SqlHelper工具类

 1  public class SqlHlper
 2         {
 3             public static readonly string constr = ConfigurationManager.ConnectionStrings["constr"].ConnectionString;
 4             //执行增删改
 5             public static object ExecuteNonQuery(string sql, params SqlParameter[] pms)//SqlParameter需要调用Data.SqlClient
 6             {
 7                 using (SqlConnection con = new SqlConnection(constr))
 8                 {
 9                     using (SqlCommand cmd = new SqlCommand(sql, con))
10                     {
11                         if (pms != null)
12                         {
13                             cmd.Parameters.AddRange(pms);
14                         }
15                         con.Open();
16                         return cmd.ExecuteNonQuery();
17 
18                     }
19                 }
20             }
21             //获取单个数据
22             public static object ExecteScalar(string sql, params SqlParameter[] pms)
23             {
24                 object obj = null;
25                 using (SqlConnection conn = new SqlConnection(constr))
26                 {
27                     SqlCommand cmd = new SqlCommand(sql, conn);
28                     conn.Open();
29                     if (pms != null)
30                     {
31                         cmd.Parameters.AddRange(pms);
32                     }
33                     obj = cmd.ExecuteScalar();
34                 }
35                 return obj;
36             }
37             //获取多个数据
38             public static SqlDataReader GetDataReader(string sql, params SqlParameter[] sps)
39             {
40                 SqlConnection conn = new SqlConnection(constr);
41                 using (SqlCommand cmd = new SqlCommand(sql, conn))
42                 {
43                     if (sps != null)
44                     {
45                         cmd.Parameters.AddRange(sps);
46                     }
47                     conn.Open();
48                     return cmd.ExecuteReader(CommandBehavior.CloseConnection);
49                 }
50             }
51             //查询多条数据
52             public static DataTable GetDataTable(string sql, params SqlParameter[] sps)
53             {
54                 DataTable dt = new DataTable();
55                 using (SqlDataAdapter da = new SqlDataAdapter(sql, constr))
56                 {
57                     if (sps != null)
58                     {
59                         da.SelectCommand.Parameters.AddRange(sps);
60                     }
61                     da.Fill(dt);
62                 }
63                 return dt;
64             }
65         }

 1   /// <summary>
 2         /// 把对象序列化 JSON 字符串 
 3         /// </summary>
 4         /// <typeparam name="T">对象类型</typeparam>
 5         /// <param name="obj">对象实体</param>
 6         /// <returns>JSON字符串</returns>
 7         public static string GetJson<T>(T obj)
 8         {
 9             DataContractJsonSerializer json = new DataContractJsonSerializer(typeof(T));
10             using (MemoryStream ms = new MemoryStream())
11             {
12                 json.WriteObject(ms, obj);
13                 string szJson = Encoding.UTF8.GetString(ms.ToArray());
14                 return szJson;
15             }
16         }
17         /// <summary>  
18         /// 256位AES加密  
19         /// </summary>  
20         /// <param name="toEncrypt"></param>  
21         /// <returns></returns> 
22         public static string Encrypt(string toEncrypt, string skey, string IV)
23         {
24             //256-AES key      
25             //byte[] keyArray = UTF8Encoding.UTF8.GetBytes("12345678123456781234567812345678");
26             byte[] keyArray = UTF8Encoding.UTF8.GetBytes(skey);
27             byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
28             byte[] ivArray = UTF8Encoding.UTF8.GetBytes(IV);//1234567812345678
29 
30             RijndaelManaged rDel = new RijndaelManaged();
31             rDel.Key = keyArray;
32             rDel.Mode = CipherMode.CBC;
33             rDel.Padding = PaddingMode.PKCS7;
34             rDel.IV = ivArray;
35 
36             ICryptoTransform cTransform = rDel.CreateEncryptor();
37             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
38 
39             return Convert.ToBase64String(resultArray, 0, resultArray.Length);
40         }
41         ///保留小数       
42         public static double Change(double data, int num)
43         {
44             string str1 = "";
45             if (num == 2)
46             {
47                 str1 = String.Format("{0:F2}", data);//默认为保留两位
48             }
49             else if (num == 8)
50             {
51                 str1 = String.Format("{0:F8}", data);//默认为保留8位
52 
53             }
54             return Convert.ToDouble(str1);
55         }

View Code