C# MSSQL数据库类

嘿嘿，今晚无聊写了个MSSQL操作类，算是C#征途的一个起步，博客园的各位朋友尽量拍砖！我的进步靠大家，希望大家不吝赐教！！

1     class MsSql
2     {
3         private string connectString;
4
5         public MsSql(string connString)
6         {
7             connectString = connString;
8         }
9
10         /// <summary>
11         /// 查询数据库，并返回DataSet集
12         /// </summary>
13         /// <param name="cmdString">查询语句</param>
14         /// <returns>返回DataSet</returns>
15         public DataSet GetDataSet(string cmdString)
16         {
17             SqlConnection sqlConn = new SqlConnection(connectString);
18
19             SqlDataAdapter da = new SqlDataAdapter(cmdString, sqlConn);
20             DataSet ds = new DataSet();
21             try
22             {
23                 sqlConn.Open();
24
25                 da.Fill(ds);
26                 //if (ds != null || ds.Tables.Count > 0)
27             }
28             catch (SqlException sqlex)
29             {
30                 Console.WriteLine(sqlex.Message);
31             }
32             sqlConn.Close();
33             return ds;
34         }
35
36         /// <summary>
37         /// 取得表
38         /// </summary>
39         /// <param name="cmdString">查询字符串</param>
40         /// <returns>DataTable</returns>
41         public DataTable GetDataTable(string cmdString)
42         {
43             SqlConnection sqlConn = new SqlConnection(connectString);
44
45             SqlDataAdapter da = new SqlDataAdapter(cmdString, sqlConn);
46             DataSet ds = new DataSet();
47             try
48             {
49                 sqlConn.Open();
50                 da.Fill(ds);
51             }
52             catch (SqlException sqlex)
53             {
54                 Console.WriteLine(sqlex.Message);
55             }
56             DataTable MyDataTable = ds.Tables[0];
57             sqlConn.Close();
58             return MyDataTable;
59         }
60
61         /// <summary>
62         /// 执行sql语句
63         /// </summary>
64         /// <param name="cmdString">查询，更新，删除语句</param>
65         /// <returns>成功返回true,失败返回false</returns>
66         public bool ExecuteQuery(string cmdString)
67         {
68             SqlConnection conn = new SqlConnection(connectString);
69
70             SqlCommand cmd = new SqlCommand(cmdString,conn);
71             cmd.CommandText = cmdString;
72             try
73             {
74                 conn.Open();
75
76                 if (cmd.ExecuteNonQuery() > 0)
77                 {
78                     conn.Close();
79                     return true;
80                 }
81                 else
82                 {
83                     return false;
84                 }
85             }
86             catch (SqlException Sqlex)
87             {
88                 Console.WriteLine(Sqlex.Message);
89                 return false;
90             }

91 }