使用VB .net从Sqlserver db中检索记录

Question

这是我正在使用的:

Dim connstr = "data source=mydatasource;initial catalog=gcs_dw;persist security   info=True;user id=myuser;password=mypassword;Asynchronous Processing=True"
Dim sqlquery = "SELECT * FROM Customer WHERE CITY = 'Anytown'"
Dim connection As SqlConnection = New SqlConnection(connstr)
connection.Open()

Dim command As SqlCommand = connection.CreateCommand()
command.CommandText = sqlquery
Dim reader As SqlDataReader = command.ExecuteReader()
reader.Read()
Console.WriteLine(reader.ToString)
connection.Close()
Console.Read()

正如您所看到的,我正在尝试将查询结果显示到命令行,目前显示的只是"System.Data.SqlClient.SqlDataReader".我的SQL查询的结果在哪里,为什么我无法检索它们？

Answer 1

这就是问题:

Console.WriteLine(reader.ToString)

您ToString直接在阅读器上调用,而不是从当前行询问它是否具有特定值.就像是:

Console.WriteLine(reader.GetString(0))

应该没事.