List <ColumnFragment> GetDefaultColumnsForTable(TableFragment table)
{
List <ColumnFragment> columns = new List <ColumnFragment>();
foreach (EdmProperty property in Metadata.GetProperties(table.Type.EdmType))
{
ColumnFragment col = new ColumnFragment(table.Name, property.Name);
col.PushInput(property.Name);
col.PushInput((table.Name != null) ? table.Name : table.Table);
columns.Add(col);
}
return(columns);
}
List <ColumnFragment> GetDefaultColumnsForFragment(InputFragment input)
{
List <ColumnFragment> columns = new List <ColumnFragment>();
if (input is TableFragment)
{
return(GetDefaultColumnsForTable(input as TableFragment));
}
else if (input is JoinFragment || input is UnionFragment)
{
Debug.Assert(input.Left != null);
if (input is UnionFragment)
{
generator.Ops.Push(OpType.Union);
}
columns = GetDefaultColumnsForFragment(input.Left);
if (input is JoinFragment && input.Right != null)
{
List <ColumnFragment> right = GetDefaultColumnsForFragment(input.Right);
columns.AddRange(right);
}
if (input is UnionFragment)
{
generator.Ops.Pop();
}
}
else if (input is SelectStatement)
{
SelectStatement select = input as SelectStatement;
foreach (ColumnFragment cf in select.Columns)
{
ColumnFragment newColumn = new ColumnFragment(cf.TableName,
string.IsNullOrEmpty(cf.ColumnAlias) ? cf.ActualColumnName : cf.ColumnAlias
);
if (generator.GetTopOp() == OpType.Join)
{
newColumn.ColumnAlias = cf.ColumnAlias;
newColumn.PushInput(cf.ColumnName);
if (cf.TableName != null)
{
newColumn.PushInput(cf.TableName);
}
}
else
{
newColumn.PushInput(cf.ActualColumnName);
if (cf.TableName != null && cf.ColumnAlias == null)
{
newColumn.PushInput(cf.TableName);
}
}
if (select.Name != null)
{
newColumn.PushInput(select.Name); // add the scope
}
columns.Add(newColumn);
}
return(columns);
}
else
{
throw new NotImplementedException();
}
if (!String.IsNullOrEmpty(input.Name) && input.Name != From.Name)
{
foreach (ColumnFragment c in columns)
{
c.PushInput(input.Name);
}
}
return(columns);
}
public override SqlFragment Visit(DbApplyExpression expression)
{
DbExpressionBinding inputBinding = expression.Input;
InputFragment input = VisitInputExpression(inputBinding.Expression, inputBinding.VariableName, inputBinding.VariableType);
DbExpressionBinding applyBinding = expression.Apply;
InputFragment apply = VisitInputExpression(applyBinding.Expression, applyBinding.VariableName, applyBinding.VariableType);
SelectStatement select = new SelectStatement(this);
bool isInputSelect = false;
if (!(input is TableFragment))
{
input.Wrap(scope);
isInputSelect = true;
}
apply.Wrap(scope);
select.From = input;
select.Wrap(scope);
if (apply is SelectStatement)
{
SelectStatement applySel = apply as SelectStatement;
foreach (ColumnFragment f in applySel.Columns)
{
SelectStatement newColSelect = new SelectStatement(this);
newColSelect.From = applySel.From;
newColSelect.Where = applySel.Where;
if (isInputSelect)
{
VisitAndReplaceTableName(newColSelect.Where, (input as SelectStatement).From.Name, input.Name, null);
}
newColSelect.Limit = applySel.Limit;
newColSelect.OrderBy = applySel.OrderBy;
newColSelect.Skip = applySel.Skip;
newColSelect.GroupBy = applySel.GroupBy;
newColSelect.IsDistinct = applySel.IsDistinct;
newColSelect.Columns.Add(f);
newColSelect.Wrap(scope);
scope.Add(applySel.From.Name, applySel.From);
ColumnFragment newCol = new ColumnFragment(apply.Name, f.ColumnName);
newCol.Literal = newColSelect;
newCol.PushInput(newCol.ColumnName);
newCol.PushInput(apply.Name);
select.AddColumn(newCol, scope);
if (string.IsNullOrEmpty(newCol.ColumnAlias))
{
newColSelect.Name = newCol.ColumnName;
newCol.ColumnAlias = newCol.ColumnName;
}
scope.Remove(newColSelect);
}
scope.Remove(applySel.From);
scope.Remove(apply);
}
else if (apply is UnionFragment)
{
UnionFragment uf = apply as UnionFragment;
if (uf.Left == null || uf.Right == null)
{
throw new Exception("Union fragment is not properly formed.");
}
var left = uf.Left as SelectStatement;
var right = uf.Right as SelectStatement;
if (left == null || right == null)
{
throw new NotImplementedException();
}
var whereleft = left.Where as BinaryFragment;
var whereright = right.Where as BinaryFragment;
if (whereleft == null || whereright == null)
{
throw new NotImplementedException();
}
LiteralFragment literalFragmentWhere = null;
//checking where left
if (whereleft.Left is ColumnFragment && whereleft.Right is ColumnFragment)
{
// we replace the where part for a dummy one
if (whereright.Left is ColumnFragment && whereright.Right is ColumnFragment)
{
literalFragmentWhere = new LiteralFragment("1 = 1");
}
}
if (literalFragmentWhere == null)
{
throw new NotImplementedException();
}
var leftouterjoin = new JoinFragment();
leftouterjoin.JoinType = Metadata.GetOperator(DbExpressionKind.LeftOuterJoin);
leftouterjoin.Name = apply.Name;
// validating that column fragment on the left matches the name
// for the input fragment
var leftColumnFragment = whereleft.Left as ColumnFragment;
if (leftColumnFragment == null)
{
throw new NotImplementedException();
}
if (!leftColumnFragment.TableName.Equals(input.Name))
{
new NotImplementedException();
}
var conditionJoin = new BinaryFragment();
conditionJoin.Left = whereleft.Left;
//update to the new reference
var newColumnFragment = whereright.Right as ColumnFragment;
if (newColumnFragment != null)
{
newColumnFragment.TableName = uf.Name;
}
conditionJoin.Right = newColumnFragment;
conditionJoin.Operator = whereleft.Operator;
leftouterjoin.Condition = conditionJoin;
(uf.Left as SelectStatement).Where = literalFragmentWhere;
(uf.Right as SelectStatement).Where = literalFragmentWhere;
leftouterjoin.Left = input;
leftouterjoin.Right = uf;
return(leftouterjoin);
}
return(select);
}
