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orm.js
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orm.js
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/***************************************************************************
*
* ORM-HTML5 LGPL License
* Copyright JM Robles 2010 <roblesjm at gmail dot com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
**************************************************************************/
function DBM(dbName, dbVersion){
this._isInit = false;
this.dbName = dbName;
if (dbVersion === undefined) {
this.dbVersion = "1.0";
}
else {
this.dbVersion = dbVersion;
}
//
this.init = function(){
if (!window.openDatabase) {
throw "no Web SQL support. Please use the last Google Chrome or Webkit engine";
}
// Create database
db = window.openDatabase(this.dbName, this.dbVersion, this.dbName, 10 * 1024 * 1024);
if (db == null || db == undefined) {
throw "can't create database";
}
this.db = db;
}
this.init();
// Register models
this.registerModel = function(model,cb){
try {
eval("var o = new " + model + "({db: this,ddl:'ddl'})");
}
catch (err) {
throw "invalid model " + model + " - " + err;
}
// Create SQL DDL sentence
var def = "";
for (var i = 0; i < o._sqlFields.length; i++) {
var f = o._sqlFields[i];
var partial = f.field;
// Type
switch (f.type) {
case "s":{
partial += " varchar(255)";
break;
}
case "i":{
partial += " integer ";
break;
}
case "f":{
partial += " float ";
break;
}
case "o":{
partial += " integer ";
break;
}
case "r":{
partial += " blob ";
break;
}
case "b":{
partial += " boolean ";
break;
}
case "d":{
partial += " datetime ";
break;
}
default:
throw "not implemented DDL for : " + f.type;
}
// Flags
if (f.flags.indexOf("n") != -1) {
partial += " not null ";
}
if (f.flags.indexOf("u") != -1) {
partial += " unique ";
}
def += ", " + partial;
}
var cons = "CREATE TABLE IF NOT EXISTS " + o.tablename + " (id integer primary key " + def + " ,flush int(2) not null default 1)";
this.execute(cons, [], function (tx,rs){
// Predata?
if (o.predata != undefined && o.predata.length > 0) {
o._loadPredata(cb);
}
else {
if (cb != undefined) {
cb(o.tablename);
}
}
}, function(tx, err){
throw "error creating table with DDL " + cons;
});
}
this.register = function(aModels,cb){
if ( aModels.length == 0)
{
if (cb != undefined)
cb();
}
else{
var m = aModels.shift();
//console.log('register: '+ m);
var ref = this;
this.registerModel(m,function (model){
//console.log('register end '+m);
ref.register(aModels,cb);
});
}
}
this.execute = function(sql, params, cbOk, cbErr){
cbOk = cbOk ||
function(tx, rs){
};
cbErr = cbErr ||
function(tx, err){
};
this.db.transaction(function(tx){
tx.executeSql(sql, params, cbOk, cbErr);
});
}
this._exportData = function(mode, model){
if (model == undefined) {
// Exportar todo
return;
}
try {
eval("var o = new " + model + "({db: this,ddl:'ddl'})");
}
catch (err) {
throw "invalid model " + model + " - " + err;
}
var cons = "SELECT * FROM " + o.tablename;
this.execute(cons, [], function(tx, rs){
if (mode == 'json') {
var resp = 'data_' + o.tablename + ' = [ ';
var partial = "";
for (var i = 0; i < rs.rows.length; i++) {
partial += "{"
var item = rs.rows.item(i);
var extra = "";
for (var k in item) {
var val = "";
if (typeof(item[k]) == "number") {
val = item[k];
}
else
if (typeof(item[k]) == "string") {
val = "'" + item[k] + "'";
}
else
if (item[k] == null) {
val = "null";
}
partial += extra + k + " : " + val;
extra = ", ";
}
partial += "},";
}
resp += partial + " ];";
alert("allow POPUP!");
WinId = window.open('', 'newwin', 'width=400,height=500');
WinId.document.open();
WinId.document.write(resp);
WinId.document.close();
}
}, null);
}
this.exportDataAsJSON = function(model){
this._exportData('json', model);
}
}
/*********************
*
* ModelBase is an "abstract" class. Every model in the system need to use in its constructor.
* Example:
*
* function Client() {
* this.base = new ModelBase()
* this.base(tablename);
*
* // Here we define the fields type. With this structure, the base class create the necessary SQL.
