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