/// <summary>
/// Builds the SQL statement.
/// </summary>
/// <returns></returns>
public string BuildSqlStatement(MigrationDirection direction)
{
if (Provider == null)
{
Provider = DataService.Provider;
}
ISqlGenerator generator = DataService.GetGenerator(Provider);
StringBuilder sql = new StringBuilder();
// based on direction build migration steps only when dealing with a
// decendent class, there is no overridden Up or Down if doing a
// migrate on dispose style so the step.Clear() would destroy all
// our hard work.
if (!migrateOnDispose)
{
steps.Clear();
switch (direction)
{
case MigrationDirection.Up:
Up();
break;
case MigrationDirection.Down:
Down();
break;
}
}
//build sql
foreach (MigrationStep step in steps)
{
switch (step.StepType)
{
case MigrationStepType.CreateTable:
// need to make sure this table has a pk defined
// if not, add one
// we'll do yer job for ya :)
if (step.Table.PrimaryKey == null)
{
step.Table.AddPrimaryKeyColumn();
}
sql.Append(generator.BuildCreateTableStatement(step.Table));
break;
case MigrationStepType.DropTable:
sql.Append(generator.BuildDropTableStatement(step.Table));
break;
case MigrationStepType.AddForeignKey:
sql.Append(generator.BuildForeignKeyStatement(step.Column, step.Column2));
break;
case MigrationStepType.DropForeignKey:
sql.Append(generator.BuildForeignKeyDropStatement(step.Column, step.Column2));
break;
case MigrationStepType.AddColumn:
sql.Append(generator.BuildAddColumnStatement(step.Table, step.Column));
break;
case MigrationStepType.AlterColumn:
sql.Append(generator.BuildAlterColumnStatement(step.Column));
break;
case MigrationStepType.DropColumn:
sql.Append(generator.BuildDropColumnStatement(step.Table, step.Column));
break;
case MigrationStepType.ExecuteSql:
sql.Append(step.Sql);
break;
default:
break;
}
sql.Append(";\r\n");
}
return(sql.ToString());
}