clockwerk-opensim – Rev 1
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/*
* Copyright (c) Contributors, http://opensimulator.org/
* See CONTRIBUTORS.TXT for a full list of copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the OpenSimulator Project nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
using System;
using System.Collections.Generic;
using System.Data;
using System.Reflection;
using log4net;
using MySql.Data.MySqlClient;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
namespace OpenSim.Data.MySQL
{
public class MySQLGenericTableHandler<T> : MySqlFramework where T: class, new()
{
// private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
protected Dictionary<string, FieldInfo> m_Fields =
new Dictionary<string, FieldInfo>();
protected List<string> m_ColumnNames = null;
protected string m_Realm;
protected FieldInfo m_DataField = null;
protected virtual Assembly Assembly
{
get { return GetType().Assembly; }
}
public MySQLGenericTableHandler(string connectionString,
string realm, string storeName) : base(connectionString)
{
m_Realm = realm;
m_connectionString = connectionString;
if (storeName != String.Empty)
{
using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
{
dbcon.Open();
Migration m = new Migration(dbcon, Assembly, storeName);
m.Update();
}
}
Type t = typeof(T);
FieldInfo[] fields = t.GetFields(BindingFlags.Public |
BindingFlags.Instance |
BindingFlags.DeclaredOnly);
if (fields.Length == 0)
return;
foreach (FieldInfo f in fields)
{
if (f.Name != "Data")
m_Fields[f.Name] = f;
else
m_DataField = f;
}
}
private void CheckColumnNames(IDataReader reader)
{
if (m_ColumnNames != null)
return;
List<string> columnNames = new List<string>();
DataTable schemaTable = reader.GetSchemaTable();
foreach (DataRow row in schemaTable.Rows)
{
if (row["ColumnName"] != null &&
(!m_Fields.ContainsKey(row["ColumnName"].ToString())))
columnNames.Add(row["ColumnName"].ToString());
}
m_ColumnNames = columnNames;
}
public virtual T[] Get(string field, string key)
{
return Get(new string[] { field }, new string[] { key });
}
public virtual T[] Get(string[] fields, string[] keys)
{
if (fields.Length != keys.Length)
return new T[0];
List<string> terms = new List<string>();
using (MySqlCommand cmd = new MySqlCommand())
{
for (int i = 0 ; i < fields.Length ; i++)
{
cmd.Parameters.AddWithValue(fields[i], keys[i]);
terms.Add("`" + fields[i] + "` = ?" + fields[i]);
}
string where = String.Join(" and ", terms.ToArray());
string query = String.Format("select * from {0} where {1}",
m_Realm, where);
cmd.CommandText = query;
return DoQuery(cmd);
}
}
protected T[] DoQuery(MySqlCommand cmd)
{
List<T> result = new List<T>();
using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
{
dbcon.Open();
cmd.Connection = dbcon;
using (IDataReader reader = cmd.ExecuteReader())
{
if (reader == null)
return new T[0];
CheckColumnNames(reader);
while (reader.Read())
{
T row = new T();
foreach (string name in m_Fields.Keys)
{
if (reader[name] is DBNull)
{
continue;
}
if (m_Fields[name].FieldType == typeof(bool))
{
int v = Convert.ToInt32(reader[name]);
m_Fields[name].SetValue(row, v != 0 ? true : false);
}
else if (m_Fields[name].FieldType == typeof(UUID))
{
m_Fields[name].SetValue(row, DBGuid.FromDB(reader[name]));
}
else if (m_Fields[name].FieldType == typeof(int))
{
int v = Convert.ToInt32(reader[name]);
m_Fields[name].SetValue(row, v);
}
else
{
m_Fields[name].SetValue(row, reader[name]);
}
}
if (m_DataField != null)
{
Dictionary<string, string> data =
new Dictionary<string, string>();
foreach (string col in m_ColumnNames)
{
data[col] = reader[col].ToString();
if (data[col] == null)
data[col] = String.Empty;
}
m_DataField.SetValue(row, data);
}
result.Add(row);
}
}
}
return result.ToArray();
}
public virtual T[] Get(string where)
{
using (MySqlCommand cmd = new MySqlCommand())
{
string query = String.Format("select * from {0} where {1}",
m_Realm, where);
cmd.CommandText = query;
return DoQuery(cmd);
}
}
public virtual bool Store(T row)
{
// m_log.DebugFormat("[MYSQL GENERIC TABLE HANDLER]: Store(T row) invoked");
using (MySqlCommand cmd = new MySqlCommand())
{
string query = "";
List<String> names = new List<String>();
List<String> values = new List<String>();
foreach (FieldInfo fi in m_Fields.Values)
{
names.Add(fi.Name);
values.Add("?" + fi.Name);
// Temporarily return more information about what field is unexpectedly null for
// http://opensimulator.org/mantis/view.php?id=5403. This might be due to a bug in the
// InventoryTransferModule or we may be required to substitute a DBNull here.
