Question

您好我已经在其中创建了一个Visual Basic项目我从数据库中读取（该表名为Customers）但是当我输出变量时我将它保存到它中就会出现system.data.sqlclient.sqldatareader而不是值该专栏。这是Vb;

        Dim command As New SqlCommand("SELECT user FROM Customers", connection)
    Dim reader As SqlDataReader = command.ExecuteReader()
    Dim output As String = Convert.ToString(reader)
    MsgBox(output)

SQL是;

CREATE TABLE [dbo].[Customers] ( [Id] INT NOT NULL , [user] INT NOT NULL DEFAULT 34313431, [password] INT NOT NULL DEFAULT 343134, CONSTRAINT [PK_Table] PRIMARY KEY ([Id]) )

Answer 1

Dim command As New SqlCommand("SELECT [user] FROM Customers", connection)是SQL Server（和其他数据库）中的保留字。这可能是您遇到问题的原因。

尝试：

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参数异常未处理的Visual Basic和SQL

1 个答案: