05 building cross-platform mobile applications with jquery mobile / desarrollo de aplicaciones...
DESCRIPTION
Building cross-platform mobile applications with jQuery Mobile Desarrollo de Aplicaciones Cross-Platform para Dispositivos MovilesTRANSCRIPT
Desarrollo de Aplicaciones Cross-Platform para Dispositivos Moviles
Building Cross-Platform Mobile Applications
M.S.C. Raquel Vásquez Ramírez M.S.C. Cristian A. Rodríguez Enríquez
Contenido
• Manejo de Base de Datos (Client Side) • Almacenamiento Local – Permanente – Sesión – Usando Base de Datos
• Conclusiones
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HTML 5: Data Storage
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HTML5 offers two types of data storage on the client: • Storage via a database containing the tables
described in SQL • Storage through localStorage and sessionStorage
objects, to store information made up of strings.
Permanent Storage and Session Storage
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Para habilitar el “Storage” se utilizan dos objetos de JavaScript: • localStorage: Permite el almacenamiento permanente • sessionStorage: Permite el almacenamiento en la sesión
Permanent Storage
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localStorage.lname = “Sarrion”; localStorage.fname = “Eric”;
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Session Storage
sessionStorage.lname = “Sarrion”; sessionStorage.fname = “Eric”;
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Usando una Base de Datos
Como se puede observar el almacenamiento temporal y permanente no provee las facilidades de las bases de datos SQL. Gracias a HTML 5 es posible usar bases de SQL de forma local.
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Creando la Base de Datos
var db = openDatabase (“Test”, “1.0”, “Test”, 65535);
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Transaction
db.transacKon (funcKon (transacKon) { var sql = SQL query; transacKon.executeSql (sql, [parameters] / undefined, funcKon () { // JavaScript code to execute if the query was successful }, funcKon () { // JavaScript code to execute if the query failed } ); });
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Usando la Base de Datos
• Crear Base de Datos • Insertar • Listar (SELECT) • Eliminar Tabla
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CREATE TABLE
db.transacKon (funcKon (transacKon) { var sql = "CREATE TABLE customers " + " (id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, " + "lname VARCHAR(100) NOT NULL, " + "fname VARCHAR(100) NOT NULL)" transacKon.executeSql (sql, undefined, funcKon () { alert ("Table created"); }, error); });
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DROP TABLE
db.transacKon (funcKon (transacKon) { var sql = "DROP TABLE customers"; transacKon.executeSql (sql, undefined, ok, error); }
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INSERT INTO
db.transacKon (funcKon (transacKon) { var sql = "INSERT INTO customers (lname, fname) VALUES (?, ?)"; transacKon.executeSql (sql, [lname, fname], funcKon () { alert ("Customer inserted"); }, error); }
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Base de Datos Server Side (Elementos)
var sql = "SELECT * FROM customers"; transacKon.executeSql (sql, undefined,…
Conclusiones
• jQuery provee los elementos necesarios para desarrollar aplicaciones para dispositivos móviles
• Desarrollo Ágil • Si se desea sincronizar datos con un servidor, se
requiere usar una base de datos local y sincronizar cuando se disponga de conexión mediante una consulta constante del estado de la conexión (Push?)
• Optimización de Aplicaciones Web
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