SqlHelper

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Data.SqlClient;
 6 using System.Configuration;
 7 using System.Data;
 8 
 9 namespace adonet
10 {
11     class SqlHelper
12     {
13         private static string connStr = ConfigurationManager.ConnectionStrings["dbConnStr"].ConnectionString;
14 
15         public static int ExecuteNonQuery(string sql, params SqlParameter[] parameters)
16         {
17             using (SqlConnection conn = new SqlConnection(connStr))
18             {
19                 conn.Open();
20                 using (SqlCommand cmd = conn.CreateCommand())
21                 {
22                     cmd.CommandText = sql;
23                     cmd.Parameters.AddRange(parameters);
24                     return cmd.ExecuteNonQuery();
25                 }
26             }
27         }
28 
29         public static object ExecuteScalar(string sql, params SqlParameter[] parameters)
30         {
31             using (SqlConnection conn = new SqlConnection(connStr))
32             {
33                 conn.Open();
34                 using (SqlCommand cmd = conn.CreateCommand())
35                 {
36                     cmd.CommandText = sql;
37                     cmd.Parameters.AddRange(parameters);
38                     return cmd.ExecuteScalar();
39                 }
40             }
41         }
42 
43         public static DataTable ExecuteDataTable(string sql, params SqlParameter[] parameters)
44         {
45             using (SqlConnection conn = new SqlConnection(connStr))
46             {
47                 conn.Open();
48                 using (SqlCommand cmd = conn.CreateCommand())
49                 {
50                     cmd.CommandText = sql;
51                     cmd.Parameters.AddRange(parameters);
52 
53                     SqlDataAdapter adapter = new SqlDataAdapter(cmd);
54                     DataSet dataset=new DataSet();
55                     adapter.Fill(dataset);
56                     return dataset.Tables[0];
57                 }
58             }
59         }
60     }
61 }