1: using System;
2: using System.Collections.Generic;
3: using System.Linq;
4: using System.Text;
5: using System.Data;
6: using System.Data.SqlClient;
7: using System.Reflection;
8:
9: namespace DAL
10: {
11: public class SqlHelper
12: {
13: private const string CONNECTION_STRING = @"server=.\sql2008;uid=sa;pwd=;database=BBSDB";
14:
15: private static T ExecuteReader<T>(SqlDataReader dr)
16: {
17: T obj = default(T);
18: obj = Activator.CreateInstance<T>();//T obj = new T();//instance
19: Type type = typeof(T);//get T class type by T's Name
20: PropertyInfo[] propertyInfos = type.GetProperties();//get current Type's all properties
21: int fieldCount = dr.FieldCount;//get column count
22: for (int i = 0; i < fieldCount; i++)
23: {
24: string fieldName = dr.GetName(i);//get column
25: foreach (PropertyInfo propertyInfo in propertyInfos)
26: {//per property infoname
27: string properyName = propertyInfo.Name;//get property name
28: if (string.Compare(fieldName, properyName, true) == 0)
29: {//column's name == propery's name
30: object value = dr.GetValue(i);//get column's value
31: if (value != null && value != DBNull.Value)
32: {
33: propertyInfo.SetValue(obj, value, null);//set property's value
34: }
35: break;
36: }
37: }
38: }
39: return obj;
40: }
41:
42: public static List<T> ExecuteList<T>(string cmdText, CommandType commandType, params SqlParameter[] args)
43: {
44: List<T> list = new List<T>();
45: using (SqlConnection con = new SqlConnection(CONNECTION_STRING))
46: {
47: using (SqlCommand cmd = new SqlCommand(cmdText, con))
48: {
49: cmd.CommandType = commandType;
50: cmd.Parameters.AddRange(args);
51: con.Open();
52: using (SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
53: {
54: while (dr.Read())
55: {
56: //dr.GetInt32(0);
57: //dr.GetString(1);
58: T obj = ExecuteReader<T>(dr);
59: list.Add(obj);
60: }
61: }
62: }
63: }
64: return list;
65: }
66:
67: public static T ExecuteEntity<T>(string cmdText, CommandType commandType, params SqlParameter[] args)
68: {
69: T obj = default(T);
70: using (SqlConnection con = new SqlConnection(CONNECTION_STRING))
71: {
72: using (SqlCommand cmd = new SqlCommand(cmdText, con))
73: {
74: cmd.CommandType = commandType;
75: cmd.Parameters.AddRange(args);
76: con.Open();
77: using (SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
78: {
79: while (dr.Read())
80: {
81: obj = ExecuteReader<T>(dr);
82: break;
83: }
84: }
85: }
86: }
87: return obj;
88: }
89:
90: public static int ExecuteNonQuery(string cmdText, CommandType commandType, params SqlParameter[] args)
91: {
92: int result = -1;
93: using (SqlConnection con = new SqlConnection(CONNECTION_STRING))
94: {
95: using (SqlCommand cmd = new SqlCommand(cmdText, con))
96: {
97: cmd.Parameters.AddRange(args);
98: cmd.CommandType = CommandType.StoredProcedure;
99: con.Open();
100: result = cmd.ExecuteNonQuery();
101: }
102: }
103: return result;
104: }
105:
106: }
107: }
108:
