opensim-development – 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 System.Data.SqlClient;
using OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Region.Framework.Interfaces;
using System.Text;
namespace OpenSim.Data.MSSQL
{
public class MSSQLGenericTableHandler<T> where T : class, new()
{
// private static readonly ILog m_log =
// LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
protected string m_ConnectionString;
protected MSSQLManager m_database; //used for parameter type translation
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;
public MSSQLGenericTableHandler(string connectionString,
string realm, string storeName)
{
m_Realm = realm;
m_ConnectionString = connectionString;
if (storeName != String.Empty)
{
using (SqlConnection conn = new SqlConnection(m_ConnectionString))
{
conn.Open();
Migration m = new Migration(conn, GetType().Assembly, storeName);
m.Update();
}
}
m_database = new MSSQLManager(m_ConnectionString);
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(SqlDataReader reader)
{
if (m_ColumnNames != null)
return;
m_ColumnNames = new List<string>();
DataTable schemaTable = reader.GetSchemaTable();
foreach (DataRow row in schemaTable.Rows)
{
if (row["ColumnName"] != null &&
(!m_Fields.ContainsKey(row["ColumnName"].ToString())))
m_ColumnNames.Add(row["ColumnName"].ToString());
}
}
private List<string> GetConstraints()
{
List<string> constraints = new List<string>();
string query = string.Format(@"SELECT
COL_NAME(ic.object_id,ic.column_id) AS column_name
FROM sys.indexes AS i
INNER JOIN sys.index_columns AS ic
ON i.object_id = ic.object_id AND i.index_id = ic.index_id
WHERE i.is_primary_key = 1
AND i.object_id = OBJECT_ID('{0}');", m_Realm);
using (SqlConnection conn = new SqlConnection(m_ConnectionString))
using (SqlCommand cmd = new SqlCommand(query, conn))
{
conn.Open();
using (SqlDataReader rdr = cmd.ExecuteReader())
{
while (rdr.Read())
{
// query produces 0 to many rows of single column, so always add the first item in each row
constraints.Add((string)rdr[0]);
}
}
return constraints;
}
}
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 (SqlConnection conn = new SqlConnection(m_ConnectionString))
using (SqlCommand cmd = new SqlCommand())
{
for (int i = 0; i < fields.Length; i++)
{
cmd.Parameters.Add(m_database.CreateParameter(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.Connection = conn;
cmd.CommandText = query;
conn.Open();
return DoQuery(cmd);
}
}
protected T[] DoQuery(SqlCommand cmd)
{
List<T> result = new List<T>();
using (SqlDataReader 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 (m_Fields[name].GetValue(row) is bool)
{
int v = Convert.ToInt32(reader[name]);
m_Fields[name].SetValue(row, v != 0 ? true : false);
}
else if (m_Fields[name].GetValue(row) is UUID)
{
UUID uuid = UUID.Zero;
UUID.TryParse(reader[name].ToString(), out uuid);
m_Fields[name].SetValue(row, uuid);
}
else if (m_Fields[name].GetValue(row) is 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 (SqlConnection conn = new SqlConnection(m_ConnectionString))
using (SqlCommand cmd = new SqlCommand())
{
string query = String.Format("SELECT * FROM {0} WHERE {1}",
m_Realm, where);
cmd.Connection = conn;
cmd.CommandText = query;
//m_log.WarnFormat("[MSSQLGenericTable]: SELECT {0} WHERE {1}", m_Realm, where);
conn.Open();
return DoQuery(cmd);
}
}
public virtual bool Store(T row)
{
List<string> constraintFields = GetConstraints();
List<KeyValuePair<string, string>> constraints = new List<KeyValuePair<string, string>>();
using (SqlConnection conn = new SqlConnection(m_ConnectionString))
using (SqlCommand cmd = new SqlCommand())
{
StringBuilder query = new StringBuilder();
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(
"[MSSQL GENERIC TABLE HANDLER]: Trying to store field {0} for {1} which is unexpectedly null",
fi.Name, row));
if (constraintFields.Count > 0 && constraintFields.Contains(fi.Name))
{
constraints.Add(new KeyValuePair<string, string>(fi.Name, fi.GetValue(row).ToString()));
}
cmd.Parameters.Add(m_database.CreateParameter(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)
{
if (constraintFields.Count > 0 && constraintFields.Contains(kvp.Key))
{
constraints.Add(new KeyValuePair<string, string>(kvp.Key, kvp.Key));
}
names.Add(kvp.Key);
values.Add("@" + kvp.Key);
cmd.Parameters.Add(m_database.CreateParameter("@" + kvp.Key, kvp.Value));
}
}
query.AppendFormat("UPDATE {0} SET ", m_Realm);
int i = 0;
for (i = 0; i < names.Count - 1; i++)
{
query.AppendFormat("[{0}] = {1}, ", names[i], values[i]);
}
query.AppendFormat("[{0}] = {1} ", names[i], values[i]);
if (constraints.Count > 0)
{
List<string> terms = new List<string>();
for (int j = 0; j < constraints.Count; j++)
{
terms.Add(" [" + constraints[j].Key + "] = @" + constraints[j].Key);
}
string where = String.Join(" AND ", terms.ToArray());
query.AppendFormat(" WHERE {0} ", where);
}
cmd.Connection = conn;
cmd.CommandText = query.ToString();
conn.Open();
if (cmd.ExecuteNonQuery() > 0)
{
//m_log.WarnFormat("[MSSQLGenericTable]: Updating {0}", m_Realm);
return true;
}
else
{
// assume record has not yet been inserted
query = new StringBuilder();
query.AppendFormat("INSERT INTO {0} ([", m_Realm);
query.Append(String.Join("],[", names.ToArray()));
query.Append("]) values (" + String.Join(",", values.ToArray()) + ")");
cmd.Connection = conn;
cmd.CommandText = query.ToString();
//m_log.WarnFormat("[MSSQLGenericTable]: Inserting into {0}", m_Realm);
if (conn.State != ConnectionState.Open)
conn.Open();
if (cmd.ExecuteNonQuery() > 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)
{
if (fields.Length != keys.Length)
return false;
List<string> terms = new List<string>();
using (SqlConnection conn = new SqlConnection(m_ConnectionString))
using (SqlCommand cmd = new SqlCommand())
{
for (int i = 0; i < fields.Length; i++)
{
cmd.Parameters.Add(m_database.CreateParameter(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.Connection = conn;
cmd.CommandText = query;
conn.Open();
if (cmd.ExecuteNonQuery() > 0)
{
//m_log.Warn("[MSSQLGenericTable]: " + deleteCommand);
return true;
}
return false;
}
}
}
}