C#连接Access数据库

一、使用相对路径

public static string Path = Application.StartupPath.Substring(0, Application .StartupPath.Substring(0, Application.StartupPath.LastIndexOf("\\" )).LastIndexOf("\\"));

public static string M_str_sqlcon = "Provider = Microsoft.jet.OLEDB.4.0;Data Source=" +  Path + @"\db\db_MS.mdb" ;
地址为项目主目录的地址

My_con = new OleDbConnection(M_str_sqlcon);   //用SqlConnection对象与指定的数据库相连接

二、使用绝对路径

public static string M_str_sqlcon = "Provider = Microsoft.jet.OLEDB.4.0;Data Source=E:\\db_MS.mdb";

My_con = new OleDbConnection(M_str_sqlcon);   //用SqlConnection对象与指定的数据库相连接

三、链接access完整代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Common;
using System.Drawing;
using System.Linq;
using System.Data.OleDb;
using System.Text;
using System.Windows.Forms;
 
namespace Location
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            this.Text = "Location System";
            button1.Text = "连接数据库";
            button2.Text = "查询";
            button3.Text = "退出";
            button4.Text = "添加";
            button5.Text = "删除";
            button6.Text = "修改";
            label1.Text = "ID：";
            textBox1.Text = "0";
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;data source=Location.mdb";//创建OleDbConnection对象
            OleDbConnection con = new OleDbConnection(ConStr);
            con.Open();
            if (con.State == ConnectionState.Open)
            {
                MessageBox.Show("Access数据库的连接成功!", "Access数据库的连接");
            }
            else
            {
                MessageBox.Show("Access数据库的连接失败!", "Access数据库的连接");
            }
            con.Close();
           
        }
 
        private void button3_Click(object sender, EventArgs e)              //退出
        {
            this.Close();
        }
 
        private void button2_Click(object sender, EventArgs e)              //查询模块
        {
            string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;data source=Location.mdb";//创建OleDbConnection对象
            OleDbConnection con = new OleDbConnection(ConStr);
            con.Open();
            int i = Convert.ToInt16(textBox1 .Text);
            OleDbCommand cmd = new OleDbCommand("Select * From data where ID>=@id", con);
            cmd.Parameters.Add("@id",i);
            OleDbDataReader reader = cmd.ExecuteReader();
            reader.Read();
            
            //textBox1.Text = reader[0].ToString();
            textBox2.Text = reader[1].ToString();
            textBox3.Text = reader[2].ToString();
            textBox4.Text = reader[3].ToString();
            textBox5.Text = reader[4].ToString();
            textBox6.Text = reader[5].ToString();
            textBox7.Text = reader[6].ToString();
 
            reader.Close();
            con.Close();
        }
 
        private void button4_Click(object sender, EventArgs e)              //添加
        {
            string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;data source=Location.mdb";//创建OleDbConnection对象
            OleDbConnection con = new OleDbConnection(ConStr);
            con.Open();
 
            for (int i = 0; i < 1000; i++)
            {
                string sql = "insert into data(ID)values(" + i + ")";
                OleDbCommand cmd = new OleDbCommand(sql, con);
                cmd.ExecuteNonQuery();
            }
                       
            con.Close();
        }
 
        private void button5_Click(object sender, EventArgs e)               //删除
        {
            string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;data source=Location.mdb";//创建OleDbConnection对象
            OleDbConnection con = new OleDbConnection(ConStr);
            con.Open();
            OleDbCommand cmd = new OleDbCommand("delete from data", con);
            cmd.ExecuteNonQuery();
        }
 
        private void button6_Click(object sender, EventArgs e)              //修改
        {
            string ConStr = "Provider=Microsoft.Jet.OLEDB.4.0;data source=Location.mdb";//创建OleDbConnection对象
            OleDbConnection con = new OleDbConnection(ConStr);
            con.Open();
            string sql = "update data set longitude=12 where ID=1";
            OleDbCommand cmd = new OleDbCommand(sql, con);
            cmd.ExecuteNonQuery();
        }
    }
}