在哪里可以了解如何将html5用于客户端数据库应用程序？ [英] Where can I learn about how to use html5 for client-side database apps?
问题描述
我想开始使用html5的客户端数据库功能，但我不知道在哪里可以找到一个好的介绍/教程/操作方法。我多年来一直在编码（x）html，所以我对这里的< head> 元素类型的介绍并不感兴趣;我想了解一般html5中的 new 是什么，特别是客户端db。有什么建议吗？
I would like to begin using the client-side database functionality of html5, but I don't know where to go for a good introduction/tutorial/how-to. I've been coding (x)html for years and years, so I'm not so much interested in a "here's the <head> element" type of introduction; I want to learn about what's new in html5 in general, and client-side db in particular. Any suggestions?
推荐答案
Alex，
我写了一个详细的方法，如何在 http://wecreategames.com/blog/?p=219 - 包括要下载的源代码。这里有几个片段：
Alex, I wrote up a detailed method of how to do it at: http://wecreategames.com/blog/?p=219 - including source code to download. Here's a few snippets:
function picsInitDatabase() {
try {
if (!window.openDatabase) {
console.log('Databases are not supported in this browser');
} else {
var shortName = 'picsGeoDB';
var version = '1.0';
var displayName = 'Pictures Geotagged database';
var maxSize = 5000000; // in bytes
picsDB = openDatabase(shortName, version, displayName, maxSize);
console.log("Database is setup: "+picsDB);
}
} catch(e) {
// Error handling code goes here.
if (e == 2) {
// Version number mismatch.
console.log("Invalid database version.");
} else {
console.log("Unknown error "+e+".");
}
return;
}
}
这是更新表格的函数：
function picsUpdateTables(dataID) {
picsDB.transaction(
function (transaction) {
var p = data[dataID];
transaction.executeSql("INSERT INTO geopictures (id, secret, server, farm, title, latitude, longitude, accuracy, datetaken, ownername) VALUES (?,?,?,?,?,?,?,?,?,?);",
[p.id, p.secret, p.server, p.farm, p.title, p.latitude, p.longitude, p.accuracy, p.datetaken, p.ownername] );
transaction.executeSql("INSERT INTO photodata (picid, encodedtext) VALUES (?, ?)", [p.id, serializeCanvasByID(p.id)] );
}
);
}
有关如何执行SQL SELECTS的示例和视频，请参阅博客文章展示如何在几个浏览器上测试它。
See the blog post for examples of how to do SQL SELECTS, and a video showing how to test it on a few browsers.
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