1634137399
Using the Prisma Data Proxy with Vercel, Prisma, Next.js, and PostgreSQL
In this video, you will learn about how the Early Access version of the Prisma Data Proxy solves database connection management in serverless environments.
The Prisma Data Proxy is an external connection pooler that sits between your app and your database so you can reliably use relational databases in serverless environments.
In the video, Daniel deploys a Next.js app built with Prisma and PostgreSQL to Vercel and runs a load test to show the database connection limit exhausted. He then imports the project to the Prisma Data Platform and configures the Prisma Data Proxy to eliminate database connection exhaustion.
Source code: https://github.com/2color/next-prisma-data-proxy
Sign up for Early Access to the Prisma Data Proxy: https://pris.ly/prisma-data-proxy
Timestamps:
00:00 The connection pooling problem in serverless environments
01:40 A look at the demo built using Next.js and Prisma
05:16 Deploying the application to Vercel without using the Data Proxy
06:16 Load testing to demonstrate the connection pooling problem using K6
08:12 A look at the Prisma Data Platform and setting up the Data proxy
12:20 Updating the Next.js demo project to use the Data Proxy
17:29 Adding the Data Proxy connection string to the project on Vercel
18:56 Setting to the Vercel build command to run migrations in builds
21:23 Running the load test with the Data Proxy and comparing the results
24:06 Summary
#prisma #postgresql #vercel #prisma #nextjs
What is GEEK
Buddha Community
1667425440
Pdf2gerb: Perl Script Converts PDF Files to Gerber format
pdf2gerb
Perl script converts PDF files to Gerber format
Pdf2Gerb generates Gerber 274X photoplotting and Excellon drill files from PDFs of a PCB. Up to three PDFs are used: the top copper layer, the bottom copper layer (for 2-sided PCBs), and an optional silk screen layer. The PDFs can be created directly from any PDF drawing software, or a PDF print driver can be used to capture the Print output if the drawing software does not directly support output to PDF.
The general workflow is as follows:
- Design the PCB using your favorite CAD or drawing software.
- Print the top and bottom copper and top silk screen layers to a PDF file.
- Run Pdf2Gerb on the PDFs to create Gerber and Excellon files.
- Use a Gerber viewer to double-check the output against the original PCB design.
- Make adjustments as needed.
- Submit the files to a PCB manufacturer.
Please note that Pdf2Gerb does NOT perform DRC (Design Rule Checks), as these will vary according to individual PCB manufacturer conventions and capabilities. Also note that Pdf2Gerb is not perfect, so the output files must always be checked before submitting them. As of version 1.6, Pdf2Gerb supports most PCB elements, such as round and square pads, round holes, traces, SMD pads, ground planes, no-fill areas, and panelization. However, because it interprets the graphical output of a Print function, there are limitations in what it can recognize (or there may be bugs).
See docs/Pdf2Gerb.pdf for install/setup, config, usage, and other info.
pdf2gerb_cfg.pm
#Pdf2Gerb config settings:
#Put this file in same folder/directory as pdf2gerb.pl itself (global settings),
#or copy to another folder/directory with PDFs if you want PCB-specific settings.
#There is only one user of this file, so we don't need a custom package or namespace.
#NOTE: all constants defined in here will be added to main namespace.
#package pdf2gerb_cfg;
use strict; #trap undef vars (easier debug)
use warnings; #other useful info (easier debug)
##############################################################################################
#configurable settings:
#change values here instead of in main pfg2gerb.pl file
use constant WANT_COLORS => ($^O !~ m/Win/); #ANSI colors no worky on Windows? this must be set < first DebugPrint() call
#just a little warning; set realistic expectations:
#DebugPrint("${\(CYAN)}Pdf2Gerb.pl ${\(VERSION)}, $^O O/S\n${\(YELLOW)}${\(BOLD)}${\(ITALIC)}This is EXPERIMENTAL software. \nGerber files MAY CONTAIN ERRORS. Please CHECK them before fabrication!${\(RESET)}", 0); #if WANT_DEBUG
use constant METRIC => FALSE; #set to TRUE for metric units (only affect final numbers in output files, not internal arithmetic)
use constant APERTURE_LIMIT => 0; #34; #max #apertures to use; generate warnings if too many apertures are used (0 to not check)
use constant DRILL_FMT => '2.4'; #'2.3'; #'2.4' is the default for PCB fab; change to '2.3' for CNC
use constant WANT_DEBUG => 0; #10; #level of debug wanted; higher == more, lower == less, 0 == none
use constant GERBER_DEBUG => 0; #level of debug to include in Gerber file; DON'T USE FOR FABRICATION
use constant WANT_STREAMS => FALSE; #TRUE; #save decompressed streams to files (for debug)
use constant WANT_ALLINPUT => FALSE; #TRUE; #save entire input stream (for debug ONLY)
#DebugPrint(sprintf("${\(CYAN)}DEBUG: stdout %d, gerber %d, want streams? %d, all input? %d, O/S: $^O, Perl: $]${\(RESET)}\n", WANT_DEBUG, GERBER_DEBUG, WANT_STREAMS, WANT_ALLINPUT), 1);
#DebugPrint(sprintf("max int = %d, min int = %d\n", MAXINT, MININT), 1);
#define standard trace and pad sizes to reduce scaling or PDF rendering errors:
#This avoids weird aperture settings and replaces them with more standardized values.
