我希望能够更新和删除数据库中的评论,出于某种原因,Mustache.render(html, {id:id})
会显示正确的ID,但是当我在评论结束时Mustache.render(html, {id:id, person_created:comment, input:comment})
[0]
时不会在输入值字段中显示所有必要的数据。对于要更新的每条评论,应准备好正确的 person_created 和输入。
看看下面的代码。
forum.js
var express = require('express');
var sqlite3 = require('sqlite3');
var fs = require('fs');
var Mustache = require ('mustache');
var morgan = require('morgan');
var bodyParser = require('body-parser');
var methodOverride = require('method-override');
var db = new sqlite3.Database('./forum.db');
var app = express();
app.use(morgan('dev'));
app.use(bodyParser.urlencoded({extended: true}));
app.use(methodOverride('_method'));
app.get('/', function(req, res){
res.send(fs.readFileSync('./views/topics/index.html', 'utf8'));
});
app.get('/topics', function(req,res) {
var id = req.params.id;
res.locals.id = id;
var template = fs.readFileSync('./views/topics/topics.html', 'utf8');
db.all("SELECT * FROM topics;", function(err, topics){
var html = Mustache.render(template, {listoftopics: topics, id:id});
res.send(html);
});
});
app.get('/topics/new', function(req, res){
res.send(fs.readFileSync('./views/topics/new.html', 'utf8'));
});
app.get('/topics/:id', function(req, res){
var id = req.params.id;
res.locals.id = id;
db.all("SELECT * FROM topics where id= " + id + ";", {}, function(err, topic){
fs.readFile('./views/topics/edit.html', 'utf8', function(err, html) {
console.log(topic);
var renderedHTML = Mustache.render(html, topic[0]);
res.send(renderedHTML);
});
});
});
app.get('/topics/:id/comments/new', function(req, res) {
var id = req.params.id
res.locals.id = id
console.log(res.locals.id)
var template = fs.readFileSync('./views/comments/newComment.html', 'utf8');
db.all("SELECT * FROM comments where topic_id= " + id + ";", function(err, comments){
var html = Mustache.render(template, { id:id})
res.send(html);
});
});
app.get('/topics/:id/comments', function(req, res){
var id = req.params.id;
console.log(id)
db.all("SELECT * FROM topics WHERE id = " + id + ";", {}, function(err, topics){
console.log(topics)
db.all("SELECT * FROM comments WHERE topic_id = " + id + ";", {}, function (err, comments) {
fs.readFile('./views/topics/show.html', 'utf8', function(err, html){
var renderedHTML = Mustache.render(html, {body:topics, person_created:comments, input:comments, id:id});
res.send(renderedHTML);
console.log(comments);
});
});
});
});
app.get('/topics/:id/comments/edit', function(req, res){
var id = req.params.id;
res.locals.id = id
db.all('SELECT * FROM comments WHERE topic_id = ' + id + ';', {}, function(err, comment){
fs.readFile('./views/comments/edit.html', 'utf8', function(err, html){
console.log(comment)
var renderedHTML = Mustache.render(html, { id:id, person_created:comment, input:comment} );
res.send(renderedHTML)
});
});
});
app.post('/topics/new', function(req, res){
console.log(req.body);
db.run("INSERT INTO topics(title, creator, date, body) VALUES ('" + req.body.title + "','" + req.body.creator + "','" + req.body.date + "','" + req.body.body + "')");
res.redirect("/topics")
});
app.post('/topics/:id/comments/new', function(req, res){
var id = req.params.id
res.locals.id = id
console.log(id)
console.log(req.body.topic_id)
db.run("INSERT INTO comments (person_created, input, topic_id) VALUES ('" + req.body.person_created + "','" + req.body.input + "', '" + id + "')", function(error){
if (error) {
console.log('Error')
} else {
console.log('Success')
}
console.log(req.body)
});
res.redirect("/topics/" + id + "/comments")
});
app.put('/topics/:id', function(req, res){
var id = req.params.id;
res.locals.id = id
var topic = req.body
console.log(req.body)
