120 lines
3.0 KiB
C#
120 lines
3.0 KiB
C#
//
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// System.Data.SqlClient.DbEnumerator.cs
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//
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// Author:
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// Tim Coleman (tim@timcoleman.com)
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//
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// Copyright (C) Tim Coleman, 2002
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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namespace System.Data.Common {
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public class DbEnumerator : IEnumerator
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{
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#region Fields
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readonly IDataReader reader;
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readonly bool closeReader;
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readonly SchemaInfo [] schema;
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#endregion // Fields
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#region Constructors
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public DbEnumerator (IDataReader reader)
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: this (reader, false)
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{
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}
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public DbEnumerator (IDataReader reader, bool closeReader)
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{
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this.reader = reader;
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this.closeReader = closeReader;
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this.schema = LoadSchema (reader);
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}
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#endregion // Constructors
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#region Properties
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public object Current {
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get {
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// DbDataRecordImpl does not do copy of the array
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// and MoveNext would overwrite any previously filled data
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var values = new object [reader.FieldCount];
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reader.GetValues (values);
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// TODO: Should not allocate on every property call
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return new DbDataRecordImpl (schema, values);
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}
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}
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#endregion // Properties
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#region Methods
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private static SchemaInfo[] LoadSchema (IDataReader reader)
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{
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int fieldCount = reader.FieldCount;
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SchemaInfo[] schema = new SchemaInfo [fieldCount];
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for(int i=0; i < fieldCount; i++) {
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SchemaInfo columnSchema = new SchemaInfo ();
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columnSchema.ColumnName = reader.GetName(i);
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columnSchema.ColumnOrdinal = i;
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columnSchema.DataTypeName = reader.GetDataTypeName (i);
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columnSchema.FieldType = reader.GetFieldType (i);
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schema [i] = columnSchema;
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}
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return schema;
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}
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public bool MoveNext ()
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{
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if (reader.Read ())
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return true;
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if (closeReader)
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reader.Close ();
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return false;
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}
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[EditorBrowsable (EditorBrowsableState.Never)]
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public void Reset ()
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{
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throw new NotSupportedException ();
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}
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#endregion // Methods
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}
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}
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