Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / Common / SQLTypes / SQLMoneyStorage.cs / 1 / SQLMoneyStorage.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 SqlMoneyStorage : DataStorage { private SqlMoney[] values; public SqlMoneyStorage(DataColumn column) : base(column, typeof(SqlMoney), SqlMoney.Null, SqlMoney.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]).ToSqlDecimal();} meanCount++; hasData = true; } if (hasData) { SqlMoney mean = 0; checked {mean = (meanSum / (SqlDecimal)meanCount).ToSqlMoney();} 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: SqlMoney min = SqlMoney.MaxValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlMoney.LessThan(values[record], min)).IsTrue) min = values[record]; hasData = true; } if (hasData) { return min; } return NullValue; case AggregateType.Max: SqlMoney max = SqlMoney.MinValue; for (int i = 0; i < records.Length; i++) { int record = records[i]; if (IsNull(record)) continue; if ((SqlMoney.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(SqlMoney)); } 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((SqlMoney)value); } override public object ConvertValue(object value) { if (null != value) { return SqlConvert.ConvertToSqlMoney(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.ConvertToSqlMoney( value); } override public void SetCapacity(int capacity) { SqlMoney[] newValues = new SqlMoney[capacity]; if (null != values) { Array.Copy(values, 0, newValues, 0, Math.Min(capacity, values.Length)); } values = newValues; } override public object ConvertXmlToObject(string s) { SqlMoney newValue = new SqlMoney(); 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 ((SqlMoney)tmp); } override public string ConvertObjectToXml(object value) { Debug.Assert(!DataStorage.IsObjectNull(value), "we shouldn't have null here"); Debug.Assert((value.GetType() == typeof(SqlMoney)), "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 SqlMoney[recordCount]; } override protected void CopyValue(int record, object store, BitArray nullbits, int storeIndex) { SqlMoney[] typedStore = (SqlMoney[]) store; typedStore[storeIndex] = values[record]; nullbits.Set(storeIndex, IsNull(record)); } override protected void SetStorage(object store, BitArray nullbits) { values = (SqlMoney[]) 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
- GenericsInstances.cs
- AggregationMinMaxHelpers.cs
- ProviderCollection.cs
- XmlTextReaderImplHelpers.cs
- basemetadatamappingvisitor.cs
- DataGridRow.cs
- CursorInteropHelper.cs
- LogSwitch.cs
- ResourceDefaultValueAttribute.cs
- DataControlField.cs
- AnnotationComponentManager.cs
- TemplateBindingExtension.cs
- PrivilegeNotHeldException.cs
- SchemaNotation.cs
- DbResourceAllocator.cs
- DataGridSortCommandEventArgs.cs
- SkewTransform.cs
- fixedPageContentExtractor.cs
- NamespaceList.cs
- QuaternionIndependentAnimationStorage.cs
- XmlEventCache.cs
- DbReferenceCollection.cs
- DeviceContext.cs
- StandardOleMarshalObject.cs
- RepeatInfo.cs
- IntSecurity.cs
- NativeMethods.cs
- CryptoConfig.cs
- Action.cs
- SystemWebSectionGroup.cs
- TextHidden.cs
- XmlSchemaComplexContentRestriction.cs
- TraceLevelStore.cs
- SortFieldComparer.cs
- SmiXetterAccessMap.cs
- GregorianCalendar.cs
- SqlRecordBuffer.cs
- XamlTypeMapper.cs
- RepeaterItemEventArgs.cs
- StateMachineExecutionState.cs
- RuleSetDialog.Designer.cs
- CompositeFontInfo.cs
- SessionParameter.cs
- ELinqQueryState.cs
- AccessedThroughPropertyAttribute.cs
- SessionEndingCancelEventArgs.cs
- ListBox.cs
- ConnectionOrientedTransportManager.cs
- CatalogPartCollection.cs
- ConfigurationProperty.cs
- ReferenceService.cs
- DataGridViewDataConnection.cs
- FileSystemInfo.cs
- CodeTypeReferenceExpression.cs
- DataGridAutomationPeer.cs
- PropertyChangingEventArgs.cs
- Panel.cs
- Pkcs7Recipient.cs
- DropDownButton.cs
- RightsManagementPermission.cs
- ColorBlend.cs
- TrackingProvider.cs
- SortedSet.cs
- SecurityDescriptor.cs
- _NegotiateClient.cs
- PreservationFileWriter.cs
- WebPartMinimizeVerb.cs
- Rotation3D.cs
- TextBounds.cs
- Soap12ProtocolImporter.cs
- EventListenerClientSide.cs
- XmlSchemaAnnotation.cs
- PopupRoot.cs
- NestedContainer.cs
- DrawListViewSubItemEventArgs.cs
- DurableOperationContext.cs
- Clause.cs
- DataGridViewCellCancelEventArgs.cs
- ComPlusTraceRecord.cs
- ZipIOEndOfCentralDirectoryBlock.cs
- DefaultValueMapping.cs
- OracleCommandSet.cs
- SynchronizationContext.cs
- DiagnosticsConfiguration.cs
- QuaternionRotation3D.cs
- AdornedElementPlaceholder.cs
- PackWebRequest.cs
- SimpleBitVector32.cs
- PageRanges.cs
- FacetValueContainer.cs
- SQLByte.cs
- DeclarationUpdate.cs
- Enumerable.cs
- EpmTargetTree.cs
- BackStopAuthenticationModule.cs
- SessionParameter.cs
- LinkButton.cs
- MemoryStream.cs
- RowUpdatingEventArgs.cs
- TemplatedAdorner.cs