C#连接Access数据库,C#连接Excel数据库,C#连接SqlServer数据库,C#连接Mysql数据库总结

大二下学期写的了,如今毕业一个月了,整理整理

额,以前写的好幼稚,只有自己明白了,网上一大堆,大概的意思说下吧

MySQL=========================================

http://dev.mysql.com/downloads/connector/

http://user.qzone.qq.com/652768664/blog/1347859952

连接mysql需要安装mysql,在mysql的C盘安装目录有一个连接 lib,将改lib添加引用用项目OK;

 static void Main(string[] args)
        {
            List lstdb =MySqlConn();
            foreach (string s in lstdb)
            {
                Console.WriteLine(s);
            }
            Console.Read();
        }
        public static List MySqlConn()
        {
            List lstconn = new List();
            MySqlConnection objConn = new MySqlConnection();
            objConn.ConnectionString = "server=127.0.0.1;User Id=root;Password=000000;Persist Security Info=True;database=test ";
            objConn.Open();
            MySqlCommand objCmd = new MySqlCommand("select * from maya", objConn);
            MySqlDataReader dr = objCmd.ExecuteReader();
            while (dr.Read())
            {
                lstconn.Add(dr[0].ToString());
            }
            objConn.Close();
            return lstconn;
        }
    }

Access==========================================

http://user.qzone.qq.com/652768664/blog/1334636397

access2007 和 access 2003的连接字符串不同,一个ADO版本12.0,一个是4.0;

1,

 public  List Access2007(string accdbpath,string tablename)
        {
            List lstdata = new List();
            string strconn = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source='" + accdbpath + "'";
            OleDbConnection conn = new OleDbConnection(strconn);
            conn.Open();
            string cmdtext = "select * from " + tablename+"";
            OleDbDataAdapter apdate = new OleDbDataAdapter(cmdtext, conn);
            DataTable table = new DataTable();
            apdate.Fill(table);
            if (table.Rows.Count > 0)
            {
                for (int irow = 0; irow < table.Rows.Count; irow++)
                    for (int icol = 0; icol < table.Columns.Count; icol++)
                        lstdata.Add("Row:" + irow
                            + " Column:" + icol
                            + " ColumnName:" + table.Columns[icol].ColumnName
                            + " Value:" + table.Rows[irow][table.Columns[icol].ColumnName]);
            }
            return lstdata;
        }

2,

namespace 留言板_access数据库_
{
    public partial class _Default : System.Web.UI.Page
    {
        string strConnection = "Provider=Microsoft.Jet.OleDb.4.0; Data Source=F:\\留言板.mdb ";
        string sex;
        protected void Page_Load(object sender, EventArgs e)
        {
            OleDbConnection coon = new OleDbConnection(strConnection);
            coon.Open();
            Response.Write("Access数据库连接状态显示:" + coon.State);
            coon.Close();
            Label1.Text=DateTime.Now.ToString();
            if (RadioButton1.Checked) { sex = "男"; }
            else { sex = "女"; }
        }
        protected void Button1_Click(object sender, EventArgs e)
        {
            TextBox2.Text = "";
        }
        public void Seek(string str)
        {
            using (OleDbConnection coon = new OleDbConnection(strConnection))
            {
                OleDbCommand cmd = new OleDbCommand(str, coon);
                try
                {
                    coon.Open();
                    OleDbDataReader r = cmd.ExecuteReader();
                    while (r.Read())
                    TextBox3.Text = string.Format("留言人:{0};性别:{1};留言内容:{2};留言时间{3}", r[0], r[1], r[2],r[4]);
                }
                catch (Exception ee)
                {
                    Response.Write(ee.Message);
                }
            }
 
        }
        public void Insert(string str)
        {
            using (OleDbConnection coon = new OleDbConnection(strConnection))
            {
                OleDbCommand cmd = new OleDbCommand(str, coon);
                try
                {
                    coon.Open();
                    cmd.ExecuteNonQuery();
                    Response.Write("");
                    
                }
                catch (Exception ee)
                {
                    Response.Write(ee.Message);
                }
            }
 
        }
        protected void Button2_Click(object sender, EventArgs e)
        {
            Seek("select * from 留言板 where 姓名= '" + TextBox1.Text.Trim() + "'");
        }
        protected void Button3_Click(object sender, EventArgs e)
        {
            Insert("insert into 留言板(姓名,性别,留言内容,留言时间) values('"+TextBox1.Text.Trim()+"','"+sex.Trim()+"','"+TextBox2.Text.Trim()+"','"+Label1.Text+"')");
            Button2_Click(sender,e);
        }
    }
}

Excel==========================================

http://user.qzone.qq.com/652768664/blog/1350139919

class ExcelInAndOut
    {
        /// 读取Excel文档
        ///
        /// 文件名称
        /// 返回一个数据集
        public DataSet ExcelToDS(string Path)
        {
            string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + Path + ";" + "Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            string strExcel = "";
            OleDbDataAdapter myCommand = null;
            DataSet ds = null;
            strExcel = "select * from [sheet1$]";
            myCommand = new OleDbDataAdapter(strExcel, strConn);
            ds = new DataSet();
            myCommand.Fill(ds, "table1");
            return ds;
        }
    }

SqlServer and SqlLite==========================================

一个服务器名为 . 一个服务器名为 .\sqlexpress