Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLByteStorage.cs / 1 / SQLByteStorage.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 SqlByteStorage : DataStorage { private SqlByte[] values; public SqlByteStorage(DataColumn column) : base(column, typeof(SqlByte), SqlByte.Null, SqlByte.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: SqlInt64 meanSum = 0; int meanCount = 0; foreach (int record in records) { if (IsNull(record)) continue; checked { meanSum += values[record].ToSqlInt64();} meanCount++; hasData = true; } if (hasData) { SqlByte mean = 0; checked {mean = (meanSum / (SqlInt64)meanCount).ToSqlByte();} 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: SqlByte min = SqlByte.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlByte.LessThan(values[record], min)).IsTrue) min = values[record]; hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SqlByte max = SqlByte.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlByte.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(SqlByte)); } 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((SqlByte)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlByte(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.ConvertToSqlByte(value); } override public void SetCapacity(int capacity) { SqlByte[] newValues = new SqlByte[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlByte newValue = new SqlByte(); 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 ((SqlByte)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlByte)), "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 SqlByte[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlByte[] typedStore = (SqlByte[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(record, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlByte[]) 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
- entityreference_tresulttype.cs
- JournalEntryStack.cs
- ValidatorCollection.cs
- TextFormatterHost.cs
- UiaCoreApi.cs
- OutputCacheProfile.cs
- FormParameter.cs
- OleDbParameterCollection.cs
- EnumMemberAttribute.cs
- MultiSelector.cs
- DataServiceConfiguration.cs
- MetadataArtifactLoader.cs
- ContainerUIElement3D.cs
- ResourcesGenerator.cs
- ListenerServiceInstallComponent.cs
- LinqExpressionNormalizer.cs
- MessageSmuggler.cs
- X509CertificateClaimSet.cs
- ConfigurationPermission.cs
- SQLInt64.cs
- HttpListenerRequest.cs
- CriticalHandle.cs
- DesignerToolStripControlHost.cs
- AdornerPresentationContext.cs
- LinqToSqlWrapper.cs
- InstanceHandleReference.cs
- GridView.cs
- CompositeActivityDesigner.cs
- DataGridTablesFactory.cs
- PrimitiveDataContract.cs
- FontWeights.cs
- COM2Properties.cs
- UiaCoreTypesApi.cs
- ZipIORawDataFileBlock.cs
- EncoderReplacementFallback.cs
- RetrieveVirtualItemEventArgs.cs
- XmlUnspecifiedAttribute.cs
- ToolStripHighContrastRenderer.cs
- RelationshipConverter.cs
- ValidatedControlConverter.cs
- XmlObjectSerializer.cs
- GeneralTransform2DTo3D.cs
- ComponentEditorPage.cs
- MatrixConverter.cs
- PerformanceCounterPermissionAttribute.cs
- SqlCharStream.cs
- BindingOperations.cs
- MetadataFile.cs
- StorageComplexTypeMapping.cs
- HashCodeCombiner.cs
- EntityDataSourceWrapperCollection.cs
- ComponentDispatcherThread.cs
- EntityProviderFactory.cs
- SoapEnumAttribute.cs
- PropertyOrder.cs
- XmlSchemaFacet.cs
- ImageProxy.cs
- SessionStateUtil.cs
- AnnotationMap.cs
- AssemblyBuilder.cs
- ConfigurationStrings.cs
- DesignerCategoryAttribute.cs
- ForceCopyBuildProvider.cs
- Visual3D.cs
- SimpleRecyclingCache.cs
- SmtpFailedRecipientException.cs
- TypeDescriptionProvider.cs
- XPathEmptyIterator.cs
- SmiRecordBuffer.cs
- LayoutEvent.cs
- BinaryFormatter.cs
- AnchorEditor.cs
- DesignerWebPartChrome.cs
- Lookup.cs
- LambdaCompiler.Statements.cs
- ResourceSetExpression.cs
- XMLSchema.cs
- SQLStringStorage.cs
- SystemSounds.cs
- ObjectStateFormatter.cs
- Attributes.cs
- KeySpline.cs
- DecimalStorage.cs
- AppSettingsExpressionEditor.cs
- MethodBuilderInstantiation.cs
- ListViewSelectEventArgs.cs
- DataObjectCopyingEventArgs.cs
- StandardOleMarshalObject.cs
- MergePropertyDescriptor.cs
- SqlTriggerAttribute.cs
- EntityDataSourceContainerNameItem.cs
- ServiceModelPerformanceCounters.cs
- RTLAwareMessageBox.cs
- CustomCredentialPolicy.cs
- GridEntry.cs
- IDQuery.cs
- ColorBlend.cs
- WindowsBrush.cs
- SQLSingle.cs
- CodeParameterDeclarationExpression.cs