public DbRef GetEmptyRef(String tableName)
{
DbRef r;
if (!_emptyRefs.TryGetValue(tableName, out r))
{
r = new DbRef(tableName, Guid.Empty);
_emptyRefs.Add(tableName, r);
}
return r;
}
public IEntity GetObject(DbRef r)
{
EntityType t;
if (!_types.TryGetValue(r.TableName, out t))
{
t = EntityFactory.FindType(r.TableName);
_types.Add(r.TableName, t);
}
return _db.SelectById(t, r.ToString(CultureInfo.InvariantCulture));
}
public DbRef GetRef(String tableName, Guid id)
{
DbRef r;
if (id.Equals(Guid.Empty))
r = GetEmptyRef(tableName);
else
{
if (!_refs.TryGetValue(id, out r))
{
r = new DbRef(tableName, id);
_refs.Add(id, r);
}
}
return r;
}
public void RollbackTransaction()
{
var toRemoveFromCache = new List <Guid>();
var modified = new Dictionary <string, List <string> >();
var inserted = new Dictionary <string, List <string> >();
Exec(string.Format("SELECT [Id], [TableName], [Status] FROM {0} ORDER BY [TableName]", TranStatusTable), cmd =>
{
using (SqliteDataReader r = cmd.ExecuteReader())
{
while (r.Read())
{
String id = r.GetString(0);
String tableName = r.GetString(1);
Operation status = (Operation)r.GetInt16(2);
Dictionary <String, List <String> > dict = status != Operation.Insert ? modified : inserted;
List <String> ids;
if (!dict.TryGetValue(tableName, out ids))
{
ids = new List <string>();
dict.Add(tableName, ids);
}
ids.Add(id);
}
}
});
using (SqliteTransaction tran = ActiveConnection.BeginTransaction())
{
try
{
foreach (KeyValuePair <String, List <String> > pair in modified)
{
String ids = "";
foreach (String s in pair.Value)
{
ids = ids + (String.IsNullOrEmpty(ids) ? String.Format("'{0}'", s) : String.Format(",'{0}'", s));
toRemoveFromCache.Add(DbRef.FromString(s).Id);
}
Exec(string.Format("INSERT OR REPLACE INTO _{0} SELECT * FROM __{0} WHERE [Id] IN ({1})", pair.Key, ids)
, cmd =>
{
cmd.Transaction = tran;
cmd.ExecuteNonQuery();
});
Exec(string.Format("DELETE FROM __{0}", pair.Key), cmd =>
{
cmd.Transaction = tran;
cmd.ExecuteNonQuery();
});
}
foreach (KeyValuePair <String, List <String> > pair in inserted)
{
string ids = "";
foreach (string s in pair.Value)
{
ids = ids + (String.IsNullOrEmpty(ids) ? String.Format("'{0}'", s) : String.Format(",'{0}'", s));
toRemoveFromCache.Add(DbRef.FromString(s).Id);
}
Exec(string.Format("DELETE FROM _{0} WHERE [Id] IN ({1})", pair.Key, ids), cmd =>
{
cmd.Transaction = tran;
cmd.ExecuteNonQuery();
});
}
Exec(string.Format("DELETE FROM {0}", TranStatusTable), cmd =>
{
cmd.Transaction = tran;
cmd.ExecuteNonQuery();
});
tran.Commit();
_cache.Clear(toRemoveFromCache);
}
catch
{
tran.Rollback();
throw;
}
}
}
private void ProcessAllInternal(IEnumerable <IEntity> data, ProcessMode mode, SqliteTransaction tran, bool inTran)
{
string[] columns = null;
var cmd = new SqliteCommand[4];
String tableName = null;
lock (_dbsync)
try
{
foreach (IEntity obj in data)
{
if (cmd[(int)Operation.Insert] == null)
{
IEntityType type = obj.EntityType;
columns = GetColumns(type);
String fNames = "";
String fParameters = "";
String fFields = "";
foreach (string column in columns)
{
if (!String.IsNullOrEmpty(fNames))
{
fNames = fNames + ",";
fParameters = fParameters + ",";
fFields = fFields + ",";
}
fNames = fNames + column;
fParameters = fParameters + "@" + column;
fFields = fFields + String.Format("[{0}] = @{0}", column);
}
fNames = fNames + ",IsTombstone,IsDirty";
fParameters = fParameters + ",@IsTombstone,@IsDirty";
fFields = fFields + ",[IsTombstone] = @IsTombstone, [IsDirty] = @IsDirty";
tableName = type.TableName;
cmd[(int)Operation.Insert] = new SqliteCommand(String.Format("INSERT INTO [_{0}]({1}) VALUES({2})", tableName, fNames, fParameters), ActiveConnection, tran);
cmd[(int)Operation.Update] = new SqliteCommand(String.Format("UPDATE [_{0}] SET {1} WHERE [Id] = @Id", tableName, fFields), ActiveConnection, tran);
foreach (string column in columns)
{
cmd[0].Parameters.Add("@" + column, _supportedTypes[GetType(type.GetPropertyType(column))].DbType);
cmd[1].Parameters.Add("@" + column, _supportedTypes[GetType(type.GetPropertyType(column))].DbType);
}
cmd[(int)Operation.Insert].Parameters.Add("@IsTombstone", DbType.Boolean);
cmd[(int)Operation.Insert].Parameters.Add("@IsDirty", DbType.Boolean);
