/// <summary>
/// Begins a new SELECT statement with the clause as the first value returned.
/// </summary>
/// <param name="clause">Any valid SQL clause (DBConst, DBParam, etc.) </param>
/// <returns>A new DBSelectQuery to support statement chaining</returns>
public static DBSelectQuery Select(DBClause clause)
{
DBSelectQuery q = new DBSelectQuery();
q.SelectSet = DBSelectSet.Select(clause);
q.Last = q.SelectSet;
return(q);
}
public static DBSelectSet SelectAggregate(AggregateFunction funct, DBClause field)
{
DBAggregate agg = DBAggregate.Aggregate(funct, field);
DBSelectSet sel = DBSelectSet.Select(agg);
sel.Last = agg;
return(sel);
}
/// <summary>
/// Begins a new SELECT statement with the clauses as the first values returned
/// </summary>
/// <param name="clauses">Any valid clause (DBConst, DBParam, etc)</param>
/// <returns>A new DBSelectQuery to support statement chaining</returns>
public static DBSelectQuery Select(params DBClause[] clauses)
{
DBSelectQuery q = new DBSelectQuery();
q.SelectSet = DBSelectSet.Select();
foreach (DBClause c in clauses)
{
q.SelectSet.And(c);
}
q.Last = q.SelectSet;
return(q);
}
/// <summary>
/// Specify one of the columns to be set when performing this insert
/// </summary>
/// <param name="field">Any clause</param>
/// <returns>Itself so that statements can be chained</returns>
public DBInsertQuery Field(DBClause field)
{
if (_fields == null)
{
_last = _fields = DBSelectSet.Select(field);
}
else
{
_last = _fields.And(field);
}
return(this);
}
protected virtual DBClause DoRead(string element, XmlReader reader, XmlReaderContext context)
{
DBClause c = null;
switch (element)
{
case (XmlHelper.Select):
c = DBSelectQuery.Select();
break;
case (XmlHelper.Delete):
c = DBDeleteQuery.Delete();
break;
case (XmlHelper.Update):
c = DBUpdateQuery.Update();
break;
case (XmlHelper.Insert):
c = DBInsertQuery.InsertInto();
break;
case (XmlHelper.Script):
c = DBQuery.Script();
break;
case (XmlHelper.Use):
c = DBUseQuery.Use();
break;
case (XmlHelper.Table):
c = DBTable.Table();
break;
case (XmlHelper.Fields):
c = DBSelectSet.Select();
break;
case (XmlHelper.AField):
c = DBField.Field();
break;
case (XmlHelper.AllFields):
c = DBField.AllFields();
break;
case (XmlHelper.From):
c = DBTableSet.From();
break;
case (XmlHelper.Where):
c = DBFilterSet.Where();
break;
case (XmlHelper.Group):
c = DBGroupBySet.GroupBy();
break;
case (XmlHelper.Order):
c = DBOrderSet.OrderBy();
break;
case (XmlHelper.Assignments):
c = DBAssignSet.Assign();
break;
case (XmlHelper.Values):
c = DBValueSet.Values();
break;
case (XmlHelper.Join):
c = DBJoin.Join();
break;
case (XmlHelper.Function):
c = DBFunction.Function();
break;
case (XmlHelper.Constant):
c = DBConst.Null();
break;
case (XmlHelper.Top):
c = DBTop.Top();
break;
case (XmlHelper.UnaryOp):
c = DBComparison.Not();
break;
case (XmlHelper.Compare):
c = DBComparison.Compare();
break;
case (XmlHelper.Between):
c = DBComparison.Between();
break;
case (XmlHelper.Parameter):
//parameter is a special case.
//we add them to akeyed colection if they are not already registered
//then at the end we set the values at the end
string name = reader.GetAttribute(XmlHelper.Name);
DBParam aparam;
if (context.Parameters.TryGetParameter(name, out aparam))
{
c = aparam;
}
else
{
aparam = DBParam.Param();
aparam.Name = name;
context.Parameters.Add(aparam);
c = aparam;
}
break;
case (XmlHelper.OrderBy):
c = DBOrder.OrderBy();
break;
case (XmlHelper.Calculation):
c = DBCalc.Calculate();
break;
case (XmlHelper.Aggregate):
c = DBAggregate.Aggregate();
break;
case (XmlHelper.ValueGroup):
c = DBValueGroup.Empty();
break;
case (XmlHelper.BooleanOperator):
c = DBBooleanOp.Compare();
break;
case (XmlHelper.Assign):
c = DBAssign.Assign();
break;
case (XmlHelper.InnerSelect):
c = DBSubQuery.SubSelect();
break;
case (XmlHelper.Multiple):
c = DBMultiComparisonRef.Many();
break;
case (XmlHelper.QueryOptionSet):
c = new DBQueryHintOptionSet();
break;
case (XmlHelper.QueryOption):
c = DBQueryHintOption.QueryOption();
break;
case (XmlHelper.CreateSproc):
c = DBCreateProcedureQuery.CreateProcedure();
break;
case (XmlHelper.Declare):
c = DBDeclaration.Declare();
break;
case (XmlHelper.CreateTable):
c = DBCreateTableQuery.Table();
break;
case (XmlHelper.ColumnDefinition):
c = DBColumn.Column();
break;
case (XmlHelper.PrimaryKey):
c = DBPrimaryKey.PrimaryKey();
break;
case (XmlHelper.ForeignKey):
c = DBForeignKey.ForeignKey();
break;
case (XmlHelper.CreateIndex):
c = DBCreateIndexQuery.Index();
break;
case (XmlHelper.CreateView):
c = DBCreateViewQuery.CreateView();
break;
case (XmlHelper.CreateSequence):
c = DBCreateSequenceQuery.Sequence();
break;
case (XmlHelper.DropTable):
c = DBDropTableQuery.DropTable();
break;
case (XmlHelper.DropIndex):
c = DBDropIndexQuery.DropIndex();
break;
case (XmlHelper.DropView):
c = DBDropViewQuery.DropView();
break;
case (XmlHelper.DropSproc):
c = DBDropProcedureQuery.DropProcedure();
break;
case (XmlHelper.DropSequence):
c = DBDropSequenceQuery.DropSequence();
break;
default:
throw XmlHelper.CreateException("The XML data could not be deserialized because the element {1} was not recognised. {0}", reader, null, element);
}
if (c != null)
{
c.ReadXml(reader, context);
}
return(c);
}