public bool DeleteOldMessages(UserVO from, UserVO to)
{
List <MessageVO> m = GetMessages(from, to);
if (m.Count <= ConfigurationManager.MAXIMUM_MESSAGES_COUNT)
{
return(true);
}
m.Sort(new MessageSorter());
int firstOldMessageIndex = m.Count - 1 - ConfigurationManager.MAXIMUM_MESSAGES_COUNT;
MessageVO firstOldMessage = m[firstOldMessageIndex];
DateTime toDeleteDate = firstOldMessage.Date;
string condition = string.Format("({0} <= @{0} and {1}=@{1} and {2}=@{2})", messageDate, messageFrom, messageTo);
string statement = SqlStatememtGenerator.Delete_ByCondition(tableName, condition);
SqlCeParameter[] parameters =
{
MakeSqlParameter(messageDate, toDeleteDate, SqlDbType.DateTime),
MakeSqlParameter(messageFrom, from.Id),
MakeSqlParameter(messageTo, to.Id)
};
return(executer.ExecuteDeleteStatement(statement, parameters));
}
private bool DeleteAssociationsOfTableElement(VO tableElement, string providedTableColumnName)
{
string condition = string.Format("{0} = @{0}", providedTableColumnName);
string statement = SqlStatememtGenerator.Delete_ByCondition(tableName, condition);
SqlCeParameter[] parameters = new SqlCeParameter[] { MakeSqlParameter(providedTableColumnName, tableElement.Id) };
return(executer.ExecuteDeleteStatement(statement, parameters));
}
public bool Detach(T1 firstTableVO, T2 secondTableVO)
{
string condition = string.Format("{0} = @{0} and {1} = @{1}", firstTableIdColumnName, secondTableIdColumnName);
string statement = SqlStatememtGenerator.Delete_ByCondition(tableName, condition);
SqlCeParameter[] parameters = new SqlCeParameter[2];
parameters[0] = MakeSqlParameter(firstTableIdColumnName, firstTableVO.Id);
parameters[1] = MakeSqlParameter(secondTableIdColumnName, secondTableVO.Id);
return(executer.ExecuteDeleteStatement(statement, parameters));
}
public virtual bool DeleteAll()
{
string statement = SqlStatememtGenerator.Delete_ByCondition(tableName, "1=1");
return executer.ExecuteDeleteStatement(statement, null);
}
