尝试连接到 Access 数据库 table 以检索数据，但遇到困难

Question

第一次做数据库编程，所以我只是在Access中做了一个数据库来尝试用它做点什么。我在桌面上创建的数据库名为 "TestDatabase"，而我在该数据库中创建的 table 名为 "TestTable"。这是我的代码：

using System;
using System.Data;
using System.Data.SqlClient;

namespace DatabaseTest
{
    class Test
    {
        static void Main(string[] args)
        {
            // I don't know if my connection is correct or not. My access database is on my local desktop though
            string connectionString = "Data Source = (local); Initial Catalog = TestDatabase; Integrated Security = SSPI";
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlDataReader reader = null;
                SqlCommand command = new SqlCommand("SELECT * from TestTable", connection);

                connection.Open();
                try
                {
                    reader = command.ExecuteReader();
                }
                catch (InvalidOperationException e)
                {
                    Console.WriteLine(e.ToString());
                }

                // print all the data in the table
                while (reader.Read())
                {
                    Console.Write(reader[0].ToString() + ", ");
                    Console.Write(reader[1].ToString() + ", ");
                    Console.Write(reader[2].ToString() + ", ");
                    Console.Write(reader[3].ToString() + ", ");
                    Console.WriteLine(reader[4].ToString());
                }
            }
            Console.ReadLine();
        }
    }
}

这是我的 table 样子，如果您想知道：（只是一个玩具示例）

ID   First Name  Last Name   Age     Friend
1    Leon        Ma          18      Yes
2    Amy         Jane        16      No
3    David       Zhang       20      No
4    Alan        Yue         19      Yes

但是，它不起作用，因为我的控制台上没有显示任何内容。我做错了什么。真的需要一些帮助。谢谢

Answer 1

您需要类似以下内容才能连接到 Access DB

conn = new System.Data.OleDb.OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=C:\DbPath\SomeAccessFileName.accdb")

对于标准安全性，配置文件将像这样设置

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

参考LinkAccess connection strings

在代码隐藏中创建连接对象的用法

using System.Data.Odbc;

using(OleDbConnection connection = new OleDbConnection(con))
{
    connection.Open();
    OleDbCommand command = new OleDbCommand("SELECT * from TestTable", connection) 
    using(OleDbDataReader reader = command.ExecuteReader())
    {
         while(reader.Read())
         {
            Console.Write(reader[0].ToString() + ", ");
            Console.Write(reader[1].ToString() + ", ");
            Console.Write(reader[2].ToString() + ", ");
            Console.Write(reader[3].ToString() + ", ");
            Console.WriteLine(reader[4].ToString());
         }
    }
}

尝试连接到 Access 数据库 table 以检索数据，但遇到困难

Trying to connect to a Access database table in order to retrieve data, but encounter difficulties

c#

sql

database

database-programming