How do I connect to a database and loop over a recordset in C#?(如何连接到数据库并在 C# 中循环记录集?)

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问题描述

在 C# 中连接和查询数据库以获取一组记录的最简单方法是什么?

What's the simplest way to connect and query a database for a set of records in C#?

推荐答案

@Goyuix -- 这对于从记忆中编写的东西来说非常棒.在这里测试它 - 发现连接没有打开.否则非常好.

@Goyuix -- that's excellent for something written from memory. tested it here -- found the connection wasn't opened. Otherwise very nice.

using System.Data.OleDb;
...

using (OleDbConnection conn = new OleDbConnection())
{
    conn.ConnectionString = "Provider=sqloledb;Data Source=yourServername\yourInstance;Initial Catalog=databaseName;Integrated Security=SSPI;";

    using (OleDbCommand cmd = new OleDbCommand())
    {
        conn.Open();
        cmd.Connection = conn;
        cmd.CommandText = "Select * from yourTable";

        using (OleDbDataReader dr = cmd.ExecuteReader())
        {
            while (dr.Read())
            {
                Console.WriteLine(dr["columnName"]);
            }
        }
    }
}

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