我遇到了针对 Android 和 iOS 构建的 PhoneGap 应用程序的问题。在 iOS 和大多数 Android 设备上,它运行良好,但三星 Galaxy S3 和 S4 除外。
在第一个页面加载时,应用程序会创建一个本地 SQL 数据库。该数据库用于存储整个应用程序中问题和答案的值。
我在三星设备上遇到的问题是,在第一次运行应用程序时数据库无法正确加载,但是如果用户完全关闭应用程序并重新打开它,则数据库创建时不会出现错误。因为第一页要求用户输入他们的年龄,然后将值存储在 SQL 数据库中,所以用户会得到应用程序此时已卡住的印象。
数据库初始化代码:
index.html
document.addEventListener("deviceready", onDeviceReady, false);
function onDeviceReady() {
populateDB();
}
main_js.js
function populateDB() {
var db = window.openDatabase("Database", "1.0", "My Database", 20000);
db.transaction(populate_DB, errorCB, successCB);
}
function populate_DB(tx) {
tx.executeSql('CREATE TABLE IF NOT EXISTS Options (ID INTEGER UNIQUE NOT NULL, Name TEXT NOT NULL, Value INTEGER NOT NULL)');
tx.executeSql('CREATE TABLE IF NOT EXISTS Questions (ID INTEGER UNIQUE NOT NULL, Question TEXT NOT NULL, Answer TEXT)');
tx.executeSql('INSERT OR IGNORE INTO Options (ID, Name, Value) VALUES (1, "License", 0)');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (0, "Age","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (1, "two","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (2, "three","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (3, "four","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (4, "five","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (5, "six","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (6, "seven","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (7, "eigth","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (8, "nine","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (9, "ten","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (10, "eleven","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (11, "twelve","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (12, "thirteen","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (13, "fourteen","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (14, "fifteen","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (15, "sixteen","")');
tx.executeSql('INSERT OR IGNORE INTO Questions (ID, Question, Answer) VALUES (16, "seventeen","")');
}
age_button_pressed
function age_save() {
var db = window.openDatabase("Database", "1.0", "My Database", 20000);
loc = "q_sex.html";
db.transaction(age_query, errorCB);
}
function age_query(tx) {
var age = document.getElementById("a_age").value;
tx.executeSql('UPDATE Questions SET Answer = "' + age + '" WHERE ID="0";', [], q_querySuccess, errorCB);
}
age_button_pressed
之后,什么都没有发生,数据库也没有更新结果。
这只是三星Galaxy S3和S4的问题,我想知道三星的WebKit是否与它有关?
最佳答案
这可能是因为您打开了两次数据库。只需打开一次并在该单个实例上执行所有事务。还要确保您之前的交易已经完成,然后再开始另一笔交易。您不必担心这一点,但根据我的经验,Cordova 的 (PhoneGap) WebSQL 有点挑剔。
关于javascript - Android phonegap 应用程序在三星 Galaxy 设备上存在 SQlite 和本地存储问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20059195/