* // Syntax is simple:
* // ('s' | 'f' | 'i' | 'd' | 'b' )['u']['n']<name (with the fist letter as capital)>
* // or
* // o['u']['n']<name (with the fist letter as capital)>:<table referenced>
*
* this.fields = [ 'snName' , 'inAge' , 'suID', 'fWeight' , 'oCity:City ];
* this.init();
*
*
* }
*
*/
function ModelBase(tablename){
this.tablename = tablename;
this.id = -1;
// "Private"
// utils
// Utils
this._isLower = function(ch){
var lowers;
lowers = "abcdefghijklmnopqrstuvwxyz";
return (lowers.indexOf(ch) != -1);
}
this._isUpper = function(ch){
var uppers;
uppers = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
return (uppers.indexOf(ch) != -1);
}
this._parseFields = function(){
// Reset
this._sqlFields = [];
for (i in this.fields) {
var f = this.fields[i];
// Obtener el tipo
var t = this._getTypeName(f);
if (t == null) {
throw "invalid specficacion: " + f;
}
if (t.type != "i" && t.type != "s" && t.type != "f" && t.type != "o" && t.type != "d" && t.type != "b" && t.type != "r") {
throw "no type found for: " + f;
}
this._sqlFields.push(t);
}
}
this._getTypeName = function(f){
var i = 0;
var p = 0;
while (i < f.length && this._isLower(f[i])) {
i++;
}
// Check flags
var flag = "";
var r = "";
if (f.substring(0, i).length > 1) {
flag = f.substring(1, i);
}
var t = f.substring(0, 1);
var n = "";
// Es un objeto?
if (t == "o") {
var sep = f.substring(i).indexOf(":");
if (sep == -1) {
throw "no reference model for: " + f.substring(i);
}
r = f.substring(i + sep + 1);
n = f.substring(i, i + sep).toLowerCase();
}
else {
n = f.substring(i).toLowerCase();
}
// Check flags
for (var k = 0; k < flag.length; k++) {
if ("nu".indexOf(flag[k]) == -1) {
throw "invalid flag " + flag[k];
}
}
if (i < f.length) {
return {
type: t,
field: n,
flags: flag,
ref: r
};
}
return null;
}
this._reflection = function(){
for (i in this._sqlFields) {
var t = this._sqlFields[i];
// Getter y Setter
eval("this.__defineGetter__(t.field,function() { return this._handlerGet('" + t.field + "','" + t.type + "','" + t.ref + "'); })");
eval("this.__defineSetter__(t.field,function(value) { this._handlerSet('" + t.field + "','" + t.type + "','" + t.flags + "','" + t.ref + "',value); })");
}
}
this._handlerGet = function(field, type, ref){
if (type == "o") {
// Creamos un objet del tipo y lo devolvemos
/*try {
eval("var val = this._m_" + field);
}
catch (err) {
var val = null;
}
if (val == undefined || val == null) {
return null;
}
if (val.id != -1)
{
return val;
}
eval("var ret = new " + ref + "(this.db)");
ret.get(val);
return ret;
*/
return this._get_proxy(field,ref);
}
eval("var ret = this._m_" + field);
if (ret == undefined || ret == null) {
return ret;
}
if (type == "b") {
return ret != 0 ? true : false;
}
else
if (type == "d") {
return new Date(ret);
}
return ret;
}
this._handlerSet = function(field, type, flags, ref, value){
// Comprobar tipo
if (type == "o") {
if ( flags.indexOf("n") != -1 && value == null )
{
throw "not null field";
}
if (value != null) {
// Check type
eval("var test = value instanceof " + ref);
if (!test)
throw "no type " + ref;
// Comprobar si tiene ID
if (value.id == -1) {
throw "need save object before";
}
eval("this._m_"+field+" = new ModelProxy(this.db,value.id,ref)");
eval("this._m_"+field+".set(value)");
}
else
{
eval("this._m_"+field+" = new ModelProxy(this.db,-1,ref)");
}
/*if (flags.indexOf("n") != -1) {
eval("var test = value instanceof " + ref);
if (!test)
throw "no type " + ref;
// Comprobar si tiene ID
if (value.id == -1) {
throw "need save object before";
}
value = value;
}
else {
value = value || null;
}
*/
}
else
if (type == "d") {
if (!(value instanceof Date)) {
