WebSQL Legacy Support Library

This project was conceived in response to the deprecation of the WebSQL standard in newer versions of Chrome, as outlined in Chrome's official announcement. Recognizing the extensive amount of legacy code that relies on WebSQL, and the economic impracticality of rewriting such codebases, this implementation offers a solution. It allows legacy code to operate unchanged in new Chrome versions, ensuring continuity and stability for existing web applications reliant on WebSQL.

Usage Instructions

1. Download the src/ folder containing the library and place it within your project structure.
2. Include the library in your project using one of the following methods:

Method 1: In-Memory Mode

<script src="src/websql-memory.js?force=true&debug=false"></script>

This method loads the library in an in-memory mode, offering rapid performance with the trade-off that data is not preserved between page reloads. Suitable for projects where persistent data storage is not required.

Method 2: Persistent Storage Mode

<script type="module" src="src/websql-persistent.js?force=true&debug=false"></script>

This approach is slower but saves data between page reloads, making it suitable for most legacy projects that utilize WebSQL.

• force=true/false: If set to true, forces the use of this library even when WebSQL is supported by the browser. Otherwise, the library is only utilized if WebSQL is unavailable.
• debug=true/false: Toggles the output of extended debugging information in the browser's console, aiding in a deeper understanding of the processes involved.

Automatic Registration and Full WebSQL API Support

Once added to your page, the library automatically registers itself and supports the full WebSQL API https://www.w3.org/TR/webdatabase/ . This ensures that your legacy code will function as usual without any modifications.

Simple Examples of WebSQL Usage

Below are a few straightforward examples to illustrate the use of WebSQL:

1. Creating a Database:

   var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);

2. Creating a Table:

   db.transaction(function (tx) {
       tx.executeSql('CREATE TABLE IF NOT EXISTS LOGS (id unique, log)');
   });

3. Inserting Data:

   db.transaction(function (tx) {
      tx.executeSql('INSERT INTO LOGS (id, log) VALUES (1, "Sample log")');
   });

4. Querying Data:

   db.transaction(function (tx) {
      tx.executeSql('SELECT * FROM LOGS', [], function (tx, results) {
         var len = results.rows.length, i;
         for (i = 0; i < len; i++) {
           console.log(results.rows.item(i).log);
         }
      }, null);
   });