/// <summary>
/// procedure are in 2 stages, stage 1 apply raw Where Clause to get data interested
/// stage 2, apply evaluation strategy to get the overall result
///
/// PS:for simple 1 table select, do the original sql query over all possible worlds of
/// this table in PD, and return results in the descending order of probability
/// </summary>
/// <param name="isIntermediateResult"> </param>
public DataTable HandleSelectSqlQuery(bool isIntermediateResult)
{
if (_query.HasSubquery)
{
var table1 = _query.TableName;
int attributeSize = PreparePossibleStatesTable(table1);
CreatePossibleWorldsTable(table1, attributeSize);
PreparePossibleWorldsTable(table1);
PreparePossibleWorldsAggregatedTable(table1);
var subQueryHandler = new SelectQueryHandler(_query.SubQuery, underlineDatabase);
var table2 = subQueryHandler.HandleSelectSqlQuery(true);
var attributeSelected = AttbutesWithoutRenaming(_query.Attributes);
JoinPossibleWorlds(table1 + "_PossibleWorlds", "subquery_PossibleWorlds", "answer_PossibleWorlds",
_query.JoinOnAttributes, attributeSelected);
JoinPossibleWorldsAggregatedTable(table1 + "_PossibleWorldsAggregated", "subquery_PossibleWorldsAggregated", "answer_PossibleWorldsAggregated");
DataTable result = NaiveStrategy(_query.Attributes, _query.ConditionClause, "answer", isIntermediateResult);
return(result);
}
else
{
// no more subquery/join, now just consider a single table
var answerTableName = "needToGetRidOfThisVariable";
DataTable result = ComputeJointResultUsingNaiveStrategy(_query.Attributes, _query, isIntermediateResult);
return(result);
}
}
public string submitQuerySQL(string sql, out DataTable answerSet)
{
SqlQuery rawQuery = new SqlQuery(sql);
QueryType qType = rawQuery.ProcessType();
answerSet = null;
switch (qType)
{
case QueryType.INSERT:
var query = new SqlInsertQuery(sql);
query.ProcessAndPopulateEachField();
var iHandler = new InsertQueryHandler(query, underlineDatabase);
answerSet = iHandler.HandleInsertQuery();
break;
case QueryType.SELECT:
var squery = new SqlSelectQuery(sql);
var sHandler = new SelectQueryHandler(squery, underlineDatabase);
answerSet = sHandler.HandleSelectSqlQuery();
break;
case QueryType.CREATE:
var cquery = new SqlCreateTableQuery(sql);
var handler = new CreateTableHandler(cquery,underlineDatabase);
answerSet = handler.HandleCreateTableQuery();
break;
default:
break;
}
return "end of submitSQL function";
}
private void PreparePossibleTables(string tName)
{
SelectQueryHandler queryHandler = new SelectQueryHandler(null, _underlineDatabase);
var tables = new List<string>();
tables.Add(tName);
queryHandler.PrepareReleventTables(tables);
}
/// <summary>
/// procedure are in 2 stages, stage 1 apply raw Where Clause to get data interested
/// stage 2, apply evaluation strategy to get the overall result
///
/// PS:for simple 1 table select, do the original sql query over all possible worlds of
/// this table in PD, and return results in the descending order of probability
/// </summary>
/// <param name="isIntermediateResult"> </param>
public DataTable HandleSelectSqlQuery(bool isIntermediateResult)
{
if (_query.HasSubquery)
{
var table1 = _query.TableName;
int attributeSize = PreparePossibleStatesTable(table1);
CreatePossibleWorldsTable(table1, attributeSize);
PreparePossibleWorldsTable(table1);
PreparePossibleWorldsAggregatedTable(table1);
var subQueryHandler = new SelectQueryHandler(_query.SubQuery, underlineDatabase);
var table2 = subQueryHandler.HandleSelectSqlQuery(true);
var attributeSelected = AttbutesWithoutRenaming(_query.Attributes);
JoinPossibleWorlds(table1 + "_PossibleWorlds", "subquery_PossibleWorlds", "answer_PossibleWorlds",
_query.JoinOnAttributes, attributeSelected);
JoinPossibleWorldsAggregatedTable(table1+"_PossibleWorldsAggregated", "subquery_PossibleWorldsAggregated", "answer_PossibleWorldsAggregated");
DataTable result = NaiveStrategy(_query.Attributes, _query.ConditionClause, "answer",isIntermediateResult);
return result;
}
else
{
// no more subquery/join, now just consider a single table
var answerTableName = "needToGetRidOfThisVariable";
DataTable result = ComputeJointResultUsingNaiveStrategy(_query.Attributes, _query,isIntermediateResult);
return result;
}
}
