1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
//
// System.Data.SqlClient.DbEnumerator.cs
//
// Author:
// Tim Coleman (tim@timcoleman.com)
//
// Copyright (C) Tim Coleman, 2002
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
namespace System.Data.Common {
public class DbEnumerator : IEnumerator
{
#region Fields
IDataReader reader;
bool closeReader;
SchemaInfo[] schema;
FieldNameLookup lookup;
int fieldCount;
#endregion // Fields
#region Constructors
public DbEnumerator (IDataReader reader)
: this (reader, false)
{
}
public DbEnumerator (IDataReader reader, bool closeReader)
{
this.reader = reader;
this.closeReader = closeReader;
this.lookup = new FieldNameLookup ();
this.fieldCount = reader.FieldCount;
LoadSchema (reader.GetSchemaTable ());
}
#endregion // Constructors
#region Properties
public object Current {
get {
object[] values = new object[fieldCount];
reader.GetValues (values);
return new DbDataRecord (schema, values, lookup);
}
}
#endregion // Properties
#region Methods
private void LoadSchema (DataTable schemaTable)
{
schema = new SchemaInfo [fieldCount];
int index = 0;
foreach (DataRow row in schemaTable.Rows) {
SchemaInfo columnSchema = new SchemaInfo ();
lookup.Add ((string) row["ColumnName"]);
columnSchema.AllowDBNull = (bool) row ["AllowDBNull"];
columnSchema.ColumnName = row ["ColumnName"].ToString ();
columnSchema.ColumnOrdinal = (int) row ["ColumnOrdinal"];
columnSchema.ColumnSize = (int) row ["ColumnSize"];
columnSchema.DataTypeName = reader.GetDataTypeName (index);
columnSchema.FieldType = reader.GetFieldType (index);
columnSchema.IsReadOnly = (bool) row ["IsReadOnly"];
columnSchema.TableName = row ["BaseTableName"].ToString ();
if (row ["NumericPrecision"] != DBNull.Value)
columnSchema.NumericPrecision = Convert.ToByte (row ["NumericPrecision"]);
else
columnSchema.NumericPrecision = Convert.ToByte (0);
if (row ["NumericScale"] != DBNull.Value)
columnSchema.NumericScale = Convert.ToByte (row ["NumericScale"]);
else
columnSchema.NumericScale = Convert.ToByte (0);
schema [index] = columnSchema;
index += 1;
}
}
public bool MoveNext ()
{
if (reader.Read ())
return true;
if (closeReader)
reader.Close ();
return false;
}
[EditorBrowsable (EditorBrowsableState.Never)]
public void Reset ()
{
throw new NotSupportedException ();
}
#endregion // Methods
}
}
|
