File: DataCommand.cs

package info (click to toggle)
mono 4.6.2.7+dfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: stretch
  • size: 778,148 kB
  • ctags: 914,052
  • sloc: cs: 5,779,509; xml: 2,773,713; ansic: 432,645; sh: 14,749; makefile: 12,361; perl: 2,488; python: 1,434; cpp: 849; asm: 531; sql: 95; sed: 16; php: 1
file content (92 lines) | stat: -rw-r--r-- 3,903 bytes parent folder | download | duplicates (2)
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
#region MIT license
// 
// MIT license
//
// Copyright (c) 2007-2008 Jiri Moudry, Pascal Craponne
// 
// 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.
// 
#endregion

using System;
using System.Collections.Generic;
using System.Data;

namespace DbLinq.Util
{
    /// <summary>
    /// Executes a given SQL command, with parameter and delegate
    /// </summary>
#if !MONO_STRICT
    // TODO: once R# is fixed with internal extension methods problems, switch to full internal
    public // DataCommand is used by vendors
#endif
    static class DataCommand
    {
        /// <summary>
        /// Executes a provided SQL command, with parameter and callback for each row
        /// </summary>
        /// <typeparam name="T">Row type</typeparam>
        /// <param name="conn">Connection to database</param>
        /// <param name="sql">SQL string</param>
        /// <param name="dbParameterName">Optional parameter name (null to ignore), like ':db'</param>
        /// <param name="db">Optional parameter value</param>
        /// <param name="readDelegate">Function called for each row, returning an instance created for row data</param>
        /// <returns></returns>
        public static List<T> Find<T>(IDbConnection conn, string sql, string dbParameterName, string db, Func<IDataReader, T> readDelegate)
        {
            using (IDbCommand command = conn.CreateCommand())
            {
                command.CommandText = sql;
                if (dbParameterName != null)
                {
                    var parameter = command.CreateParameter();
                    parameter.ParameterName = dbParameterName;
                    parameter.Value = db;
                    command.Parameters.Add(parameter);
                }
                using (var rdr = command.ExecuteReader())
                {
                    var list = new List<T>();
                    while (rdr.Read())
                    {
                        var t = readDelegate(rdr);
                        // we may have a value type, here
                        if (!Equals(t, default(T)))
                            list.Add(t);
                    }
                    return list;
                }
            }
        }

        /// <summary>
        /// Executes a provided SQL command, with parameter and callback for each row
        /// </summary>
        /// <typeparam name="T">Row type</typeparam>
        /// <param name="conn">Connection to database</param>
        /// <param name="sql">SQL string</param>
        /// <param name="readDelegate">Function called for each row, returning an instance created for row data</param>
        /// <returns></returns>
        public static List<T> Find<T>(IDbConnection conn, string sql, Func<IDataReader, T> readDelegate)
        {
            return Find<T>(conn, sql, null, null, readDelegate);
        }
    }
}