黑马程序员——数据归属地的实现
//数据库请到我的资源里下载
//这次实现遇到问题了，就是提示变量重定义SqlHelper.ExecuteNonQuery(sql,
// new SqlParameter("@TelNum", telnum),
// new SqlParameter("@TelNumArea", telarea),
// new SqlParameter("@TelNumType", teltype),
// new SqlParameter("@AreaNum", areanum));
//后来改了一下，发现只要每次new 一个cmd就不会出问题。一条cmd只能传一次参数，多次传参须定义不同的"@变量名"
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace _04第四季_三_手机号码
{
/// <summary>
/// MainWindow.xaml 的交互逻辑
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
/// <summary>
/// 调用SqlHelper插入数据，每插入一条需打开关闭数据库，所以效率低下。
/// 更好的办法是一次打开，全部插入，当然如果连接断开则是很麻烦的事情。
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void SqlHelperImport_Click(object sender, RoutedEventArgs e)
{
string sql = @"insert into T_TelNumSearch(TelNum,TelNumArea,TelNumType,AreaNum)
values(@TelNum,@TelNumArea,@TelNumType,@AreaNum)";
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "文本文件|*.txt";
if (ofd.ShowDialog() == false)
{
return;
}
//IEnumerable<string> telNum = File.ReadAllLines(ofd.FileName,Encoding.Default);
//telNum.ElementAt(i);//取到第i个元素
string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray();
DateTime dt = DateTime.Now;
for (int i = 1; i < telNum.Length; ++i)
{
string[] strs = telNum[i].Split('\t');//Tab键转义为“\t”
string telnum = strs[0];
string telarea = strs[1];
string teltype = strs[2];
string areanum = strs[3];
//连接并不是真正关闭，下次会复用
SqlHelper.ExecuteNonQuery(sql,
new SqlParameter("@TelNum", telnum),
new SqlParameter("@TelNumArea", telarea),
new SqlParameter("@TelNumType", teltype),
new SqlParameter("@AreaNum", areanum));
TimeSpan ts = DateTime.Now - dt;
double totalTime = ts.TotalSeconds * telNum.Length / i;
}
MessageBox.Show("共插入" + telNum.Count().ToString() + "条数据");
}
/// <summary>
/// 看起来一次打开插入数据跟,多次打开关闭花的时间差不多,原因:多次打开关闭中并不是真的关闭,而是实现了连接复用
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void btnInsert_Click(object sender, RoutedEventArgs e)
{
string sql = @"insert into T_TelNumSearch(TelNum,TelNumArea,TelNumType,AreaNum)
values(@TelNum,@TelNumArea,@TelNumType,@AreaNum)";
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "文本文件|*.txt";
if (ofd.ShowDialog() == false)
{
return;
}
//IEnumerable<string> telNum = File.ReadAllLines(ofd.FileName,Encoding.Default);
//telNum.ElementAt(i);//取到第i个元素
string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray();
using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=stu;User ID=sa;Password=tao201415shu"))
{
conn.Open();
using(SqlCommand cmd=conn.CreateCommand())//一条cmd只能传一次参数，多次传参须定义不同的"@变量名"
{
DateTime dt = DateTime.Now;
for (int i = 1; i < telNum.Length; ++i)
{
string[] strs = telNum[i].Split('\t');//Tab键转义为“\t”
string telnum = strs[0].Trim('"');
string telarea = strs[1].Trim('"');
string teltype = strs[2].Trim('"');
string areanum = strs[3].Trim('"');
sql = "insert into T_TelNumSearch(TelNum,TelNumArea,TelNumType,AreaNum)values('"+telnum+"','"+telarea+"','"+teltype+"','"+areanum+"')";
cmd.CommandText = sql;
cmd.ExecuteNonQuery();
TimeSpan ts = DateTime.Now - dt;
double totalTime = ts.TotalSeconds * telNum.Length / i;
}
}
}
MessageBox.Show("共插入" + telNum.Count().ToString() + "条数据");
}
// /// <summary>
// /// 错误的写法，cmd参数变量重定义
// /// </summary>
// /// <param name="sender"></param>
// /// <param name="e"></param>
// private void btnInsert_Click(object sender, RoutedEventArgs e)
// {
// string sql = @"insert into T_TelNumSearch(TelNum,TelNumArea,TelNumType,AreaNum)
// values(@TelNum,@TelNumArea,@TelNumType,@AreaNum)";
// OpenFileDialog ofd = new OpenFileDialog();
// ofd.Filter = "文本文件|*.txt";
// if (ofd.ShowDialog() == false)
// {
// return;
// }
// //IEnumerable<string> telNum = File.ReadAllLines(ofd.FileName,Encoding.Default);
// //telNum.ElementAt(i);//取到第i个元素
// string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray();
