最近項目要求實現數據庫之間數據在各個數據庫之間導入導出，在此做個筆記

1. 將Oracle中的表導入到Excel中，反之亦然

　　?private static readonly string connectionString = ConfigurationManager.ConnectionStrings["OracleConnection"].ConnectionString;
 1  public void print(DataGridView dataGridView1)
 2         {
 3             //導出到execl   
 4             try
 5             {
 6                 SaveFileDialog saveFileDialog = new SaveFileDialog();
 7                 saveFileDialog.Filter = "導出Excel2003~2007 (*.xls)|*.xls|導出Excel2010~2013 (*.xlsx)|*.xlsx";
 8                 saveFileDialog.FilterIndex = 0;
 9                 saveFileDialog.RestoreDirectory = true;
10                 saveFileDialog.CreatePrompt = true;
11                 saveFileDialog.Title = "導出文件保存路徑";
12                 saveFileDialog.ShowDialog();
13                 string strName = saveFileDialog.FileName;
14                 if (strName.Length != 0)
15                 {
16                     //沒有數據的話就不往下執行   
17                     if (dataGridView1.Rows.Count == 0)
18                         return;
19 
20                     // toolStripProgressBar1.Visible = true;
21                     System.Reflection.Missing miss = System.Reflection.Missing.Value;
22                     //實例化一個Excel.Application對象
23                     Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
24                     excel.Application.Workbooks.Add(true);
25                     excel.Visible = false;//若是true，則在導出的時候會顯示EXcel界面。
26                     if (excel == null)
27                     {
28                         MessageBox.Show("EXCEL無法啟動！", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Error);
29                         return;
30                     }
31                     Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
32                     Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
33                     Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
34                     sheet.Name = "test";
35                     int m = 0, n = 0;
36                     //生成Excel中列頭名稱   
37                     for (int i = 0; i < dataGridView1.Columns.Count; i++)
38                     {
39                         excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;//輸出DataGridView列頭名
40                     }
41                     //把DataGridView當前頁的數據保存在Excel中   
42                     for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
43                     {
44                         for (int j = 0; j < dataGridView1.Columns.Count; j++)
45                         {
46                             if (dataGridView1[j, i].ValueType == typeof(string))
47                             {
48                                 excel.Cells[i + 2, j + 1] = "'" + dataGridView1[j, i].Value.ToString();
49                             }
50                             else
51                             {
52                                 excel.Cells[i + 2, j + 1] = dataGridView1[j, i].Value.ToString();
53                             }
54                         }
55                     }
56                     sheet.SaveAs(strName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
57                     book.Close(false, miss, miss);
58                     books.Close();
59                     excel.Quit();
60                     System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
61                     System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
62                     System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
63                     System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
64                     GC.Collect();
65                     MessageBox.Show("數據已經成功導出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
66                     // toolStripProgressBar1.Value = 0;
67                     System.Diagnostics.Process.Start(strName);
68                 }
69             }
70             catch (Exception ex)
71             {
72                 MessageBox.Show(ex.Message, "錯誤提示");
73             }
74         }

