使用用户自定义类型 CLR UDT

标签：

? ?

一些复合类型进行范式分解是没有必要的，尤其是一些统一模型的情况下

? ?

DECLARE @i TimeBalance

SET @i = CAST(‘0/102‘ AS TimeBalance)

SELECT @i

SELECT @i.ToString()

SELECT @i.ToTimeString()

SELECT @i.Distance()

SELECT @i.Distance2(‘mi‘)

? ?

SET @i = CAST(‘2015-1-1/2016-8-21‘ AS TimeBalance)

SELECT @i.ToString() string ,

@i.ToTimeString() timeString ,

@i.Distance() distance ,

@i.Distance2(‘m‘) distanceMonth

? ?

? ?

? ?

?

相关资料：

?

TSql vs. SQL CLR Performance Analysis

?

CLR 集成的性能

操作 UDT 数据

?

? ?

1. /// <summary>
2. /// 时间钱包余额类型
3. ///
4. /// </summary>
5. /// <remarks>
6. /// 基于长整型，结构如下:
7. /// 起始UTC秒数4B，结束UTC秒数4B
8. /// </remarks>
9. /// <see cref="https://msdn.microsoft.com/en-us/library/ms131086.aspx"/>
10. [Serializable]
11. [Microsoft.SqlServer.Server.SqlUserDefinedType(Format.Native)]
12. public struct TimeBalance : INullable
13. {
14. ????public override string ToString()
15. ????{
16. ? ?
17. ????????return string.Format("{0}/{1}", startSecond, endSecond);
18. ????}
19. ? ?
20. ????public string ToTimeString()
21. ????{
22. ????????return string.Format("{0}/{1}", UTCSecondToDateTime(startSecond).ToString("yyyy-MM-dd HH:mm:ss"), UTCSecondToDateTime(endSecond).ToString("yyyy-MM-dd HH:mm:ss"));
23. ????}
24. ? ?
25. ????public static TimeBalance Parse(SqlString s)
26. ????{
27. ????????if (s.IsNull)
28. ????????????return Null;
29. ? ?
30. ????????TimeBalance u = new TimeBalance();
31. ????????if (s.Value.Contains("-"))
32. ????????{
33. ????????????u.startSecond = DateTimeToUTCSecond(DateTime.Parse(s.Value.Split(‘/‘)[0]));
34. ????????????u.endSecond = DateTimeToUTCSecond(DateTime.Parse(s.Value.Split(‘/‘)[1]));
35. ????????}else
36. ????????if (s.Value.Contains("/"))
37. ????????{
38. ????????????u.startSecond = int.Parse(s.Value.Split(‘/‘)[0]);
39. ????????????u.endSecond = int.Parse(s.Value.Split(‘/‘)[1]);
40. ????????}
41. ????????else
42. ????????{
43. ????????????byte[] bs = BitConverter.GetBytes(long.Parse(s.Value));
44. ????????????u.startSecond = BitConverter.ToInt32(bs, 0);
45. ????????????u.endSecond = BitConverter.ToInt32(bs, 4);
46. ? ?
47. ????????}
48. ????????return u;
49. ????}
50. ? ?
51. ? ?
52. ? ?
53. ? ?
54. ????public bool IsNull
55. ????{
56. ????????get
57. ????????{
58. ????????????// 在此处放置代码
59. ????????????return _null;
60. ????????}
61. ????}
62. ? ?
63. ????public static TimeBalance Null
64. ????{
65. ????????get
66. ????????{
67. ????????????TimeBalance h = new TimeBalance();
68. ????????????h._null = true;
69. ????????????return h;
70. ????????}
71. ????}
72. ? ?
73. ? ?
74. ????public double Distance2(SqlString type)
75. ????{
76. ????????switch (type.Value.ToLower())
77. ????????{
78. ????????????case "y":
79. ????????????????return UTCSecondToDateTime(endSecond).Year - UTCSecondToDateTime(startSecond).Year;
80. ????????????case "m":
81. ????????????????return UTCSecondToDateTime(endSecond).Year * 12 + UTCSecondToDateTime(endSecond).Month - UTCSecondToDateTime(startSecond).Year * 12 - UTCSecondToDateTime(startSecond).Month;
82. ????????????case "d":
83. ????????????????return new TimeSpan(0, 0, 0, endSecond - startSecond).TotalDays;
84. ????????????case "h":
85. ????????????????return new TimeSpan(0, 0, 0, endSecond - startSecond).TotalHours;
86. ????????????case "mi":
87. ????????????????return new TimeSpan(0, 0, 0, endSecond - startSecond).TotalMinutes;
88. ? ?
89. ????????????case "s":
90. ????????????default:
91. ????????????????return endSecond - startSecond;
92. ????????}
93. ????}
94. ????public string Distance()
95. ????{
96. ????????return new TimeSpan(0, 0, 0, endSecond - startSecond).ToString();
97. ? ?
98. ????}
99. ????#region 获取UTC
100. ? ?
101. ????public static int DateTimeToUTCSecond(DateTime dateTime)
102. ????{
103. ????????return (int)dateTime.ToUniversalTime().Subtract(UTC).TotalSeconds;
104. ????}
105. ? ?
106. ????static DateTime UTCSecondToDateTime(int second)
107. ????{
108. ????????return UTC.AddSeconds(second).ToLocalTime();
109. ????}
110. ????#endregion
111. ? ?
112. ????// 这是占位符成员字段
113. ????public int startSecond;
114. ????public int endSecond;
115. ????public static readonly DateTime UTC = TimeZoneInfo.ConvertTimeToUtc(new DateTime(1970, 1, 1), TimeZoneInfo.Utc);
116. ????// 私有成员
117. ????private bool _null;
118. }

? ?

? ?

??

使用用户自定义类型 CLR UDT

标签：

原文地址：http://www.cnblogs.com/QinQouShui/p/4557020.html