C#-SqlDataReader不会返回所有行

我的SQL命令返回3行,这些行已在SQL Server GUI中验证.我运行完全相同的代码,而SqlDataReader只返回其中的2个.相同的sql命令使用SqlDataAdapter返回3行.

这是我的代码-ds有3行.为了显示差异,我添加了SqlDataAdapter.

提前致谢.

using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["VPO"].ConnectionString))
{
    string sql = "SELECT DISTINCT A.account_id, A.fname, A.lname, 
                  FROM T_Test1 A WITH (NOLOCK) 
                  JOIN T_Test2 AF WITH (NOLOCK) ON A.Account_id=AF.Account_id
                  WHERE account_status = 'A' AND A.card IS NOT NULL
                    AND A.dateFrom >= '09-02-2013 00:00:00' 
                    AND A.dateFrom <= '09-30-2013 00:00:00' 
                    AND AF.code = 'INE'";

    SqlCommand command = new SqlCommand(sql.ToString(), connection);
    command.CommandTimeout = 3600;

    connection.Open();

    using (SqlDataReader reader = command.ExecuteReader())
    { 
        while (reader.Read())
        {}
    }

    DataSet ds = new DataSet();

    SqlDataAdapter da = new SqlDataAdapter(command.CommandText, connection);
    da.Fill(ds);
}

我找到了解决方案：
using部分的其中一行正在读取第一条记录.在while循环中,它正在从第二条记录中读取.我删除了以下if条件,并且效果很好.谢谢大家的回复.很抱歉没有发布该行,因为我认为该行仅处理异常.

if (!reader.Read()) 
    throw new ApplicationException("MISSING Transaction Returned By Financial Institution. Transaction was not found in the database."); 
while (reader.Read()) {}

解决方法:

您可以创建一个类.

public class AccountDetails
{
    public int AccountId {get; set;}  
    public string FName {get; set;}     
    public string LName {get; set;} 
}

然后像这样返回AccontDetails列表…

public List<AccountDetails> GetAccountDetails()
{
    using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["VPO"].ConnectionString))
    {
        string sql = "SELECT DISTINCT A.account_id, A.fname, A.lname, 
                      FROM T_Test1 A WITH (NOLOCK) 
                      JOIN T_Test2 AF WITH (NOLOCK) ON A.Account_id=AF.Account_id
                      WHERE account_status = 'A' AND A.card IS NOT NULL
                        AND A.dateFrom >= '09-02-2013 00:00:00' 
                        AND A.dateFrom <= '09-30-2013 00:00:00' 
                        AND AF.code = 'INE'";

        SqlCommand command = new SqlCommand(sql.ToString(), connection);
        command.CommandTimeout = 3600;

        connection.Open();
        var accDetails = new List<AccountDetails>();

        using (var rdr = command.ExecuteReader())
            {
                    while (rdr.Read())
                    {
                        var accountDetails = new AccountDetails{
                            AccountId = rdr.GetInt32(0),
                            FName = rdr.GetString(1),
                            LName = rdr.GetString(2)
                        };
                        accDetails.Add(accountDetails);
                    }                   
            }
    }

    return accDetails;
}

语法可能像我写一些这样的徒手画出的那样.

除非您特别需要使用数据集,否则这比使用数据集轻.如果是这样,请告诉我,我将更新代码.

标签：c-4-0,ado-net,c,sql-server
来源： https://codeday.me/bug/20191122/2062790.html