以OleDb方式操作Excel文件

Excel可作为一种数据共享的方式交给办公人员，比access要简单方便

Excel可作为OleDb的对象进行操作，这里以03版的Excel为例：

首先要引入以下函数库，并定义必要的对象：

using System.Data;
using System.Data.OleDb;
using System.IO;

　　OleDbConnection objConnection;
　　OleDbCommand objCommand;
　　OleDbDataAdapter objDataAdapter;

　　public DataSet objDataSet=new DataSet();

1、创建xls文档

 　　　　//生成03版的xls，filepath为文档的路径，sqlCreateTable为创建表的sql语句
        public void CreateAXls(string filePath,string sqlCreateTable)
        {
            try
            {

　　　　　　　　　if (!File.Exists(filePath))

　　　　　　　　　{
                objConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source="
                        + filePath + "; Extended Properties=Excel 8.0;");
                string strSql = sqlCreateTable;
                objCommand = new OleDbCommand(strSql, objConnection);
                objConnection.Open();
                objCommand.ExecuteNonQuery();
                
                objConnection.Close();

　　　　　　　　　}
            }
            catch
            { }
            
        }

2、读取工作薄

public void ReadSheet(string path,string tableName)
        {
            try
            {
                if ((path.Substring(path.Length - 4, 4) == "xlsx") || (path.Substring(path.Length - 4, 4) == "XLSX"))
                {
                    objConnection = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0; Data Source="
                        + path + "; Extended Properties='Excel 12.0;HDR=YES;IMEX=1'");
                }
                else
                {
                    objConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source="
                        + path + "; Extended Properties='Excel 8.0;HDR=YES;IMEX=1'");
                }
                objConnection.Open();

                objDataAdapter = new OleDbDataAdapter("select * from [sheet1$]", objConnection);
                objDataAdapter.Fill(objDataSet, tableName);

                objConnection.Close();
            }
            catch
            { }
        }

3、插入数据

public void InsertData(string filePath, string sqlInsertData)
        {
            try
            {
                objConnection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0; Data Source="
                        + filePath + "; Extended Properties=Excel 8.0;");
                string strSql = sqlInsertData;
                objCommand = new OleDbCommand(strSql, objConnection);
                objCommand.CommandText = strSql;
                objCommand.CommandType = CommandType.Text;
                objConnection.Open();
                objCommand.ExecuteNonQuery();
                
                objConnection.Close();
            }
            catch
            { }
        }

插入数据时，最好将所需插入的sql语句串成一个大字串，打开链接一次写入，这样不仅速度快，同时能减少IO错误