static string sortIndex(this iTypeSerializer ser, MemberInfo mi, out bool indexDirectionPositive, out bool multi)
{
IndexForColumn[] indices = ser.indicesFromColumn(mi);
IndexForColumn found = null;
foreach (var i in indices)
{
if (0 != i.columnIndex)
{
continue; // For sorting, the column have to be the first on the index
}
if (i.primary)
{
// Primary indices should be the best for performance
found = i;
break;
}
if (null == found)
{
found = i;
}
}
if (null == found)
{
throw new ArgumentException("No sort index found for the column {0}".formatWith(mi.Name));
}
indexDirectionPositive = found.indexDirectionPositive;
multi = mi.getColumnAttribute().isMultiValued;
return(found.indexName);
}
static SearchQuery <tRow> fullTextQuery <tRow>(iTypeSerializer ser, ParameterExpression eRecord, ParameterExpression eArgument, Expression eLeft, Expression eRight, int argsCount) where tRow : new()
{
HasParam hp = new HasParam(eRecord);
bool leftParam = hp.hasParameter(eLeft);
if (!leftParam)
{
throw new NotSupportedException("Full-text queries must have column as the first argument");
}
MemberInfo column = parseColumn(eRecord, eLeft);
bool rightParam = hp.hasParameter(eRight);
if (rightParam)
{
throw new NotSupportedException("Full-text queries can't include column in the second argument");
}
Func <object, object> arg = parseConstant(eArgument, eRight);
IndexForColumn[] inds = ser.indicesFromColumn(column);
IndexForColumn ind = inds.FirstOrDefault(i => i.columnIndex == 0 && i.attrib is Attributes.EseTupleIndexAttribute);
if (null == ind)
{
throw new NotSupportedException("Failed to parse full-text search query: no suitable index found");
}
string indName = ind.indexName;
Action <Recordset <tRow>, object> act = (rs, a) => rs.filterFindSubstring(indName, arg(a));
return(new SearchQuery <tRow>(act, argsCount, true));
}
/// <summary>Compile query to sort the table by the index.</summary>
public static SortQuery <tRow> sort <tRow, tKey>(iTypeSerializer ser, Expression <Func <tRow, tKey> > exp, bool descending) where tRow : new()
{
var me = exp.Body as MemberExpression;
if (null == me)
{
throw new NotSupportedException("Currently, orderBy[Descending] only supports ordering by a single column.");
}
IndexForColumn[] indices = ser.indicesFromColumn(me.Member);
bool indexDirectionPositive, multi;
string ind = ser.sortIndex(me.Member, out indexDirectionPositive, out multi);
bool shouldInvert = descending ^ (!indexDirectionPositive);
return(new SortQuery <tRow>(r => r.filterSort(ind, shouldInvert), multi));
}
/// <summary>Look up the ESENT indices</summary>
public void lookupIndices(iTypeSerializer ser)
{
indices = ser.indicesFromColumn(column);
}
