public void Update <T>(T Val) where T : class
{
Open();
DbEntry ValEntry = Val as DbEntry;
List <SQLiteParameter> Params = new List <SQLiteParameter>();
FieldInfo[] Fields = DALFieldAttribute.GetDALFields <T>();
foreach (var F in Fields)
{
DALFieldAttribute DALField = F.GetCustomAttribute <DALFieldAttribute>();
Params.Add(ValEntry.CreateParameter(DALField.ColumnName));
}
using (SQLiteCommand SQL = Con.CreateCommand()) {
string NewValues = string.Join(", ", Params.Select(C => C.ParameterName.Substring(1) + " = " + C.ParameterName));
string Conditions = string.Join(", ", Params.Select(C => C.ParameterName));
SQL.CommandText = string.Format("UPDATE {0} SET {1} WHERE id = @id", DALTableAttribute.GetTableName <T>(), NewValues);
SQL.Parameters.Add(ValEntry.CreateParameterID());
SQL.Parameters.AddRange(Params.ToArray());
SQL.ExecuteNonQuery();
}
Close();
}
IEnumerable <T> Select <T>(string TableName, SQLiteParameter[] Conditions, QueryMode Mode = QueryMode.AND) where T : DbEntry, new()
{
DataTable Table = Query(TableName, Conditions, Mode);
int RowCount = Table.Rows.Count;
FieldInfo[] Fields = DALFieldAttribute.GetDALFields <T>();
for (int i = 0; i < RowCount; i++)
{
T Obj = new T();
for (int j = 0; j < Fields.Length; j++)
{
string Name = Fields[j].GetCustomAttribute <DALFieldAttribute>().ColumnName;
object ColVal = Table.Rows[i][Name];
if (ColVal is DBNull)
{
ColVal = null;
}
Type FT = Fields[j].FieldType;
if (ColVal != null && ColVal.GetType() != FT)
{
Type Underlying;
if ((Underlying = Nullable.GetUnderlyingType(FT)) != null)
{
if (ColVal != null)
{
ColVal = Convert.ChangeType(ColVal, Underlying);
ColVal = Activator.CreateInstance(FT, new[] { ColVal });
}
}
else
{
ColVal = Convert.ChangeType(ColVal, FT);
}
}
Fields[j].SetValue(Obj, ColVal);
}
yield return(Obj);
}
yield break;
}
public SQLiteParameter CreateParameter(string Name)
{
FieldInfo[] Fields = DALFieldAttribute.GetDALFields(GetType());
for (int i = 0; i < Fields.Length; i++)
{
DALFieldAttribute DALField = Fields[i].GetCustomAttribute <DALFieldAttribute>();
if (DALField.ColumnName == Name)
{
return(new SQLiteParameter("@" + Name, Fields[i].GetValue(this)));
}
}
throw new Exception(string.Format("Field {0} not found in {1}", Name, GetType().Name));
}
void Insert <T>(string TableName, T Val) where T : DbEntry
{
Open();
List <SQLiteParameter> ValueColumns = new List <SQLiteParameter>();
FieldInfo[] Fields = DALFieldAttribute.GetDALFields <T>();
foreach (var F in Fields)
{
DALFieldAttribute DALField = F.GetCustomAttribute <DALFieldAttribute>();
if (DALField.ColumnName == "id")
{
continue;
}
object ObjVal = F.GetValue(Val);
if (ObjVal != null)
{
SQLiteParameter Param = new SQLiteParameter("@" + DALField.ColumnName);
Param.Value = ObjVal;
ValueColumns.Add(Param);
}
}
using (SQLiteCommand SQL = Con.CreateCommand()) {
string ParamNames = string.Join(", ", ValueColumns.Select(C => C.ParameterName.Substring(1)));
string ParamValues = string.Join(", ", ValueColumns.Select(C => C.ParameterName));
SQL.CommandText = string.Format("INSERT INTO {0}({1}) VALUES({2})", TableName, ParamNames, ParamValues);
SQL.Parameters.AddRange(ValueColumns.ToArray());
SQL.ExecuteNonQuery();
}
Close();
using (DataTable DT = Query(TableName, null, QueryMode.AND, 1)) {
int ID = (int)DT.Rows[0].Field <long>("id");
typeof(T).GetField("ID").SetValue(Val, ID);
}
}
