柚子快报邀请码778899分享：步步为营-39-数据的导入导出
说明:数据的导入导出功能在企业中还是比较常用的,下面先介绍txt文件的导入导出,但是企业中一般是用Excel导入导出
1 先建UI页面
2清空数据库数据
3 导入数据
4导出数据
代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Win32.SafeHandles;
namespace UserLogin
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
//导入
private void btnImport_Click(object sender, EventArgs e)
{
//1、找到文件--这里使用OpenfileDialog类
using (OpenFileDialog ofd = new OpenFileDialog())
{
//1-01设置标题
ofd.Title = "请选择要导入的文件";
//1-02设置初识路径
ofd.InitialDirectory = @"C:\Users\home\Desktop";
//1-03 设置文件类型
ofd.Filter = "文本文件|*.txt";
if (ofd.ShowDialog() == DialogResult.OK)
{
this.txtSelectFile.Text = ofd.FileName;
//导入数据
ImportData(ofd.FileName);
MessageBox.Show("导入成功");
}
}
}
//导出
private void btnExport_Click(object sender, EventArgs e)
{
//1、找到文件--这里使用OpenfileDialog类
using (OpenFileDialog ofd = new OpenFileDialog())
{
//1-01设置标题
ofd.Title = "请选择要导出的文件路径";
//1-02设置初识路径
ofd.InitialDirectory = @"C:\Users\home\Desktop";
//1-03 设置文件类型
ofd.Filter = "文本文件|*.txt";
if (ofd.ShowDialog() == DialogResult.OK)
{
this.txtExport.Text = ofd.FileName;
//导入数据
ExportData();
MessageBox.Show("导出成功");
}
}
}
private void ImportData(string fileName)
{
string temp = string.Empty;
//2、读取文件
using (StreamReader reader = new StreamReader(fileName,Encoding.UTF8))
{
reader.ReadLine();//去掉第一行
//32-01连接数据库字符串
string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
//3-02创建连接对象
SqlConnection conn = new SqlConnection(connStr);
using (conn)
{
//3-03创建数据库执行对象
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
conn.Open();
using (cmd)
{
//如果下一行数据不为空,继续执行
while (!string.IsNullOrEmpty(temp = reader.ReadLine()))
{
string[] strs = temp.Split(new string[]{"\t"}, StringSplitOptions.RemoveEmptyEntries);
//创建sql语句
cmd.CommandText = string.Format("insert into UserInfo ( Pwd, StuName, StuAge, Delflag, ClassNo) values ({0},'{1}',{2},{3},{4})", strs[1], strs[2], strs[3], strs[4], strs[5]);
cmd.ExecuteNonQuery();
}
}
}
}
}
private void ExportData()
{
//连接数据库字符串
//32-01连接数据库字符串
string connStr = ConfigurationManager.ConnectionStrings["connStr"].ConnectionString;
//3-02创建连接对象
SqlConnection conn = new SqlConnection(connStr);
using (conn)
{
conn.Open();
using (System.Data.SqlClient.SqlCommand command = conn.CreateCommand())
{
command.CommandText = "select * from UserInfo";
using (System.Data.SqlClient.SqlDataAdapter adp = new System.Data.SqlClient.SqlDataAdapter(command))
{
System.Data.DataTable dt = new System.Data.DataTable();
adp.Fill(dt);
DataRow[] myRow = dt.Select();
int cl = dt.Columns.Count;
if (cl <= 0)
{
MessageBox.Show("数据不存在");
}
using (FileStream fsWrite= new FileStream(txtExport.Text.Trim(),FileMode.OpenOrCreate,FileAccess.Write))
{
#region 写数据
//逐行写入数据
foreach (DataRow row in myRow)
{
string ls_item = string.Empty;
for (int i = 0; i < cl; i++)
{
if (i == (cl - 1))
{
ls_item += row[i].ToString() + "\r\n";
}
else
{
ls_item += row[i].ToString() + "\t";
}
}
byte[] buffer = Encoding.UTF8.GetBytes(ls_item);
fsWrite.Write(buffer, 0, buffer.Length);
}
#endregion
}
}
}
}
}
}
}
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柚子快报邀请码778899分享：步步为营-39-数据的导入导出
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