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mongoDAO.js
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mongoDAO.js
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let mongo = require('mongodb').MongoClient;
const URL = `mongodb://127.0.0.1:27017/bookReader`;
const booksCollection = 'books';
exports.insertBook = function (book) {
mongo.connect(URL, function (err, db) {
if (err) {
throw err;
}
db.collection(booksCollection).insertOne(book, function (err) {
if (err) {
throw err;
}
db.close();
});
});
};
exports.findOneByTitle = function (title, callbackFunc) {
mongo.connect(URL, function (err, db) {
if (err) {
if(callbackFunc) return callbackFunc(err, null);
else throw err;
}
db.collection(booksCollection).findOne({title: title}, {}, function (err, result) {
if(callbackFunc) callbackFunc(err, result);
db.close();
});
});
};
exports.findAll = function(callbackFunc) {
mongo.connect(URL, function(err, db) {
if (err) {
return callbackFunc(err, null);
}
db.collection(booksCollection).find({}, {_id: 0}).toArray(function(err, items) {
if(err) {
throw err;
}
if(callbackFunc) callbackFunc(err, items);
db.close();
});
});
};
exports.updateBook = function(title, data) {
mongo.connect(URL, function(err, db) {
if (err) throw err;
db.collection(booksCollection)
.updateOne(
{title: title},
{$set: data},
function(err, result) {
db.close()
}
)
})
};
exports.deleteAllBooks = function (callbackFunc) {
mongo.connect(URL, function (err, db) {
if (err) {
return callbackFunc(err);
}
db.collection(booksCollection).deleteMany({}, function (err, result) {
if(callbackFunc) callbackFunc(err, result);
db.close()
}
)
});
};