www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/examples/tasks/db/ext-db.js
/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
// Asbtract base class for SqlDB classes
Ext.data.SqlDB = function(config){
Ext.apply(this, config);
Ext.data.SqlDB.superclass.constructor.call(this);
this.addEvents({
open : true,
close: true
});
};
Ext.extend(Ext.data.SqlDB, Ext.util.Observable, {
maxResults: 10000,
openState : false,
// abstract methods
open : function(file, cb, scope){
},
close : function(){
},
exec : function(sql, cb, scope){
},
execBy : function(sql, args, cb, scope){
},
query : function(sql, cb, scope){
},
queryBy : function(sql, args, cb, scope){
},
// protected/inherited method
isOpen : function(){
return this.openState;
},
getTable : function(name, keyName){
return new Ext.data.SqlDB.Table(this, name, keyName);
},
createTable : function(o){
var tableName = o.name;
var keyName = o.key;
var fs = o.fields;
var cb = o.callback;
var scope = o.scope;
if(!(fs instanceof Array)){ // Ext fields collection
fs = fs.items;
}
var buf = [];
for(var i = 0, len = fs.length; i < len; i++){
var f = fs[i], s = f.name;
switch(f.type){
case "int":
case "bool":
case "boolean":
s += ' INTEGER';
break;
case "float":
s += ' REAL';
break;
default:
s += ' TEXT';
}
if(f.allowNull === false || f.name == keyName){
s += ' NOT NULL';
}
if(f.name == keyName){
s += ' PRIMARY KEY';
}
if(f.unique === true){
s += ' UNIQUE';
}
buf[buf.length] = s;
}
var sql = ['CREATE TABLE IF NOT EXISTS ', tableName, ' (', buf.join(','), ')'].join('');
this.exec(sql, cb, scope);
}
});
Ext.data.SqlDB.getInstance = function(db, config){
if(window.htmlControl){ // air
return new Ext.data.AirDB(config);
} else { // gears
return new Ext.data.GearsDB(config);
}
};
Ext.data.SqlDB.Table = function(conn, name, keyName){
this.conn = conn;
this.name = name;
this.keyName = keyName;
};
Ext.data.SqlDB.Table.prototype = {
update : function(o, cb, scope){
var clause = this.keyName + " = :" + this.keyName;
this.updateBy(o, clause, {}, cb, scope);
},
updateBy : function(o, clause, args, cb, scope){
var sql = "UPDATE " + this.name + " set ";
var fs = [], a = [];
for(var key in o){
if(o.hasOwnProperty(key)){
fs[fs.length] = key + ' = ?';
a[a.length] = o[key];
}
}
for(var key in args){
if(args.hasOwnProperty(key)){
a[a.length] = args[key];
}
}
sql = [sql, fs.join(','), ' WHERE ', clause].join('');
this.conn.execBy(sql, a, cb, scope);
},
insert : function(o, cb, scope){
var sql = "INSERT into " + this.name + " ";
var fs = [], vs = [], a = [];
for(var key in o){
if(o.hasOwnProperty(key)){
fs[fs.length] = key;
vs[vs.length] = '?';
a[a.length] = o[key];
}
}
sql = [sql, '(', fs.join(','), ') VALUES (', vs.join(','), ')'].join('');
this.conn.execBy(sql, a, cb, scope);
},
select : function(clause, cb, scope){
this.selectBy(clause, null, cb, scope);
},
selectBy : function(clause, args, cb, scope){
var sql = "select * from " + this.name;
if(clause){
sql += ' ' + clause;
}
args = args || {};
this.conn.queryBy(sql, args, cb, scope);
},
remove : function(clause, cb, scope){
this.deleteBy(clause, null, cb, scope);
},
removeBy : function(clause, args, cb, scope){
var sql = "delete from " + this.name;
if(clause){
sql += ' where ' + clause;
}
args = args || {};
this.conn.execBy(sql, args, cb, scope);
}
};
Ext.data.SqlDB.Proxy = function(conn, table, keyName, store){
Ext.data.SqlDB.Proxy.superclass.constructor.call(this);
this.conn = conn;
this.table = this.conn.getTable(table, keyName);
this.store = store;
this.store.on('add', this.onAdd, this);
this.store.on('update', this.onUpdate, this);
this.store.on('remove', this.onRemove, this);
};
Ext.extend(Ext.data.SqlDB.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');
}
this.table.selectBy(clause, args,
this.onLoad.createDelegate(this, [{callback:callback, scope:scope, arg:arg, reader: reader}], 0));
}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('Y-m-d H:i:s') : '';
}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]]);
}
});