public bool MigrationApplied(string schema, StoreMigration migration)
{
if (!_storeDatabaseDriver.TableExists(schema, VERSION_TABLE))
{
//_storeDatabaseDriver.CreateTable<MigrationVersionEntity>(schema, VERSION_TABLE);
return(false);
}
var versionRecord = _storeDatabaseDriver.Find <MigrationVersionEntity>(schema, VERSION_TABLE, VERSION_ID, migration.Version);
if (versionRecord.Any())
{
if (migration.Version == INITIAL_VERSION && versionRecord.First().VersionKey != migration.VersionKey)
{
throw new DataMigrationException(
$"Incompatible initial migration already applied, expected key is {migration.VersionKey} but key in the database is {versionRecord.First().VersionKey}. Clear target database and try again.");
}
// edititng incrementatl migration can be partially applied
if (/*migration.Version != INITIAL_VERSION &&*/ migration.Commands.Length != versionRecord.First().NextIndex)
{
return(false);
}
return(true);
}
return(false);
}
public string MigrationToString(StoreMigration migration)
{
var sb = new StringBuilder();
foreach (var cmd in migration.Commands)
{
switch (cmd.Operation)
{
// ToDo: add foreign key constraints
case MigrationOperation.CreateTable:
GenerateTableScript(sb, cmd.Table);
break;
case MigrationOperation.AddColumn:
GenerateColumnScript(sb, cmd.TableName, cmd.Column, "CREATE");
break;
case MigrationOperation.AlterColumn:
GenerateColumnScript(sb, cmd.TableName, cmd.Column, "ALTER");
break;
case MigrationOperation.AlterColumnName:
GenerateColumnRenameScript(sb, cmd.TableName, cmd.ColumnName, cmd.NewValue);
break;
case MigrationOperation.CreateSchema:
sb.AppendLine($"CREATE SCHEMA ({cmd.SchemaName})");
break;
case MigrationOperation.AlterSchemaName:
sb.AppendLine($"ALTER SCHEMA {cmd.SchemaName} ({cmd.NewValue})");
break;
// V1.0+ migrations
case MigrationOperation.DeleteTable:
sb.AppendLine($"DELETE TABLE ({cmd.TableName})");
break;
case MigrationOperation.AlterTableName:
sb.AppendLine($"RENAME TABLE {cmd.TableName} ({cmd.NewValue})");
break;
case MigrationOperation.DeleteColumn:
sb.AppendLine($"DELETE COLUMN ({cmd.TableName}.{cmd.ColumnName})");
break;
default:
sb.AppendLine($"{cmd.OperationCode}");
break;
}
sb.AppendLine();
}
return(sb.ToString());
}
public void ApplyMigration(string schema, StoreMigration migration)
{
int nextIndex = 0;
try
{
// try read version - table maybe doesn't exist
var lastVersionRecord = _storeDatabaseDriver.Find <MigrationVersionEntity>(schema, VERSION_TABLE, VERSION_ID, migration.Version);
if (lastVersionRecord.Any())
{
nextIndex = lastVersionRecord.First().NextIndex;
}
}
catch { }
// skip migrations that already applied;
var commands = migration.Commands.Skip(nextIndex);
foreach (var command in commands)
{
nextIndex++;
switch (command.Operation)
{
// ToDo: add foreign key constraints
case MigrationOperation.CreateSchema:
_storeDatabaseDriver.CreateSchema(command.SchemaName);
_storeDatabaseDriver.CreateTable <MigrationVersionEntity>(schema, VERSION_TABLE);
// this operation is not considered as object operation
//nextIndex--;
break;
case MigrationOperation.AlterSchemaName:
// https://www.sqlservercentral.com/articles/renaming-a-schema-in-sql-server
throw new NotImplementedException("SQL Server doesn't support simple schema rename. ");
case MigrationOperation.CreateTable:
_storeDatabaseDriver.CreateTable(command.SchemaName, command.Table);
break;
// V1.0+ migrations
case MigrationOperation.DeleteTable:
_storeDatabaseDriver.DeleteTable(command.SchemaName, command.TableName);
break;
case MigrationOperation.AlterTableName:
_storeDatabaseDriver.RenameTable(command.SchemaName, command.TableName, command.NewValue);
break;
case MigrationOperation.AddColumn:
_storeDatabaseDriver.AddColumn(command.SchemaName, command.TableName, command.Column);
break;
case MigrationOperation.DeleteColumn:
_storeDatabaseDriver.DeleteColumn(command.SchemaName, command.TableName, command.ColumnName, command.Column);
break;
case MigrationOperation.AlterColumnName:
_storeDatabaseDriver.RenameColumn(command.SchemaName, command.TableName, command.ColumnName, command.NewValue);
break;
case MigrationOperation.AlterColumn:
_storeDatabaseDriver.AlterColumn(command.SchemaName, command.TableName, command.Column);
break;
default:
throw new NotImplementedException();
}
}
// save to version table
var vesionRecord = new MigrationVersionEntity {
Applied = DateTime.UtcNow, Version = migration.Version, VersionKey = migration.VersionKey, NextIndex = nextIndex
};
var existingRecord = _storeDatabaseDriver.Find <MigrationVersionEntity>(schema, VERSION_TABLE, VERSION_ID, migration.Version);
if (existingRecord.Any())
{
_storeDatabaseDriver.Update(schema, vesionRecord, VERSION_TABLE);
}
else
{
_storeDatabaseDriver.Insert(schema, vesionRecord, migration.Version, VERSION_TABLE);
}
}
