public void NormalizeQuerySpecification(QuerySpecification qs)
{
foreach (var sq in qs.EnumerateSubqueries())
{
NormalizeSelectStatement(sq.SelectStatement);
}
// Process join conditions
conditions = new List <LogicalExpressions.Expression>();
var from = qs.FindDescendant <FromClause>();
if (from != null)
{
var tablesource = from.FindDescendant <TableSourceExpression>();
foreach (JoinedTable jt in tablesource.EnumerateDescendantsRecursive <JoinedTable>(typeof(Subquery)))
{
// CROSS JOIN queries have no search condition
SearchCondition sc = jt.FindDescendant <SearchCondition>();
if (sc != null)
{
conditions.Add(GetConjunctiveNormalForm(sc));
}
}
}
// Process where clause
WhereClause where = qs.FindDescendant <WhereClause>();
if (where != null)
{
var sc = where.FindDescendant <SearchCondition>();
conditions.Add(GetConjunctiveNormalForm(sc));
}
}
/// <summary>
/// Looks for a * in the select list and throws an exception if there's any
/// </summary>
/// <param name="qs"></param>
protected void ValidateStarInSelectList(QuerySpecification qs)
{
// Look for stars (*) in the select list
foreach (var i in qs.FindDescendant <SelectList>().Nodes)
{
if (i is Mul)
{
throw CreateException(ExceptionMessages.StarColumnNotAllowed, i);
}
}
}
protected void ValidateQuerySpecification(QuerySpecification qs)
{
// Call recursively for subqueries
#if false
foreach (var sq in qs.EnumerateSubqueries())
{
ValidateQuerySpecification(sq);
}
#endif
ValidateTableReferences(qs);
ValidateStarInSelectList(qs);
// Loop through all column expressions of the select list and try to resolve them
foreach (ColumnExpression ce in qs.FindDescendant <SelectList>().EnumerateDescendants <ColumnExpression>())
{
ValidateColumnExpression(qs, ce);
}
}
public void NormalizeQuerySpecification(QuerySpecification qs)
{
foreach (var sq in qs.EnumerateSubqueries())
{
NormalizeSelectStatement(sq.SelectStatement);
}
// Process join conditions
conditions = new List<LogicalExpressions.Expression>();
var from = qs.FindDescendant<FromClause>();
if (from != null)
{
var tablesource = from.FindDescendant<TableSourceExpression>();
foreach (JoinedTable jt in tablesource.EnumerateDescendantsRecursive<JoinedTable>(typeof(Subquery)))
{
// CROSS JOIN queries have no search condition
SearchCondition sc = jt.FindDescendant<SearchCondition>();
if (sc != null)
{
conditions.Add(GetConjunctiveNormalForm(sc));
}
}
}
// Process where clause
WhereClause where = qs.FindDescendant<WhereClause>();
if (where != null)
{
var sc = where.FindDescendant<SearchCondition>();
conditions.Add(GetConjunctiveNormalForm(sc));
}
}
private void AppendPartitioningConditions(QuerySpecification qs, SimpleTableSource ts)
{
if (!double.IsInfinity(PartitioningKeyFrom) || !double.IsInfinity(PartitioningKeyTo))
{
var cg = new SqlServerCodeGenerator();
string format;
if (double.IsInfinity(PartitioningKeyFrom) && double.IsInfinity(PartitioningKeyTo))
{
format = "{1} <= {0} AND {0} < {2}";
}
else if (double.IsInfinity(PartitioningKeyFrom))
{
format = "{0} < {2}";
}
else
{
format = "{1} <= {0}";
}
string sql = String.Format(format,
cg.GetResolvedColumnName(ts.PartitioningColumnReference),
PartitioningKeyFrom.ToString(System.Globalization.CultureInfo.InvariantCulture),
PartitioningKeyTo.ToString(System.Globalization.CultureInfo.InvariantCulture));
var parser = new Jhu.Graywulf.SqlParser.SqlParser();
var sc = (SearchCondition)parser.Execute(new SearchCondition(), sql);
var where = qs.FindDescendant<WhereClause>();
if (where == null)
{
where = WhereClause.Create(sc);
var ws = Whitespace.Create();
var wsn = qs.Stack.AddAfter(qs.Stack.Find(qs.FindDescendant<FromClause>()), ws);
qs.Stack.AddAfter(wsn, where);
}
else
{
where.AppendCondition(sc, "AND");
}
}
// --- remove partition clause
ts.Stack.Remove(ts.FindDescendant<TablePartitionClause>());
}
/// <summary>
/// Looks for a * in the select list and throws an exception if there's any
/// </summary>
/// <param name="qs"></param>
protected void ValidateStarInSelectList(QuerySpecification qs)
{
// Look for stars (*) in the select list
foreach (var i in qs.FindDescendant<SelectList>().Nodes)
{
if (i is Mul)
{
throw CreateException(ExceptionMessages.StarColumnNotAllowed, i);
}
}
}
protected void ValidateQuerySpecification(QuerySpecification qs)
{
// Call recursively for subqueries
#if false
foreach (var sq in qs.EnumerateSubqueries())
{
ValidateQuerySpecification(sq);
}
#endif
ValidateTableReferences(qs);
ValidateStarInSelectList(qs);
// Loop through all column expressions of the select list and try to resolve them
foreach (ColumnExpression ce in qs.FindDescendant<SelectList>().EnumerateDescendants<ColumnExpression>())
{
ValidateColumnExpression(qs, ce);
}
}
