protected void VisitNewInstanceExpression(SelectStatement select,
DbNewInstanceExpression expression)
{
Debug.Assert(expression.ResultType.EdmType is RowType);
RowType row = expression.ResultType.EdmType as RowType;
for (int i = 0; i < expression.Arguments.Count; i++)
{
ColumnFragment col;
SqlFragment fragment = expression.Arguments[i].Accept(this);
if (fragment is ColumnFragment)
{
col = fragment as ColumnFragment;
}
else
{
col = new ColumnFragment(null, null);
col.Literal = fragment;
}
col.ColumnAlias = row.Properties[i].Name;
select.Columns.Add(col);
}
}
public override bool Equals(object obj)
{
if (!(obj is ColumnFragment))
{
return(false);
}
ColumnFragment column = obj as ColumnFragment;
if (column.PropertyFragment != null && PropertyFragment != null)
{
return(column.PropertyFragment.Equals(PropertyFragment));
}
if (column.TableName != TableName)
{
return(false);
}
if (column.ColumnName != ColumnName)
{
return(false);
}
if (column.ColumnAlias != ColumnAlias)
{
return(false);
}
return(true);
}
public ColumnFragment Clone()
{
ColumnFragment cf = new ColumnFragment(TableName, ColumnName);
cf.ColumnAlias = ColumnAlias;
cf.Literal = Literal;
return(cf);
}
public override void WriteSql(StringBuilder sql)
{
ColumnFragment columnFragment = Column as ColumnFragment;
Debug.Assert(columnFragment != null);
columnFragment.WriteSql(sql);
sql.AppendFormat(" {0}", Ascending ? "ASC" : "DESC");
}
public bool HasDifferentNameForColumn(ColumnFragment column)
{
Debug.Assert(Left is SelectStatement);
Debug.Assert(Right is SelectStatement);
if ((Left as SelectStatement).HasDifferentNameForColumn(column))
{
return(true);
}
return((Right as SelectStatement).HasDifferentNameForColumn(column));
}
public ColumnFragment GetColumnFromProperties(PropertyFragment properties)
{
ColumnFragment col = Left.GetColumnFromProperties(properties);
if (col == null)
{
col = Right.GetColumnFromProperties(properties);
}
return(col);
}
public bool HasDifferentNameForColumn(ColumnFragment column)
{
if (!hasRenamedColumns) return false;
foreach (ColumnFragment c in Columns)
{
if (!c.Equals(column)) continue;
if (String.IsNullOrEmpty(c.ColumnAlias)) return false;
column.ColumnName = c.ColumnAlias;
return true;
}
return false;
}
private 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);
columns.Add(col);
}
return(columns);
}
public override SqlFragment Visit(DbGroupByExpression expression)
{
// first process the input
DbGroupExpressionBinding e = expression.Input;
SelectStatement innerSelect = VisitInputExpressionEnsureSelect(e.Expression, e.VariableName, e.VariableType);
scope.Add(e.GroupVariableName, innerSelect);
SelectStatement select = WrapIfNotCompatible(innerSelect, expression.ExpressionKind);
CollectionType ct = (CollectionType)expression.ResultType.EdmType;
RowType rt = (RowType)ct.TypeUsage.EdmType;
int propIndex = 0;
foreach (DbExpression key in expression.Keys)
{
var fragment = key.Accept(this);
select.AddGroupBy(fragment);
propIndex++;
var colFragment = fragment as ColumnFragment;
if (colFragment != null)
{
colFragment = colFragment.Clone();
colFragment.ColumnAlias = String.Format("K{0}", propIndex);
select.Columns.Add(colFragment);
}
}
for (int agg = 0; agg < expression.Aggregates.Count; agg++)
{
DbAggregate a = expression.Aggregates[agg];
DbFunctionAggregate fa = a as DbFunctionAggregate;
if (fa == null)
{
throw new NotSupportedException();
}
string alias = rt.Properties[propIndex++].Name;
ColumnFragment functionCol = new ColumnFragment(null, null);
functionCol.Literal = HandleFunction(fa, a.Arguments[0].Accept(this));
functionCol.ColumnAlias = alias;
select.Columns.Add(functionCol);
}
return(select);
}
public override SqlFragment Visit(DbPropertyExpression expression)
{
propertyLevel++;
PropertyFragment fragment = expression.Instance.Accept(this) as PropertyFragment;
fragment.Properties.Add(expression.Property.Name);
propertyLevel--;
// if we are not at the top level property then just return
if (propertyLevel > 0)
{
return(fragment);
}
ColumnFragment column = new ColumnFragment(null, fragment.LastProperty);
column.PropertyFragment = fragment;
InputFragment input = scope.FindInputFromProperties(fragment);
if (input != null)
{
column.TableName = input.Name;
}
// now we need to check if our column name was possibly renamed
if (input is TableFragment)
{
return(column);
}
SelectStatement select = input as SelectStatement;
UnionFragment union = input as UnionFragment;
if (select != null)
