TaffyDB is a lightweight and powerful in-memory database that can be used in browsers and server-side applications. It is open source and free to use. In this tutorial, we will go through a few examples to show how to use TaffyDB to store some data, perform some queries on the data, and perform important operations on the data.
Let’s start with a simple example
Let's start with a very basic example where we will create some data and then try to print that data on the browser.
Our first step is to have TaffyDB. For this we have different options. The most basic method is to use a URL that contains a minified version of the "taffydb.js" file.
The code for "taffydb.js" can be found at this link. I suggest you open this link, then copy and paste the code into a file called "taffy.js". Otherwise, you can Just use their CDN.
Now that the dependencies are taken care of, let's focus on the "index.html" file, where we will write the core logic, within the <script> tags, of course. Consider the HTML code shown below. </script>
Example
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TaffyDB</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/taffydb/2.7.3/taffy-min.js"></script>
<script>
let countries = TAFFY([{
name: "India",
state: "Uttar Pradesh",
capital: "New Delhi",
}, {
name: "USA",
state: "California",
capital: "Washington DC",
}, {
name: "Germany",
state: "Berlin",
capital: "Berlin",
}]);
let countriesNames = [];
countries().each(function(r) {
countriesNames.push(r.name);
});
document.write(countriesNames);
</script>
</head>
<body>
</body>
</html>
If you run the above code in your browser, you should see the following output.
In the above code, we first imported the "taffy.js" file and then created a <script> tag inside the &ly;head> tag itself. Inside the <script> tag, we create a TAFFY object, in which we create an object array in which there are multiple objects with different properties. </script>
We then iterate over the values of the countries variables, and for each variable we put the value of the "name" attribute into an array called "countriesName".
If you run the above code in your browser, you should see the following output.
Insert records using TaffyDB
In the above example, we created an array of objects and passed it to the TIFFY method. Now let us focus on inserting a new object into the data, we can do this with the help of the insert() method. In the insert() method we can pass the same properties or different properties depending on our choice.
Consider the code snippet shown below, we can use it to Country variables in TaffyDB.
countries.insert({
name: "Brazil",
state: "State of São Paulo",
capital: "Brasília",
});
Example
index.html
The updated index.html code is as follows.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TaffyDB</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/taffydb/2.7.3/taffy-min.js"></script>
<script>
let countries = TAFFY([{
name: "India",
state: "Uttar Pradesh",
capital: "New Delhi",
}, {
name: "USA",
state: "California",
capital: "Washington DC",
}, {
name: "Germany",
state: "Berlin",
capital: "Berlin",
}]);
countries.insert({
name: "Brazil",
state: "State of São Paulo",
capital: "Brasília",
});
let countriesNames = [];
countries().each(function(r) {
countriesNames.push(r.name);
});
document.write(countriesNames);
</script>
</head>
<body>
</body>
</html>
If you run the above code in your browser you should see the following output -
Execute queries using TaffyDB
While we executed the query in the above example, let us execute a simple query again where we want to store the names of countries whose capital and state have the same value in the data.
Example
index.html
Consider the index.html code shown below.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TaffyDB</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/taffydb/2.7.3/taffy-min.js"></script>
<script>
let countries = TAFFY([{
name: "India",
state: "Uttar Pradesh",
capital: "New Delhi",
}, {
name: "USA",
state: "California",
capital: "Washington DC",
}, {
name: "Germany",
state: "Berlin",
capital: "Berlin",
}]);
countries.insert({
name: "Brazil",
state: "State of São Paulo",
capital: "Brasília",
});
let res = [];
countries().each(function(r) {
if (r.state === r.capital) {
res.push(r.name)
}
});
document.write(res);
</script>
</head>
<body>
</body>
</html>
In the above HTML code, we iterate over all the values of the countries variables with the help of the each() method and then compare "capital" and "declare" the attribute value with them. Then if there is a match we put the values into an array and finally print the array in the console.
If we run the above HTML file in a browser, we will terminal.
Now let's execute the query again, this time we want to print the name of the smallest country in lexicographic order. From the data in the example above, it would be "Brazil". Consider the HTML code shown below.
Example
index.html
Consider the index.html code shown below.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TaffyDB</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/taffydb/2.7.3/taffy-min.js"></script>
<script>
let countries = TAFFY([{
name: "India",
state: "Uttar Pradesh",
capital: "New Delhi",
}, {
name: "USA",
state: "California",
capital: "Washington DC",
}, {
name: "Germany",
state: "Berlin",
capital: "Berlin",
}]);
countries.insert({
name: "Brazil",
state: "State of São Paulo",
capital: "Brasília",
});
let res = countries().order("name").first().name;
document.write(res);
</script>
</head>
<body>
</body>
</html>
In the above code, the line containing the code countries().order("name").first().name is where we use the link named link, where the link Multiple methods. First, we sort the data by the name attribute, then select the first element from the sorted data, and finally, we extract the name attribute from that element.
If you run the above HTML file in your browser, you will see terminal.
Update data using TaffyDB
You can use the update() method to update data in TaffyDB. In this method, if we pass a property that does not exist in the object, then it will be appended; if it does exist, it will be updated.
