Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLDoubleStorage.cs / 1 / SQLDoubleStorage.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 SqlDoubleStorage : DataStorage { private SqlDouble[] values; public SqlDoubleStorage(DataColumn column) : base(column, typeof(SqlDouble), SqlDouble.Null, SqlDouble.Null) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: SqlDouble sum = 0.0d; foreach (int record in records) { if (IsNull(record)) continue; checked { sum += values[record];} hasData = true; } if (hasData) { return sum; } return NullValue; case AggregateType.Mean: SqlDouble meanSum = 0.0d; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += values[record];} meanCount++; hasData = true; } if (hasData) { SqlDouble mean = 0.0d; checked {mean = (meanSum / (SqlDouble) meanCount);} return mean; } return NullValue; case AggregateType.Var: case AggregateType.StDev: int count = 0; SqlDouble var = (SqlDouble)0.0d; SqlDouble prec = (SqlDouble)0.0d; SqlDouble dsum = (SqlDouble)0.0d; SqlDouble sqrsum = (SqlDouble)0.0d; foreach (int record in records) { if (IsNull(record)) continue; dsum += values[record]; sqrsum += values[record]*values[record]; 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: SqlDouble min = SqlDouble.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlDouble.LessThan(values[record], min)).IsTrue) min = values[record]; hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SqlDouble max = SqlDouble.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlDouble.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(SqlDouble)); } 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((SqlDouble)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlDouble(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.ConvertToSqlDouble( value); } override public void SetCapacity(int capacity) { SqlDouble[] newValues = new SqlDouble[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlDouble newValue = new SqlDouble(); 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 ((SqlDouble)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlDouble)), "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 SqlDouble[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlDouble[] typedStore = (SqlDouble[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlDouble[]) store; //SetNullStorage(nullbits); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ // // 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 SqlDoubleStorage : DataStorage { private SqlDouble[] values; public SqlDoubleStorage(DataColumn column) : base(column, typeof(SqlDouble), SqlDouble.Null, SqlDouble.Null) { } override public Object Aggregate(int[] records, AggregateType kind) { bool hasData = false; try { switch (kind) { case AggregateType.Sum: SqlDouble sum = 0.0d; foreach (int record in records) { if (IsNull(record)) continue; checked { sum += values[record];} hasData = true; } if (hasData) { return sum; } return NullValue; case AggregateType.Mean: SqlDouble meanSum = 0.0d; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += values[record];} meanCount++; hasData = true; } if (hasData) { SqlDouble mean = 0.0d; checked {mean = (meanSum / (SqlDouble) meanCount);} return mean; } return NullValue; case AggregateType.Var: case AggregateType.StDev: int count = 0; SqlDouble var = (SqlDouble)0.0d; SqlDouble prec = (SqlDouble)0.0d; SqlDouble dsum = (SqlDouble)0.0d; SqlDouble sqrsum = (SqlDouble)0.0d; foreach (int record in records) { if (IsNull(record)) continue; dsum += values[record]; sqrsum += values[record]*values[record]; 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: SqlDouble min = SqlDouble.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlDouble.LessThan(values[record], min)).IsTrue) min = values[record]; hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SqlDouble max = SqlDouble.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlDouble.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(SqlDouble)); } 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((SqlDouble)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlDouble(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.ConvertToSqlDouble( value); } override public void SetCapacity(int capacity) { SqlDouble[] newValues = new SqlDouble[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlDouble newValue = new SqlDouble(); 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 ((SqlDouble)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlDouble)), "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 SqlDouble[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlDouble[] typedStore = (SqlDouble[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlDouble[]) 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
- Brush.cs
- precedingsibling.cs
- DiscoveryDocumentSearchPattern.cs
- ImpersonationContext.cs
- WebFaultClientMessageInspector.cs
- HandlerFactoryCache.cs
- DbUpdateCommandTree.cs
- ReflectionTypeLoadException.cs
- ProfileSection.cs
- PenThreadPool.cs
- DataException.cs
- MasterPage.cs
- Container.cs
- HtmlElementCollection.cs
- DoubleStorage.cs
- CodeCommentStatement.cs
- ThreadStaticAttribute.cs
- LoginViewDesigner.cs
- XamlSerializationHelper.cs
- PageRequestManager.cs
- DataGridViewCellToolTipTextNeededEventArgs.cs
- ConfigXmlCDataSection.cs
- SpeechDetectedEventArgs.cs
- Bold.cs
- TextBox.cs
- DataBindingCollection.cs
- TextElementAutomationPeer.cs
- OracleConnectionStringBuilder.cs
- SmtpNetworkElement.cs
- DataGridViewRowEventArgs.cs
- RegexWorker.cs
- CommonObjectSecurity.cs
- LinqDataSourceDeleteEventArgs.cs
- SecurityContextSecurityTokenAuthenticator.cs
- VideoDrawing.cs
- SafeNativeMethods.cs
- listitem.cs
- IDQuery.cs
- Point3DKeyFrameCollection.cs
- XmlObjectSerializerContext.cs
- HttpResponseHeader.cs
- baseaxisquery.cs
- TextParagraphView.cs
- BindingMemberInfo.cs
- _AutoWebProxyScriptEngine.cs
- ButtonChrome.cs
- CompositeCollection.cs
- BoundPropertyEntry.cs
- MimeFormImporter.cs
- HttpProfileGroupBase.cs
- InvalidateEvent.cs
- ExceptionWrapper.cs
- SiteMapDataSource.cs
- TypeSemantics.cs
- ISO2022Encoding.cs
- CollectionBase.cs
- TimeSpanParse.cs
- MarkupWriter.cs
- PathFigureCollectionConverter.cs
- ByteStreamMessage.cs
- ContainsRowNumberChecker.cs
- ToolStripRenderEventArgs.cs
- UnsafeNativeMethodsPenimc.cs
- WebAdminConfigurationHelper.cs
- DateTimeConverter.cs
- CommandEventArgs.cs
- MultiByteCodec.cs
- PrefixHandle.cs
- PublisherMembershipCondition.cs
- UpdateManifestForBrowserApplication.cs
- DataGridViewBindingCompleteEventArgs.cs
- ReadOnlyTernaryTree.cs
- SoapCommonClasses.cs
- UnsafeNativeMethods.cs
- ProfilePropertySettings.cs
- TemplatePagerField.cs
- DataGridViewSelectedColumnCollection.cs
- XslUrlEditor.cs
- RequestQueue.cs
- InitializationEventAttribute.cs
- TagPrefixAttribute.cs
- HandlerWithFactory.cs
- UnmanagedBitmapWrapper.cs
- Timer.cs
- EventWaitHandle.cs
- InnerItemCollectionView.cs
- CornerRadius.cs
- ContentType.cs
- JoinCqlBlock.cs
- DataServiceRequestOfT.cs
- Activator.cs
- elementinformation.cs
- PointCollection.cs
- BoundConstants.cs
- ToolTipAutomationPeer.cs
- ArraySortHelper.cs
- DataServiceQueryOfT.cs
- CellNormalizer.cs
- Int32Rect.cs
- Comparer.cs