protected List <ColumnClause> GetColumns()
{
List <ColumnClause> res = new List <ColumnClause>();
var sExpr1 = CommonUtils.FindParentSelect(this);
if (sExpr1 == null)
{
throw new Exception("Select expression is not found");
}
var tables = sExpr1.GetTables();
for (int j = 0; j < tables.Length; j++)
{
var st = tables[j];
var t = tables[j].Table;
if (!string.IsNullOrEmpty(Prefix))
{
string tableAlias = Prefix;
if (!st.CompareWithColumn(new string[1] {
tableAlias
}))
{
continue;
}
}
var tlist = t.TableColumns;
for (int k = 0; k < tlist.Count; k++)
{
ColumnClause cc = new ColumnClause();
FieldExpr fe = new FieldExpr();
fe.Bind(tables[j], tlist[k].Name);
cc.ColumnExpression = fe;
res.Add(cc);
}
}
return(res);
}
private void FindAndMakeField()
{
FieldExpr f = this;
string tableAlias = f.TableAlias;
string fieldAlias = f.FieldName;
string schema = f.Schema;
bool ok = false;
ITableSource tsource = CommonUtils.FindParentTableSource(this);
while (tsource != null)
{
var tables = tsource.GetTables();
foreach (var st in tables)
{
bool okTable = false;
if (!string.IsNullOrEmpty(tableAlias))
{
if (st.CompareWithColumn(new string[2] {
schema, tableAlias
}))
{
okTable = true;
}
}
else
{
okTable = true;
}
if (okTable)
{
var c = st.Table.ByName(fieldAlias);
if (c != null)
{
if (ok)
{
throw new Exception("Невозможно определить однозначно колонку");
}
f.Bind(st, fieldAlias);
ok = true;
}
}
}
if (ok)
{
break;
}
if (string.IsNullOrEmpty(tableAlias) && tsource is SelectExpresion)
{
SelectExpresion select = tsource as SelectExpresion;
foreach (var c in select.TableColumns)
{
if (StringComparer.InvariantCultureIgnoreCase.Compare(c.Name, fieldAlias) == 0)
{
if (ok)
{
throw new Exception("Невозможно определить однозначно колонку");
}
ok = true;
f.Bind(select, fieldAlias);
}
}
}
if (ok)
{
break;
}
tsource = CommonUtils.FindParentTableSource(tsource);
}
if (!ok)
{
throw new Exception("Column \"" + fieldAlias + "\" is not found");
}
}