IEnumerable <string> RunAutoMigrations(int schemaVersion)
{
var schema = schemaVersion == -1 // fresh database
? new Dictionary <string, List <string> >()
: store.Database.QuerySchema();
var commands = differ.CalculateSchemaChanges(schema, store.Configuration);
if (!commands.Any())
{
return(Enumerable.Empty <string>());
}
logger.LogInformation("Found {0} differences between current schema and configuration. Migrates schema to get up to date.", commands.Count);
return(commands.SelectMany(command => ExecuteCommand(command, false), (_, tablename) => tablename));
}
public void Run()
{
if (!store.Configuration.RunSchemaMigrationsOnStartup)
{
return;
}
var requiresReprojection = new List <string>();
var database = ((DocumentStore)store).Database;
var configuration = store.Configuration;
using (var tx = new TransactionScope(TransactionScopeOption.RequiresNew, new TransactionOptions {
IsolationLevel = IsolationLevel.Serializable
}))
{
// lock other migrators out while executing
using (var connection = database.Connect())
{
var parameters = new DynamicParameters();
parameters.Add("@Resource", "HybridDb");
parameters.Add("@DbPrincipal", "public");
parameters.Add("@LockMode", "Exclusive");
parameters.Add("@LockOwner", "Transaction");
parameters.Add("@LockTimeout", TimeSpan.FromMinutes(1).TotalMilliseconds);
parameters.Add("@Result", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
connection.Connection.Execute(@"sp_getapplock", parameters, commandType: CommandType.StoredProcedure);
var result = parameters.Get <int>("@Result");
if (result < 0)
{
throw new InvalidOperationException($"sp_getapplock failed with code {result}");
}
connection.Complete();
}
// create metadata table if it does not exist
var metadata = new Table("HybridDb", new Column("SchemaVersion", typeof(int)));
configuration.Tables.TryAdd(metadata.Name, metadata);
new CreateTable(metadata).Execute(database);
// get schema version
var currentSchemaVersion = database.RawQuery <int>(
$"select top 1 SchemaVersion from {database.FormatTableNameAndEscape("HybridDb")}")
.SingleOrDefault();
if (currentSchemaVersion > store.Configuration.ConfiguredVersion)
{
throw new InvalidOperationException(
$"Database schema is ahead of configuration. Schema is version {currentSchemaVersion}, " +
$"but configuration is version {store.Configuration.ConfiguredVersion}.");
}
// run provided migrations only if we are using real tables
if (database is SqlServerUsingRealTables)
{
if (currentSchemaVersion < configuration.ConfiguredVersion)
{
var migrationsToRun = migrations.OrderBy(x => x.Version).Where(x => x.Version > currentSchemaVersion).ToList();
logger.Information("Migrates schema from version {0} to {1}.", currentSchemaVersion, configuration.ConfiguredVersion);
foreach (var migration in migrationsToRun)
{
var migrationCommands = migration.MigrateSchema();
foreach (var command in migrationCommands)
{
requiresReprojection.AddRange(ExecuteCommand(database, command));
}
currentSchemaVersion++;
}
}
}
else
{
logger.Information("Skips provided migrations when not using real tables.");
}
// get the diff and run commands to get to configured schema
var schema = database.QuerySchema().Values.ToList(); // demeter go home!
var commands = differ.CalculateSchemaChanges(schema, configuration);
if (commands.Any())
{
logger.Information("Found {0} differences between current schema and configuration. Migrates schema to get up to date.", commands.Count);
foreach (var command in commands)
{
requiresReprojection.AddRange(ExecuteCommand(database, command));
}
}
// flag each document of tables that need to run a re-projection
foreach (var tablename in requiresReprojection)
{
// TODO: Only set RequireReprojection on command if it is documenttable - can it be done?
var design = configuration.DocumentDesigns.FirstOrDefault(x => x.Table.Name == tablename);
if (design == null)
{
continue;
}
database.RawExecute(
$"update {database.FormatTableNameAndEscape(tablename)} set AwaitsReprojection=@AwaitsReprojection",
new { AwaitsReprojection = true });
}
// update the schema version
database.RawExecute(string.Format(@"
if not exists (select * from {0})
insert into {0} (SchemaVersion) values (@version);
else
update {0} set SchemaVersion=@version",
database.FormatTableNameAndEscape("HybridDb")),
new { version = currentSchemaVersion });
tx.Complete();
}
}
