private void GetColumns(MappingEntity entity, Dictionary <string, TableAlias> aliases, List <DbColumnDeclaration> columns)
{
foreach (var mi in this.mapping.GetMappedMembers(entity))
{
if (this.mapping.IsAssociationRelationship(entity, mi) == false)
{
if (this.mapping.IsNestedEntity(entity, mi))
{
this.GetColumns(this.mapping.GetRelatedEntity(entity, mi), aliases, columns);
}
else if (this.mapping.IsColumn(entity, mi))
{
var name = this.mapping.GetColumnName(entity, mi);
var aliasName = this.mapping.GetAlias(entity, mi);
aliases.TryGetValue(aliasName, out TableAlias alias);
var colType = this.GetColumnType(entity, mi);
var ce = new DbColumnExpression(TypeHelper.GetMemberType(mi), colType, alias, name);
var cd = new DbColumnDeclaration(name, ce, colType);
columns.Add(cd);
}
}
}
}
public static DbSelectExpression AddColumn(this DbSelectExpression select, DbColumnDeclaration column)
{
var columns = new List <DbColumnDeclaration>(select.Columns)
{
column
};
return(select.SetColumns(columns));
}
protected override Expression VisitSelect(DbSelectExpression select)
{
select = base.VisitSelect(select) as DbSelectExpression;
if (lookup.Contains(select.Alias))
{
var aggColumns = new List <DbColumnDeclaration>(select.Columns);
foreach (var ae in lookup[select.Alias])
{
var name = "agg" + aggColumns.Count;
var colType = this.language.TypeSystem.GetColumnType(ae.Type);
var cd = new DbColumnDeclaration(name, ae.AggregateInGroupSelect, colType);
this.map.Add(ae, new DbColumnExpression(ae.Type, colType, ae.GroupByAlias, name));
aggColumns.Add(cd);
}
return(new DbSelectExpression(select.Alias, aggColumns, select.From, select.Where, select.OrderBy, select.GroupBy, select.IsDistinct, select.Skip, select.Take, select.IsReverse));
}
return(select);
}
private Expression MakeSubquery(Expression expression)
{
var newAlias = new TableAlias();
var aliases = DbDeclaredAliasGatherer.Gather(expression);
var decls = new List <DbColumnDeclaration>();
foreach (var ta in aliases)
{
foreach (var col in this.columns[ta])
{
var name = decls.GetAvailableColumnName(col.Name);
var decl = new DbColumnDeclaration(name, col, col.QueryType);
decls.Add(decl);
var newCol = new DbColumnExpression(col.Type, col.QueryType, newAlias, col.Name);
this.map.Add(col, newCol);
}
}
return(new DbSelectExpression(newAlias, decls, expression, null));
}
protected virtual bool CompareColumnDeclaration(DbColumnDeclaration a, DbColumnDeclaration b)
{
return(a.Name == b.Name && this.Compare(a.Expression, b.Expression));
}
public static DbSelectExpression RemoveColumn(this DbSelectExpression select, DbColumnDeclaration column)
{
var columns = new List <DbColumnDeclaration>(select.Columns);
if (columns != null)
{
columns.Remove(column);
}
return(select.SetColumns(columns));
}
protected override Expression VisitSelect(DbSelectExpression select)
{
var columns = select.Columns;
var wasRetained = this.retainAllColumns;
this.retainAllColumns = false;
var alternate = null as List <DbColumnDeclaration>;
for (int i = 0, n = select.Columns.Count; i < n; i++)
{
var decl = select.Columns[i];
if (wasRetained || select.IsDistinct || IsColumnUsed(select.Alias, decl.Name))
{
var expr = this.Visit(decl.Expression);
if (expr != decl.Expression)
{
decl = new DbColumnDeclaration(decl.Name, expr, decl.QueryType);
}
}
else
{
decl = null;
}
if (decl != select.Columns[i] && alternate == null)
{
alternate = new List <DbColumnDeclaration>();
for (var j = 0; j < i; j++)
{
alternate.Add(select.Columns[j]);
}
}
if (decl != null && alternate != null)
{
alternate.Add(decl);
}
}
if (alternate != null)
{
columns = alternate.AsReadOnly();
}
var take = this.Visit(select.Take);
var skip = this.Visit(select.Skip);
var groupbys = this.VisitExpressionList(select.GroupBy);
var orderbys = this.VisitOrderBy(select.OrderBy);
var where = this.Visit(select.Where);
var from = this.Visit(select.From);
ClearColumnsUsed(select.Alias);
if (columns != select.Columns || take != select.Take || skip != select.Skip || orderbys != select.OrderBy || groupbys != select.GroupBy || where != select.Where || from != select.From)
{
select = new DbSelectExpression(select.Alias, columns, from, where, orderbys, groupbys, select.IsDistinct, skip, take, select.IsReverse);
}
this.retainAllColumns = wasRetained;
return(select);
}
