简单的ORM

自定义属性：

自定义属性
 1using System;
 2using System.ComponentModel;
 3
 4namespace Relaction.ORM
 5{
 6    /**//// <summary>
 7    /// 
 8    /// </summary>
 9    /// 
10    [AttributeUsage(AttributeTargets.Property,Inherited = false,AllowMultiple = false)]
11    public class ColumnAttribute:Attribute
12    {
13        private string _columnName = null;
14        public string ColumnName
15        {
16            get
17            {
18                return _columnName;
19            }
20        }
21
22        public ColumnAttribute(string columnName)
23        {
24            _columnName = columnName;
25        }
26    }
27}
28

实体类：

实体类，并添加上相应属性
 1using System;
 2
 3namespace Relaction.ORM
 4{
 5    /**//// <summary>
 6    /// 
 7    /// </summary>
 8    public class Customer
 9    {
10        private string _customerID,_companyName,_contactName;
11        [Column("CustomerID")]
12        public string CustomerID
13        {
14            get
15            {
16                return _customerID;
17            }
18            set
19            {
20                _customerID = value;
21            }
22
23        }
24        [Column("CompanyName")]
25        public string CompanyName
26        {
27            get
28            {
29                return _companyName;
30            }
31            set
32            {
33                _companyName = value;
34            }
35        }
36        [Column("ContactName")]
37        public string ContactName
38        {
39            get
40            {
41                return _contactName;
42            }
43            set
44            {
45                _contactName = value;
46            }
47        }
48        public Customer()
49        {
50        }
51    }
52}
53

简单的ORM Helper

ORM Helper
 1using System;
 2
 3using System.Collections;
 4using System.ComponentModel;
 5using System.Reflection;
 6using System.Data;
 7using System.Data.Common;
 8
 9namespace Relaction.ORM
10{
11    /**//// <summary>
12    /// 
13    /// </summary>
14    public class FillHelper
15    {
16        public static IList Fill(Type rowType,IDataReader reader)
17        {
18            ArrayList dataList = new ArrayList();
19            while(reader.Read())
20            {
21                object item = Activator.CreateInstance(rowType,false);
22                foreach(MemberInfo mi in rowType.GetMembers())
23                {
24                    foreach(ColumnAttribute attr in mi.GetCustomAttributes(typeof(ColumnAttribute),false))
25                    {
26                        int index = reader.GetOrdinal(attr.ColumnName);
27                        if(index != -1 )
28                        {
29                            if(mi.MemberType == MemberTypes.Field)
30                                ((FieldInfo)mi).SetValue(item,reader.GetValue(index));
31                            else
32                                if(mi.MemberType == MemberTypes.Property)
33                                    ((PropertyInfo)mi).SetValue(item,reader.GetValue(index),null);
34                        }
35                    }
36                } 
37                dataList.Add(item);
38            }
39            return dataList;
40        }
41        public FillHelper()
42        {
43        }
44    }
45}
46

转载于:https://www.cnblogs.com/nanshouyong326/archive/2006/11/28/574842.html