cnSet
;
bool initialized
= false;
/// <summary>
/// is cache initialized
/// </summary>
public bool Initialized
{
get
{
lock(this)
{
return initialized
;
}
}
private set
{
lock(this)
{
initialized
= value;
}
}
}
/// <summary>
/// inits connection to server
/// </summary>
/// <returns></returns>
public bool Initialize
()
{
lock(this)
{
if(!Initialized
)
{
#region prepare mssql & cache table
try
{
// different connections so the multi-thread inserts and selects don't collide on open readers.
this.cnGet = new SqlConnection
(connectionString
);
this.cnGet.Open();
this.cnSet = new SqlConnection
(connectionString
);
this.cnSet.Open();
bool tableexists
= false;
using(SqlCommand cmd
= new SqlCommand
("select object_id('GMapNETcache')", cnGet
))
{
object objid
= cmd
.ExecuteScalar();
tableexists
= (objid
!= null && objid
!= DBNull
.Value);
}
if(!tableexists
)
{
using(SqlCommand cmd
= new SqlCommand
(
"CREATE TABLE [GMapNETcache] ( \n"
+ " [Type] [int] NOT NULL, \n"
+ " [Zoom] [int] NOT NULL, \n"
+ " [X] [int] NOT NULL, \n"
+ " [Y] [int] NOT NULL, \n"
+ " [Tile] [image] NOT NULL, \n"
+ " CONSTRAINT [PK_GMapNETcache] PRIMARY KEY CLUSTERED (Type, Zoom, X, Y) \n"
+ ")", cnGet
))
{
cmd
.ExecuteNonQuery();
}
}
this.cmdFetch = new SqlCommand
("SELECT [Tile] FROM [GMapNETcache] WITH (NOLOCK) WHERE [X]=@x AND [Y]=@y AND [Zoom]=@zoom AND [Type]=@type", cnGet
);
this.cmdFetch.Parameters.Add("@x",
System.Data.SqlDbType.Int);
this.cmdFetch.Parameters.Add("@y",
System.Data.SqlDbType.Int);
this.cmdFetch.Parameters.Add("@zoom",
System.Data.SqlDbType.Int);
this.cmdFetch.Parameters.Add("@type",
System.Data.SqlDbType.Int);
this.cmdFetch.Prepare();
this.cmdInsert = new SqlCommand
("INSERT INTO [GMapNETcache] ( [X], [Y], [Zoom], [Type], [Tile] ) VALUES ( @x, @y, @zoom, @type, @tile )", cnSet
);
this.cmdInsert.Parameters.Add("@x",
System.Data.SqlDbType.Int);
this.cmdInsert.Parameters.Add("@y",
System.Data.SqlDbType.Int);
this.cmdInsert.Parameters.Add("@zoom",
System.Data.SqlDbType.Int);
this.cmdInsert.Parameters.Add("@type",
System.Data.SqlDbType.Int);
this.cmdInsert.Parameters.Add("@tile",
System.Data.SqlDbType.Image); //, calcmaximgsize);
//can't prepare insert because of the IMAGE field having a variable size. Could set it to some 'maximum' size?
Initialized
= true;
}
catch(Exception ex
)
{
this.initialized = false;
Debug
.WriteLine(ex
.Message);
}
#endregion
}
return Initialized
;
}
}
#region IDisposable Members
public void Dispose
()
{
lock(cmdInsert
)
{
if(cmdInsert
!= null)
{
cmdInsert
.Dispose();
cmdInsert
= null;
}
if(cnSet
!= null)
{
cnSet
.Dispose();
cnSet
= null;
}
}
lock(cmdFetch
)
{
if(cmdFetch
!= null)
{
cmdFetch
.Dispose();
cmdFetch
= null;
}
if(cnGet
!= null)
{
cnGet
.Dispose();
cnGet
= null;
}
}
Initialized
= false;
}
#endregion
#region PureImageCache Members
public bool PutImageToCache
(byte[] tile,
int type, GPoint pos,
int zoom
)
{
bool ret
= true;
{
if(Initialize
())
{
try
{
lock(cmdInsert
)
{
cmdInsert
.Parameters["@x"].Value = pos
.X;
cmdInsert
.Parameters["@y"].Value = pos
.Y;
cmdInsert
.Parameters["@zoom"].Value = zoom
;
cmdInsert
.Parameters["@type"].Value = type
;
cmdInsert
.Parameters["@tile"].Value = tile
;
cmdInsert
.ExecuteNonQuery();
}
}
catch(Exception ex
)
{
Debug
.WriteLine(ex
.ToString());
ret
= false;
Dispose
();
}
}
}
return ret
;
}
public PureImage GetImageFromCache
(int type, GPoint pos,
int zoom
)
{
PureImage ret
= null;
{
if(Initialize
())
{
try
{
object odata
= null;
lock(cmdFetch
)
{
cmdFetch
.Parameters["@x"].Value = pos
.X;
cmdFetch
.Parameters["@y"].Value = pos
.Y;
cmdFetch
.Parameters["@zoom"].Value = zoom
;
cmdFetch
.Parameters["@type"].Value = type
;
odata
= cmdFetch
.ExecuteScalar();
}
if(odata
!= null && odata
!= DBNull
.Value)
{
byte[] tile
= (byte[])odata
;
if(tile
!= null && tile
.Length > 0)
{
if(GMapProvider
.TileImageProxy != null)
{
ret
= GMapProvider
.TileImageProxy.FromArray(tile
);
}
}
tile
= null;
}
}
catch(Exception ex
)
{
Debug
.WriteLine(ex
.ToString());
ret
= null;
Dispose
();
}
}
}
return ret
;
}
/// <summary>
/// NotImplemented
/// </summary>
/// <param name="date"></param>
/// <param name="type"></param>
/// <returns></returns>
int PureImageCache
.DeleteOlderThan(DateTime date,
int ? type
)
{
throw new NotImplementedException
();
}
#endregion
}
}