/// <summary>
/// Retrieves the latest migration script version from the migration directory.
/// </summary>
/// <returns>The latest script version</returns>
private long GetLatestScriptVersion(DatabaseCommandArguments args)
{
IOrderedEnumerable <IMigrationScriptFile> files = _migrationDirectory.GetScripts(args)
.OrderByDescending(x => x.Version);
IMigrationScriptFile latestFile = files.FirstOrDefault();
if (latestFile != null)
{
return(latestFile.Version);
}
return(0);
}
public long GetNewVersionNumber(IMigrationDirectory migrationDirectory, IScriptsDirectoryPathArgs args)
{
long lastNumber = 0;
// get the latest number in use
IEnumerable <IMigrationScriptFile> scripts = migrationDirectory.GetScripts(args);
if (scripts.Count() > 0)
{
lastNumber = scripts.Max(script => script.Version);
}
// increment and return
return(lastNumber + 1);
}
public long GetNewVersionNumber(IMigrationDirectory migrationDirectory)
{
long lastNumber = 0;
// get the latest number in use
IEnumerable<IMigrationScriptFile> scripts = migrationDirectory.GetScripts();
if (scripts.Count() > 0)
{
lastNumber = scripts.Max(script => script.Version);
}
// increment and return
return lastNumber + 1;
}
/// <summary>
/// Executes the Command's logic.
/// </summary>
protected override void Execute(MigrateCommandArgs args)
{
IOrderedEnumerable <IMigrationScriptFile> files = _migrationDirectory.GetScripts(args)
.OrderByDescending(x => x.Version);
if (files.Count() == 0)
{
Log.WriteLine("No migration scripts were found.");
return;
}
long currentVersion = GetDatabaseVersion();
long targetVersion = args.TargetVersion;
if (targetVersion == -1)
{
// if version not provided, assume we want to migrate to the latest migration script version
targetVersion = files.Select(x => x.Version).First();
}
Log.WriteLine("Database is at version:".PadRight(30) + currentVersion);
MigrationDirection direction;
if (currentVersion < targetVersion)
{
direction = MigrationDirection.Up;
MigrateUp(currentVersion, targetVersion, files);
Log.WriteLine("Migrated up to version:".PadRight(30) + targetVersion);
}
else if (currentVersion > targetVersion)
{
direction = MigrationDirection.Down;
MigrateDown(currentVersion, targetVersion, files);
Log.WriteLine("Migrated down to version:".PadRight(30) + targetVersion);
}
else
{
return;
}
// execute the post migration actions
var postMigrationHooks = Program.Current.CommandRepository.Commands
.Where(cmd => cmd is IPostMigrationHook)
.Cast <IPostMigrationHook>()
.Where(hook => hook.ShouldRun(direction));
if (postMigrationHooks.Count() > 0)
{
Log.WriteLine("Executing post migration hooks...");
foreach (var hook in postMigrationHooks)
{
Log.WriteLine(" {0}", hook.CommandName);
hook.Log = Log;
hook.OnPostMigration(args, direction);
}
}
else
{
Log.WriteLine("No post migration hooks were run.");
}
}