private VolumeItem[] _SearchItem(ISearchCriteria searchCriteria)
{
// TODO : check SQL output! implemetation was rewritten from scratch!!
// TODO : VolumeDatabase shouln't hardcode fieldnames or tablenames
//const string ORDER_FIELD = "Items.VolumeID"; // slows down searching drastically
/*** build sql query ***/
string condition = searchCriteria.GetSqlSearchCondition();
if (condition.Length == 0) // e.g. empty SearchCriteriaGroup
{
throw new ArgumentException("SearchCriteria is empty", "searchCriteria");
}
string sqlQuery;
if ((searchCriteria.SearchCriteriaType & SearchCriteriaType.VolumeSearchCriteria) == SearchCriteriaType.VolumeSearchCriteria)
{
// searchriteria contains volume searchriteria -> join volumes table
sqlQuery = string.Format("SELECT Items.* FROM Items, Volumes WHERE ({0}) AND (Items.VolumeID = Volumes.VolumeID);", condition);
}
else
{
//sqlQuery = string.Format("SELECT * FROM Items WHERE {0} ORDER BY {1};", condition, ORDER_FIELD);
sqlQuery = string.Format("SELECT * FROM Items WHERE {0};", condition);
}
if (Global.EnableDebugging)
{
Debug.WriteLine(string.Format("_SearchItem() executes query: '{0}'", sqlQuery));
}
return(QueryItems <VolumeItem>(sqlQuery, searchItemResultsLimit));
}
private Volume[] _SearchVolume(ISearchCriteria searchCriteria)
{
// TODO : check SQL output! implemetation was rewritten from scratch!!
// TODO : VolumeDatabase shouln't hardcode fieldnames or tablenames
// TODO : Volume.TableName, Volume.IDField?
//const string ORDER_FIELD = "Volumes.VolumeID"; // slows down searching
/*** build sql query ***/
string sqlQuery;
//sqlQuery = string.Format("SELECT * FROM Volumes WHERE {0} ORDER BY {1};", condition, ORDER_FIELD);
if (searchCriteria == null)
{
// when searching volumes, the searchcriteria may be optional
// since the resultset can not become as big as in in item searches.
// apart from that there must be a way to retrieve all volumes in the database.
sqlQuery = "SELECT * FROM Volumes;";
}
else
{
string condition = searchCriteria.GetSqlSearchCondition();
if (condition.Length == 0) // e.g. empty SearchCriteriaGroup
{
throw new ArgumentException("SearchCriteria is empty", "searchCriteria");
}
if ((searchCriteria.SearchCriteriaType & SearchCriteriaType.ItemSearchCriteria) == SearchCriteriaType.ItemSearchCriteria)
{
// searchriteria contains item searchriteria -> join items table
sqlQuery = string.Format("SELECT DISTINCT Volumes.* FROM Volumes, Items WHERE ({0}) AND (Volumes.VolumeID = Items.VolumeID);", condition);
}
else
{
sqlQuery = string.Format("SELECT * FROM Volumes WHERE {0};", condition);
}
}
if (Global.EnableDebugging)
{
Debug.WriteLine(string.Format("_SearchVolume() executes query: '{0}'", sqlQuery));
}
return(QueryVolumes(sqlQuery));
}
string ISearchCriteria.GetSqlSearchCondition()
{
return(string.Format("NOT ({0})", searchCriteria.GetSqlSearchCondition()));
}
string ISearchCriteria.GetSqlSearchCondition()
{
return(searchCriteria.GetSqlSearchCondition());
}