Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLDecimalStorage.cs / 1305376 / SQLDecimalStorage.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 SqlDecimalStorage : DataStorage { private SqlDecimal[] values; public SqlDecimalStorage(DataColumn column) : base(column, typeof(SqlDecimal), SqlDecimal.Null, SqlDecimal.Null) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: SqlDecimal 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];} meanCount++; hasData = true; } if (hasData) { SqlDecimal mean = 0; checked {mean = (meanSum /(SqlDecimal) meanCount);} 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: SqlDecimal min = SqlDecimal.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlDecimal.LessThan(values[record], min)).IsTrue) min = values[record]; hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SqlDecimal max = SqlDecimal.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlDecimal.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; 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(SqlDecimal)); } 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((SqlDecimal)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlDecimal(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.ConvertToSqlDecimal( value); } override public void SetCapacity(int capacity) { SqlDecimal[] newValues = new SqlDecimal[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlDecimal newValue = new SqlDecimal(); 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 ((SqlDecimal)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlDecimal)), "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 SqlDecimal[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlDecimal[] typedStore = (SqlDecimal[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlDecimal[]) store; //SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ComAdminInterfaces.cs
- CodeCompileUnit.cs
- TraceContextEventArgs.cs
- Timer.cs
- MouseGestureValueSerializer.cs
- SubtreeProcessor.cs
- InputLanguageManager.cs
- ApplicationManager.cs
- ExceptionRoutedEventArgs.cs
- odbcmetadatafactory.cs
- Viewport3DAutomationPeer.cs
- LocalBuilder.cs
- BindingCompleteEventArgs.cs
- MasterPage.cs
- TypeSystemProvider.cs
- FixedSchema.cs
- CompilerError.cs
- RelatedEnd.cs
- FixedDocumentPaginator.cs
- PrinterSettings.cs
- DataObjectCopyingEventArgs.cs
- PropertyMetadata.cs
- TypeDescriptor.cs
- HandlerFactoryCache.cs
- XPathParser.cs
- CodeAttributeDeclaration.cs
- TreeViewEvent.cs
- X509CertificateRecipientServiceCredential.cs
- UnsafeNativeMethodsMilCoreApi.cs
- DocumentPaginator.cs
- ScaleTransform.cs
- ScrollItemPattern.cs
- XmlCharType.cs
- TypeConvertions.cs
- MarginCollapsingState.cs
- VariantWrapper.cs
- Rect3DConverter.cs
- CookieProtection.cs
- GenericIdentity.cs
- _AutoWebProxyScriptWrapper.cs
- exports.cs
- XmlCollation.cs
- SqlDataSource.cs
- Trace.cs
- ProviderConnectionPointCollection.cs
- ValidationErrorCollection.cs
- FacetValueContainer.cs
- CompressionTransform.cs
- XmlTextReaderImplHelpers.cs
- XsltInput.cs
- HttpChannelBindingToken.cs
- ConfigurationManager.cs
- EmulateRecognizeCompletedEventArgs.cs
- ConfigurationValues.cs
- FixUp.cs
- PropertyFilterAttribute.cs
- SendingRequestEventArgs.cs
- DataServiceKeyAttribute.cs
- CachingHintValidation.cs
- SpecialNameAttribute.cs
- AttributedMetaModel.cs
- QueryStringHandler.cs
- DataGridViewCellCollection.cs
- OciEnlistContext.cs
- _LazyAsyncResult.cs
- Size3D.cs
- TagPrefixAttribute.cs
- ComboBoxAutomationPeer.cs
- CodeDomComponentSerializationService.cs
- DbConnectionStringBuilder.cs
- FontWeights.cs
- DataSourceControl.cs
- _BufferOffsetSize.cs
- MissingMethodException.cs
- ForEachAction.cs
- TemplateControlBuildProvider.cs
- InputProviderSite.cs
- TimerElapsedEvenArgs.cs
- HMACSHA256.cs
- TypedElement.cs
- TextBox.cs
- RequestCacheEntry.cs
- StringValueConverter.cs
- BamlRecordReader.cs
- Shape.cs
- LookupBindingPropertiesAttribute.cs
- ToolStripContentPanel.cs
- ContentPosition.cs
- ListViewItem.cs
- VirtualDirectoryMappingCollection.cs
- MediaScriptCommandRoutedEventArgs.cs
- AcceleratedTokenProviderState.cs
- ParallelTimeline.cs
- NodeInfo.cs
- DictionaryCustomTypeDescriptor.cs
- CompilerGeneratedAttribute.cs
- BatchServiceHost.cs
- RadialGradientBrush.cs
- XmlCharCheckingWriter.cs
- SqlVersion.cs