#(I'm not sure how photoplotters handle strange sizes).
#Fewer choices here gives more accurate mapping in the final Gerber files.
#units are in inches
use constant TOOL_SIZES => #add more as desired
(
#round or square pads (> 0) and drills (< 0):
.010, -.001, #tiny pads for SMD; dummy drill size (too small for practical use, but needed so StandardTool will use this entry)
.031, -.014, #used for vias
.041, -.020, #smallest non-filled plated hole
.051, -.025,
.056, -.029, #useful for IC pins
.070, -.033,
.075, -.040, #heavier leads
# .090, -.043, #NOTE: 600 dpi is not high enough resolution to reliably distinguish between .043" and .046", so choose 1 of the 2 here
.100, -.046,
.115, -.052,
.130, -.061,
.140, -.067,
.150, -.079,
.175, -.088,
.190, -.093,
.200, -.100,
.220, -.110,
.160, -.125, #useful for mounting holes
#some additional pad sizes without holes (repeat a previous hole size if you just want the pad size):
.090, -.040, #want a .090 pad option, but use dummy hole size
.065, -.040, #.065 x .065 rect pad
.035, -.040, #.035 x .065 rect pad
#traces:
.001, #too thin for real traces; use only for board outlines
.006, #minimum real trace width; mainly used for text
.008, #mainly used for mid-sized text, not traces
.010, #minimum recommended trace width for low-current signals
.012,
.015, #moderate low-voltage current
.020, #heavier trace for power, ground (even if a lighter one is adequate)
.025,
.030, #heavy-current traces; be careful with these ones!
.040,
.050,
.060,
.080,
.100,
.120,
);
#Areas larger than the values below will be filled with parallel lines:
#This cuts down on the number of aperture sizes used.
#Set to 0 to always use an aperture or drill, regardless of size.
use constant { MAX_APERTURE => max((TOOL_SIZES)) + .004, MAX_DRILL => -min((TOOL_SIZES)) + .004 }; #max aperture and drill sizes (plus a little tolerance)
#DebugPrint(sprintf("using %d standard tool sizes: %s, max aper %.3f, max drill %.3f\n", scalar((TOOL_SIZES)), join(", ", (TOOL_SIZES)), MAX_APERTURE, MAX_DRILL), 1);
#NOTE: Compare the PDF to the original CAD file to check the accuracy of the PDF rendering and parsing!
#for example, the CAD software I used generated the following circles for holes:
#CAD hole size: parsed PDF diameter: error:
# .014 .016 +.002
# .020 .02267 +.00267
# .025 .026 +.001
# .029 .03167 +.00267
# .033 .036 +.003
# .040 .04267 +.00267
#This was usually ~ .002" - .003" too big compared to the hole as displayed in the CAD software.
#To compensate for PDF rendering errors (either during CAD Print function or PDF parsing logic), adjust the values below as needed.
#units are pixels; for example, a value of 2.4 at 600 dpi = .0004 inch, 2 at 600 dpi = .0033"
use constant
{
HOLE_ADJUST => -0.004 * 600, #-2.6, #holes seemed to be slightly oversized (by .002" - .004"), so shrink them a little
RNDPAD_ADJUST => -0.003 * 600, #-2, #-2.4, #round pads seemed to be slightly oversized, so shrink them a little
SQRPAD_ADJUST => +0.001 * 600, #+.5, #square pads are sometimes too small by .00067, so bump them up a little
RECTPAD_ADJUST => 0, #(pixels) rectangular pads seem to be okay? (not tested much)
TRACE_ADJUST => 0, #(pixels) traces seemed to be okay?
