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我使用Ionic/Cordova SQLite插件,我希望能够在调用特定函数之前检查数据库是否存在。如果我使用openDatabase("db", "", "name", dbSize, function() { };
,只有在没有数据库时才会调用它,但是如果我关闭Android应用并重新启动,openDatabase()
内的代码根本不会被调用。如果db已经创建,应该调用它吗?有没有另一种方法来检查数据库已经创建?检查SQLite数据库已创建
基本上,我需要调用一个函数后,我检查有一个数据库。
db = openDatabase("dbn", "", "manager", dbSize, function() {
console.log('is called'); // only shows when first creating db
// USER table create
db.transaction(function (tx) {
//tx.executeSql('DROP TABLE grips.db.user');
tx.executeSql('CREATE TABLE IF NOT EXISTS user (id integer primary key,active_user, firstname, lastname, email, age, gym_id integer, set_time integer, date_created integer)');
tx.executeSql('CREATE TABLE IF NOT EXISTS sets (id integer primary key,machine_name, device_id integer, weight_val integer, user integer,reps, exercise_id integer, workout_id, gym_id integer, calories,time_ago text, date_created integer)');
tx.executeSql('CREATE TABLE IF NOT EXISTS devices (id integer primary key,mac_id text, device_type,gym_id integer,machine_id integer,machine_name,date_created integer)');
tx.executeSql('CREATE TABLE IF NOT EXISTS workouts (id integer primary key,user integer,date_created integer)');
tx.executeSql('CREATE TABLE IF NOT EXISTS pt_workouts (id integer primary key, img_url, name, video_url, admin_user integer, gym_id integer, gif_url, search_img, instructions, trainer_name, user_img, date_created integer)');
}, function (error) {
}, function() {
});
}, function (error) {
console.log('open db second error');
},function() {
console.log('open db second');
});