public DbVariableDeclaration(
string name, DbDataType type, Expression expression)
{
_name = name;
_type = type;
_expression = expression;
}
public DbNamedValueExpression(string name,
DbDataType dbType, Expression value)
: base(DbExpressionType.NamedValue, value.Type)
{
_name = name;
_dbType = dbType;
_value = value;
}
protected override Expression VisitSelect(DbSelectExpression select)
{
select = (DbSelectExpression)base.VisitSelect(select);
// look for redundant column declarations
List <DbColumnDeclaration> cols = select.Columns.OrderBy(c => c.Name).ToList();
BitArray removed = new BitArray(select.Columns.Count);
bool anyRemoved = false;
for (int i = 0, n = cols.Count; i < n - 1; i++)
{
DbColumnDeclaration ci = cols[i];
DbColumnExpression cix = ci.Expression as DbColumnExpression;
DbDataType qt = cix != null ? cix.DbType : null;
DbColumnExpression cxi = new DbColumnExpression(ci.Expression.Type, qt, select.Alias, ci.Name);
for (int j = i + 1; j < n; j++)
{
if (!removed.Get(j))
{
DbColumnDeclaration cj = cols[j];
if (SameExpression(ci.Expression, cj.Expression))
{
// any reference to 'j' should now just be a reference to 'i'
DbColumnExpression cxj = new DbColumnExpression(cj.Expression.Type, qt, select.Alias, cj.Name);
this.map.Add(cxj, cxi);
removed.Set(j, true);
anyRemoved = true;
}
}
}
}
if (anyRemoved)
{
List <DbColumnDeclaration> newDecls = new List <DbColumnDeclaration>();
for (int i = 0, n = cols.Count; i < n; i++)
{
if (!removed.Get(i))
{
newDecls.Add(cols[i]);
}
}
select = select.SetColumns(newDecls);
}
return(select);
}
public DbVariableExpression(string name, Type type, DbDataType dbType)
: base((ExpressionType)DbExpressionType.Variable, type)
{
_name = name;
_dbType = dbType;
}
public QueryParameter(string name, Type type, DbDataType dbType)
{
this.name = name;
this.type = type;
this._dbType = dbType;
}
public abstract string GetVariableDeclaration(DbDataType type, bool suppressSize);
public DbVariableExpression(string name, Type type, DbDataType dbType)
: base((ExpressionType)DbExpressionType.Variable, type)
{
_name = name;
_dbType = dbType;
}
public abstract string GetVariableDeclaration(DbDataType type, bool suppressSize);
