Question

我在sql server 2008中有一个名为 - "dbo.COM_ConnectionLogRfmDevices"的表。

该表包含7列，其名称如下： -

CL_ID,CL_UnitNumber,CL_RemoteIP,CL_RemotePort,CL_RecDateTime,CL_GPRS,CL_COM.

CL_UnitNumber包含单位数，如下所示： -

352964054838728
352964054868972
352964054839296
352964054868881

我想存储仅列2的内容，即CL_UnitNumber value in string[] array。

连接字符串： -

string _ConnectionString = "Data Source=192.168.1.60;" +
             "Initial Catalog=OLTP_MTEL_DEVICES; User ID=sa; Password=pass,123;";

Answer 1

如果你需要动态调整数组大小，我会改用List ...

List<string> unitNumbers = new List<string>();

using (SqlConnection con = new SqlConnection(_ConnectionString))
{
    con.Open();

    using (SqlCommand command = new SqlCommand("SELECT CL_UnitNumber FROM COM_ConnectionLogRfmDevices", con))
    {
        SqlDataReader reader = command.ExecuteReader();

        while (reader.Read())
        {
            unitNumbers.Add(reader.GetInt32(0)); // Or maybe reader.GetString(0)
        }
    }
}

Answer 2

查看此帖子。将实体框架放入您的应用程序，您可以连接到您的数据库并在几分钟内提取您的数据。非常无痛。

Entity Framework - Get Started

Answer 3

由于您提到了SQL，我想您希望使用原始SQL命令来处理它。像下面这样的东西应该让你开始。

string[] allRecords = null;
string sql = @"SELECT CL_UnitNumber
           FROM some table";
using (var command = new SqlCommand(sql, connection))
{
    con.Open();
    using (var reader = command.ExecuteReader())
    {
        var list = new List<string>();
        while (reader.Read())
            list.Add(reader.GetString(0));
        allRecords = list.ToArray();
    }
}

Answer 4

    var arr = new List<string>();
    var connectionString= "YOUR CONNECTION";
    using (SqlConnection con = new SqlConnection(connectionString))
    {

        con.Open();
        using (SqlCommand command = new SqlCommand("SELECT CL_UnitNumber FROM COM_ConnectionLogRfmDevices", con))
        using (SqlDataReader reader = command.ExecuteReader())
        {
           while (reader.Read())
           {
                arr.Add(reader["CL_UnitNumber"] != DBNull.Value
                                            ? reader["CL_UnitNumber"].ToString()
                                            : "");
           }
        }

    }
    return arr.ToArray();

如何在sql中获取表的所有内容

4 个答案: