Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / 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.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ProcessModelSection.cs
- ReadOnlyKeyedCollection.cs
- ColumnWidthChangedEvent.cs
- QilSortKey.cs
- EventLogEntry.cs
- RepeaterItemEventArgs.cs
- AssemblyNameProxy.cs
- RuntimeArgumentHandle.cs
- SecurityContext.cs
- SmtpDigestAuthenticationModule.cs
- DataGridViewTextBoxCell.cs
- TrustManagerMoreInformation.cs
- WebHttpSecurityElement.cs
- TextPattern.cs
- UInt16Storage.cs
- ParameterInfo.cs
- LicenseException.cs
- QuaternionConverter.cs
- Mapping.cs
- SafeCryptHandles.cs
- InputLanguage.cs
- Number.cs
- FSWPathEditor.cs
- RawMouseInputReport.cs
- TextHidden.cs
- MaskedTextBoxDesignerActionList.cs
- isolationinterop.cs
- ApplicationInfo.cs
- TemplateBamlRecordReader.cs
- VolatileEnlistmentMultiplexing.cs
- EnumConverter.cs
- CompositeDuplexBindingElement.cs
- StateItem.cs
- MemberRelationshipService.cs
- InheritanceRules.cs
- EventWaitHandleSecurity.cs
- TypeForwardedFromAttribute.cs
- CompilerCollection.cs
- ExceptionUtil.cs
- SchemaImporter.cs
- ExportOptions.cs
- FileCodeGroup.cs
- NativeMethods.cs
- TreeBuilder.cs
- HostProtectionException.cs
- BufferModeSettings.cs
- ThreadNeutralSemaphore.cs
- SessionEndingCancelEventArgs.cs
- XmlSchemaAttributeGroupRef.cs
- UnsettableComboBox.cs
- TextReader.cs
- OrderPreservingPipeliningMergeHelper.cs
- BasicHttpBindingCollectionElement.cs
- TypeUsage.cs
- MimeReturn.cs
- TextRangeSerialization.cs
- SectionInformation.cs
- SqlTypesSchemaImporter.cs
- CultureSpecificStringDictionary.cs
- ToolStripStatusLabel.cs
- NativeMethods.cs
- CodeGenerator.cs
- MetaModel.cs
- DataGridViewDataErrorEventArgs.cs
- TextCollapsingProperties.cs
- DataGridViewColumnTypePicker.cs
- HtmlLink.cs
- RedistVersionInfo.cs
- SchemaInfo.cs
- CollectionChangedEventManager.cs
- XmlIgnoreAttribute.cs
- DateRangeEvent.cs
- BitmapSource.cs
- DecimalAnimationBase.cs
- WebEventTraceProvider.cs
- WindowHideOrCloseTracker.cs
- TextTreePropertyUndoUnit.cs
- EpmCustomContentDeSerializer.cs
- Mouse.cs
- ApplicationProxyInternal.cs
- SwitchAttribute.cs
- PriorityBindingExpression.cs
- FixedHighlight.cs
- Metadata.cs
- FlowLayout.cs
- AdPostCacheSubstitution.cs
- GridView.cs
- VariableAction.cs
- XPathConvert.cs
- LoadWorkflowByKeyAsyncResult.cs
- SearchForVirtualItemEventArgs.cs
- NavigationPropertySingletonExpression.cs
- FlowDocumentScrollViewer.cs
- MetadataImporterQuotas.cs
- MetadataCollection.cs
- MetadataItem.cs
- TreeWalkHelper.cs
- OrderedDictionaryStateHelper.cs
- RegisteredExpandoAttribute.cs
- FileFormatException.cs