{
select.HasDifferentNameForColumn(column);
}
else if (union != null)
{
union.HasDifferentNameForColumn(column);
}
// input is a table, selectstatement, or unionstatement
return(column);
}
public override SqlFragment Visit(DbNewInstanceExpression expression)
{
Debug.Assert(expression.ResultType.EdmType is CollectionType);
SelectStatement s = new SelectStatement();
ColumnFragment c = new ColumnFragment(null, null);
if (expression.Arguments.Count != 0)
{
c.Literal = (LiteralFragment)expression.Arguments[0].Accept(this);
}
else
{
c.Literal = new LiteralFragment("NULL");
}
c.ColumnAlias = "X";
s.Columns.Add(c);
return(s);
}
private 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);
columns = GetDefaultColumnsForFragment(input.Left);
if (input is JoinFragment && input.Right != null)
{
List <ColumnFragment> right = GetDefaultColumnsForFragment(input.Right);
columns.AddRange(right);
}
}
else if (input is SelectStatement)
{
SelectStatement select = input as SelectStatement;
foreach (ColumnFragment cf in select.Columns)
{
ColumnFragment newColumn = new ColumnFragment(cf.TableName, cf.ActualColumnName);
newColumn.PushInput(cf.ActualColumnName);
columns.Add(newColumn);
}
}
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 bool HasDifferentNameForColumn(ColumnFragment column)
{
if (!hasRenamedColumns)
{
return(false);
}
foreach (ColumnFragment c in Columns)
{
if (!c.Equals(column))
{
continue;
}
if (String.IsNullOrEmpty(c.ColumnAlias))
{
return(false);
}
column.ColumnName = c.ColumnAlias;
return(true);
}
return(false);
}
private 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);
columns = GetDefaultColumnsForFragment(input.Left);
if (input is JoinFragment && input.Right != null)
{
List<ColumnFragment> right = GetDefaultColumnsForFragment(input.Right);
columns.AddRange(right);
}
}
else if (input is SelectStatement)
{
SelectStatement select = input as SelectStatement;
foreach (ColumnFragment cf in select.Columns)
{
ColumnFragment newColumn = new ColumnFragment(cf.TableName, cf.ActualColumnName);
newColumn.PushInput(cf.ActualColumnName);
columns.Add(newColumn);
}
}
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 bool HasDifferentNameForColumn(ColumnFragment column)
{
Debug.Assert(Left is SelectStatement);
Debug.Assert(Right is SelectStatement);
if ((Left as SelectStatement).HasDifferentNameForColumn(column))
return true;
return (Right as SelectStatement).HasDifferentNameForColumn(column);
}
public ColumnFragment Clone()
{
ColumnFragment cf = new ColumnFragment(TableName, ColumnName);
cf.ColumnAlias = ColumnAlias;
cf.Literal = Literal;
return cf;
}
public override SqlFragment Visit(DbNewInstanceExpression expression)
{
Debug.Assert(expression.ResultType.EdmType is CollectionType);
SelectStatement s = new SelectStatement();
ColumnFragment c = new ColumnFragment(null, null);
if (expression.Arguments.Count != 0)
c.Literal = (LiteralFragment)expression.Arguments[0].Accept(this);
else
c.Literal = new LiteralFragment("NULL");
c.ColumnAlias = "X";
s.Columns.Add(c);
return s;
}
public override SqlFragment Visit(DbGroupByExpression expression)
{
// first process the input
DbGroupExpressionBinding e = expression.Input;
SelectStatement innerSelect = VisitInputExpressionEnsureSelect(e.Expression, e.VariableName, e.VariableType);
scope.Add(e.GroupVariableName, innerSelect);
SelectStatement select = WrapIfNotCompatible(innerSelect, expression.ExpressionKind);
CollectionType ct = (CollectionType)expression.ResultType.EdmType;
RowType rt = (RowType)ct.TypeUsage.EdmType;
int propIndex = 0;
foreach (DbExpression key in expression.Keys)
{
var fragment = key.Accept(this);
select.AddGroupBy(fragment);
propIndex++;
var colFragment = fragment as ColumnFragment;
if (colFragment != null)
{
colFragment = colFragment.Clone();
colFragment.ColumnAlias = String.Format("K{0}", propIndex);
select.Columns.Add(colFragment);
}
}
for (int agg = 0; agg < expression.Aggregates.Count; agg++)
{
DbAggregate a = expression.Aggregates[agg];
DbFunctionAggregate fa = a as DbFunctionAggregate;
if (fa == null) throw new NotSupportedException();
string alias = rt.Properties[propIndex++].Name;
ColumnFragment functionCol = new ColumnFragment(null, null);
functionCol.Literal = HandleFunction(fa, a.Arguments[0].Accept(this));
functionCol.ColumnAlias = alias;
select.Columns.Add(functionCol);
}
return select;
}
private 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);
columns.Add(col);
}
return columns;
}