描述一个数据表
1
/// <summary>
2
/// 描述一个数据表
3
/// </summary>
4
public
class
Table
5
{
6
7 protected Table(string name, ColumnCollection cols)
8
{
9 TableName = name;
10 Columns = cols;
11 Rows = new RowCollection();
12
}
13
14 /// <summary>
15 /// 获取或设置表的列架构
16 /// </summary>
17 protected readonly ColumnCollection Columns;
18 /// <summary>
19 /// 获取或设置表的数据行
20 /// </summary>
21 protected RowCollection Rows;
22 /// <summary>
23 /// 获取或设置表的名称
24 /// </summary>
25 protected readonly string TableName;
26
27 /// <summary>
28 /// 将该行数据状态改为RowState.Unchanged
29 /// </summary>
30 protected void AcceptChanges()
31 {
32 for (int i = 0; i <= Rows.Count - 1; i++)
33 {
34 Rows[i].AcceptChanges();
35 }
36 }
37
38 /// <summary>
39 /// 移除所有数据行
40 /// </summary>
41 protected void Clear()
42 {
43 this.Rows.Clear();
44 }
45
46 /// <summary>
47 /// 返回状态匹配的数据行，并以新数据表的形式体现
48 /// </summary>
49 /// <param name="rowState"></param>
50 /// <returns></returns>
51 protected Table GetChanges(RowState rowState)
52 {
53 Table tmpTable = new Table(rowState.ToString(), this.Columns);
54 foreach (Row row in Rows)
55 {
56 if (row.RowState == rowState)
57 {
58 tmpTable.Rows.Add(row);
59 }
60 }
61 return tmpTable;
62
63 }
64
65 /// <summary>
66 /// 依据现有的数据表的架构，生成新的数据行
67 /// </summary>
68 /// <returns></returns>
69 protected Row NewRow()
70 {
71 return new Row(Columns, this.TableName);
72 }
73
74 /// <summary>
75 /// 按关键字（数据行的第一列）匹配，并返回符合的数据行
76 /// </summary>
77 /// <param name="filterKey"></param>
78 /// <returns></returns>
79 protected Row[] Select(string filterKey)
80 {
81 System.Collections.ArrayList tmpRows = new System.Collections.ArrayList();
82 foreach (Row row in Rows)
83 {
84 if (row[0].ToString() == filterKey)
85 {
86 tmpRows.Add(row);
87 }
88 }
89 return (Row[])tmpRows.ToArray(typeof(Row));
90 }
91
92 /// <summary>
93 /// 打印Table的数据
94 /// </summary>
95 public virtual void Print()
96 {
97 System.Text.StringBuilder sb = new StringBuilder();
98
99 foreach (Column col in this.Columns)
100 {
101 sb.AppendFormat("{0}/t", col.ColumnName);
102 }
103 sb.AppendLine();
104 System.Console.WriteLine(sb.ToString());
105 foreach (Row row in this.Rows)
106 {
107 foreach (object obj in row.ItemArray)
108 {
109 System.Console.Write("{0}/t", obj);
110 }
111 System.Console.WriteLine();
112 }
113 }
114 }
/// <summary>2
/// 描述一个数据表3
/// </summary>
4
public
class
Table5
{6
7
protected Table(string name, ColumnCollection cols)8
{9
TableName = name;10
Columns = cols;11
Rows = new RowCollection();12
}13
14
/// <summary>15
/// 获取或设置表的列架构16
/// </summary>17
protected readonly ColumnCollection Columns;18
/// <summary>19
/// 获取或设置表的数据行20
/// </summary>21
protected RowCollection Rows;22
/// <summary>23
/// 获取或设置表的名称24
/// </summary>25
protected readonly string TableName;26
27
/// <summary>28
/// 将该行数据状态改为RowState.Unchanged29
/// </summary>30
protected void AcceptChanges()31
{32
for (int i = 0; i <= Rows.Count - 1; i++)33
{34
Rows[i].AcceptChanges();35
}36
}37
38
/// <summary>39
/// 移除所有数据行40
/// </summary>41
protected void Clear()42
{43
this.Rows.Clear();44
}45
46
/// <summary>47
/// 返回状态匹配的数据行，并以新数据表的形式体现48
/// </summary>49
/// <param name="rowState"></param>50
/// <returns></returns>51
protected Table GetChanges(RowState rowState)52
{53
Table tmpTable = new Table(rowState.ToString(), this.Columns);54
foreach (Row row in Rows)55
{56
if (row.RowState == rowState)57
{58
tmpTable.Rows.Add(row);59
}60
}61
return tmpTable;62
63
}64
65
/// <summary>66
/// 依据现有的数据表的架构，生成新的数据行67
/// </summary>68
/// <returns></returns>69
protected Row NewRow()70
{71
return new Row(Columns, this.TableName);72
}73
74
/// <summary>75
/// 按关键字（数据行的第一列）匹配，并返回符合的数据行76
/// </summary>77
/// <param name="filterKey"></param>78
/// <returns></returns>79
protected Row[] Select(string filterKey)80
{81
System.Collections.ArrayList tmpRows = new System.Collections.ArrayList();82
foreach (Row row in Rows)83
{84
if (row[0].ToString() == filterKey)85
{86
tmpRows.Add(row);87
}88
}89
return (Row[])tmpRows.ToArray(typeof(Row));90
}91
92
/// <summary>93
/// 打印Table的数据94
/// </summary>95
public virtual void Print()96
{97
System.Text.StringBuilder sb = new StringBuilder();98
99
foreach (Column col in this.Columns)100
{101
sb.AppendFormat("{0}/t", col.ColumnName);102
}103
sb.AppendLine();104
System.Console.WriteLine(sb.ToString());105
foreach (Row row in this.Rows)106
{107
foreach (object obj in row.ItemArray)108
{109
System.Console.Write("{0}/t", obj);110
}111
System.Console.WriteLine();112
}113
}114
}
好，到此Table所涉及的5个类都定义实现完毕了。
我们来回顾一下，Table中什么是最基础的，什么是最重要的？
按我们一般来看，表中最重要基础的实行，最重要的是数据。其实表最基础是的架构，架构就是列的定义，而行只不过是列的数据体现形式。
所以Table在构造的时候，必须先定义列的集合，而Row的构造函数是protected internal的，意义是不能在外面被构造，必须通过Table来依据列的定义来构造。
下篇，我们将看到我们对Table的继承，发挥更多OO体现。
本文转自shyleoking 51CTO博客，原文链接:http://blog.51cto.com/shyleoking/806271