throw "Date object required";
}
}
else
if (type == "b" && typeof(value) != "boolean") {
throw "excepted boolean value";
}
else
if (type == "b") {
value = (value ? 1 : 0);
}
if (typeof(value) == "number" && type == "s") {
throw "number given, excepted string: " + field;
}
else
if (typeof(value) == "string" && type != "s" && type != "r") {
throw "string given, excepted number: " + field;
}
if (type=="o") {
if ( value == null)
{
value = null;
}
else{
value = value.id;
}
}
else {
eval("this._m_" + field + " = value");
}
// AutoUpdate
if (this.id != -1) {
// Realizar update
if (type == "s" || type == "r" || type == "d") {
value = "'" + value + "'";
}
var cons = "UPDATE " + this.tablename + " SET " + field + " = " + value + ", flush = 1 WHERE id = " + this.id;
this.db.execute(cons, [], function(tx, res){
}, function(tx, err){
});
}
}
this._getFieldsStr = function(){
var fields = "";
if (this._sqlFields == null || this._sqlFields.length == 0)
return null;
fields = this._sqlFields[0].field;
for (var i = 1; i < this._sqlFields.length; i++) {
fields += "," + this._sqlFields[i].field;
}
return fields;
}
this._getValuesStr = function(){
var partial = "";
for (var i = 0; i < this._sqlFields.length; i++) {
// Comprobar flags
if (this._sqlFields[i].flags.indexOf("n") == -1) {
partial += this._getPartialValueStr(this._sqlFields[i]);
continue;
}
// Por ahora solo hay "not null"
eval("var val = this._m_" + this._sqlFields[i].field);
if (val == undefined) {
return {
status: false,
msg: "field '" + this._sqlFields[i].field + "' is required"
};
}
partial += this._getPartialValueStr(this._sqlFields[i]);
}
return {
status: true,
sql: partial
};
}
this._getPartialValueStr = function(f){
eval("var val = this._m_" + f.field);
if (val == undefined) {
return ",null";
}
if (f.type == "i" ) {
eval("var ret = ',' + this._m_" + f.field);
return ret;
}
else if (f.type == "o")
{
//eval("var ret = ',' + this._m_" + f.field+".id");
var t = this._get_proxy(f.field,f.ref);
var r = t._get();
return r == null ? ",null" : (","+r.id);
}
else
if (f.type == "b") {
eval("var ret = (this._m_" + f.field + " ? 1 :0)");
}
else {
eval("var ret = ',\"' + this._m_" + f.field + "+ '\"'");
return ret;
}
}
this._loadPredata = function(cb){
if (this.predata.length == 0)
return;
for (var i = 0; i < this.predata.length; i++) {
var values = "";
var keys = "";
var id = "";
var flush = 0;
for (var j in this.predata[i]) {
if (j == 'id') {
id = this.predata[i][j];
continue;
}
if (j == 'flush') {
flush = this.predata[i][j];
continue;
}
var found = false;
for (var k in this._sqlFields) {
if (this._sqlFields[k].field == j) {
found = true;
break;
}
}
if (!found) {
throw "predata not field found: " + j;
}
keys += "," + j;
if (typeof(this.predata[i][j]) == "string") {
values += ",'" + this.predata[i][j] + "'";
}
else
if (typeof(this.predata[i][j]) == "boolean") {
values += "," + (this.predata[i][j] ? 1 : 0);
}
else {
values += "," + this.predata[i][j];
}
}
if (id == "") {
throw "no id given";
}
var cons = "INSERT OR IGNORE INTO " + this.tablename + "(id" + keys + ",flush)" + " VALUES (" + id + values + "," + flush + ")";
var ref = this;
var num = 0;
this.db.execute(cons, [], function(tx,rs){
num++;
if (num == ref.predata.length)
{
if (cb != undefined) {
cb(ref.tablename);
}
}
}, null);
}
}
// Public
// Initialize an instance
this.init = function(data){
if (data == undefined) {
throw "not db specified";
}
if (data instanceof DBM) {
var db = data;
var ddl = undefined;
}
else {
var db = data.db;
var ddl = data.ddl;
}
this.db = db;
this._parseFields();
if (ddl != undefined && ddl == "ddl") {
// Invocated by model register
// Predata?
