private static string InitializeCache(string host, string mysqlConn, CMySqlCachePeer cachePeer = null)
{
Dictionary <string, string> mapTables = GetDataTableMap(host);
if (mapTables.Count == 0)
{
return("Host not set for quering cache data");
}
string errMsg = "";
MySqlConnection conn = null;
try
{
DataSet ds = new DataSet(host);
conn = new MySqlConnection(mysqlConn);
conn.Open();
foreach (var p in mapTables)
{
string tableName = p.Key;
string sql = "select * from " + p.Key;
if (p.Value != null && p.Value.Length > 0)
{
sql += (" where " + p.Value);
}
MySqlDataAdapter adapter = new MySqlDataAdapter(new MySqlCommand(sql, conn));
adapter.Fill(ds, tableName);
if (cachePeer != null)
{
uint res = cachePeer.SendResult(idQuerying);
if (res == CSocketPeer.REQUEST_CANCELED || res == CSocketPeer.SOCKET_NOT_FOUND)
{
throw new Exception("Connection disconnected or message canceled");
}
}
}
m_mapHostDS[host] = ds;
}
catch (Exception ex)
{
errMsg = ex.Message;
}
finally
{
if (conn != null && conn.State != ConnectionState.Closed)
{
conn.Close();
}
}
return(errMsg);
}
static void Main(string[] args)
{
CMySqlCachePeer.CCacheSource source = new CMySqlCachePeer.CCacheSource("root", "Smash123");
//server cache contains five tables (city, language, store, category, and staff) of MySql sample database sakila
source.TableFilter["sakila.city"] = "";
source.TableFilter["sakila.language"] = "";
source.TableFilter["sakila.store"] = "";
source.TableFilter["sakila.category"] = "";
source.TableFilter["sakila.staff"] = "";
const string mysql_host = "ws-yye-1";
//query all the above five tables into cache on one given MySql server located at ws-yye-1
string errMsg = CMySqlCachePeer.InitializeCache(mysql_host, source);
if (errMsg != null && errMsg.Length > 0)
{
Console.WriteLine(errMsg);
}
else
{
#if DEBUG
Console.WriteLine("Real-time server cache initialized from MySql server " + mysql_host);
//query a datatable from cache
DataTable dt = CMySqlCachePeer.Get(mysql_host, "sakila.staff");
//query a subset of records from cache
dt = CMySqlCachePeer.Get(mysql_host, "sakila.city", "city_id >= 10 and city_id <= 19", "city_id");
#endif
}
using (CMySocketProServer MySocketProServer = new CMySocketProServer())
{
if (!MySocketProServer.Run(20901))
{
Console.WriteLine("Error code = " + CSocketProServer.LastSocketError.ToString());
}
Console.WriteLine("Input a line to close the application ......");
Console.ReadLine();
}
}
private static string InitializeCache(string host, string mysqlConn, CMySqlCachePeer cachePeer = null)
{
Dictionary<string, string> mapTables = GetDataTableMap(host);
if (mapTables.Count == 0)
return "Host not set for quering cache data";
string errMsg = "";
MySqlConnection conn = null;
try
{
DataSet ds = new DataSet(host);
conn = new MySqlConnection(mysqlConn);
conn.Open();
foreach (var p in mapTables)
{
string tableName = p.Key;
string sql = "select * from " + p.Key;
if (p.Value != null && p.Value.Length > 0)
{
sql += (" where " + p.Value);
}
MySqlDataAdapter adapter = new MySqlDataAdapter(new MySqlCommand(sql, conn));
adapter.Fill(ds, tableName);
if (cachePeer != null)
{
uint res = cachePeer.SendResult(idQuerying);
if (res == CSocketPeer.REQUEST_CANCELED || res == CSocketPeer.SOCKET_NOT_FOUND)
{
throw new Exception("Connection disconnected or message canceled");
}
}
}
m_mapHostDS[host] = ds;
}
catch (Exception ex)
{
errMsg = ex.Message;
}
finally
{
if (conn != null && conn.State != ConnectionState.Closed)
conn.Close();
}
return errMsg;
}
