public override SqlFragment Visit(DbScanExpression expression)
{
EntitySetBase target = expression.Target;
TableFragment fragment = new TableFragment();
MetadataProperty property;
bool propExists = target.MetadataProperties.TryGetValue("DefiningQuery", true, out property);
if (propExists && property.Value != null)
{
fragment.DefiningQuery = new LiteralFragment(property.Value as string);
}
else
{
fragment.Schema = target.EntityContainer.Name;
fragment.Table = target.Name;
propExists = target.MetadataProperties.TryGetValue("Schema", true, out property);
if (propExists && property.Value != null)
{
fragment.Schema = property.Value as string;
}
propExists = target.MetadataProperties.TryGetValue("Table", true, out property);
if (propExists && property.Value != null)
{
fragment.Table = property.Value as string;
}
}
return(fragment);
}
void AddDefaultColumnsForTable(TableFragment table)
{
if (columnHash == null)
{
columnHash = new Dictionary <string, ColumnFragment>();
}
foreach (EdmProperty property in Metadata.GetProperties(table.Type.EdmType))
{
ColumnFragment col = new ColumnFragment(table.Name, property.Name);
if (table.Columns == null)
{
table.Columns = new List <ColumnFragment>();
}
table.Columns.Add(col);
if (columnHash.ContainsKey(col.ColumnName))
{
col.ColumnAlias = MakeColumnNameUnique(col.ColumnName);
columnHash.Add(col.ColumnAlias, col);
}
else
{
columnHash.Add(col.ColumnName, col);
}
Columns.Add(col);
}
}
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);
}
public override SqlFragment Visit(DbScanExpression expression)
{
EntitySetBase target = expression.Target;
TableFragment fragment = new TableFragment();
MetadataProperty property;
bool propExists = target.MetadataProperties.TryGetValue("DefiningQuery", true, out property);
if (propExists && property.Value != null)
{
MetadataProperty prop2;
if (target.MetadataProperties.TryGetValue("http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator:Type", true, out prop2) && (prop2.Value as string == "Views"))
{
// avoid storing view query as DefiningQuery because that hurts query fusing.
fragment.Schema = target.MetadataProperties.GetValue("http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator:Schema", true).Value as string;
fragment.Table = target.Name;
}
else
{
fragment.DefiningQuery = new LiteralFragment(property.Value as string);
}
}
else
{
fragment.Schema = target.EntityContainer.Name;
fragment.Table = target.Name;
propExists = target.MetadataProperties.TryGetValue("Schema", true, out property);
if (propExists && property.Value != null)
{
fragment.Schema = property.Value as string;
}
propExists = target.MetadataProperties.TryGetValue("Table", true, out property);
if (propExists && property.Value != null)
{
fragment.Table = property.Value as string;
}
}
return(fragment);
}
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;
}
public void Visit(TableFragment f)
{
}
public void Visit(TableFragment f)
{
}
/// <summary>
/// If input sqlFragment is a group by structure, is flattened to remove some nested correlation queries.
/// </summary>
/// <param name="input"></param>
/// <returns></returns>
private SqlFragment TryFlatteningGroupBy(SqlFragment input)
{
SelectStatement select = null;
SelectStatement tmpFrag = null, tmpFrag2 = null, tmpFrag3 = null;
InputFragment table = null;
string objName = null, colName = null, queryName = null;
// First part assert is a kind-of structure we are looking for
tmpFrag = input as SelectStatement;
if (tmpFrag == null)
{
goto NoChanges;
}
tmpFrag = (tmpFrag).From as SelectStatement;
if (tmpFrag == null)
{
goto NoChanges;
}
queryName = tmpFrag.Name;
if (tmpFrag.Columns.Count < 2)
{
goto NoChanges;
}
if (!(tmpFrag.Columns[0] is ColumnFragment))
{
goto NoChanges;
}
colName = objName = (tmpFrag.Columns[0] as ColumnFragment).ActualColumnName;
tmpFrag2 = tmpFrag.From as SelectStatement;
if (tmpFrag2 == null)
{
goto NoChanges;
}
if (tmpFrag2.Columns.Count < 1 || !(tmpFrag2.Columns[0] is ColumnFragment))
{
goto NoChanges;
}
if (string.CompareOrdinal(objName, tmpFrag2.Columns[0].ActualColumnName) != 0)
{
goto NoChanges;
}
if (tmpFrag.Columns[1].Literal == null)
{
goto NoChanges;
}
tmpFrag2 = tmpFrag.Columns[1].Literal as SelectStatement;
if (tmpFrag2 == null)
{
goto NoChanges;
}
if ((tmpFrag2.Columns.Count != 1) || !(tmpFrag2.Columns[0].Literal != null))
{
goto NoChanges;
}
tmpFrag3 = tmpFrag2.From as SelectStatement;
if (tmpFrag3 == null)
{
goto NoChanges;
}
table = tmpFrag3.From as InputFragment;
if (table == null)
{
goto NoChanges;
}
FunctionFragment func = tmpFrag2.Columns[0].Literal as FunctionFragment;
if (tmpFrag3.Columns.Count != 1 || !(tmpFrag3.Columns[0] is ColumnFragment))
{
goto NoChanges;
}
if (func == null)
{
goto NoChanges;
}
// Yes it is the kind-of type we like, then optimize it
select = new SelectStatement(this);
table.Name = null;
string tableName = null;
TableFragment t = tmpFrag3.From as TableFragment;
if (t == null)
{
tableName = tmpFrag3.Columns[0].TableName;
}
else
{
tableName = t.Table;
}
select.From = table;
select.Columns.Add(new ColumnFragment(tableName, colName));
select.Columns.Add(new ColumnFragment(tableName, "C0")
{
ColumnAlias = "C1",
Literal = new FunctionFragment()
{
Argument = new ColumnFragment(tableName, tmpFrag3.Columns[0].ActualColumnName),
Distinct = tmpFrag3.IsDistinct,
Name = func.Name
}
});
select.Wrap(null);
select.Name = queryName;
select.AddGroupBy(select.Columns[0]);
(input as SelectStatement).From = select;
NoChanges:
return(input);
}
void AddDefaultColumnsForTable(TableFragment table)
{
if (columnHash == null)
columnHash = new Dictionary<string, ColumnFragment>();
foreach (EdmProperty property in Metadata.GetProperties(table.Type.EdmType))
{
ColumnFragment col = new ColumnFragment(table.Name, property.Name);
if (table.Columns == null)
table.Columns = new List<ColumnFragment>();
table.Columns.Add(col);
if (columnHash.ContainsKey(col.ColumnName))
{
col.ColumnAlias = MakeColumnNameUnique(col.ColumnName);
columnHash.Add(col.ColumnAlias, col);
}
else
columnHash.Add(col.ColumnName, col);
Columns.Add(col);
}
}
