Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLDecimalStorage.cs / 1 / 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. //------------------------------------------------------------------------------ // // 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
- CryptoHelper.cs
- XmlSortKeyAccumulator.cs
- XmlSerializerImportOptions.cs
- Context.cs
- LicFileLicenseProvider.cs
- ThrowHelper.cs
- CopyOnWriteList.cs
- HttpModuleActionCollection.cs
- XmlHierarchicalEnumerable.cs
- PathGeometry.cs
- FontInfo.cs
- DataGridViewRowEventArgs.cs
- TreeViewHitTestInfo.cs
- HostingMessageProperty.cs
- ProfileSettings.cs
- GridView.cs
- DbConnectionPoolIdentity.cs
- Odbc32.cs
- StatusBar.cs
- Component.cs
- SelectionPattern.cs
- StringAnimationUsingKeyFrames.cs
- ProcessThreadCollection.cs
- BooleanFunctions.cs
- smtpconnection.cs
- CommandLineParser.cs
- CloudCollection.cs
- CodeAttributeArgumentCollection.cs
- DataGridViewCellParsingEventArgs.cs
- NumericUpDownAccelerationCollection.cs
- UIElement.cs
- RectAnimation.cs
- HintTextConverter.cs
- AnnouncementInnerClient11.cs
- HtmlFormAdapter.cs
- AspNetCompatibilityRequirementsAttribute.cs
- BrowserDefinition.cs
- XmlMapping.cs
- login.cs
- UICuesEvent.cs
- ToolStripSeparator.cs
- BlurBitmapEffect.cs
- Mutex.cs
- SplitterCancelEvent.cs
- x509utils.cs
- XmlSchemaSubstitutionGroup.cs
- XmlDataDocument.cs
- DuplexClientBase.cs
- AssignDesigner.xaml.cs
- CollectionConverter.cs
- SecurityIdentifierElement.cs
- QfeChecker.cs
- BrowserDefinition.cs
- EventPropertyMap.cs
- XmlnsPrefixAttribute.cs
- StorageMappingItemLoader.cs
- HtmlTableCellCollection.cs
- ToolboxControl.cs
- mediaeventargs.cs
- TableCellAutomationPeer.cs
- ComponentRenameEvent.cs
- XPathScanner.cs
- DataGridViewColumnConverter.cs
- WpfKnownMemberInvoker.cs
- EnumerableRowCollectionExtensions.cs
- DateTimeOffset.cs
- OleDbParameterCollection.cs
- ObjectCloneHelper.cs
- Barrier.cs
- NumberFormatter.cs
- ConstructorBuilder.cs
- XmlSchemaSimpleContent.cs
- UniqueEventHelper.cs
- DataColumnMappingCollection.cs
- ErrorProvider.cs
- IssuanceTokenProviderBase.cs
- _Events.cs
- AssemblyAttributes.cs
- HashStream.cs
- Int16.cs
- SerializationAttributes.cs
- ObjectItemNoOpAssemblyLoader.cs
- XmlIncludeAttribute.cs
- LineInfo.cs
- BufferedReadStream.cs
- FacetValueContainer.cs
- HttpWebResponse.cs
- CompilerScopeManager.cs
- TreeIterators.cs
- ListViewHitTestInfo.cs
- BrowserCapabilitiesCompiler.cs
- OdbcCommandBuilder.cs
- FixedFlowMap.cs
- DoubleUtil.cs
- HtmlImage.cs
- WebControlsSection.cs
- ExpressionBinding.cs
- WindowsScroll.cs
- XmlDataImplementation.cs
- ConstraintManager.cs