source: trunk/web/addons/job_monarch/lib/extjs/air/src/sql/Proxy.js @ 619

/*
 * Ext JS Library 0.30
 * Copyright(c) 2006-2009, Ext JS, LLC.
 * licensing@extjs.com
 * 
 * http://extjs.com/license
 */

/**
 * @class Ext.sql.Proxy
 * @extends Ext.data.DataProxy
 * An implementation of {@link Ext.data.DataProxy} that reads from a SQLLite
 * database.
 *
 * @constructor
 * @param {Object} conn an {@link Ext.sql.Connection} object
 * @param {String} table The name of the database table
 * @param {String} keyName The primary key of the table
 * @param {Ext.data.Store} store The datastore to bind to
 * @param {Boolean} readonly By default all changes to the store will be persisted
 * to the database. Set this to true to override to make the store readonly.
 */
Ext.sql.Proxy = function(conn, table, keyName, store, readonly){
    Ext.sql.Proxy.superclass.constructor.call(this);
    this.conn = conn;
    this.table = this.conn.getTable(table, keyName);
    this.store = store;

        if (readonly !== true) {
                this.store.on('add', this.onAdd, this);
                this.store.on('update', this.onUpdate, this);
                this.store.on('remove', this.onRemove, this);
        }
};

Ext.sql.Proxy.DATE_FORMAT = 'Y-m-d H:i:s';

Ext.extend(Ext.sql.Proxy, Ext.data.DataProxy, {
    load : function(params, reader, callback, scope, arg){
        if(!this.conn.isOpen()){ // assume that the connection is in the process of opening
                this.conn.on('open', function(){
                        this.load(params, reader, callback, scope, arg);
                }, this, {single:true});
                return;
        };
        if(this.fireEvent("beforeload", this, params, reader, callback, scope, arg) !== false){
                        var clause = params.where || '';
                        var args = params.args || [];
                        var group = params.groupBy;
                        var sort = params.sort;
                        var dir = params.dir;

                        if(group || sort){
                                clause += ' ORDER BY ';
                                if(group && group != sort){
                                        clause += group + ' ASC, ';
                                }
                                clause += sort + ' ' + (dir || 'ASC');
                        }

                        var rs = this.table.selectBy(clause, args);
                        this.onLoad({callback:callback, scope:scope, arg:arg, reader: reader}, rs);
        }else{
            callback.call(scope||this, null, arg, false);
        }
    },

    onLoad : function(trans, rs, e, stmt){
        if(rs === false){
                this.fireEvent("loadexception", this, null, trans.arg, e);
            trans.callback.call(trans.scope||window, null, trans.arg, false);
            return;
        }
        var result = trans.reader.readRecords(rs);
        this.fireEvent("load", this, rs, trans.arg);
        trans.callback.call(trans.scope||window, result, trans.arg, true);
    },

    processData : function(o){
        var fs = this.store.fields;
        var r = {};
        for(var key in o){
                var f = fs.key(key), v = o[key];
                        if(f){
                                if(f.type == 'date'){
                                        r[key] = v ? v.format(Ext.sql.Proxy.DATE_FORMAT,10) : '';
                                }else if(f.type == 'boolean'){
                                        r[key] = v ? 1 : 0;
                                }else{
                                        r[key] = v;
                                }
                        }
                }
                return r;
    },

    onUpdate : function(ds, record){
        var changes = record.getChanges();
        var kn = this.table.keyName;
        this.table.updateBy(this.processData(changes), kn + ' = ?', [record.data[kn]]);
        record.commit(true);
    },

    onAdd : function(ds, records, index){
        for(var i = 0, len = records.length; i < len; i++){
                this.table.insert(this.processData(records[i].data));
        }
    },

    onRemove : function(ds, record, index){
                var kn = this.table.keyName;
        this.table.removeBy(kn + ' = ?', [record.data[kn]]);
    }
});