今天的收获

今天学习了using(SqlConnection cnn = new ...)
{
}
使用这个方法可以不用使用dispopse()释放资源,也可以不用关闭连接
ADO.NET Transaction的使用包括以下几个步骤:

1. 建立数据库联接.

2. 依据数据库联接创建事务

3. 执行语句

4. 提交或回滚事物
SqlTransaction trans = sqlcnn.BeginTransaction();//为事物创建对象
sqlcmm.Transaction = trans; //为命令对象指定事物对象
trans.Commit(); //提交事物
trans.Rollback(); //回滚事物
导入txt文档信息

protected void Button1_Click(object sender, EventArgs e)

{

string strfile = Server.MapPath("~/" + "user.txt");

this.FileUpload1.SaveAs(strfile);

FileStream fs = new FileStream(strfile,FileMode.Open);

StreamReader sr = new StreamReader(fs);

string str = ConfigurationManager.ConnectionStrings["sqlcon"].ConnectionString;

using(SqlConnection sqlcnn=new SqlConnection(str))

{

SqlCommand sqlcmm = new SqlCommand();

sqlcmm.Connection = sqlcnn;

sqlcmm.CommandText = "insert into users(uid,name,power) values(@uid,@name,@power)";

SqlParameter param1 = new SqlParameter("@uid",System.Data.SqlDbType.VarChar, 6);

sqlcmm.Parameters.Add(param1);

SqlParameter param2 = new SqlParameter("@name",System.Data.SqlDbType.NVarChar, 8);

sqlcmm.Parameters.Add(param2);

SqlParameter param3 = new SqlParameter("@power", DropDownList1.SelectedValue);

sqlcmm.Parameters.Add(param3);

string line = sr.ReadLine();

string[] items = null;

sqlcnn.Open();

while (line!=null)

{

items = line.Split(';');

param1.Value = items[0];

param2.Value = items[1];

switch (items[2])

{

case "管理员":

param3.Value = 0;

break;

case "售票员":

param3.Value = 1;

break;

case "检票员":

param3.Value = 2;

break;

}

sqlcmm.ExecuteNonQuery();

line = sr.ReadLine();

}

Response.Write("OK");

}

sr.Close();

fs.Close();

}