REDUCE_TOLERANCE => .001, #(inches) allow this much variation when reducing circles and rects
};
#Also, my CAD's Print function or the PDF print driver I used was a little off for circles, so define some additional adjustment values here:
#Values are added to X/Y coordinates; units are pixels; for example, a value of 1 at 600 dpi would be ~= .002 inch
use constant
{
CIRCLE_ADJUST_MINX => 0,
CIRCLE_ADJUST_MINY => -0.001 * 600, #-1, #circles were a little too high, so nudge them a little lower
CIRCLE_ADJUST_MAXX => +0.001 * 600, #+1, #circles were a little too far to the left, so nudge them a little to the right
CIRCLE_ADJUST_MAXY => 0,
SUBST_CIRCLE_CLIPRECT => FALSE, #generate circle and substitute for clip rects (to compensate for the way some CAD software draws circles)
WANT_CLIPRECT => TRUE, #FALSE, #AI doesn't need clip rect at all? should be on normally?
RECT_COMPLETION => FALSE, #TRUE, #fill in 4th side of rect when 3 sides found
};
#allow .012 clearance around pads for solder mask:
#This value effectively adjusts pad sizes in the TOOL_SIZES list above (only for solder mask layers).
use constant SOLDER_MARGIN => +.012; #units are inches
#line join/cap styles:
use constant
{
CAP_NONE => 0, #butt (none); line is exact length
CAP_ROUND => 1, #round cap/join; line overhangs by a semi-circle at either end
CAP_SQUARE => 2, #square cap/join; line overhangs by a half square on either end
CAP_OVERRIDE => FALSE, #cap style overrides drawing logic
};
#number of elements in each shape type:
use constant
{
RECT_SHAPELEN => 6, #x0, y0, x1, y1, count, "rect" (start, end corners)
LINE_SHAPELEN => 6, #x0, y0, x1, y1, count, "line" (line seg)
CURVE_SHAPELEN => 10, #xstart, ystart, x0, y0, x1, y1, xend, yend, count, "curve" (bezier 2 points)
CIRCLE_SHAPELEN => 5, #x, y, 5, count, "circle" (center + radius)
};
#const my %SHAPELEN =
#Readonly my %SHAPELEN =>
our %SHAPELEN =
(
rect => RECT_SHAPELEN,
line => LINE_SHAPELEN,
curve => CURVE_SHAPELEN,
circle => CIRCLE_SHAPELEN,
);
#panelization:
#This will repeat the entire body the number of times indicated along the X or Y axes (files grow accordingly).
#Display elements that overhang PCB boundary can be squashed or left as-is (typically text or other silk screen markings).
#Set "overhangs" TRUE to allow overhangs, FALSE to truncate them.
#xpad and ypad allow margins to be added around outer edge of panelized PCB.
use constant PANELIZE => {'x' => 1, 'y' => 1, 'xpad' => 0, 'ypad' => 0, 'overhangs' => TRUE}; #number of times to repeat in X and Y directions
# Set this to 1 if you need TurboCAD support.
#$turboCAD = FALSE; #is this still needed as an option?
#CIRCAD pad generation uses an appropriate aperture, then moves it (stroke) "a little" - we use this to find pads and distinguish them from PCB holes.
use constant PAD_STROKE => 0.3; #0.0005 * 600; #units are pixels
#convert very short traces to pads or holes:
use constant TRACE_MINLEN => .001; #units are inches
#use constant ALWAYS_XY => TRUE; #FALSE; #force XY even if X or Y doesn't change; NOTE: needs to be TRUE for all pads to show in FlatCAM and ViewPlot
use constant REMOVE_POLARITY => FALSE; #TRUE; #set to remove subtractive (negative) polarity; NOTE: must be FALSE for ground planes
#PDF uses "points", each point = 1/72 inch
#combined with a PDF scale factor of .12, this gives 600 dpi resolution (1/72 * .12 = 600 dpi)
use constant INCHES_PER_POINT => 1/72; #0.0138888889; #multiply point-size by this to get inches
# The precision used when computing a bezier curve. Higher numbers are more precise but slower (and generate larger files).
#$bezierPrecision = 100;
use constant BEZIER_PRECISION => 36; #100; #use const; reduced for faster rendering (mainly used for silk screen and thermal pads)