// using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=stu;User ID=sa;Password=tao201415shu"))
// {
// conn.Open();
// using (SqlCommand cmd = conn.CreateCommand())//一条cmd只能传一次参数，多次传参须定义不同的"@变量名"
// {
// cmd.CommandText = sql;
// DateTime dt = DateTime.Now;
// for (int i = 1; i < telNum.Length; ++i)
// {
// string[] strs = telNum[i].Split('\t');//Tab键转义为“\t”
// string telnum = strs[0].Trim('"');
// string telarea = strs[1].Trim('"');
// string teltype = strs[2].Trim('"');
// string areanum = strs[3].Trim('"');
// SqlParameter[] paramters ={new SqlParameter("@TelNum", telnum),
// new SqlParameter("@TelNumArea", telarea),
// new SqlParameter("@TelNumType", teltype),
// new SqlParameter("@AreaNum", areanum)};
// cmd.Parameters.AddRange(paramters);
// cmd.ExecuteNonQuery();
// TimeSpan ts = DateTime.Now - dt;
// double totalTime = ts.TotalSeconds * telNum.Length / i;
// }
// }
// }
// MessageBox.Show("共插入" + telNum.Count().ToString() + "条数据");
// }
private void btnInsert2_Click(object sender, RoutedEventArgs e)
{
string sql = @"insert into T_TelNumSearch(TelNum,TelNumArea,TelNumType,AreaNum)
values(@TelNum,@TelNumArea,@TelNumType,@AreaNum)";
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "文本文件|*.txt";
if (ofd.ShowDialog() == false)
{
return;
}
//IEnumerable<string> telNum = File.ReadAllLines(ofd.FileName,Encoding.Default);
//telNum.ElementAt(i);//取到第i个元素
string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray();
using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=stu;User ID=sa;Password=tao201415shu"))
{
conn.Open();
DateTime dt = DateTime.Now;
for (int i = 1; i < telNum.Length; ++i)
{
string[] strs = telNum[i].Split('\t');//Tab键转义为“\t”
string telnum = strs[0].Trim('"');
string telarea = strs[1].Trim('"');
string teltype = strs[2].Trim('"');
string areanum = strs[3].Trim('"');
using (SqlCommand cmd = conn.CreateCommand())
{
cmd.CommandText = sql;
SqlParameter[] paramters ={new SqlParameter("@TelNum", telnum),
new SqlParameter("@TelNumArea", telarea),
new SqlParameter("@TelNumType", teltype),
new SqlParameter("@AreaNum", areanum)};
cmd.Parameters.AddRange(paramters);
cmd.ExecuteNonQuery();
}
TimeSpan ts = DateTime.Now - dt;
double totalTime = ts.TotalSeconds * telNum.Length / i;
}
MessageBox.Show("共插入" + telNum.Count().ToString() + "条数据");
}
}
//SqlBulkCopy类，先将数据插入内存中的DataTable中，然后批量提交到数据库
private void btnQuickInsert_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "文本文件|*.txt";
if (ofd.ShowDialog() == false)
{
return;
}
DataTable dataTable = new DataTable();
dataTable.Columns.Add("TelNum");
dataTable.Columns.Add("TelArea");
dataTable.Columns.Add("TelType");
dataTable.Columns.Add("AreaNum");
string[] telNum = File.ReadAllLines(ofd.FileName, Encoding.Default).ToArray();
DateTime dt = DateTime.Now;
for (int i = 1; i < telNum.Length; ++i)
{
string[] strs = telNum[i].Split('\t');//Tab键转义为“\t”
string telnum = strs[0].Trim('"');
string telarea = strs[1].Trim('"');
string teltype = strs[2].Trim('"');
string areanum = strs[3].Trim('"');
DataRow row = dataTable.NewRow();//不能使用new DataRow()因为其是internal类型，不可外部访问
row["TelNum"] = telnum;
row["TelArea"] = telarea;
row["TelType"] = teltype;
row["AreaNum"] = areanum;
dataTable.Rows.Add(row);
}
using(SqlBulkCopy bulkCopy=new SqlBulkCopy("Data Source=.;Initial Catalog=stu;User ID=sa;Password=tao201415shu"))
{
bulkCopy.DestinationTableName = "T_TelNumSearch";
bulkCopy.ColumnMappings.Add("TelNum", "TelNum");//从内存映射到数据库的列名
bulkCopy.ColumnMappings.Add("TelArea", "TelNumArea");
bulkCopy.ColumnMappings.Add("TelType", "TelNumType");
bulkCopy.ColumnMappings.Add("AreaNum", "AreaNum");
bulkCopy.WriteToServer(dataTable);
}
TimeSpan ts=DateTime.Now-dt;
MessageBox.Show(ts.ToString());
}
}
}