如何将数据库内容导出成excel表格

有时候需要将数据库的数据导出至Excel表格表格，以便进行查看和分析，那么如何导出呢？下面用代码来实现。
    首先，新建一个工程，需要添加引用Microsoft.Office.Interop.Excel.dll，以Oracle数据库为例（只要读出DataTable或DataSet就行了，哪种数据库没关系）。

1、创建一个表格，并插入如下数据。

drop table TABLETESTEXCEL; 
create table TABLETESTEXCEL 
( 
  col_id   NUMBER not null, 
  col_name VARCHAR2(32), 
  col_age  NUMBER, 
  col_sex  VARCHAR2(4), 
  col_work VARCHAR2(32), 
  col_mony FLOAT 
); 
数据：

insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (1, '吴一', 25, '男', '.NET', 5000); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (2, '孙二', 24, '男', 'JAVA', 4999); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (3, '张三', 25, '男', 'PHP', 5001); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (4, '李四', 26, '男', 'DELPHI', 5002); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (5, '王五', 27, '男', 'C++', 5003); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (6, '赵六', 25, '男', 'C', 4008); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (7, '燕七', 25, '男', '数据库', 4007); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (8, '胡八', 25, '男', 'JSP', 5005); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (9, '钱九', 25, '男', 'ASP.NET', 4005); 
 
insert into TABLETESTEXCEL (col_id, col_name, col_age, col_sex, col_work, col_mony) 
values (10, '沈十', 25, '男', 'VB', 4000); 
commit; 
2、C#代码实现

数据库操作的类：

public class DataBaseHelper 
 { 
    public static DataTable ExecuterQuery(string connectionString, string commandSql) 
    { 
        DataTable dataTable = new DataTable(); 
 
        try 
        { 
          using (OracleConnection oracleConnection =  
          new OracleConnection(connectionString)) 
          { 
            oracleConnection.Open(); 
 
            using (OracleDataAdapter oracleDataAdapter =  
            new OracleDataAdapter(commandSql,oracleConnection)) 
                { 
                   oracleDataAdapter.Fill(dataTable); 
                } 
 
                oracleConnection.Close(); 
          } 
        } 
        catch 
        { 
          return null; 
        } 
 
     return dataTable; 
    } 
 } 

public class DataBaseDao 
{ 
   public static DataTable GetDataBaseTable() 
   { 
      string sql = " SELECT * FROM tableTestExcel"; 
 
      return DataBaseHelper.ExecuterQuery("User ID=downsoft;Password=sys;Data Source=orcl", sql); 
   } 
} 
 导出Excel的类：

public class DataChangeExcel 
{ 
        ///

 
        /// 数据库转为excel表格 
         ///

 
       /// 数据库数据 
       /// 导出的excel文件 
        public static void DataSetToExcel(DataTable dataTable, string SaveFile) 
        { 
            Excel.Application excel; 
 
            Excel._Workbook workBook; 
 
            Excel._Worksheet workSheet; 
 
            object misValue = System.Reflection.Missing.Value; 
 
            excel = new Excel.ApplicationClass(); 
 
            workBook = excel.Workbooks.Add(misValue); 
 
            workSheet = (Excel._Worksheet)workBook.ActiveSheet; 
 
            int rowIndex = 1; 
 
            int colIndex = 0; 
 
            //取得标题 
            foreach (DataColumn col in dataTable.Columns) 
            { 
                colIndex++; 
 
                excel.Cells[1, colIndex] = col.ColumnName; 
            } 
 
            //取得表格中的数据 
            foreach (DataRow row in dataTable.Rows) 
            { 
                rowIndex++; 
 
                colIndex = 0; 
 
                foreach (DataColumn col in dataTable.Columns) 
                { 
                   colIndex++; 
 
                   excel.Cells[rowIndex, colIndex] =  
                         
                        row[col.ColumnName].ToString().Trim(); 
 
                    //设置表格内容居中对齐 
                      workSheet.get_Range(excel.Cells[rowIndex, colIndex],  
                         
                        excel.Cells[rowIndex, colIndex]).HorizontalAlignment =  
                         
                        Excel.XlVAlign.xlVAlignCenter; 
                } 
            } 
 
            excel.Visible = false; 
 
            workBook.SaveAs(SaveFile, Excel.XlFileFormat.xlWorkbookNormal, misValue,  
 
                misValue, misValue, misValue, Excel.XlSaveAsAccessMode.xlExclusive,  
                 
                misValue, misValue, misValue, misValue, misValue); 
 
            dataTable = null; 
 
            workBook.Close(true, misValue, misValue); 
 
            excel.Quit(); 
 
            PublicMethod.Kill(excel);//调用kill当前excel进程 
 
            releaseObject(workSheet); 
 
            releaseObject(workBook); 
 
            releaseObject(excel); 
 
        } 
 
        private static void releaseObject(object obj) 
        { 
            try 
            { 
                System.Runtime.InteropServices.Marshal.ReleaseComObject(obj); 
                obj = null; 
            } 
            catch 
            { 
                obj = null; 
            } 
            finally 
            { 
                GC.Collect(); 
            } 
        } 
 } 
关闭进程的类:

public class PublicMethod 
{ 
   [DllImport("User32.dll", CharSet = CharSet.Auto)] 
 
   public static extern int GetWindowThreadProcessId(IntPtr hwnd, out int ID); 
 
   public static void Kill(Microsoft.Office.Interop.Excel.Application excel) 
   { 
       try 
       { 
         IntPtr t = new IntPtr(excel.Hwnd); 
 
         int k = 0; 
 
         GetWindowThreadProcessId(t, out k); 
 
         System.Diagnostics.Process p = System.Diagnostics.Process.GetProcessById(k); 
                
         p.Kill();  
        } 
        catch 
        { } 
   } 
} 
写好了如上的类，那么开始调用吧，调用：

DataChangeExcel.DataSetToExcel(DataBaseDao.GetDataBaseTable(),  
@"F:\outputFormDataBase.xls"); 
这样成功将数据导出，如图。