# Ground planes and silk screen or larger copper rectangles or circles are filled line-by-line using this resolution.
use constant FILL_WIDTH => .01; #fill at most 0.01 inch at a time
# The max number of characters to read into memory
use constant MAX_BYTES => 10 * M; #bumped up to 10 MB, use const
use constant DUP_DRILL1 => TRUE; #FALSE; #kludge: ViewPlot doesn't load drill files that are too small so duplicate first tool
my $runtime = time(); #Time::HiRes::gettimeofday(); #measure my execution time
print STDERR "Loaded config settings from '${\(__FILE__)}'.\n";
1; #last value must be truthful to indicate successful load
#############################################################################################
#junk/experiment:
#use Package::Constants;
#use Exporter qw(import); #https://perldoc.perl.org/Exporter.html
#my $caller = "pdf2gerb::";
#sub cfg
#{
# my $proto = shift;
# my $class = ref($proto) || $proto;
# my $settings =
# {
# $WANT_DEBUG => 990, #10; #level of debug wanted; higher == more, lower == less, 0 == none
# };
# bless($settings, $class);
# return $settings;
#}
#use constant HELLO => "hi there2"; #"main::HELLO" => "hi there";
#use constant GOODBYE => 14; #"main::GOODBYE" => 12;
#print STDERR "read cfg file\n";
#our @EXPORT_OK = Package::Constants->list(__PACKAGE__); #https://www.perlmonks.org/?node_id=1072691; NOTE: "_OK" skips short/common names
#print STDERR scalar(@EXPORT_OK) . " consts exported:\n";
#foreach(@EXPORT_OK) { print STDERR "$_\n"; }
#my $val = main::thing("xyz");
#print STDERR "caller gave me $val\n";
#foreach my $arg (@ARGV) { print STDERR "arg $arg\n"; }Download Details:
Author: swannman
Source Code: https://github.com/swannman/pdf2gerb
License: GPL-3.0 license
1634137399
Using the Prisma Data Proxy with Vercel, Prisma, Next.js, and PostgreSQL
In this video, you will learn about how the Early Access version of the Prisma Data Proxy solves database connection management in serverless environments.
The Prisma Data Proxy is an external connection pooler that sits between your app and your database so you can reliably use relational databases in serverless environments.
In the video, Daniel deploys a Next.js app built with Prisma and PostgreSQL to Vercel and runs a load test to show the database connection limit exhausted. He then imports the project to the Prisma Data Platform and configures the Prisma Data Proxy to eliminate database connection exhaustion.
Source code: https://github.com/2color/next-prisma-data-proxy
Sign up for Early Access to the Prisma Data Proxy: https://pris.ly/prisma-data-proxy
Timestamps:
00:00 The connection pooling problem in serverless environments
01:40 A look at the demo built using Next.js and Prisma
05:16 Deploying the application to Vercel without using the Data Proxy
06:16 Load testing to demonstrate the connection pooling problem using K6
08:12 A look at the Prisma Data Platform and setting up the Data proxy
12:20 Updating the Next.js demo project to use the Data Proxy
17:29 Adding the Data Proxy connection string to the project on Vercel
18:56 Setting to the Vercel build command to run migrations in builds
21:23 Running the load test with the Data Proxy and comparing the results
24:06 Summary
#prisma #postgresql #vercel #prisma #nextjs
1685205672
Create Pagination Using jQuery
In this article, we will see how to create pagination using jquery. We will create jquery pagination using multiple ways. You can create pagination using different ways like creating pagination using simple HTML, you can create pagination in laravel using paginate() method. Also, create pagination laravel livewire, pagination using bootstrap.
We will create simple jquery pagination. Also, create pagination using jquery without a plugin and create jquery pagination with next and previous buttons
So, let's see dynamic pagination in jquery and bootstrap pagination in jquery
Example:
In this example, we will create pagination using jquery without using a plugin. Also, you can customize the pagination.
