zoukankan      html  css  js  c++  java
  • C#数据库数据导入导出系列之四 WinForm数据库导入导出到Excel

    C#数据库数据导入导出系列之四 WinForm数据库导入导出到Excel

    在日常的项目中,Excel,Word,txt等格式的数据导入到数据库中是很常见的,我在这里做一下总结

    这里将分为Asp.net导入Sql Server,Oracle数据库和WinForm导入Sql Server,Oracle数据库。

    这里将的数据库数据库导入导出,其实对Sql Server 和Oracle都是通用的

    如果使用ADO.Net连接Oracle数据库,需要在引用里添加“System.Data.OracleClient ”,其他方面与连接Sql Server数据库是一样的

    SqlConnection cn = new SqlConnection();
    OracleConnection oraleCn = new OracleConnection();

    如果使用诸如Ibatis等持久层框架的话,唯一的区别就是在数据库连接语句上的差别而已。下面是两个例子

    Oracle:Data Source=192.168.0.11/Contact;User ID=system;Password=ss;Unicode=True

    Sql Server: Data Source=Contact;Server=localhost;uid=sa;pwd=ss

    1,数据库导出到Excel

    先看界面

    1

    然后是代码

    View Code
      1 using System;
      2 using System.Collections.Generic;
      3 using System.ComponentModel;
      4 using System.Data;
      5 using System.Drawing;
      6 using System.Linq;
      7 using System.Text;
      8 using System.Windows.Forms;
      9 using System.Diagnostics;
     10 using Microsoft.Office.Interop.Excel;
     11 using System.Reflection;
     12 using System.IO;
     13 using System.Data.SqlClient;
     14 using System.Data.OracleClient;
     15 
     16 namespace SqlServer__Excel
     17 {
     18     public partial class SqlDB_To_Excel : Form
     19     {
     20         public SqlDB_To_Excel()
     21         {
     22             InitializeComponent();
     23         }
     24 
     25         private Microsoft.Office.Interop.Excel.Application myExcel = null;
     26 
     27         private void button1_Click(object sender, EventArgs e)
     28         {
     29             print(dataGridView1);
     30         }
     31 
     32         public void print(DataGridView dataGridView1)
     33         {
     34             //导出到execl   
     35             try
     36             {
     37                 SaveFileDialog saveFileDialog = new SaveFileDialog();
     38                 saveFileDialog.Filter = "导出Excel (*.xls)|*.xls";
     39                 saveFileDialog.FilterIndex = 0;
     40                 saveFileDialog.RestoreDirectory = true;
     41                 saveFileDialog.CreatePrompt = true;
     42                 saveFileDialog.Title = "导出文件保存路径";
     43                 saveFileDialog.ShowDialog();
     44                 string strName = saveFileDialog.FileName;
     45                 if(strName.Length != 0)
     46                 {
     47                     //没有数据的话就不往下执行   
     48                     if(dataGridView1.Rows.Count == 0)
     49                         return;
     50 
     51                     // toolStripProgressBar1.Visible = true;
     52                     System.Reflection.Missing miss = System.Reflection.Missing.Value;
     53                     //实例化一个Excel.Application对象
     54                     Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
     55                     excel.Application.Workbooks.Add(true);
     56                     excel.Visible = false;//若是true,则在导出的时候会显示EXcel界面。
     57                     if(excel == null)
     58                     {
     59                         MessageBox.Show("EXCEL无法启动!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
     60                         return;
     61                     }
     62                     Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
     63                     Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
     64                     Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
     65                     sheet.Name = "test";
     66                     int m = 0, n = 0;
     67                     //生成Excel中列头名称   
     68                     for(int i = 0; i < dataGridView1.Columns.Count; i++)
     69                     {
     70                         excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;//输出DataGridView列头名
     71                     }
     72                     //把DataGridView当前页的数据保存在Excel中   
     73                     for(int i = 0; i < dataGridView1.Rows.Count - 1; i++)
     74                     {
     75                         for(int j = 0; j < dataGridView1.Columns.Count; j++)
     76                         {
     77                             if(dataGridView1[j, i].ValueType == typeof(string))
     78                             {
     79                                 excel.Cells[i + 2, j + 1] = "'" + dataGridView1[j, i].Value.ToString();
     80                             }
     81                             else
     82                             {
     83                                 excel.Cells[i + 2, j + 1] = dataGridView1[j, i].Value.ToString();
     84                             }
     85                         }
     86                     }
     87                     sheet.SaveAs(strName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
     88                     book.Close(false, miss, miss);
     89                     books.Close();
     90                     excel.Quit();
     91                     System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
     92                     System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
     93                     System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
     94                     System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
     95                     GC.Collect();
     96                     MessageBox.Show("数据已经成功导出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
     97                     // toolStripProgressBar1.Value = 0;
     98                     System.Diagnostics.Process.Start(strName);
     99                 }
    100             }
    101             catch(Exception ex)
    102             {
    103                 MessageBox.Show(ex.Message, "错误提示");
    104             }
    105         }
    106 
    107         public void printAll(System.Data.DataTable dt)
    108         {
    109             //导出到execl
    110             try
    111             {
