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How to operate WebSQL database with H5

php中世界最好的语言Original: 2018-03-27 10:10:103672browse

This time I will show you how to operate the WebSQL database in H5. What are the precautions for H5 to operate the WebSQL database? The following is a practical case, let's take a look.

HTML code:

<!DOCTYPE html>
<html>
    <head lang="en">
        <meta charset="UTF-8">
        <title>列车时刻表查询</title>
        <meta name="viewport" content="width=device-width,initial-scale=1">
        <link rel="stylesheet" href="http://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css" />
        <script src="http://code.jquery.com/jquery-1.11.1.min.js"></script>
        <script src="http://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script>
    </head>
    <script src="js/connect.js"></script>
    <body onload="init()">
        <p data-role="page" id="pageone">
            <p data-role="header" data-position="fixed">
                <h1>列车时刻表查询</h1>
            </p>
            <p data-role="main" class="ui-content">
                <p align="center">请给我留言</p>
                <table data-role="table" class="ui-responsive">
                    <thead>
                        <tr>
                            <th>姓名：</th>
                            <th>留言：</th>
                        </tr>
                    </thead>
                    <tbody>
                        <tr>
                            <td><input type="text" id="name"></td>
                            <td><input type="text" id="memo"></td>
                        </tr>
                    </tbody>
                </table>
                <button type="submit" onclick="saveData()">留言</button>
                <table data-role="table" data-mode="" class="ui-responsive" id="datatable">
                    <!--这里是留言板的显示区域-->
                </table>
            </p>
            <!--
                作者：ceet@vip.qq.com
                时间：2017-08-26
                描述：底部TAB
            -->
            <p data-role="footer" data-position="fixed">
                <p data-role="navbar">
                    <ul>
                        <li>
                            <a href="index.html#index" data-icon="grid" class="ui-btn-active">查询</a>
                        </li>
                        <li>
                            <a href="index.html#detail" data-rel="popup" data-icon="star">收藏</a>
                        </li>
                        <li>
                            <a href="test.html" data-icon="comment">给我留言</a>
                        </li>
                    </ul>
                </p>
            </p>
            <!--收藏功能-->
            <p data-role="popup" id="myPopup" class="ui-content" data-theme="b">
              <a href="#" data-rel="back" class="ui-btn ui-btn-a ui-corner-all ui-shadow ui-btn ui-icon-delete ui-btn-icon-notext ui-btn-right">Close</a>
              <p>收藏成功，暂且不做处理!.</p>
              <p>请点击右上角有个关闭按钮</p>
              <p><b>提示：</b> 你也可以点击弹窗的外部区域来关闭弹窗。</p>
            </p>
        </p>
    </body>
</html>

JS code:

/**
 * HTML5 操作本地WebSQL数据库
 * 作者：汪政
 * 时间：2017/08/26 15：03：19
 */
var datatable = null;
var db = openDatabase("MyData", "", "My Database", 1024 * 100);
//初始化函数方法
function init() {
    datatable = document.getElementById("datatable");
    showAllData();
}
//首先移除乱七八糟的东西
function removeAllData() {
    for(var i = datatable.childNodes.length - 1; i >= 0; i--) {
        datatable.removeChild(datatable.childNodes[i]);
    }
    var tr = document.createElement("tr");
    var th1 = document.createElement("th");
    var th2 = document.createElement("th");
    var th3 = document.createElement("th");
    th1.innerHTML = "姓名";
    th2.innerHTML = "留言";
    th3.innerHTML = "时间";
    tr.appendChild(th1);
    tr.appendChild(th2);
    tr.appendChild(th3);
    datatable.appendChild(tr);
}
//显示WebSQL中的数据
function showData(row) {
    var tr = document.createElement("tr");
    var td1 = document.createElement("td");
    td1.innerHTML = row.name;
    var td2 = document.createElement("td");
    td2.innerHTML = row.message;
    var td3 = document.createElement("td");
    var t = new Date();
    t.setTime(row.time);
    td3.innerHTML = t.toLocaleDateString() + " " + t.toLocaleTimeString();
    tr.appendChild(td1);
    tr.appendChild(td2);
    tr.appendChild(td3);
    datatable.appendChild(tr);
}
//显示所有的数据
function showAllData() {
    db.transaction(function(tx) {
        tx.executeSql("CREATE TABLE IF NOT EXISTS MsgData(name TEXT,message TEXT,time INTEGER)", []);
        tx.executeSql("SELECT * FROM MsgData", [], function(tx, rs) {
            removeAllData();
            for(var i = 0; i < rs.rows.length; i++) {
                showData(rs.rows.item(i))
            }
        })
    })
}
//添加数据
function addData(name, message, time) {
    db.transaction(function(tx) {
        tx.executeSql("INSERT INTO MsgData VALUES (?,?,?)", [name, message, time], function(tx, rs) {
                alert("留言成功！");
            },
            function(tx, error) {
                alert(error.source + "::" + error.message);
            }
    )
    })
}
//调用
function saveData() {
    var name = document.getElementById("name").value;
    var memo = document.getElementById("memo").value;
    var time = new Date().getTime();
    addData(name, memo, time);
    showAllData();
}

I believe you have mastered it after reading the case in this article Method, for more exciting information, please pay attention to other related articles on the php Chinese website!

How to operate WebSQL database with H5

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