Using Access databases in C#?

Question

How would I use a Microsoft Access ( .accdb ) database in C# (console application, not web asp.net)? From what I've read, I'll need to use ADO.NET , but I'm really at a loss as to how to do this in a C# console application. In PHP with MySQL , I'd be looking for mysqli_construct Could anyone point me towards a tutorial or documentation that would help me with that? I'm trying to use it as a way to store and access data for my non-web, non ASP.NET application, if that changes anything.

Thanks!

Answer 1

See this walkthrough for using ADO.NET to edit an Access database .

Now while that example is using a web application, don't worry, the classes being used are still applicable for a console application as well.

The main classes you will need to use are:

• OleDbConnection
• OleDbCommand
• OleDbDataReader

The documentation of the classes above all have code samples that are console app examples.

Below is a code snippet for use in a console app (remember to add the: using System.Data.OleDb;

string connectionString = 
    @"Provider=Microsoft.Jet.OLEDB.4.0;" +
    @"Data Source=C:\path\to\your\database.mdb;" +
    @"User Id=;Password=;";

string queryString = "SELECT Foo FROM Bar";

using (OleDbConnection connection = new OleDbConnection(connectionString))
using (OleDbCommand command = new OleDbCommand(queryString, connection))
{
    try
    {
        connection.Open();
        OleDbDataReader reader = command.ExecuteReader();

        while (reader.Read())
        {
            Console.WriteLine(reader[0].ToString());
        }
        reader.Close();
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
}

Also, just noticed you explicitly said an .accdb database. For this grab the Microsoft Access Database Engine 2010 Redistributable . The provider in the connection string would then need to be changed to: Microsoft.ACE.OLEDB.12.0 (see notes at that link for more info).

Answer 2

Just use System.OleDb . Here is a small class that I use

First of all, place the database fle inside App_Data

web.config

<connectionStrings>
    <add name="MyConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|\DatabaseName.accdb" providerName="System.Data.OleDb"/>
</connectionStrings>

App_Code/DataAccess.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.Data.OleDb;

public class DataAccess
{


    #region "Public Methods"

    public static DataTable GetTableFromQuery(string query, Dictionary<string, object> parameters, CommandType commandType)
    {
        DataTable dataTable = new DataTable();
        using (OleDbConnection conn = GetConnection()) {
            using (OleDbCommand cmd = new OleDbCommand(query, conn)) {
                cmd.CommandType = commandType;
                if (parameters != null) {
                    foreach (KeyValuePair<string, object> parameter in parameters) {
                        cmd.Parameters.AddWithValue(parameter.Key, parameter.Value);
                    }
                }
                using (OleDbDataAdapter adapter = new OleDbDataAdapter(cmd)) {
                    adapter.Fill(dataTable);
                }
            }
        }
        return dataTable;
    }

    public static object GetSingleObjectFromQuery(string query, Dictionary<string, object> parameters, CommandType commandType)
    {
        object value = null;
        using (OleDbConnection conn = GetConnection()) {
            using (OleDbCommand cmd = new OleDbCommand(query, conn)) {
                cmd.CommandType = commandType;
                if (parameters != null) {
                    foreach (KeyValuePair<string, object> parameter in parameters) {
                        cmd.Parameters.AddWithValue(parameter.Key, parameter.Value);
                    }
                }
                conn.Open();
                using (OleDbDataReader reader = cmd.ExecuteReader()) {
                    while (reader.Read()) {
                        value = reader.GetValue(0);
                    }
                }
            }
        }
        return value;
    }

    public static int ExecuteNonQuery(string query, Dictionary<string, object> parameters, CommandType commandType)
    {
        int value = 1;
        using (OleDbConnection conn = GetConnection()) {
            using (OleDbCommand cmd = new OleDbCommand(query, conn)) {
                cmd.CommandType = commandType;
                if (parameters != null) {
                    foreach (KeyValuePair<string, object> parameter in parameters) {
                        cmd.Parameters.AddWithValue(parameter.Key, parameter.Value);
                    }
                }
                cmd.Connection.Open();
                value = cmd.ExecuteNonQuery();
            }
        }
        return value;
    }

    #endregion

    #region "Private Methods"

    private static OleDbConnection GetConnection()
    {
        string ConnectionString = System.Configuration.ConfigurationManager.ConnectionStrings("MyConnectionString").ConnectionString;
        return new OleDbConnection(ConnectionString);
    }

    #endregion

}

---

Now call it from page like

 var myTable = DataAccess.GetTableFromQuery("SELECT * FROM TableName", null, CommandType.Text); 

Answer 3

看一下OLEDB命名空间 ， 这里和这里有一些简单的例子。