/*
if (this.predata != undefined) {
this._loadPredata();
}
*/
return;
}
this._reflection();
}
// Save
this.save = function(cb){
var ref = this;
var cb = cb || null;
// INSERT
var fields = this._getFieldsStr();
var vFields = this._getValuesStr();
if (!vFields.status) {
return vFields;
}
// -- Construir la llamada
var id = "null";
if(this.id != -1)
id = this.id
var cons = "INSERT OR REPLACE INTO " + this.tablename + " (id," + fields + ",flush) VALUES (" + id + vFields.sql + ",1);";
//alert(cons);
this.db.execute(cons, [], function(tx, rs){
// Establecer el ID
ref.db.execute("SELECT id FROM " + ref.tablename + " WHERE rowid = ?", [rs.insertId], function(tx, rs){
// Establecer el ID
ref.id = rs.rows.item(0).id;
if (cb) {
cb(ref);
}
}, function(tx, err){
});
}, function(tx, err){
throw "error save: " + err.message;
});
}
this.get = function(arg, cb){
var fields = "";
fields = this._getFieldsStr();
var cons = "SELECT id," + fields + " FROM " + this.tablename + " WHERE id = ?";
var ref = this;
this.db.execute(cons, [arg], function(tx, rs){
if (rs.rows.length == 0) {
return;
}
else {
ref.id = rs.rows.item(0)['id'];
// Establecer los datos
for (var i = 0; i < ref._sqlFields.length; i++) {
eval("ref._m_" + ref._sqlFields[i].field + " = rs.rows.item(0)[ref._sqlFields[i].field]");
}
if (cb != undefined) {
cb(ref);
}
}
}, function(tx, err){
});
}
this.all = function(cb){
this.filter({
id__gt: 0
}, cb);
}
this.filter = function(c, cb){
var where = "";
var isFirst = true;
if (typeof(c) == "string") {
where = c;
}
else {
for (k in c) {
// Split por campos
var p = k.lastIndexOf("__");
var flag = "";
var field = "";
var partial = "";
if (p != -1) {
field = k.substring(0, p);
flag = k.substring(p + 2);
}
else {
field = k;
}
// Comprobar que existe el campo
if (!this.hasOwnProperty(field)) {
throw "no field: " + field;
}
var tmpAr = this._sqlFields.slice(0);
if (field == 'id') {
tmpAr.push({
field: 'id',
type: 'i',
flags: 'n',
rel: ''
});
}
// Comprobar si los tipos coinciden
for (var i = 0; i < tmpAr.length; i++) {
if (tmpAr[i].field == field) {
if (typeof(c[k]) == "string" && tmpAr[i].type != "s") {
throw "invalid value type of " + c[k] + " for " + field;
}
else
if (typeof(c[k]) == "boolean" && tmpAr[i].type != "b") {
throw "invalid value type of " + c[k] + " for " + field + " - excepted boolean";
}
else
if (typeof(c[k]) == "number" && tmpAr[i].type == "s") {
throw "invalid value type of " + c[k] + " for " + field;
}
else
if (typeof(c[k]) == "object" && tmpAr[i].type != "o") {
// TODO: check the exact model instance
throw "invalid value type of " + c[k] + " for " + field + "- excpeted object model";
}
else
if (tmpAr[i].type == 'd' && !(c[k] instanceof Date)) {
throw "invalid value type of " + c[k] + " for " + field + "- excepted Date object";
}
// ¿flags de comparacion?
if (flag != "") {
// Números
if (typeof(c[k]) == "number" && flag != "eq" && flag != "gt" && flag != "lt" && flag != "le" && flag != "ge" && flag != "ne") {
throw "invalid operator " + flag + " for number";
}
switch (flag) {
case 'gt':{
partial = field + " > " + c[k];
break;
}
case 'lt':{
partial = field + " < " + c[k];
break;
}
case 'eq':{
partial = field + " = " + c[k];
break;
}
case 'ne':{
partial = field + " <> " + c[k];
break;
}
case 'ge':{
partial = field + " >= " + c[k];
break;
}
case 'le':{
partial = field + " <= " + c[k];
break;
}
}
}
else
if (typeof(c[k]) == "boolean") {
partial = field + " = " + (c[k] ? 1 : 0);
}
else
if (c[k] instanceof Date) {
// TODO: estudio de flags
partial = field + " = '" + c[k] + "'";
}
else
if (typeof(c[k]) == "object") {
if (!c[k].hasOwnProperty('id')) {
throw "not a valid object";
}
partial = field + " = " + c[k].id;
}
else {
if (typeof(c[k]) == "string") {
if (c[k].indexOf("%") != -1) {
partial = field + " like '" + c[k] + "'";
}
else {
partial = field + " = '" + c[k] + "'";
}
}
else {
partial = field + " = " + c[k];
}
}
break;
}
}// for sqlfields
if (isFirst) {
isFirst = false;
where = partial;
}
else {
where += " AND " + partial;
}
}// for keys
if (isFirst) {
throw "no filter options";
}
}
// Composicion de consulta
var cons = "SELECT * FROM " + this.tablename + " WHERE " + where;
var ref = this;
this.db.execute(cons, [], function(tx, rs){
var objs = [];
for (var i = 0; i < rs.rows.length; i++) {
var obj = new ref.constructor(ref.db);
// Establecer propiedades
// ID
obj.id = rs.rows.item(i).id;
// Resto de propiedades
for (var j = 0; j < ref._sqlFields.length; j++) {
eval("obj._m_" + ref._sqlFields[j].field + " = rs.rows.item(i)[ref._sqlFields[j].field]");
}
objs.push(obj);
}
// Invocar al callback
if (cb) {
cb(objs);
}
}, function(tx, err){
});
}
this.del = function(cb){
if (this.id == -1) {
throw "object no registered in database";
}
this.db.execute("DELETE FROM " + this.tablename + " WHERE id = ?", [this.id], function(tx, rs){
if (cb) {
if (rs.rowsAffected == 1) {
cb(true);
}
else {
cb(false);
}
}