using System;
using System.Text;
using System.Data;
using System.Data.OleDb;
namespace PowerAgent.DBUtility
{
/**//// <summary>
/// DataToExcel 的摘要说明。
/// DataToExcel 的摘要说明。
/// </summary>
public class DataToExcel
{
const string ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};Extended Properties=Excel 8.0;";
public DataToExcel()
{
}
public string DataTableToExcel(DataTable dt, string excelPath)
{
if (dt == null)
{
return "DataTable不能为空";
}
int rows = dt.Rows.Count;
int cols = dt.Columns.Count;
StringBuilder sb;
string connString;
if (rows == 0)
{
return "没有数据";
}
sb = new StringBuilder();
connString = string.Format(ConnectionString, excelPath);
//生成创建表的脚本
sb.Append("CREATE TABLE ");
sb.Append(dt.TableName + " ( ");
for (int i = 0; i < cols; i++)
{
if (i < cols - 1)
sb.Append(string.Format("{0} varchar,", dt.Columns.ColumnName));
else
sb.Append(string.Format("{0} varchar)", dt.Columns.ColumnName));
}
using (OleDbConnection objConn = new OleDbConnection(connString))
{
OleDbCommand objCmd = new OleDbCommand();
objCmd.Connection = objConn;
objCmd.CommandText = sb.ToString();
try
{
objConn.Open();
objCmd.ExecuteNonQuery();
}
catch (Exception e)
{
return "在Excel中创建表失败，错误信息：" + e.Message;
}
生成插入数据脚本#region 生成插入数据脚本
sb.Remove(0, sb.Length);
sb.Append("INSERT INTO ");
sb.Append(dt.TableName + " ( ");
for (int i = 0; i < cols; i++)
{
if (i < cols - 1)
sb.Append(dt.Columns.ColumnName + ",");
else
sb.Append(dt.Columns.ColumnName + ") values (");
}
for (int i = 0; i < cols; i++)
{
if (i < cols - 1)
sb.Append("@" + dt.Columns.ColumnName + ",");
else
sb.Append("@" + dt.Columns.ColumnName + ")");
}
#endregion
//建立插入动作的Command
objCmd.CommandText = sb.ToString();
OleDbParameterCollection param = objCmd.Parameters;
for (int i = 0; i < cols; i++)
{
param.Add(new OleDbParameter("@" + dt.Columns.ColumnName, OleDbType.VarChar));
}
//遍历DataTable将数据插入新建的Excel文件中
foreach (DataRow row in dt.Rows)
{
for (int i = 0; i < param.Count; i++)
{
param.Value = row;
}
objCmd.ExecuteNonQuery();
}
return "数据已成功导入Excel";
}//end using
}
}//end class
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