    112                  SaveFileDialog saveFileDialog = new SaveFileDialog();
    113                 saveFileDialog.Filter = "导出Excel (*.xls)|*.xls";
    114                 saveFileDialog.FilterIndex = 0;
    115                 saveFileDialog.RestoreDirectory = true;
    116                 saveFileDialog.CreatePrompt = true;
    117                 saveFileDialog.Title = "导出文件保存路径";
    118                 saveFileDialog.ShowDialog();
    119                 string strName = saveFileDialog.FileName;
    120                 if(strName.Length != 0)
    121                 {
    122                     //没有数据的话就不往下执行
    123                     if(dt.Rows.Count == 0)
    124                         return;
    125 
    126                     // toolStripProgressBar1.Visible = true;
    127                     System.Reflection.Missing miss = System.Reflection.Missing.Value;
    128                     //实例化一个Excel.Application对象
    129                     Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
    130                     excel.Application.Workbooks.Add(true);
    131                     excel.Visible = false;//若是true,则在导出的时候会显示EXcel界面。
    132                     if(excel == null)
    133                     {
    134                         MessageBox.Show("EXCEL无法启动!", "错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
    135                         return;
    136                     }
    137                     Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
    138                     Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
    139                     Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
    140                     sheet.Name = "test";
    141                     int m = 0, n = 0;
    142 
    143 
    144                     //生成Excel中列头名称
    145                     for(int i = 0; i < dt.Columns.Count; i++)
    146                     {
    147                         excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;//输出DataGridView列头名
    148                     }
    149 
    150                     //把DataGridView当前页的数据保存在Excel中
    151                     if(dt.Rows.Count > 0)
    152                     {
    153                         for(int i = 0; i < dt.Rows.Count; i++)//控制Excel中行,上下的距离,就是可以到Excel最下的行数,比数据长了报错,比数据短了会显示不完
    154                         {
    155                             for(int j = 0; j < dt.Columns.Count; j++)//控制Excel中列,左右的距离,就是可以到Excel最右的列数,比数据长了报错,比数据短了会显示不完
    156                             {
    157                                 string str = dt.Rows[i][j].ToString();
    158                                 excel.Cells[i + 2, j + 1] = "'" + str;//i控制行,从Excel中第2行开始输出第一行数据,j控制列,从Excel中第1列输出第1列数据,"'" +是以string形式保存,所以遇到数字不会转成16进制
    159                             }
    160                         }
    161                     }
    162                     sheet.SaveAs(strName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
    163                     book.Close(false, miss, miss);
    164                     books.Close();
    165                     excel.Quit();
    166                     System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
    167                     System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
    168                     System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
    169                     System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
    170 
    171                     GC.Collect();
    172                     MessageBox.Show("数据已经成功导出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
    173                     // toolStripProgressBar1.Value = 0;
    174                     System.Diagnostics.Process.Start(strName);
    175                 }
    176             }
    177             catch(Exception ex)
    178             {
    179                 MessageBox.Show(ex.Message, "错误提示");
    180             }
    181         }
    182 
    183         private void SqlDB_To_Excel_Load(object sender, EventArgs e)
    184         {
    185             dataGridView1.DataSource = GetDataTableFromSqlServer();
    186         }
    187 
    188         private void button2_Click(object sender, EventArgs e)
    189         {
    190             printAll(GetDataTableFromSqlServer());
    191         }
    192 
    193         private System.Data.DataTable GetDataTableFromSqlServer()
    194         {
    195             string sqlconn = "database=database1;server=localhost;uid=sa;pwd=sa";
    196             SqlConnection cn = new SqlConnection(sqlconn);
    197             string cmdText = "select * from users";
    198             SqlDataAdapter da = new SqlDataAdapter(cmdText, cn);
    199             DataSet ds = new DataSet();
    200             da.Fill(ds, "table1");
    201             return ds.Tables[0];
    202         }
    203 
    204         private System.Data.DataTable GetDataTableFromOracle()
    205         {
    206             string oracleconn = "Data Source=192.168.2.105/Database1;User ID=system;Password=ss;Unicode=True";
    207             OracleConnection cn = new OracleConnection(oracleconn);
    208             string cmdText = "select * from users";
    209             OracleDataAdapter da = new OracleDataAdapter(cmdText, cn);
    210             DataSet ds = new DataSet();
    211             da.Fill(ds, "table1");
    212             return ds.Tables[0];
    213         }
    214     }
    215 }


    结果:1

    代码的思想就是将数据从数据库中读出到DataTable或者DataGridView中,然后遍历他们的每一个单元格的值,给Excel对应的单元格赋值。

    使用DataTable作为遍历的对象,是为了去除分页的困扰。

    看到这里,如果换一个List<T>对象集合,也应该能导出到数据库中了。

    2,Excel数据导入到数据库

    在WinForm中Excel导入到数据库中和在WebForm中的导入过程是一样的。可参见前面的内容。

  • 相关阅读:
    Redis接口限流
    CentOS7以下DNS失效问题
    Vue的安装与使用
    使用 REDIS保存SESSION信息
    ThinkPHP 阿里云图片上传
    Laravel6.0+easywechat4.1获取用户授权例子与分享示例
    1.oracle创建本地数据库步骤及导入数据
    16、React Native实战之TextInput组件
    14.React Native实战之Navigator组件初探
    13.React Native实战之Text组件
  • 原文地址:https://www.cnblogs.com/cpcpc/p/2767934.html
Copyright © 2011-2022 走看看