<!DOCTYPE html>
<html lang="en">
<head>
<title>How To Create Pagination Using jQuery - Websolutionstuff</title>
<style>
.current {
color: green;
}
#pagin li {
display: inline-block;
font-weight: 500;
}
.prev {
cursor: pointer;
}
.next {
cursor: pointer;
}
.last {
cursor:pointer;
margin-left:10px;
}
.first {
cursor:pointer;
margin-right:10px;
}
.line-content, #pagin, h3 {
text-align:center;
}
.line-content {
margin-top:20px;
}
#pagin {
margin-top:10px;
padding-left:0;
}
h3 {
margin:50px 0;
}
</style>
</head>
<body>
<h3>How To Create Pagination Using jQuery - Websolutionstuff</h3>
<div class="line-content">This is Page 1 content example with next and prev.</div>
<div class="line-content">This is Page 2 content example with next and prev.</div>
<div class="line-content">This is Page 3 content example with next and prev.</div>
<div class="line-content">This is Page 4 content example with next and prev.</div>
<div class="line-content">This is Page 5 content example with next and prev.</div>
<div class="line-content">This is Page 6 content example with next and prev.</div>
<div class="line-content">This is Page 7 content example with next and prev.</div>
<div class="line-content">This is Page 8 content example with next and prev.</div>
<div class="line-content">This is Page 9 content example with next and prev.</div>
<div class="line-content">This is Page 10 content example with next and prev.</div>
<div class="line-content">This is Page 11 content example with next and prev.</div>
<div class="line-content">This is Page 12 content example with next and prev.</div>
<div class="line-content">This is Page 13 content example with next and prev.</div>
<div class="line-content">This is Page 14 content example with next and prev.</div>
<div class="line-content">This is Page 15 content example with next and prev.</div>
<div class="line-content">This is Page 16 content example with next and prev.</div>
<div class="line-content">This is Page 17 content example with next and prev.</div>
<div class="line-content">This is Page 18 content example with next and prev.</div>
<div class="line-content">This is Page 19 content example with next and prev.</div>
<div class="line-content">This is Page 20 content example with next and prev.</div>
<div class="line-content">This is Page 21 content example with next and prev.</div>
<div class="line-content">This is Page 22 content example with next and prev.</div>
<div class="line-content">This is Page 23 content example with next and prev.</div>
<div class="line-content">This is Page 24 content example with next and prev.</div>
<div class="line-content">This is Page 25 content example with next and prev.</div>
<div class="line-content">This is Page 26 content example with next and prev.</div>
<div class="line-content">This is Page 27 content example with next and prev.</div>
<div class="line-content">This is Page 28 content example with next and prev.</div>
<div class="line-content">This is Page 29 content example with next and prev.</div>
<div class="line-content">This is Page 30 content example with next and prev.</div>
<div class="line-content">This is Page 31 content example with next and prev.</div>
<div class="line-content">This is Page 32 content example with next and prev.</div>
<div class="line-content">This is Page 33 content example with next and prev.</div>
<div class="line-content">This is Page 34 content example with next and prev.</div>
<div class="line-content">This is Page 35 content example with next and prev.</div>
<div class="line-content">This is Page 36 content example with next and prev.</div>
<div class="line-content">This is Page 37 content example with next and prev.</div>
<div class="line-content">This is Page 38 content example with next and prev.</div>
<div class="line-content">This is Page 39 content example with next and prev.</div>
<div class="line-content">This is Page 40 content example with next and prev.</div>
<div class="line-content">This is Page 41 content example with next and prev.</div>
<div class="line-content">This is Page 42 content example with next and prev.</div>
<div class="line-content">This is Page 43 content example with next and prev.</div>
<div class="line-content">This is Page 44 content example with next and prev.</div>
<div class="line-content">This is Page 45 content example with next and prev.</div>
<ul id="pagin"></ul>
</body>
</html>
<script src="https://code.jquery.com/jquery-3.6.1.min.js" integrity="sha256-o88AwQnZB+VDvE9tvIXrMQaPlFFSUTR+nldQm1LuPXQ=" crossorigin="anonymous"></script>
<script>
pageSize = 5;
incremSlide = 5;
startPage = 0;
numberPage = 0;
var pageCount = $(".line-content").length / pageSize;
var totalSlidepPage = Math.floor(pageCount / incremSlide);
for(var i = 0 ; i<pageCount;i++){
$("#pagin").append('<li><a href="#">'+(i+1)+'</a></li> ');
if(i>pageSize){
$("#pagin li").eq(i).hide();
}
}
var prev = $("<li/>").addClass("prev").html("Prev").click(function(){
startPage-=5;
incremSlide-=5;
numberPage--;
slide();
});
prev.hide();
var next = $("<li/>").addClass("next").html("Next").click(function(){
startPage+=5;
incremSlide+=5;
numberPage++;
slide();
});
$("#pagin").prepend(prev).append(next);
$("#pagin li").first().find("a").addClass("current");
slide = function(sens){
$("#pagin li").hide();
for(t=startPage;t<incremSlide;t++){
$("#pagin li").eq(t+1).show();
}
if(startPage == 0){
next.show();
prev.hide();
}else if(numberPage == totalSlidepPage ){
next.hide();
prev.show();
}else{
next.show();
prev.show();
}
}
showPage = function(page) {
$(".line-content").hide();
$(".line-content").each(function(n) {
if (n >= pageSize * (page - 1) && n < pageSize * page){
$(this).show();
}
});
}
showPage(1);
$("#pagin li a").eq(0).addClass("current");
$("#pagin li a").click(function() {
$("#pagin li a").removeClass("current");
$(this).addClass("current");
showPage(parseInt($(this).text()));
});
</script>Output:
Example:
In this example, we will create bootstrap pagination with help of jquery.