 1    public void printAll(System.Data.DataTable dt)
 2         {
 3             //導出到execl
 4             try
 5             {
 6                 SaveFileDialog saveFileDialog = new SaveFileDialog();
 7                 saveFileDialog.Filter = "導出Excel (*.xls)|*.xls";
 8                 saveFileDialog.FilterIndex = 0;
 9                 saveFileDialog.RestoreDirectory = true;
10                 saveFileDialog.CreatePrompt = true;
11                 saveFileDialog.Title = "導出文件保存路徑";
12                 saveFileDialog.ShowDialog();
13                 string strName = saveFileDialog.FileName;
14                 if (strName.Length != 0)
15                 {
16                     //沒有數據的話就不往下執行
17                     if (dt.Rows.Count == 0)
18                         return;
19 
20                     // toolStripProgressBar1.Visible = true;
21                     System.Reflection.Missing miss = System.Reflection.Missing.Value;
22                     //實例化一個Excel.Application對象
23                     Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
24                     excel.Application.Workbooks.Add(true);
25                     excel.Visible = false;//若是true，則在導出的時候會顯示EXcel界面。
26                     if (excel == null)
27                     {
28                         MessageBox.Show("EXCEL無法啟動！", "錯誤", MessageBoxButtons.OK, MessageBoxIcon.Error);
29                         return;
30                     }
31                     Microsoft.Office.Interop.Excel.Workbooks books = (Microsoft.Office.Interop.Excel.Workbooks)excel.Workbooks;
32                     Microsoft.Office.Interop.Excel.Workbook book = (Microsoft.Office.Interop.Excel.Workbook)(books.Add(miss));
33                     Microsoft.Office.Interop.Excel.Worksheet sheet = (Microsoft.Office.Interop.Excel.Worksheet)book.ActiveSheet;
34                     sheet.Name = "test";
38                     //生成Excel中列頭名稱
39                     for (int i = 0; i < dt.Columns.Count; i++)
40                     {
41                         excel.Cells[1, i + 1] = dataGridView1.Columns[i].HeaderText;//輸出DataGridView列頭名
42                     }
43 
44                     //把DataGridView當前頁的數據保存在Excel中
45                     if (dt.Rows.Count > 0)
46                     {
47                         for (int i = 0; i < dt.Rows.Count; i++)//控制Excel中行，上下的距離，就是可以到Excel最下的行數，比數據長了報錯，比數據短了會顯示不完
48                         {
49                             for (int j = 0; j < dt.Columns.Count; j++)//控制Excel中列，左右的距離，就是可以到Excel最右的列數，比數據長了報錯，比數據短了會顯示不完
50                             {
51                                 string str = dt.Rows[i][j].ToString();
52                                 excel.Cells[i + 2, j + 1] = "'" + str;//i控制行，從Excel中第2行開始輸出第一行數據，j控制列，從Excel中第1列輸出第1列數據，"'" +是以string形式保存，所以遇到數字不會轉成16進制
53                             }
54                         }
55                     }
56                     sheet.SaveAs(strName, miss, miss, miss, miss, miss, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, miss, miss, miss);
57                     book.Close(false, miss, miss);
58                     books.Close();
59                     excel.Quit();
60                     System.Runtime.InteropServices.Marshal.ReleaseComObject(sheet);
61                     System.Runtime.InteropServices.Marshal.ReleaseComObject(book);
62                     System.Runtime.InteropServices.Marshal.ReleaseComObject(books);
63                     System.Runtime.InteropServices.Marshal.ReleaseComObject(excel);
64 
65                     GC.Collect();
66                     MessageBox.Show("數據已經成功導出!", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
67                     // toolStripProgressBar1.Value = 0;
68                     System.Diagnostics.Process.Start(strName);
69                 }
70             }
71             catch (Exception ex)
72             {
73                 MessageBox.Show(ex.Message, "錯誤提示");
74             }
75         }

這兩個方法都可以將Oracle導出到Excel中。轉自http://www.cnblogs.com/cpcpc/archive/2012/11/13/2767934.html

 1 class Excel2Oracle
 2     {
 3         private static readonly string connectionString = ConfigurationManager.ConnectionStrings["OracleConnection"].ConnectionString;
 4         public void InsertData2Oracle(DataSet ds)
 5         {
 6             using (OleDbConnection oraCon = new OleDbConnection(connectionString))
 7             {
 8                 oraCon.Open();
 9                 using (OleDbCommand cmd = new OleDbCommand())
10                 {
11                     cmd.Connection = oraCon;
12                     cmd.CommandType = CommandType.Text;
13 
14                     for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
15                     {
16                         List<string> list_ = new List<string>();
17                         for (int j = 0; j < ds.Tables[0].Columns.Count; j++)
18                         {
19                             list_.Add(ds.Tables[0].Rows[i][j].ToString());
20                         }
21                         string temp = "";
22                         string t = ",";
23 
24                         for (int k = 0; k < list_.Count; k++)
25                         {
26                             if (k == list_.Count - 1) t = "";
27                             temp = temp + "'" + list_[k] + "'" + t + "";
28                             cmd.CommandText = string.Format("Insert into TBUSER values(" + temp + ")");
29                         }
30 
31                         cmd.ExecuteNonQuery();
32                     }
33 
34                 }
35                 oraCon.Close();
36 
37             }
38         }
　　　　}　　

代碼比廢話更要迷人，我就不多說什么了

轉載于:https://www.cnblogs.com/jnzdn/p/5473595.html

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