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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 OpenSim 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.Data.Common;
using System.IO;
using System.Reflection;
using System.Text.RegularExpressions;
using log4net;
namespace OpenSim.Data.Migrations
{
/// <summary>
///
/// The Migration theory is based on the ruby on rails concept.
/// Each database driver is going to be allowed to have files in
/// Resources that specify the database migrations. They will be
/// of the form:
///
/// 001_Users.sql
/// 002_Users.sql
/// 003_Users.sql
/// 001_Prims.sql
/// 002_Prims.sql
/// ...etc...
///
/// When a database driver starts up, it specifies a resource that
/// needs to be brought up to the current revision. For instance:
///
/// Migration um = new Migration(DbConnection, "Users");
/// um.Upgrade();
///
/// This works out which version Users is at, and applies all the
/// revisions past it to it. If there is no users table, all
/// revisions are applied in order. Consider each future
/// migration to be an incremental roll forward of the tables in
/// question.
///
/// </summary>
public class Migration
{
private static readonly log4net.ILog m_log = log4net.LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType);
private string _type;
private DbConnection _conn;
private string _subtype;
private Assembly _assem;
private static readonly string _migrations_create = "create table migrations(name varchar(100), version int)";
private static readonly string _migrations_init = "insert into migrations values('migrations', 1)";
private static readonly string _migrations_find = "select version from migrations where name='migrations'";
public Migration(DbConnection conn, Assembly assem, string type)
{
_type = type;
_conn = conn;
_assem = assem;
}
private void Initialize()
{
// clever, eh, we figure out which migrations version we are
int migration_version = FindVersion("migrations");
if (migration_version > 0)
return;
// If not, create the migration tables
DbCommand cmd = _conn.CreateCommand();
cmd.CommandText = _migrations_create;
cmd.ExecuteNonQuery();
UpdateVersion("migrations", 1);
}
public void Update()
{
int version = 0;
version = FindVersion(_type);
List<string> migrations = GetMigrationsAfter(version);
DbCommand cmd = _conn.CreateCommand();
foreach (string m in migrations)
{
cmd.CommandText = m;
cmd.ExecuteNonQuery();
}
UpdateVersion(_type, MaxVersion());
}
private int MaxVersion()
{
int max = 0;
string[] names = _assem.GetManifestResourceNames();
List<string> migrations = new List<string>();
Regex r = new Regex(@"^(\d\d\d)_" + _type + @"\.sql");
foreach (string s in names)
{
Match m = r.Match(s);
int MigrationVersion = int.Parse(m.Groups[1].ToString());
if ( MigrationVersion > max )
max = MigrationVersion;
}
return max;
}
private int FindVersion(string type)
{
int version = 0;
DbCommand cmd = _conn.CreateCommand();
cmd.CommandText = "select version from migrations where name='" + type + "' limit 1";
using (IDataReader reader = cmd.ExecuteReader())
{
if (reader.Read())
{
version = Convert.ToInt32(reader["version"]);
}
reader.Close();
}
return version;
}
private void UpdateVersion(string type, int version)
{
DbCommand cmd = _conn.CreateCommand();
cmd.CommandText = "update migrations set version=" + version + " where name='" + type + "'";
cmd.ExecuteNonQuery();
}
private List<string> GetAllMigrations()
{
return GetMigrationsAfter(0);
}
private List<string> GetMigrationsAfter(int version)
{
string[] names = _assem.GetManifestResourceNames();
List<string> migrations = new List<string>();
Regex r = new Regex(@"^(\d\d\d)_" + _type + @"\.sql");
foreach (string s in names)
{
m_log.Info("MIGRATION: Resources: " + s);
if (s.EndsWith(_type + @"\.sql"))
{
Match m = r.Match(s);
m_log.Info("MIGRATION: Match: " + m.Groups[1].ToString());
int MigrationVersion = int.Parse(m.Groups[1].ToString());
using (Stream resource = _assem.GetManifestResourceStream(s))
{
using (StreamReader resourceReader = new StreamReader(resource))
{
string resourceString = resourceReader.ReadToEnd();
migrations.Add(resourceString);
}
}
}
}
// TODO: once this is working, get rid of this
if (migrations.Count < 1) {
throw new Exception(string.Format("Resource '{0}' was not found", _type));
}
return migrations;
}
}
}
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