private static void CreateVersionInfo(DbConnection db)
{
using (var conn = db.Connect())
{
var sql = "CREATE TABLE `VersionInfo` (" +
"`Version` INTEGER NOT NULL, " +
"`AppliedOn` DATETIME DEFAULT CURRENT_TIMESTAMP, " +
"`Description` TEXT);";
conn.Query(sql);
sql = "CREATE UNIQUE INDEX IF NOT EXISTS `UC_Version` ON `VersionInfo` (`Version` ASC);";
conn.Query(sql);
}
}
public void MigrateToLatest(DbConnection db)
{
var versionInfo = GetVersionInfo (db);
var currentVersion = versionInfo != null ? versionInfo.Version : 0;
using (var conn = db.Connect())
using (var transaction = conn.BeginTransaction())
{
do
{
currentVersion++;
} while (MigrateToVersion(conn, currentVersion));
transaction.Commit();
}
}
protected static VersionInfo GetVersionInfo(DbConnection db)
{
using (var conn = db.Connect())
{
var sql = "SELECT Version FROM `VersionInfo` ORDER BY Version DESC LIMIT 1";
try
{
return conn.Query<VersionInfo>(sql).FirstOrDefault();
}
catch (Exception e)
{
if (!e.Message.Contains("no such table: VersionInfo"))
throw new Exception(e.Message, e);
CreateVersionInfo(db);
return conn.Query<VersionInfo>(sql).FirstOrDefault();
}
}
}