Suppose you want to add a field to an object named "India" and add a new property named financialCapital: "Mumbai". Consider the HTML code shown below.
Example
index.html
Consider the index.html code shown below.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TaffyDB</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/taffydb/2.7.3/taffy-min.js"></script>
<script>
let countries = TAFFY([{
name: "India",
state: "Uttar Pradesh",
capital: "New Delhi",
}, {
name: "USA",
state: "California",
capital: "Washington DC",
}, {
name: "Germany",
state: "Berlin",
capital: "Berlin",
}]);
countries.insert({
name: "Brazil",
state: "State of São Paulo",
capital: "Brasília",
});
countries({
name: "India"
}).update({
financialCapital: "Mumbai"
})
countries().each(function(r) {
if (r.name == "India") {
document.write(r.financialCapital + "<br>")
} else {
document.write(r.capital + "<br>")
}
})
</script>
</head>
<body>
To verify that the data we added has been added to the database, I iterate over the object and then print the values using a simple "if-else" condition.
如果您在浏览器中运行上述 HTML 文件，您将在 终端。
使用“!”运算符
通过使用“!”运算符，您可以在 TaffyDB 中编写复杂的查询。考虑下面显示的 index.html 代码，其中我尝试使用“！”来打印除印度之外的所有具有该名称的国家/地区。运算符。
示例
index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>TaffyDB</title>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/taffydb/2.7.3/taffy-min.js"></script>
<script>
let countries = TAFFY([{
name: "India",
state: "Uttar Pradesh",
capital: "New Delhi",
}, {
name: "USA",
state: "California",
capital: "Washington DC",
}, {
name: "Germany",
state: "Berlin",
capital: "Berlin",
}]);
countries.insert({
name: "Brazil",
state: "State of São Paulo",
capital: "Brasília",
});
countries({
name: {
"!is": "India"
}
}).each(function(r) {
document.write(r.name + "<br>");
})
</script>
</head>
<body>
</body>
</html>
如果您在浏览器中运行上述 HTML 文件，您将在 终端。
结论
在本教程中，我们使用多个示例来演示如何在 TaffyDB 中执行 CRUD 操作。
The above is the detailed content of TaffyDB – JavaScript database for the browser. For more information, please follow other related articles on the PHP Chinese website!
Replace String Characters in JavaScriptMar 11, 2025 am 12:07 AMDetailed explanation of JavaScript string replacement method and FAQ This article will explore two ways to replace string characters in JavaScript: internal JavaScript code and internal HTML for web pages. Replace string inside JavaScript code The most direct way is to use the replace() method: str = str.replace("find","replace"); This method replaces only the first match. To replace all matches, use a regular expression and add the global flag g: str = str.replace(/fi
Custom Google Search API Setup TutorialMar 04, 2025 am 01:06 AMThis tutorial shows you how to integrate a custom Google Search API into your blog or website, offering a more refined search experience than standard WordPress theme search functions. It's surprisingly easy! You'll be able to restrict searches to y
8 Stunning jQuery Page Layout PluginsMar 06, 2025 am 12:48 AMLeverage jQuery for Effortless Web Page Layouts: 8 Essential Plugins jQuery simplifies web page layout significantly. This article highlights eight powerful jQuery plugins that streamline the process, particularly useful for manual website creation
Build Your Own AJAX Web ApplicationsMar 09, 2025 am 12:11 AMSo here you are, ready to learn all about this thing called AJAX. But, what exactly is it? The term AJAX refers to a loose grouping of technologies that are used to create dynamic, interactive web content. The term AJAX, originally coined by Jesse J
What is 'this' in JavaScript?Mar 04, 2025 am 01:15 AMCore points This in JavaScript usually refers to an object that "owns" the method, but it depends on how the function is called. When there is no current object, this refers to the global object. In a web browser, it is represented by window. When calling a function, this maintains the global object; but when calling an object constructor or any of its methods, this refers to an instance of the object. You can change the context of this using methods such as call(), apply(), and bind(). These methods call the function using the given this value and parameters. JavaScript is an excellent programming language. A few years ago, this sentence was
10 Mobile Cheat Sheets for Mobile DevelopmentMar 05, 2025 am 12:43 AMThis post compiles helpful cheat sheets, reference guides, quick recipes, and code snippets for Android, Blackberry, and iPhone app development. No developer should be without them! Touch Gesture Reference Guide (PDF) A valuable resource for desig
Improve Your jQuery Knowledge with the Source ViewerMar 05, 2025 am 12:54 AMjQuery is a great JavaScript framework. However, as with any library, sometimes it’s necessary to get under the hood to discover what’s going on. Perhaps it’s because you’re tracing a bug or are just curious about how jQuery achieves a particular UI
How do I create and publish my own JavaScript libraries?Mar 18, 2025 pm 03:12 PMArticle discusses creating, publishing, and maintaining JavaScript libraries, focusing on planning, development, testing, documentation, and promotion strategies.
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Dreamweaver Mac version
Visual web development tools
VSCode Windows 64-bit Download
A free and powerful IDE editor launched by Microsoft
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
