使用oledb访问excel文件

操作方法吧excel当成数据库就行了。sheet就是表！然后写sql 语句，create table ..insert into ,update ,select ..whaterver..

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OleDb;
using System.Data;
using System.IO;
namespace Utils
{
    public class OLEDBExcelHelper
    {
        public static void ExcuteNonQuery(string filePath, string sql)
        {
            using(OleDbConnection conn = new OleDbConnection(GetConnectionString(filePath)));
            {
                OleDbCommand cmd = conn.CreateCommand();
                cmd.CommandText = sql;

                conn.Open();
                cmd.ExecuteNonQuery();
                conn.Close();
            }
        }
        public static void BatchExcuteNonQuery(string filePath, IList<string> sqlList)
        {
            using (OleDbConnection conn = new OleDbConnection(GetConnectionString(filePath)))
            {
                OleDbCommand cmd = conn.CreateCommand();
                conn.Open();
                foreach (var sql in sqlList)
                {
                    cmd.CommandText = sql;
                    cmd.ExecuteNonQuery();
                }
            }
        }
        public static string GetConnectionString(string filePath)
        {
            if (filePath.EndsWith(".xls"))
                return string.Format("Provider=Microsoft.Jet.OLEDB.4.0;Data Source={0};"
                    + "Extended Properties='Excel 8.0;HDR=Yes;IMEX=2';", filePath);
            if (filePath.EndsWith(".xlsx"))
                return string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};"
                    + "Extended Properties='Excel 12.0 Xml;HDR=YES';", filePath);
            throw new Exception("wrong file type!");
        }
        public static DataTable ExcuteSelect(string filePath, string sql)
        {
            using(OleDbConnection conn = new OleDbConnection(GetConnectionString(filePath)));
            {
                OleDbDataAdapter ad = new OleDbDataAdapter(sql, conn);
                DataTable table = new DataTable();
                conn.Open();
                ad.Fill(table);
                return table;
            }
        }
    }
}