[quantitative investment system]django realizes screening and paging from the database

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Django Filtering data classification can only jump to the first page , Page 2 no data .

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1.models.py Creating models

class User(models.Model):
    uname= models.CharField(max_length=20)
    uEmail= models.CharField(max_length=35)
    uphone= models.CharField(max_length=15)

2.views.py Filter data from the database

    if request.method == 'POST':
        name = request.POST.get('code')
    else:
        name = request.GET.get('code')
    UserList = User.objects.filter(uphone=name).order_by()

3. Pager

    paginator = Paginator(UserList,2)  # 3 posts in each page
    page = request.GET.get('page')
    try:
        pagedata = paginator.page(page)
    except PageNotAnInteger:
        # If page is not an integer deliver the first page
        pagedata = paginator.page(1)
    except EmptyPage:
    # # If page is out of range deliver last page of results
        pagedata = paginator.page(paginator.num_pages)

4. To transfer data

    return (render(request,'Qt15606/students.html',{
    'name':name,'page': pagedata,'pagedata': pagedata}))

5. Front end interface students.html

<div class="pagination">
    <span class="step-links">
        {
    % if page.has_previous %}
            <a style="font-weight:bold;color:#383957;" href="?page=1&code={
    {name}}" > first page </a>
            <a class="btn btn-primary btn-lg active" href="?page={
    {page.previous_page_number}}&code={
    {name}}"> The previous page </a>
        {
    % endif %}
                <span style="font-weight:bold;color:#383957" class="current">
                     The first {
    {
     page.number}} page  ···  common  {
    {
     page.paginator.num_pages}} page 
                </span>
        {
    % if page.has_next %}
            <a class="btn btn-primary btn-lg active" href="?page={
    {page.next_page_number }}&code={
    {name}}"> The next page </a>
            <a class="btn btn-primary btn-lg active" href="?page={
    {page.paginator.num_pages}}&code={
    {name}}"> The last page </a>
        {
    % endif %}
    </span>
</div>

The most important step is to add filter conditions to the links .href="?page={ {page.next_page_number }}&code={ {name}}"