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@kwhinnery
Created July 1, 2010 21:35
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// Using the JavaScript module pattern, create a persistence module for CRUD operations
// One tutorial on the Module Pattern: http://www.adequatelygood.com/2010/3/JavaScript-Module-Pattern-In-Depth
var db = (function() {
//create an object which will be our public API
var api = {};
//maintain a database connection we can use
var conn = Titanium.Database.open('todos');
//Initialize the database
conn.execute('CREATE TABLE IF NOT EXISTS todos (id INTEGER PRIMARY KEY, todo TEXT)');
conn.execute('DELETE FROM todos'); //This will delete all data from our table - probably wouldn't do this in production ;)
//Create a TODO - db.create(todo)
api.create = function(text) {
conn.execute('INSERT INTO todos (todo) VALUES(?)',text);
return conn.lastInsertRowId; //return the primary key for the last insert
};
//List all TODOs - db.read()
api.all = function() {
var results = [];
//Get TODOs from database
var resultSet = conn.execute('SELECT * FROM todos');
while (resultSet.isValidRow()) {
results.push({
id: resultSet.fieldByName('id'),
todo: resultSet.fieldByName('todo')
});
resultSet.next();
}
resultSet.close();
return results; //return an array of JavaScript objects reflecting the todo
};
//Get a todo by a specific ID
api.get = function(id) {
var result = null;
var resultSet = conn.execute('SELECT * FROM todos WHERE id = ?', id);
if (resultSet.isValidRow()) {
result = {
id: resultSet.fieldByName("id"),
todo: resultSet.fieldByName("todo")
};
}
resultSet.close();
return result;
};
//Update an exisiting TODO - db.update(todo)
api.update = function(todoItem) {
conn.execute("UPDATE todos SET todo = ? WHERE id = ?", todoItem.todo, todoItem.id);
return conn.rowsAffected; //return the number of rows affected by the last query
};
//Delete a TODO - db.del(todo)
api.del = function(id) {
conn.execute("DELETE FROM todos WHERE id = ?", id);
return conn.rowsAffected; //return the number of rows affected by the last query
};
//return our public API
return api;
}());
// ****************************
// BEGIN DATABASE TEST EXAMPLES
// ****************************
// CREATE AND GET
var lastInsert = db.create("Pick up the milk"); // this should create a TODO
var ourTodo = db.get(lastInsert); //this should fetch the TODO we just created
Ti.API.info("Just created a TODO (Should be 'Pick up the milk'): "+ourTodo.todo);
// ALL
var anotherTodo = db.create("Conquer the world");
var all = db.all();
Ti.API.info("Records in database (Should be 2): "+all.length);
// UPDATE
ourTodo.todo = "Pick up Mountain Dew instead of milk";
var rowsAffected = db.update(ourTodo);
Ti.API.info("Rows affected (Should be 1): "+rowsAffected);
ourTodo = db.get(ourTodo.id);
Ti.API.info("Just got our updated record (Should be 'Pick up Mountain Dew instead of milk'): "+ourTodo.todo);
//DELETE
db.del(ourTodo.id);
var stillThere = db.get(ourTodo.id);
Ti.API.info("Just tried to get a record that aint there. Result should be null: "+stillThere);
@richardvenneman
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Thanks Kevin. Your example works as well but produces the same [WARN]ings in the console in Titanium Developer. This actually matters since the rest of the file won't be checked for errors.

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