Code:
/ DotNET / DotNET / 8.0 / 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
- PictureBoxDesigner.cs
- SqlDataSourceConnectionPanel.cs
- CapabilitiesSection.cs
- PersonalizationStateQuery.cs
- BasicExpressionVisitor.cs
- QueryOutputWriter.cs
- CultureInfoConverter.cs
- FixedMaxHeap.cs
- WebException.cs
- ObjectDataSourceFilteringEventArgs.cs
- UInt16Storage.cs
- ExpandedWrapper.cs
- DataSourceDesigner.cs
- StaticExtensionConverter.cs
- SplitContainer.cs
- ColorDialog.cs
- SecurityTokenAuthenticator.cs
- PropertyEmitter.cs
- ReplyAdapterChannelListener.cs
- ControlPaint.cs
- ServiceRoute.cs
- HasCopySemanticsAttribute.cs
- MailBnfHelper.cs
- BitmapInitialize.cs
- DaylightTime.cs
- SqlCaseSimplifier.cs
- EventEntry.cs
- GridViewCancelEditEventArgs.cs
- RequestCacheManager.cs
- ErrorEventArgs.cs
- FixedHyperLink.cs
- IODescriptionAttribute.cs
- Serializer.cs
- MediaContextNotificationWindow.cs
- DataControlFieldHeaderCell.cs
- WindowsRichEditRange.cs
- MemberBinding.cs
- ImmutableObjectAttribute.cs
- CodeMethodInvokeExpression.cs
- WriteStateInfoBase.cs
- TableLayoutStyle.cs
- QueryResult.cs
- SqlDependencyListener.cs
- CollectionViewGroup.cs
- _DynamicWinsockMethods.cs
- ToolStripProfessionalLowResolutionRenderer.cs
- PrePrepareMethodAttribute.cs
- ImageSource.cs
- HttpBrowserCapabilitiesBase.cs
- CAGDesigner.cs
- TouchPoint.cs
- mediapermission.cs
- RightsManagementEncryptionTransform.cs
- SecuritySessionSecurityTokenAuthenticator.cs
- HelpPage.cs
- ContentValidator.cs
- ElementMarkupObject.cs
- VariableQuery.cs
- VisualStyleRenderer.cs
- RemoteWebConfigurationHostServer.cs
- PreservationFileReader.cs
- BoundsDrawingContextWalker.cs
- FixedNode.cs
- TrustLevel.cs
- Vector3DIndependentAnimationStorage.cs
- BlurBitmapEffect.cs
- HashCodeCombiner.cs
- ObfuscateAssemblyAttribute.cs
- HandledEventArgs.cs
- ContentElement.cs
- DataConnectionHelper.cs
- LinkButton.cs
- TargetInvocationException.cs
- ContextMenuStrip.cs
- SystemParameters.cs
- Utils.cs
- EntityChangedParams.cs
- BamlTreeNode.cs
- ResourceContainer.cs
- TimerElapsedEvenArgs.cs
- RowCache.cs
- Perspective.cs
- BindUriHelper.cs
- XmlNodeChangedEventManager.cs
- WebConfigurationHost.cs
- PenThreadWorker.cs
- OdbcStatementHandle.cs
- TableCellAutomationPeer.cs
- RewritingSimplifier.cs
- SystemMulticastIPAddressInformation.cs
- AppSecurityManager.cs
- DataGridViewRowDividerDoubleClickEventArgs.cs
- SafeArrayRankMismatchException.cs
- OracleConnectionString.cs
- ResourceIDHelper.cs
- PropertyDescriptorGridEntry.cs
- Root.cs
- ExpressionBuilder.cs
- TypedServiceChannelBuilder.cs
- complextypematerializer.cs