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.NextResult() method does gives an error that states that no data is present

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问题 Can you check my coding and let me know what I'm doing wrong? I'm trying to use the .NextResult() method of a DataReader but I get an error that no data is present. The 1st query returns a value but the 2nd query is the problem. Dim strSqlStatement As String = "Select Count(*) As TotalRows " & _ "From Parents " & _ "Where (FatherName = @SearchValue " & _ " Or MotherName = @SearchValue);" strSqlStatement = strSqlStatement & "Select FatherName, MotherName " & _ "From Parents " & _ "Where

.NextResult() method does gives an error that states that no data is present

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Covariance Matrix Python - Omit -9999 Value

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问题 I'm trying to calculate the co-variance matrix of two completely overlapping images using python. The code for the same is: stacked = np.vstack((image1.ravel(),image2.ravel())) np.cov(stacked) The issue with using this method is that sometimes the images may contain a NoData value like -9999 signifying that the pixel value isn't present. In such a case the np.cov still considers the value causing the mean of the images to drastically vary giving the wrong covariance output. If I try to remove

Invalid attempt to read when no data is present in dr

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问题 I am trying to create a login form on my ASP.NET website. Currently, there's some problem. I am trying to incorporate the functionality such that the logged in user has the previlige to view only his profile. The code on the login page is this: business.clsprofiles obj = new business.clsprofiles(); Int32 a = obj.logincheck(TextBox3.Text, TextBox4.Text); if (a == -1) { Label1.Text = "Username/Password incorrect"; } else { Session["cod"]= a; Response.Redirect("profile.aspx"); } After logging in

Java WebSocket server OutputStream not flushing

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问题 I have read a similar question, but my problem wasn't solved. I am trying, for the sake of learning, to build my own Java WebSocket server. The server is set up fine, it accepts incoming connections and gets the handshake data from the client. My server then calculates the handshake return data and tries to write it and flush it. Nonetheless, the in the web inspector, no response headers are shown for the client and the onopen -JavaScript event is never fired. String EOL = System.getProperty(

Invalid attempt to read when no data is present in dr

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I am trying to create a login form on my ASP.NET website. Currently, there's some problem. I am trying to incorporate the functionality such that the logged in user has the previlige to view only his profile. The code on the login page is this: business.clsprofiles obj = new business.clsprofiles(); Int32 a = obj.logincheck(TextBox3.Text, TextBox4.Text); if (a == -1) { Label1.Text = "Username/Password incorrect"; } else { Session["cod"]= a; Response.Redirect("profile.aspx"); } After logging in, the user is moved to the page where the person can view his profile once logged in. Session is

How to show an empty view with a RecyclerView?

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问题 I am used to put an special view inside the layout file as described in the ListActivity documentation to be displayed when there is no data . This view has the id \"android:id/empty\" . <TextView android:id=\"@android:id/empty\" android:layout_width=\"wrap_content\" android:layout_height=\"wrap_content\" android:text=\"@string/no_data\" /> I wonder how this can be done with the new RecyclerView? 回答1: On the same layout where is defined the RecyclerView , add the TextView : <android.support