Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLInt64Storage.cs / 1 / SQLInt64Storage.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //[....] //[....] //----------------------------------------------------------------------------- namespace System.Data.Common { using System; using System.Xml; using System.Data.SqlTypes; using System.Diagnostics; using System.Globalization; using System.IO; using System.Xml.Serialization; using System.Collections; internal sealed class SqlInt64Storage : DataStorage { private SqlInt64[] values; public SqlInt64Storage(DataColumn column) : base(column, typeof(SqlInt64), SqlInt64.Null, SqlInt64.Null) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: SqlInt64 sum = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { sum += values[record];} hasData = true; } if (hasData) { return sum; } return NullValue; case AggregateType.Mean: SqlDecimal meanSum = 0; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += values[record].ToSqlDecimal();} meanCount++; hasData = true; } if (hasData) { SqlInt64 mean = 0; checked {mean = (meanSum /(SqlDecimal) meanCount).ToSqlInt64();} return mean; } return NullValue; case AggregateType.Var: case AggregateType.StDev: int count = 0; SqlDouble var = (SqlDouble)0; SqlDouble prec = (SqlDouble)0; SqlDouble dsum = (SqlDouble)0; SqlDouble sqrsum = (SqlDouble)0; foreach (int record in records) { if (IsNull(record)) continue; dsum += (values[record]).ToSqlDouble(); sqrsum += (values[record]).ToSqlDouble() * (values[record]).ToSqlDouble(); count++; } if (count > 1) { var = ((SqlDouble)count * sqrsum - (dsum * dsum)); prec = var / (dsum * dsum); // we are dealing with the risk of a cancellation error // double is guaranteed only for 15 digits so a difference // with a result less than 1e-15 should be considered as zero if ((prec < 1e-15) || (var <0)) var = 0; else var = var / (count * (count -1)); if (kind == AggregateType.StDev) { return Math.Sqrt(var.Value); } return var; } return NullValue; case AggregateType.Min: SqlInt64 min = SqlInt64.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlInt64.LessThan(values[record], min)).IsTrue) min = values[record]; hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SqlInt64 max = SqlInt64.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlInt64.GreaterThan(values[record], max)).IsTrue) max = values[record]; hasData = true; } if (hasData) { return max; } return NullValue; case AggregateType.First: if (records.Length > 0) { return values[records[0]]; } return null;// no data => null case AggregateType.Count: count = 0; for (int i = 0; i < records.Length; i++) { if (!IsNull(records[i])) count++; } return count; } } catch (OverflowException) { throw ExprException.Overflow(typeof(SqlInt64)); } throw ExceptionBuilder.AggregateException(kind, DataType); } override public int Compare(int recordNo1, int recordNo2) { return values[recordNo1].CompareTo(values[recordNo2]); } override public int CompareValueTo(int recordNo, Object value) { return values[recordNo].CompareTo((SqlInt64)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlInt64(value); } return NullValue; } override public void Copy(int recordNo1, int recordNo2) { values[recordNo2] = values[recordNo1]; } override public Object Get(int record) { return values[record]; } override public bool IsNull(int record) { return (values[record].IsNull); } override public void Set(int record, Object value) { values[record] = SqlConvert.ConvertToSqlInt64( value); } override public void SetCapacity(int capacity) { SqlInt64[] newValues = new SqlInt64[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlInt64 newValue = new SqlInt64(); string tempStr =string.Concat("", s, ""); // this is done since you can give fragmet to reader, bug 98767 StringReader strReader = new StringReader(tempStr); IXmlSerializable tmp = newValue; using (XmlTextReader xmlTextReader = new XmlTextReader(strReader)) { tmp.ReadXml(xmlTextReader); } return ((SqlInt64)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlInt64)), "wrong input type"); StringWriter strwriter = new StringWriter(FormatProvider); using (XmlTextWriter xmlTextWriter = new XmlTextWriter (strwriter)) { ((IXmlSerializable)value).WriteXml(xmlTextWriter); } return (strwriter.ToString ()); } override protected object GetEmptyStorage(int recordCount) { return new SqlInt64[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlInt64[] typedStore = (SqlInt64[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlInt64[]) store; //SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- TextRunCache.cs
- ChtmlTextBoxAdapter.cs
- RSAPKCS1KeyExchangeFormatter.cs
- loginstatus.cs
- HttpProxyTransportBindingElement.cs
- Configuration.cs
- MappedMetaModel.cs
- CodeThrowExceptionStatement.cs
- EditorZoneBase.cs
- Geometry3D.cs
- TypeConvertions.cs
- BitmapVisualManager.cs
- ToolStripStatusLabel.cs
- SevenBitStream.cs
- RC2CryptoServiceProvider.cs
- CalendarBlackoutDatesCollection.cs
- KeyFrames.cs
- GorillaCodec.cs
- ComPlusDiagnosticTraceRecords.cs
- InternalDispatchObject.cs
- arabicshape.cs
- EdmScalarPropertyAttribute.cs
- AttachedPropertyDescriptor.cs
- _HTTPDateParse.cs
- SharedDp.cs
- MultiBinding.cs
- KeyInstance.cs
- Message.cs
- _LocalDataStore.cs
- SqlCharStream.cs
- PathGradientBrush.cs
- BaseTemplateParser.cs
- BitmapEffectGroup.cs
- KeyInstance.cs
- IndentedWriter.cs
- WebServiceMethodData.cs
- BooleanProjectedSlot.cs
- ConnectionManagementElement.cs
- ImageFormatConverter.cs
- ShimAsPublicXamlType.cs
- ContainerSelectorActiveEvent.cs
- DockPattern.cs
- WorkflowWebService.cs
- ClientRoleProvider.cs
- DeferredReference.cs
- WinEventQueueItem.cs
- SqlProcedureAttribute.cs
- GridLength.cs
- ErrorFormatterPage.cs
- UdpSocketReceiveManager.cs
- StringExpressionSet.cs
- Int16.cs
- SuppressIldasmAttribute.cs
- IPPacketInformation.cs
- KeyNotFoundException.cs
- StrongNameIdentityPermission.cs
- AuthenticationService.cs
- RelatedView.cs
- Font.cs
- ProcessProtocolHandler.cs
- DetailsViewRow.cs
- LocalizableAttribute.cs
- DEREncoding.cs
- TitleStyle.cs
- DesignerCapabilities.cs
- ValueProviderWrapper.cs
- FontFamily.cs
- SqlDataReaderSmi.cs
- HMACSHA512.cs
- SiteMembershipCondition.cs
- ToolStripGrip.cs
- DataColumnPropertyDescriptor.cs
- unsafenativemethodsother.cs
- COM2ExtendedUITypeEditor.cs
- ISCIIEncoding.cs
- ListDictionaryInternal.cs
- ProjectionRewriter.cs
- IISMapPath.cs
- IPEndPoint.cs
- ToolBarButton.cs
- Size3D.cs
- XslVisitor.cs
- RenderContext.cs
- UnmanagedHandle.cs
- AlternateViewCollection.cs
- FramingFormat.cs
- ObjectToIdCache.cs
- HtmlHead.cs
- RegexStringValidator.cs
- GetRecipientRequest.cs
- CreateRefExpr.cs
- IfAction.cs
- VectorAnimationBase.cs
- OdbcUtils.cs
- StringFreezingAttribute.cs
- StreamedFramingRequestChannel.cs
- RequestNavigateEventArgs.cs
- Cloud.cs
- TableLayoutPanel.cs
- ProtocolElementCollection.cs