sqlserver database access helper class

 

1  ///  <summary> 
2  /// Database access helper class
 3  ///  </summary> 
4  public  static  class DbHelper
 5  {
 6  private  const  string ConnStr = " server=127.0.0.1;database=db_test;Uid=user1 ;Pwd=Ps123321; " ;
 7  
8  
9  ///  <summary> 
10  /// Execute addition, deletion,
 modification 11  ///  </summary> 
12  ///  <param name="sql"></param> 
13  ///  <param name="sqlParams"></param>
14 /// <returns></returns>
15 public static int ExecuteNonQuery(string sql, params SqlParameter[] sqlParams)
16 {
17     using (SqlConnection conn = new SqlConnection(ConnStr))
18     {
19         conn.Open();
20         using (SqlCommand comm = conn.CreateCommand())
21         {
22             comm.CommandText = sql;
23             comm.CommandType = CommandType.Text;
24             if (sqlParams != null)
25                 comm.Parameters.AddRange(sqlParams);
26             return comm.ExecuteNonQuery();
27         }
28     }
29 }
30 
31 /// <summary>
32 /// 返回1个查询结果
33 /// </summary>
34 /// <param name="sql"></param>
35 /// <param name="sqlParams"></param>
36 /// <returns></returns>
37 public static object ExecuteScalar(string sql, params SqlParameter[] sqlParams)
38 {
39     using (SqlConnection conn = new SqlConnection(ConnStr))
40     {
41         conn.Open();
42         using (SqlCommand comm = conn.CreateCommand())
43         {
44             comm.CommandText = sql;
45             comm.CommandType = CommandType.Text;
46             if (sqlParams != null)
47                 comm.Parameters.AddRange(sqlParams);
48             return comm.ExecuteScalar();
49         }
 50      }
 51  }
 52  
53  ///  <summary> 
54  /// Return the query, return the result set
 55  ///  </summary> 
56  ///  <param name="sql"></param> 
57  // /  <param name="sqlParams"></param> 
58  ///  <returns></returns> 
59  public  static DataTable ExecuteQuery( string sql,params SqlParameter[] sqlParams)
60 {
61     using (SqlConnection conn = new SqlConnection(ConnStr))
62     {
63         conn.Open();
64         using (SqlCommand comm = conn.CreateCommand())
65         {
66             comm.CommandText = sql;
67             comm.CommandType = CommandType.Text;
68             if (sqlParams!=null)
69                 comm.Parameters.AddRange(sqlParams);
70             using (SqlDataAdapter adp = new SqlDataAdapter(comm))
71             {
72                 DataSet ds = new DataSet();
73                 adp.Fill(ds);
74                 return ds.Tables[0];
75             }
76         }
77     }
78 }
79 }