<!DOCTYPE html>
<html lang="en">
<head>
<title>How To Create Bootstrap Pagination Using jQuery - Websolutionstuff</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
<style>
#data tr {
display: none;
}
.page {
margin: 30px;
}
table, th, td {
border: 1px solid black;
}
#data {
font-family: Arial, Helvetica, sans-serif;
border-collapse: collapse;
width: 100%;
}
#data td, #data th {
border: 1px solid #ddd;
padding: 8px;
}
#data tr:nth-child(even) {
background-color: #f2f2f2;
}
#data tr:hover {
background-color: #ddd;
}
#data th {
padding-top: 12px;
padding-bottom: 12px;
text-align: left;
background-color: #03aa96;
color: white;
}
#nav a {
color: #03aa96;
font-size: 20px;
margin-top: 22px;
font-weight: 600;
}
a:hover, a:visited, a:link, a:active {
text-decoration: none;
}
#nav {
margin-top: 20px;
}
</style>
</head>
<body>
<h2 align="center" class="mt-4">How To Create Bootstrap Pagination Using jQuery - Websolutionstuff</h2>
<div class="page" align="center">
<table id="data">
<tr>
<th>Id</th>
<th>Name</th>
<th>Country</th>
</tr>
<tr>
<td>1</td>
<td>Maria</td>
<td>Germany</td>
</tr>
<tr>
<td>2</td>
<td>Christina</td>
<td>Sweden</td>
</tr>
<tr>
<td>3</td>
<td>Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>4</td>
<td>Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>5</td>
<td>Helen</td>
<td>United Kingdom</td>
</tr>
<tr>
<td>6</td>
<td>Philip</td>
<td>Germany</td>
</tr>
<tr>
<td>7</td>
<td>Tannamuri</td>
<td>Canada</td>
</tr>
<tr>
<td>8</td>
<td>Rovelli</td>
<td>Italy</td>
</tr>
<tr>
<td>9</td>
<td>Dell</td>
<td>United Kingdom</td>
</tr>
<tr>
<td>10</td>
<td>Trump</td>
<td>France</td>
</tr>
</table>
</div>
</body>
</html>
<script src="https://code.jquery.com/jquery-3.6.1.min.js" integrity="sha256-o88AwQnZB+VDvE9tvIXrMQaPlFFSUTR+nldQm1LuPXQ=" crossorigin="anonymous"></script>
<script>
$(document).ready (function () {
$('#data').after ('<div id="nav"></div>');
var rowsShown = 5;
var rowsTotal = $('#data tbody tr').length;
var numPages = rowsTotal/rowsShown;
for (i = 0;i < numPages;i++) {
var pageNum = i + 1;
$('#nav').append ('<a href="#" rel="'+i+'">'+pageNum+'</a> ');
}
$('#data tbody tr').hide();
$('#data tbody tr').slice (0, rowsShown).show();
$('#nav a:first').addClass('active');
$('#nav a').bind('click', function() {
$('#nav a').removeClass('active');
$(this).addClass('active');
var currPage = $(this).attr('rel');
var startItem = currPage * rowsShown;
var endItem = startItem + rowsShown;
$('#data tbody tr').css('opacity','0.0').hide().slice(startItem, endItem).
css('display','table-row').animate({opacity:1}, 300);
});
});
</script>Output:
Example:
In this example, we will create pagination using the twbsPagination plugin. This jQuery plugin simplifies the usage of Bootstrap Pagination.
<!DOCTYPE html>
<html lang="en">
<head>
<title>jQuery Pagination Using Plugin - Websolutionstuff</title>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
<style>
.wrapper{
margin: 60px auto;
text-align: center;
}
h2{
margin-bottom: 1.25em;
}
#pagination-demo{
display: inline-block;
margin-bottom: 1.75em;
}
#pagination-demo li{
display: inline-block;
}
.page-content{
background: #eee;
display: inline-block;
padding: 10px;
width: 100%;
max-width: 660px;
}
</style>
</head>
<body>
<div class="wrapper">
<div class="container">
<div class="row">
<div class="col-sm-12">
<h2>jQuery Pagination Using Plugin - Websolutionstuff</h2>
<p>Simple pagination using the TWBS pagination JS library.</p>
<ul id="pagination-demo" class="pagination-sm"></ul>
</div>
</div>
<div id="page-content" class="page-content">Page 1</div>
</div>
</div>
</body>
</html>
<script src="https://code.jquery.com/jquery-3.6.1.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twbs-pagination/1.4.1/jquery.twbsPagination.min.js"></script>
<script>
$(document).ready (function () {
$('#pagination-demo').twbsPagination({
totalPages: 16,
visiblePages: 6,
next: 'Next',
prev: 'Prev',
onPageClick: function (event, page) {
$('#page-content').text('Page ' + page) + ' content here';
}
});
});
</script>Output:
Original article source at: https://websolutionstuff.com/
1620466520
Your Data Architecture: Simple Best Practices for Your Data Strategy
If you accumulate data on which you base your decision-making as an organization, you should probably think about your data architecture and possible best practices.
