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public class DatabaseDeleter
{
private readonly ISessionFactory _configuration;
private static readonly string[] _ignoredTables = new[] { "sysdiagrams", "usd_AppliedDatabaseScript" };
private static string[] _tablesToDelete;
private static string _deleteSql;
private static object _lockObj = new object();
private static bool _initialized;
public DatabaseDeleter(ISessionFactory sessionSource)
{
_configuration = sessionSource;
BuildDeleteTables();
}
private class Relationship
{
public string PrimaryKeyTable { get; private set; }
public string ForeignKeyTable { get; private set; }
}
public virtual void DeleteAllData()
{
ISession session = _configuration.OpenSession();
using (IDbCommand command = session.Connection.CreateCommand())
{
command.CommandText = _deleteSql;
command.ExecuteNonQuery();
}
}
public static string[] GetTables()
{
return _tablesToDelete;
}
private void BuildDeleteTables()
{
if (!_initialized)
{
lock (_lockObj)
{
if (!_initialized)
{
ISession session = _configuration.OpenSession();
var allTables = GetAllTables(session);
var allRelationships = GetRelationships(session);
_tablesToDelete = BuildTableList(allTables, allRelationships);
_deleteSql = BuildTableSql(_tablesToDelete);
_initialized = true;
}
}
}
}
private static string BuildTableSql(IEnumerable<string> tablesToDelete)
{
string completeQuery = "";
foreach (var tableName in tablesToDelete)
{
completeQuery += String.Format("delete from [{0}];", tableName);
}
return completeQuery;
}
private static string[] BuildTableList(ICollection<string> allTables, ICollection<Relationship> allRelationships)
{
var tablesToDelete = new List<string>();
while (allTables.Any())
{
var leafTables = allTables.Except(allRelationships.Select(rel => rel.PrimaryKeyTable)).ToArray();
tablesToDelete.AddRange(leafTables);
foreach (var leafTable in leafTables)
{
allTables.Remove(leafTable);
var relToRemove = allRelationships.Where(rel => rel.ForeignKeyTable == leafTable).ToArray();
foreach (var rel in relToRemove)
{
allRelationships.Remove(rel);
}
}
}
return tablesToDelete.ToArray();
}
private static IList<Relationship> GetRelationships(ISession session)
{
var otherquery = session.CreateSQLQuery(
@"select
so_pk.name as PrimaryKeyTable
, so_fk.name as ForeignKeyTable
from
sysforeignkeys sfk
inner join sysobjects so_pk on sfk.rkeyid = so_pk.id
inner join sysobjects so_fk on sfk.fkeyid = so_fk.id
order by
so_pk.name
, so_fk.name");
return otherquery.SetResultTransformer(Transformers.AliasToBean<Relationship>()).List<Relationship>();
}
private static IList<string> GetAllTables(ISession session)
{
var query = session.CreateSQLQuery("select name from sys.tables");
return query.List<string>().Except(_ignoredTables).ToList();
}
}
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