if (fi.GetValue(row) == null)
throw new NullReferenceException(
string.Format(
"[MYSQL GENERIC TABLE HANDLER]: Trying to store field {0} for {1} which is unexpectedly null",
fi.Name, row));
cmd.Parameters.AddWithValue(fi.Name, fi.GetValue(row).ToString());
}
if (m_DataField != null)
{
Dictionary<string, string> data =
(Dictionary<string, string>)m_DataField.GetValue(row);
foreach (KeyValuePair<string, string> kvp in data)
{
names.Add(kvp.Key);
values.Add("?" + kvp.Key);
cmd.Parameters.AddWithValue("?" + kvp.Key, kvp.Value);
}
}
query = String.Format("replace into {0} (`", m_Realm) + String.Join("`,`", names.ToArray()) + "`) values (" + String.Join(",", values.ToArray()) + ")";
cmd.CommandText = query;
if (ExecuteNonQuery(cmd) > 0)
return true;
return false;
}
}
public virtual bool Delete(string field, string key)
{
return Delete(new string[] { field }, new string[] { key });
}
public virtual bool Delete(string[] fields, string[] keys)
{
// m_log.DebugFormat(
// "[MYSQL GENERIC TABLE HANDLER]: Delete(string[] fields, string[] keys) invoked with {0}:{1}",
// string.Join(",", fields), string.Join(",", keys));
if (fields.Length != keys.Length)
return false;
List<string> terms = new List<string>();
using (MySqlCommand cmd = new MySqlCommand())
{
for (int i = 0 ; i < fields.Length ; i++)
{
cmd.Parameters.AddWithValue(fields[i], keys[i]);
terms.Add("`" + fields[i] + "` = ?" + fields[i]);
}
string where = String.Join(" and ", terms.ToArray());
string query = String.Format("delete from {0} where {1}", m_Realm, where);
cmd.CommandText = query;
return ExecuteNonQuery(cmd) > 0;
}
}
public long GetCount(string field, string key)
{
return GetCount(new string[] { field }, new string[] { key });
}
public long GetCount(string[] fields, string[] keys)
{
if (fields.Length != keys.Length)
return 0;
List<string> terms = new List<string>();
using (MySqlCommand cmd = new MySqlCommand())
{
for (int i = 0; i < fields.Length; i++)
{
cmd.Parameters.AddWithValue(fields[i], keys[i]);
terms.Add("`" + fields[i] + "` = ?" + fields[i]);
}
string where = String.Join(" and ", terms.ToArray());
string query = String.Format("select count(*) from {0} where {1}",
m_Realm, where);
cmd.CommandText = query;
Object result = DoQueryScalar(cmd);
return Convert.ToInt64(result);
}
}
public long GetCount(string where)
{
using (MySqlCommand cmd = new MySqlCommand())
{
string query = String.Format("select count(*) from {0} where {1}",
m_Realm, where);
cmd.CommandText = query;
object result = DoQueryScalar(cmd);
return Convert.ToInt64(result);
}
}
public object DoQueryScalar(MySqlCommand cmd)
{
using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
{
dbcon.Open();
cmd.Connection = dbcon;
return cmd.ExecuteScalar();
}
}
}
}
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