If you accumulate data on which you base your decision-making as an organization, you most probably need to think about your data architecture and consider possible best practices. Gaining a competitive edge, remaining customer-centric to the greatest extent possible, and streamlining processes to get on-the-button outcomes can all be traced back to an organization’s capacity to build a future-ready data architecture.
In what follows, we offer a short overview of the overarching capabilities of data architecture. These include user-centricity, elasticity, robustness, and the capacity to ensure the seamless flow of data at all times. Added to these are automation enablement, plus security and data governance considerations. These points from our checklist for what we perceive to be an anticipatory analytics ecosystem.
#big data #data science #big data analytics #data analysis #data architecture #data transformation #data platform #data strategy #cloud data platform #data acquisition
1632537859
NBB: Ad-hoc CLJS Scripting on Node.js
Nbb
Not babashka. Node.js babashka!?
Ad-hoc CLJS scripting on Node.js.
Status
Experimental. Please report issues here.
Goals and features
Nbb's main goal is to make it easy to get started with ad hoc CLJS scripting on Node.js.
Additional goals and features are:
- Fast startup without relying on a custom version of Node.js.
- Small artifact (current size is around 1.2MB).
- First class macros.
- Support building small TUI apps using Reagent.
- Complement babashka with libraries from the Node.js ecosystem.
Requirements
Nbb requires Node.js v12 or newer.
How does this tool work?
CLJS code is evaluated through SCI, the same interpreter that powers babashka. Because SCI works with advanced compilation, the bundle size, especially when combined with other dependencies, is smaller than what you get with self-hosted CLJS. That makes startup faster. The trade-off is that execution is less performant and that only a subset of CLJS is available (e.g. no deftype, yet).
Usage
Install nbb from NPM:
$ npm install nbb -g
Omit -g for a local install.
Try out an expression:
$ nbb -e '(+ 1 2 3)'
6
And then install some other NPM libraries to use in the script. E.g.:
$ npm install csv-parse shelljs zx
Create a script which uses the NPM libraries:
(ns script
(:require ["csv-parse/lib/sync$default" :as csv-parse]
["fs" :as fs]
["path" :as path]
["shelljs$default" :as sh]
["term-size$default" :as term-size]
["zx$default" :as zx]
["zx$fs" :as zxfs]
[nbb.core :refer [*file*]]))
(prn (path/resolve "."))
(prn (term-size))
(println (count (str (fs/readFileSync *file*))))
(prn (sh/ls "."))
(prn (csv-parse "foo,bar"))
(prn (zxfs/existsSync *file*))
(zx/$ #js ["ls"])
Call the script:
$ nbb script.cljs
"/private/tmp/test-script"
#js {:columns 216, :rows 47}
510
#js ["node_modules" "package-lock.json" "package.json" "script.cljs"]
#js [#js ["foo" "bar"]]
true
$ ls
node_modules
package-lock.json
package.json
script.cljs
Macros
Nbb has first class support for macros: you can define them right inside your .cljs file, like you are used to from JVM Clojure. Consider the plet macro to make working with promises more palatable:
(defmacro plet
[bindings & body]
(let [binding-pairs (reverse (partition 2 bindings))
body (cons 'do body)]
(reduce (fn [body [sym expr]]
(let [expr (list '.resolve 'js/Promise expr)]
(list '.then expr (list 'clojure.core/fn (vector sym)
body))))
body
binding-pairs)))
Using this macro we can look async code more like sync code. Consider this puppeteer example:
(-> (.launch puppeteer)
(.then (fn [browser]
(-> (.newPage browser)
(.then (fn [page]
(-> (.goto page "https://clojure.org")
(.then #(.screenshot page #js{:path "screenshot.png"}))
(.catch #(js/console.log %))
(.then #(.close browser)))))))))
Using plet this becomes:
(plet [browser (.launch puppeteer)
page (.newPage browser)
_ (.goto page "https://clojure.org")
_ (-> (.screenshot page #js{:path "screenshot.png"})
(.catch #(js/console.log %)))]
(.close browser))
See the puppeteer example for the full code.