db.run("UPDATE topics SET title = '" + topic.title + "', creator = '" + topic.creator + "', date = '" + topic.date + "', body = '" + topic.body + "' WHERE id = " + id + ";", function(err, updated){
if (err) {
console.log("Error");
} else {
console.log('Success')
}
});
res.redirect('/topics')
});
app.put('/topics/:id/comments/edit', function(req, res){
var id = req.params.id;
res.locals.id = id
var comment = req.body
console.log(req.body)
db.run("UPDATE comments SET person_created = '" + comment.person_created + "', input = '" + comment.input + "' WHERE topic_id = " + id + ";", function(err, updated){
if (err) {
console.log("Error");
} else {
console.log('Success')
}
});
res.redirect('/topics/' + id + '/comments')
});
app.delete('/topics/:id', function(req, res){
var id = req.params.id;
db.run('DELETE FROM topics WHERE id=' + id + ';', function(err, success){
if (err) {
console.log("Error")
}
else {
console.log('Success')
}
});
res.redirect('/topics')
});
app.delete('/topics/:id/comments/edit', function(req, res){
var id = req.params.id;
var comment = req.body;
console.log(comment)
db.run("DELETE FROM comments WHERE person_created=" + comment.person_created + ";", function(err, success) {
if (err) {
console.log('Error')
} else {
console.log('Success')
}
});
res.redirect('/topics/' + id + '/comments')
});
app.listen(3000, function(){
console.log("LISTENING!");
});
schema.js
var sqlite3 = require ('sqlite3');
var db = new sqlite3.Database('./forum.db');
db.serialize(function(){
db.run("CREATE TABLE topics(id integer primary key AUTOINCREMENT, title varchar, creator varchar, date varchar, body varchar);")
db.run("CREATE TABLE comments(person_created varchar, input varchar, topic_id integer, FOREIGN KEY (topic_id) references topics(id));")
db.parallelize(function(){
db.run("INSERT INTO topics(title, creator, date, body) VALUES ('Top R&B Hits of the 80s', 'Michael', '4/15/15', 'Please share some of your favorite R&B Hits from the decade!' );")
db.run("INSERT INTO comments(person_created, input, topic_id) VALUES ('Sheila', 'Billie Jean by Michael Jackson', 1);")
db.run("INSERT INTO comments(person_created, input, topic_id) VALUES ('George ', 'Get Outta of My Dreams by Billy Ocean', 1); ")
})
})
edit.html(评论)
<!DOCTYPE html>
<html lang='en'>
<head>
<style type="text/css">
body{
background-color: gray;
}
</style>
<meta charset='UTF-8'>
<title>Create New Comment</title>
</head>
<body>
<form action="/topics/{{id}}/comments/edit?_method=PUT" method="POST">
<center>
<label>
Name: <br />
<input type="text" name="person_created" id='topic_id' rows="10" cols="50" value='{{person_created }}'/>
</label>
<br />
<label>
Comment:<br />
<textarea type="text" name="input" value='{{ input }}'>
</textarea>
</label>
<br />
<input type="hidden" name="topic_id" value='{{ id }}' />
<input type='submit' value='UPDATE' />
</center>
</form>
<form action="/topics/{{id}}/comments/edit?_method=DELETE" method="POST">
<input type='submit' value='DELETE' />
</form>
</body>
</html>
来自edit.html的视图来源的输出(评论)
<!DOCTYPE html>
<html lang='en'>
<head>
<style type="text/css">
body{
background-color: gray;
}
</style>
<meta charset='UTF-8'>
<title>Create New Comment</title>
</head>
<body>
<form action="/topics/1/comments/edit?_method=PUT" method="POST">
<center>
<label>
Name:<br />
<input type="text" name="person_created" id='topic_id' rows="10" cols="50" value=''/>
</label>
<br />
<label>
Comment:<br />
<textarea type="text" name="input" value=''></textarea>
</label>
<br />
<input type="hidden" name="topic_id" value='1' />
<input type='submit' value='UPDATE' />
</center>
</form>
<form action="/topics/1/comments/edit?_method=DELETE" method="POST">
<input type='submit' value='DELETE' />
</form>
</body>
</html>