public IEnumerable <T> Select(QParam param, IEnumerable <T> list = null)
{
if (param.ValueLeft is QFunc func &&
func.Type == QFunctionType.distinct &&
func.Items.FirstOrDefault() is QItem item)
{
return(ListHelper.Distinct(list ?? items, item, param.Query?.GetComparer()));//
}
IEnumerable <T> buf = param.IsCompaund ? Select(param.Parameters, list) : null;
if (buf == null)
{
if (param.ValueLeft is QColumn)
{
buf = Select(param.Column, param.Comparer, param.Value, list);
}
else if (param.ValueLeft is QReflection)
{
buf = Select(((QReflection)param.ValueLeft).Invoker, param.Comparer, param.Value, list);
}
else
{
buf = Search(param, list);
}
}
return(buf);
}
public QEnum(IList list, DBColumn column = null) : this()
{
foreach (var item in list)
{
if (item is QItem)
{
items.Add((QItem)item);
}
else
{
items.Add(QParam.Fabric(item, column));
}
}
}
public IEnumerable <T> Search(QParam param, IEnumerable <T> list = null)
{
list = list ?? this;
foreach (T row in list)
{
if (param.ValueLeft == null || param.ValueRight == null)
{
}
if (CheckItem(row, param.ValueLeft.GetValue(row), param.ValueRight.GetValue(row), param.Comparer))
{
yield return(row);
}
}
}
public DBTableView(DBTable <T> table, QParam defaultFilter, DBViewKeys mode = DBViewKeys.None, DBStatus statusFilter = DBStatus.Empty)
{
propertyHandler = null;
this.table = table;
FilterQuery = new Query <T>();
Query = new QQuery();
TypeFilter = typeof(T);
DefaultParam = defaultFilter;
StatusFilter = statusFilter;
keys = mode;
table.AddView(this);
if ((keys & DBViewKeys.Empty) != DBViewKeys.Empty)
{
UpdateFilter();
}
}
public IEnumerable <T> Select(QItemList <QParam> parameters, IEnumerable <T> list = null)
{
IEnumerable <T> buffer = null;
for (int i = 0; i < parameters.Count; i++)
{
QParam param = parameters[i];
if (buffer != null && param.Logic.Type == LogicTypes.And)
{
if (!buffer.Any())
{
break;
}
list = buffer;
}
var temp = Select(param, list);
if (buffer == null)
{
buffer = temp;
}
else if (param.Logic.Type == LogicTypes.Undefined)
{
buffer = buffer.Concat(temp);
}
else if (param.Logic.Type == LogicTypes.Or)
{
buffer = param.Logic.Not
? buffer.Except(temp)
: buffer.Union(temp);
}
else if (param.Logic.Type == LogicTypes.And)
{
buffer = param.Logic.Not
? buffer.Except(temp).Union(temp.Except(buffer))
: buffer.Intersect(temp);
}
}
return(buffer);
}
public IEnumerable <T> Select(QParam param, IEnumerable <T> list = null)
{
IEnumerable <T> buf = Select(param.Parameters, list);
if (buf == null)
{
if (param.ValueLeft is QColumn)
{
buf = Select(param.Column, param.Comparer, param.Value, list);
}
else if (param.ValueLeft is QReflection)
{
buf = Select(((QReflection)param.ValueLeft).Invoker, param.Comparer, param.Value, list);
}
else
{
buf = Search(param, list);
}
}
return(buf);
}
public DBTableView(QParam defaultFilter, DBViewKeys mode = DBViewKeys.None, DBStatus statusFilter = DBStatus.Empty)
: this(DBTable.GetTable <T>(null, false), defaultFilter, mode, statusFilter)
{
}
private void CheckFilterQuery()
{
ClearFilter();
foreach (var filter in FilterQuery.Parameters)
{
if (filter.Invoker == null ||
filter.Value == null ||
filter.Value == DBNull.Value ||
filter.Value.ToString().Length == 0)
{
if (filter.Comparer.Type != CompareTypes.Is)
{
continue;
}
}
var pcolumn = filter.Invoker as DBColumn;
if (filter.Invoker.Name == nameof(Object.ToString))
{
Query.SimpleFilter(filter.Value as string);
}
else if (pcolumn != null)
{
string code = pcolumn.Name;
QParam param = new QParam()
{
Column = pcolumn,
Logic = filter.Logic,
Comparer = filter.Comparer,
Value = filter.Comparer.Type != CompareTypes.Is ? filter.Value : null
};
if (param.Value is string && param.Comparer.Type == CompareTypes.Like)
{
string s = (string)param.Value;
if (s.IndexOf('%') < 0)
{
param.Value = string.Format("%{0}%", s);
}
}
int i = code.IndexOf('.');
if (i >= 0)
{
int s = 0;
QQuery sexpression = Query;
QQuery newQuery = null;
while (i > 0)
{
string iname = code.Substring(s, i - s);
if (s == 0)
{
var pc = table.Columns[iname];
if (pc != null)
{
iname = pc.Name;
}
}
var c = sexpression.Table.Columns[iname];
if (c.IsReference)
{
newQuery = new QQuery(string.Empty, c.ReferenceTable);
sexpression.BuildParam(c, CompareType.In, newQuery);
sexpression = newQuery;
}
s = i + 1;
i = code.IndexOf('.', s);
}
newQuery.Parameters.Add(param);
}
else
{
Query.Parameters.Add(param);//.BuildParam(col, column.Value, true);
}
}
else
{
var param = new QParam()
{
ValueLeft = new QReflection(filter.Invoker),
Logic = filter.Logic,
Comparer = filter.Comparer,
Value = filter.Comparer.Type != CompareTypes.Is ? filter.Value : null
};
Query.Parameters.Add(param);
}
}
}
