从C＃连接到MS Access

Question

I found this code online, which connects from C# to an SQL server database.

I wish to do something similar, but I want to connect to an Access 2010 database.

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
namespace WindowsFormsApplication1.DAL
{
    public class PersonDAL
    {
        public string ConString = 
            "Data Source=SOURAV-PC\\SQL_INSTANCE;Initial Catalog=test;Integrated Security=True";
        SqlConnection con = new SqlConnection();
        DataTable dt = new DataTable();
        public DataTable Read()
        {
            con.ConnectionString = ConString;
            if (ConnectionState.Closed == con.State)
                con.Open();
            SqlCommand cmd = new SqlCommand("select * from Person",con);
            try
            {
                SqlDataReader rd = cmd.ExecuteReader();
                dt.Load(rd);
                return dt;
            }
            catch
            {
                throw;
            }
        }
        public DataTable Read(Int16 Id)
        {
            con.ConnectionString = ConString;
            if (ConnectionState.Closed == con.State)
                con.Open();
            SqlCommand cmd = new SqlCommand("select * from Person where ID= "+ Id +"", con);
            try
            {
                SqlDataReader rd = cmd.ExecuteReader();
                dt.Load(rd);
                return dt;
            }
            catch
            {
                throw;
            }
        }
    }
}

How should I change my code to do that ? For the example, let's assume that my access DB is in: C:\\VisualStudioProject\\Sample

Thank you!

Answer 1

You need to do the following:

1. Use Connection string as:

   string connectionstring = Standard security Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\\myFolder\\myAccessFile.accdb; Persist Security Info=False;

2. Use OLEDB instead of SQL

   OleDbConnection MyConn = new OleDbConnection(connectionstring);

Answer 2

public class PersonDAL
    {
        public string ConString =
           @"Standard security Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\myFolder\myAccessFile.accdb; Persist Security Info=False;";
        OleDbConnection con;
        DataTable dt;
        public PersonDAL()
        {
            con = new OleDbConnection();
            dt = new DataTable();
        }

        public DataTable Read()
        {
            con.ConnectionString = ConString;
            if (ConnectionState.Closed == con.State)
                con.Open();
            OleDbCommand cmd = new OleDbCommand("select * from Person", con);
            try
            {
                OleDbDataReader rd = cmd.ExecuteReader();
                dt.Load(rd);
                return dt;
            }
            catch
            {
                throw;
            }
        }
        public DataTable Read(Int16 Id)
        {
            con.ConnectionString = ConString;
            if (ConnectionState.Closed == con.State)
                con.Open();
            OleDbCommand cmd = new OleDbCommand("select * from Person where ID= " + Id + "", con);
            try
            {
                OleDbDataReader rd = cmd.ExecuteReader();
                dt.Load(rd);
                return dt;
            }
            catch
            {
                throw;
            }
        }
    }