Since v0.0.36, nbb includes promesa which is a library to deal with promises. The above plet macro is similar to promesa.core/let.
Startup time
$ time nbb -e '(+ 1 2 3)'
6
nbb -e '(+ 1 2 3)' 0.17s user 0.02s system 109% cpu 0.168 total
The baseline startup time for a script is about 170ms seconds on my laptop. When invoked via npx this adds another 300ms or so, so for faster startup, either use a globally installed nbb or use $(npm bin)/nbb script.cljs to bypass npx.
Dependencies
NPM dependencies
Nbb does not depend on any NPM dependencies. All NPM libraries loaded by a script are resolved relative to that script. When using the Reagent module, React is resolved in the same way as any other NPM library.
Classpath
To load .cljs files from local paths or dependencies, you can use the --classpath argument. The current dir is added to the classpath automatically. So if there is a file foo/bar.cljs relative to your current dir, then you can load it via (:require [foo.bar :as fb]). Note that nbb uses the same naming conventions for namespaces and directories as other Clojure tools: foo-bar in the namespace name becomes foo_bar in the directory name.
To load dependencies from the Clojure ecosystem, you can use the Clojure CLI or babashka to download them and produce a classpath:
$ classpath="$(clojure -A:nbb -Spath -Sdeps '{:aliases {:nbb {:replace-deps {com.github.seancorfield/honeysql {:git/tag "v2.0.0-rc5" :git/sha "01c3a55"}}}}}')"
and then feed it to the --classpath argument:
$ nbb --classpath "$classpath" -e "(require '[honey.sql :as sql]) (sql/format {:select :foo :from :bar :where [:= :baz 2]})"
["SELECT foo FROM bar WHERE baz = ?" 2]
Currently nbb only reads from directories, not jar files, so you are encouraged to use git libs. Support for .jar files will be added later.
Current file
The name of the file that is currently being executed is available via nbb.core/*file* or on the metadata of vars:
(ns foo
(:require [nbb.core :refer [*file*]]))
(prn *file*) ;; "/private/tmp/foo.cljs"
(defn f [])
(prn (:file (meta #'f))) ;; "/private/tmp/foo.cljs"
Reagent
Nbb includes reagent.core which will be lazily loaded when required. You can use this together with ink to create a TUI application:
$ npm install ink
ink-demo.cljs:
(ns ink-demo
(:require ["ink" :refer [render Text]]
[reagent.core :as r]))
(defonce state (r/atom 0))
(doseq [n (range 1 11)]
(js/setTimeout #(swap! state inc) (* n 500)))
(defn hello []
[:> Text {:color "green"} "Hello, world! " @state])
(render (r/as-element [hello]))
Promesa
Working with callbacks and promises can become tedious. Since nbb v0.0.36 the promesa.core namespace is included with the let and do! macros. An example:
(ns prom
(:require [promesa.core :as p]))
(defn sleep [ms]
(js/Promise.
(fn [resolve _]
(js/setTimeout resolve ms))))
(defn do-stuff
[]
(p/do!
(println "Doing stuff which takes a while")
(sleep 1000)
1))
(p/let [a (do-stuff)
b (inc a)
c (do-stuff)
d (+ b c)]
(prn d))
$ nbb prom.cljs
Doing stuff which takes a while
Doing stuff which takes a while
3
Also see API docs.
Js-interop
Since nbb v0.0.75 applied-science/js-interop is available:
(ns example
(:require [applied-science.js-interop :as j]))
(def o (j/lit {:a 1 :b 2 :c {:d 1}}))
(prn (j/select-keys o [:a :b])) ;; #js {:a 1, :b 2}
(prn (j/get-in o [:c :d])) ;; 1
Most of this library is supported in nbb, except the following:
- destructuring using
:syms - property access using
.-xnotation. In nbb, you must use keywords.
See the example of what is currently supported.
Examples
See the examples directory for small examples.
Also check out these projects built with nbb:
- c64core: retrocompute aesthetics twitter bot
- gallery.cljs: script to download walpapers from windowsonearth.org.
- nbb-action-example: example of a Github action built with nbb.
API
See API documentation.
Migrating to shadow-cljs
See this gist on how to convert an nbb script or project to shadow-cljs.
Build
Prequisites:
- babashka >= 0.4.0
- Clojure CLI >= 1.10.3.933
- Node.js 16.5.0 (lower version may work, but this is the one I used to build)
To build:
- Clone and cd into this repo
bb release
Run bb tasks for more project-related tasks.
Download Details:
Author: borkdude
Download Link: Download The Source Code
Official Website: https://github.com/borkdude/nbb
License: EPL-1.0
#node #javascript