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Mantis#1736. Thank you kindly, StrawberryFride for a patch that:

Browse Source 
Many issues with handling connections in MSSQL, have rearchitected to 
ensure that connections are always opened and closed in a timely fashion 
& disposed of cleanly, and removed unnecessary lock statements. SQL 
Server performance seems to have improved considerably as a result, 
and various timeout errors seem to have been fixed.
This commit is contained in:
Charles Krinke
2008-07-17 13:43:31 +00:00
parent ed4241583f
commit e8412dcd42
8 changed files with 780 additions and 709 deletions
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141
OpenSim/Data/MSSQL/MSSQLManager.cs
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@@ -44,11 +44,6 @@ namespace OpenSim.Data.MSSQL
{
private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
/// <summary>
/// The database connection object
/// </summary>
private IDbConnection dbcon;
/// <summary>
/// Connection string for ADO.net
/// </summary>
@@ -57,11 +52,24 @@ namespace OpenSim.Data.MSSQL
public MSSQLManager(string dataSource, string initialCatalog, string persistSecurityInfo, string userId,
string password)
{
connectionString = "Data Source=" + dataSource + ";Initial Catalog=" + initialCatalog +
";Persist Security Info=" + persistSecurityInfo + ";User ID=" + userId + ";Password=" +
password + ";";
dbcon = new SqlConnection(connectionString);
dbcon.Open();
SqlConnectionStringBuilder builder = new SqlConnectionStringBuilder();
builder.DataSource = dataSource;
builder.InitialCatalog = initialCatalog;
builder.PersistSecurityInfo = Convert.ToBoolean(persistSecurityInfo);
builder.UserID = userId;
builder.Password = password;
builder.ApplicationName = Assembly.GetEntryAssembly().Location;
connectionString = builder.ToString();
}
private SqlConnection createConnection()
{
SqlConnection conn = new SqlConnection(connectionString);
conn.Open();
return conn;
}
//private DataTable createRegionsTable()
@@ -121,7 +129,7 @@ namespace OpenSim.Data.MSSQL
}
/// <summary>
///
/// Define Table function
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
@@ -178,35 +186,11 @@ namespace OpenSim.Data.MSSQL
}
}
/// <summary>
/// Shuts down the database connection
/// </summary>
public void Close()
{
dbcon.Close();
dbcon = null;
}
/// <summary>
/// Reconnects to the database
/// </summary>
public void Reconnect()
private static readonly Dictionary<string, string> emptyDictionary = new Dictionary<string, string>();
internal AutoClosingSqlCommand Query(string sql)
{
lock (dbcon)
{
try
{
// Close the DB connection
dbcon.Close();
// Try reopen it
dbcon = new SqlConnection(connectionString);
dbcon.Open();
}
catch (Exception e)
{
m_log.Error("Unable to reconnect to database " + e.ToString());
}
}
return Query(sql, emptyDictionary);
}
/// <summary>
@@ -215,18 +199,20 @@ namespace OpenSim.Data.MSSQL
/// <param name="sql">The SQL string - replace any variables such as WHERE x = "y" with WHERE x = @y</param>
/// <param name="parameters">The parameters - index so that @y is indexed as 'y'</param>
/// <returns>A Sql DB Command</returns>
public IDbCommand Query(string sql, Dictionary<string, string> parameters)
internal AutoClosingSqlCommand Query(string sql, Dictionary<string, string> parameters)
{
SqlCommand dbcommand = (SqlCommand)dbcon.CreateCommand();
SqlCommand dbcommand = createConnection().CreateCommand();
dbcommand.CommandText = sql;
foreach (KeyValuePair<string, string> param in parameters)
{
dbcommand.Parameters.AddWithValue(param.Key, param.Value);
}
return (IDbCommand)dbcommand;
return new AutoClosingSqlCommand(dbcommand);
}
/// <summary>
/// Runs a database reader object and returns a region row
/// </summary>
@@ -400,7 +386,6 @@ namespace OpenSim.Data.MSSQL
if (reader.Read())
{
// Region Main
asset = new AssetBase();
asset.Data = (byte[])reader["data"];
asset.Description = (string)reader["description"];
@@ -443,19 +428,20 @@ namespace OpenSim.Data.MSSQL
bool returnval = false;
try
using (IDbCommand result = Query(sql, parameters))
{
IDbCommand result = Query(sql, parameters);
try
{
if (result.ExecuteNonQuery() == 1)
returnval = true;
if (result.ExecuteNonQuery() == 1)
returnval = true;
result.Dispose();
}
catch (Exception e)
{
m_log.Error(e.ToString());
return false;
}
catch (Exception e)
{
m_log.Error(e.ToString());
return false;
}
}
return returnval;
@@ -467,19 +453,12 @@ namespace OpenSim.Data.MSSQL
/// <param name="name">the ressource string</param>
public void ExecuteResourceSql(string name)
{
SqlCommand cmd = new SqlCommand(getResourceString(name), (SqlConnection)dbcon);
cmd.ExecuteNonQuery();
cmd.Dispose();
using (IDbCommand cmd = Query(getResourceString(name), new Dictionary<string,string>()))
{
cmd.ExecuteNonQuery();
}
}
/// <summary>
///
/// </summary>
/// <returns>The actual SqlConnection</returns>
public SqlConnection getConnection()
{
return (SqlConnection)dbcon;
}
/// <summary>
/// Given a list of tables, return the version of the tables, as seen in the database
@@ -487,30 +466,29 @@ namespace OpenSim.Data.MSSQL
/// <param name="tableList"></param>
public void GetTableVersion(Dictionary<string, string> tableList)
{
lock (dbcon)
Dictionary<string, string> param = new Dictionary<string, string>();
param["dbname"] = new SqlConnectionStringBuilder(connectionString).InitialCatalog;
using (IDbCommand tablesCmd =
Query("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_CATALOG=@dbname", param))
using (IDataReader tables = tablesCmd.ExecuteReader())
{
Dictionary<string, string> param = new Dictionary<string, string>();
param["dbname"] = dbcon.Database;
IDbCommand tablesCmd =
Query("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_CATALOG=@dbname", param);
using (IDataReader tables = tablesCmd.ExecuteReader())
while (tables.Read())
{
while (tables.Read())
try
{
try
{
string tableName = (string)tables["TABLE_NAME"];
if (tableList.ContainsKey(tableName))
tableList[tableName] = tableName;
}
catch (Exception e)
{
m_log.Error(e.ToString());
}
string tableName = (string)tables["TABLE_NAME"];
if (tableList.ContainsKey(tableName))
tableList[tableName] = tableName;
}
catch (Exception e)
{
m_log.Error(e.ToString());
}
tables.Close();
}
tables.Close();
}
}
/// <summary>
@@ -546,7 +524,6 @@ namespace OpenSim.Data.MSSQL
// string dllName = module.Assembly.ManifestModule.Name;
Version dllVersion = module.Assembly.GetName().Version;
return
string.Format("{0}.{1}.{2}.{3}", dllVersion.Major, dllVersion.Minor, dllVersion.Build,
dllVersion.Revision);