public void GenerateMigrationScripts()
{
int count = 0;
string outputPath = ConfigurationManager.AppSettings["SQLOutputFolder"];
outputPath = Path.Combine(outputPath, DateTime.Now.ToString("ddMMyyyy"));
List<string> scriptNames = new List<string>();
var temp = new List<string>();
while (count < _destinationDatabase.Tables.Count)
{
DestinationTable destinationTable = null;
SourceTable sourceTable = null;
try
{
// Get next table to migrate
destinationTable = GetNextTableCanMap();
if (destinationTable == null)
break;
Console.WriteLine("Processing " + destinationTable.Name);
// Check explicit mapping for source table - destination table
TableMappingDefinition mappingDefinition;
TableMappingConfiguration mappingConfig = GetTableMappingConfig(destinationTable.Name);
sourceTable = GetSourceTable(destinationTable.Name, mappingConfig);
if(mappingConfig != null)
{
mappingDefinition = new TableMappingDefinition(sourceTable, destinationTable, mappingConfig.FieldMappings);
mappingDefinition.IsIdentityInsert = mappingConfig.IsIdentityInsert;
}
else
{
mappingDefinition = new TableMappingDefinition(sourceTable, destinationTable);
}
// Retain mapping definition for later use
_tableMappingDefinitions.Add(mappingDefinition);
// Check circle references needed to update
CheckCircleReferences(destinationTable, mappingDefinition);
// Generate script
var scriptGenerator = new TableScriptGenerator(_sourceDatabase, mappingDefinition);
var script = scriptGenerator.GenerateScript();
var fileName = string.Format("{0}.{1}-{2}.sql", count++, sourceTable.Name, destinationTable.Name);
Utils.SaveToFile(outputPath, fileName, script);
scriptNames.Add(fileName);
temp.Add(destinationTable.Name);
destinationTable.IsMapped = true;
}
catch (MigrationException ex)
{
if (ex.ErrorCode == MigrationExceptionCodes.DATABASE_ERROR_TABLE_NOT_FOUND)
{
destinationTable.IsMapped = true;
// TODO: write log
Console.WriteLine(destinationTable.Name + " not mapped");
}
}
}
// Generate script clear temp database
var clearScript = string.Format(SqlScriptTemplates.TRUNCATE_TABLE, "[TempDatabase].dbo.[TrackingRecords]");
var clearFileName = string.Format("{0}.Clear.sql", count);
Utils.SaveToFile(outputPath, clearFileName, clearScript);
scriptNames.Add(clearFileName);
// Generate bat file
string batScript = BatGenerator.GenerateSqlExecuteScript(scriptNames, _options.ServerName, _options.InstanceName, outputPath);
Utils.SaveToFile(outputPath, "RunMigration.bat", batScript);
}
public TableScriptGenerator(SourceDatabase sourceDatabase, TableMappingDefinition definition)
{
_sourceDatabase = sourceDatabase;
_definition = definition;
}
private void CheckCircleReferences(Table table, TableMappingDefinition mappingDefinition)
{
if (_tablesToUpdateCircleReferences.ContainsKey(table.Name))
{
_tablesToUpdateCircleReferences[table.Name].ForEach(r =>
{
TableMappingDefinition temp = _tableMappingDefinitions.Single(d => d.DestinationTable.Name.Equals(r.OriginTableName));
FieldMappingDefinition fieldMappingDefinition = temp.FieldMappingDefinitions.SingleOrDefault(f => f.DestinationField.Name.Equals(r.OriginFieldName));
if(fieldMappingDefinition != null)
{
SourceTable sourceTable = temp.SourceTable;
Field sourceField = fieldMappingDefinition.SourceField;
DestinationTable destinationTable = temp.DestinationTable;
Field destinationField = fieldMappingDefinition.DestinationField;
FieldMappingInfo info = new FieldMappingInfo
{
DestinationField = destinationField,
DestinationTable = destinationTable,
SourceField = sourceField,
SourceTable = sourceTable
};
mappingDefinition.CircleReferences.Add(info);
}
});
}
}
