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1 office 1 //
2 // System.Data.SqlClient.DbEnumerator.cs
3 //
4 // Author:
5 // Tim Coleman (tim@timcoleman.com)
6 //
7 // Copyright (C) Tim Coleman, 2002
8 //
9  
10 //
11 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
12 //
13 // Permission is hereby granted, free of charge, to any person obtaining
14 // a copy of this software and associated documentation files (the
15 // "Software"), to deal in the Software without restriction, including
16 // without limitation the rights to use, copy, modify, merge, publish,
17 // distribute, sublicense, and/or sell copies of the Software, and to
18 // permit persons to whom the Software is furnished to do so, subject to
19 // the following conditions:
20 //
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
23 //
24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 //
32  
33 using System;
34 using System.Collections;
35 using System.ComponentModel;
36 using System.Data;
37  
38 namespace System.Data.Common {
39 public class DbEnumerator : IEnumerator
40 {
41 #region Fields
42  
43 readonly IDataReader reader;
44 readonly bool closeReader;
45 readonly SchemaInfo [] schema;
46 readonly object [] values;
47  
48 #endregion // Fields
49  
50 #region Constructors
51  
52 public DbEnumerator (IDataReader reader)
53 : this (reader, false)
54 {
55 }
56  
57 public DbEnumerator (IDataReader reader, bool closeReader)
58 {
59 this.reader = reader;
60 this.closeReader = closeReader;
61 this.values = new object [reader.FieldCount];
62 this.schema = LoadSchema (reader);
63 }
64  
65 #endregion // Constructors
66  
67 #region Properties
68  
69 public object Current {
70 get {
71 reader.GetValues (values);
72 return new DbDataRecordImpl (schema, values);
73 }
74 }
75  
76 #endregion // Properties
77  
78 #region Methods
79  
80 private static SchemaInfo[] LoadSchema (IDataReader reader)
81 {
82 int fieldCount = reader.FieldCount;
83 SchemaInfo[] schema = new SchemaInfo [fieldCount];
84  
85 for(int i=0; i < fieldCount; i++) {
86 SchemaInfo columnSchema = new SchemaInfo ();
87  
88 columnSchema.ColumnName = reader.GetName(i);
89 columnSchema.ColumnOrdinal = i;
90 columnSchema.DataTypeName = reader.GetDataTypeName (i);
91 columnSchema.FieldType = reader.GetFieldType (i);
92  
93 schema [i] = columnSchema;
94 }
95  
96 return schema;
97 }
98  
99 public bool MoveNext ()
100 {
101 if (reader.Read ())
102 return true;
103 if (closeReader)
104 reader.Close ();
105 return false;
106 }
107  
108 [EditorBrowsable (EditorBrowsableState.Never)]
109 public void Reset ()
110 {
111 throw new NotSupportedException ();
112 }
113  
114 #endregion // Methods
115 }
116 }