cmd[(int)Operation.Update].Parameters.Add("@IsTombstone", DbType.Boolean);
cmd[(int)Operation.Update].Parameters.Add("@IsDirty", DbType.Boolean);
cmd[(int)Operation.Select] = new SqliteCommand(String.Format("SELECT Id FROM [_{0}] WHERE [Id] = @Id", tableName), ActiveConnection, tran);
cmd[(int)Operation.Select].Parameters.Add("@Id", DbType.String);
cmd[(int)Operation.Delete] = new SqliteCommand(String.Format("DELETE FROM [_{0}] WHERE [Id] = @Id", tableName), ActiveConnection, tran);
cmd[(int)Operation.Delete].Parameters.Add("@Id", DbType.String);
}
//row id
DbRef id;
if (mode == ProcessMode.InitialLoad || mode == ProcessMode.ServerChanges)
{
id = DbRef.CreateInstance(tableName, ((ISqliteEntity)obj).EntityId);
}
else
{
id = (DbRef)obj.GetValue(obj.EntityType.IdFieldName);
}
Operation operation = Operation.Insert; //insert
if (mode != ProcessMode.InitialLoad)
{
if (((ISqliteEntity)obj).IsTombstone)
{
operation = mode == ProcessMode.ServerChanges ? Operation.Delete : Operation.Update;
}
else
{
cmd[2].Parameters[0].Value = id;
if (cmd[2].ExecuteScalar() != null)
{
operation = Operation.Update; //update
}
}
}
//assign values
if (operation == Operation.Delete) //delete
{
cmd[(int)operation].Parameters[0].Value = id;
}
else
{
int n = 0;
foreach (string column in columns)
{
cmd[(int)operation].Parameters[n].Value = obj.GetValue(column);
n++;
}
cmd[(int)operation].Parameters[n].Value = ((ISqliteEntity)obj).IsTombstone ? 1 : 0; //IsTombstone
var entity = (ISqliteEntity)obj;
cmd[(int)operation].Parameters[n + 1].Value =
mode == ProcessMode.LocalChanges && (entity.IsNew() || entity.IsModified())
? 1 : 0; //isDirty
}
if (mode == ProcessMode.LocalChanges && inTran)
{
CopyTranObject(tran, tableName, id.ToString(), operation);
}
cmd[(int)operation].ExecuteNonQuery();
}
}
finally
{
foreach (var c in cmd)
{
if (c != null)
{
c.Dispose();
}
}
}
}
private IEnumerable <IEntity> Select(IEntityType type, bool useView, String where, params object[] arguments)
{
lock (_dbsync)
{
string[] columns = GetColumns(type);
int n;
String cmdKey = type.Name + where + useView;
SqliteCommand cmd;
if (!_commands.TryGetValue(cmdKey, out cmd))
{
String tableName = type.TableName;
String columnNames = "";
// ReSharper disable once LoopCanBeConvertedToQuery
foreach (string column in columns)
{
columnNames = columnNames + string.Format("{0}{1}", string.IsNullOrEmpty(columnNames) ? "" : ",", column);
}
if (!useView)
{
columnNames = columnNames + ",IsTombstone";
}
columnNames = columnNames + ",IsDirty";
cmd = new SqliteCommand
{
Connection = ActiveConnection,
CommandText =
String.Format("SELECT {0} FROM [{1}]{2}", columnNames, useView ? tableName : "_" + tableName,
String.IsNullOrEmpty(@where) ? "" : " " + @where)
};
n = 1;
foreach (object p in arguments)
{
cmd.Parameters.AddWithValue(String.Format("@p{0}", n), p);
n++;
}
cmd.Prepare();
_commands.Add(cmdKey, cmd);
}
else
{
for (int i = 0; i < arguments.Length; i++)
{
cmd.Parameters[i].Value = arguments[i];
}
}
var list = new List <IEntity>();
using (SqliteDataReader r = cmd.ExecuteReader())
{
if (r.HasRows)
{
while (r.Read())
{
IEntity entity = EntityFactory.CreateInstance(type);
n = 0;
foreach (string column in columns)
{
Type t = type.GetPropertyType(column);
if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable <>))
{
t = Nullable.GetUnderlyingType(t);
}
object value = r[n];
if (value is DBNull)
{
value = null;
}
else
{
if (t == typeof(IDbRef))
{
value = DbRef.FromString(value.ToString());
}
else
{
if (t == typeof(Guid))
{
Guid g;
if (!Guid.TryParse(value.ToString(), out g))
{
if (t.IsGenericType && t.GetGenericTypeDefinition() == typeof(Nullable <>))
{
value = null;
}
else
{
throw new ArgumentException(String.Format("Can't convert value '{0}' to System.Guid", value));
}
}
else
{
value = g;
}
}
else
{
value = Convert.ChangeType(value, t);
}
}
}
entity.SetValue(column, value);
n++;
}
bool isTombstone = !useView && (long)r["IsTombstone"] != 0;
var sqliteEntity = (ISqliteEntity)entity;
sqliteEntity.IsTombstone = isTombstone;
sqliteEntity.Load((long)r["IsDirty"] != 0);
list.Add(entity);
}
}
}
return(list);
}
}
public IDbRef CreateDbRef(string tableName, Guid id)
{
return(DbRef.CreateInstance(tableName, id));
}
