黑马程序员-day5-数据导入导出

                ------------- Windows phone 手机开发 、ASP .NET培训、期待与您交流！----------------

        最近刚学完ADO.NET,做了个数据导入导出的题目，是将txt中的数据导入数据库，然后将数据库中的数据导出到txt中，这里说的数据的格式是“tom|23”，tom指名字，23指年龄。

废话也不多说了，大家直接看代码。

            

        private void button1_Click(object sender, EventArgs e)        {            if (openFileDialog1.ShowDialog() == DialogResult.OK)            {                using (FileStream fs = File.OpenRead(openFileDialog1.FileName))                {                    using (StreamReader sr = new StreamReader(fs, System.Text.Encoding.GetEncoding("GB2312")))                    {//必需设置字符编码System.Text.Encoding.GetEncoding("GB2312")，不然string name = arr[0]中的name就是乱码                        using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename='|DataDirectory|\dd.mdf';Integrated Security=True;User Instance=True"))                        {//DataDirectory指的是数据库的绝对路径，winForm里面的Program.cs必需添加代码，否则是.NET是找到的数据库是有问题的，实在不懂可以去博客园自己去看看why                            conn.Open();                            using (SqlCommand cmd = conn.CreateCommand())                            {                                cmd.CommandText = "insert into T_Persons values(@Name,@Age)";                                string line = "";                                while ((line = sr.ReadLine()) != null)                                {                                    string[] arr = line.Split('|');                                    string name = arr[0];                                    int age = Convert.ToInt32(arr[1]);                                    cmd.Parameters.Clear();//别忘了                                    cmd.Parameters.Add(new SqlParameter("Name", name));                                    cmd.Parameters.Add(new SqlParameter("Age", age));                                    cmd.ExecuteNonQuery();                                }                            }                        }                    }                }                MessageBox.Show("txt导入数据库成功!");            }                    }        private void button2_Click(object sender, EventArgs e)        {            if (saveFileDialog1.ShowDialog() == DialogResult.OK)            {                using (FileStream fs = File.OpenWrite(saveFileDialog1.FileName))                {                    using (StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.GetEncoding("GB2312")))                    {                        using (SqlConnection conn = new SqlConnection(@"Data Source=.\SQLEXPRESS;AttachDbFilename='|DataDirectory|\dd.mdf';Integrated Security=True;User Instance=True"))                        {                             conn.Open();                            using (SqlCommand cmd = conn.CreateCommand())                            {                                cmd.CommandText = "select * from T_Persons";                                using (SqlDataReader sdr = cmd.ExecuteReader())                                {                                                                        while (sdr.Read())                                    {                                        string name = sdr.GetString(sdr.GetOrdinal("Name"));                                        int age = sdr.GetInt32(sdr.GetOrdinal("Age"));                                        string line =name+"|"+age;                                        sw.WriteLine(line);                                        sw.Flush();                                    }                                                                    }                            }                        }                    }                }                MessageBox.Show("导出数据到txt成功！");            }        }

       这是要在Program.cs文件中添加的代码，它只对winForm和win控制台有效：

       

  static void Main()        {            string dataDir = AppDomain.CurrentDomain.BaseDirectory;            if (dataDir.EndsWith(@"\bin\Debug\")                || dataDir.EndsWith(@"\bin\Release\"))            {                dataDir = System.IO.Directory.GetParent(dataDir).Parent.Parent.FullName;                AppDomain.CurrentDomain.SetData("DataDirectory", dataDir);            }            Application.EnableVisualStyles();            Application.SetCompatibleTextRenderingDefault(false);            Application.Run(new Form1());        }

      ------------- Windows phone 手机开发 、ASP .NET培训、期待与您交流！----------------