sqlite操作类，支持链式操作代码,Css代码库,德仔网

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【Css】 sqlite操作类，支持链式操作
作者:Dezai.CN / 发布于2013/7/30/ 930

	//copyright by lanxyou lanxyou[at]gmail.com
	var lanxDB=function(dbname){
	 var db=openDatabase(dbname,'1.0.0','',65536);
	 return{
	 //返回数据库名
	 getDBName:function(){
	 return dbname;
	 },
	 //初始化数据库，如果需要则创建表
	 init:function(tableName,colums){
	 this.switchTable(tableName);
	 colums.length>0?this.createTable(colums):'';
	 return this;
	 },
	 //创建表，colums:[name:字段名,type:字段类型]
	 createTable:function(colums){
	 var sql="CREATE TABLE IF NOT EXISTS " + this._table ;
	 var t;
	 if (colums instanceof Array && colums.length>0){
	 t=[];
	 for (var i in colums){
	 t.push(colums[i].name+' '+colums[i].type);
	 }
	 t=t.join(', ');
	 }else if(typeof colums=="object"){
	 t+=colums.name+' '+colums.type;
	 }
	 sql=sql+" ("+t+")";
	 var that=this;
	 db.transaction(function (t) {
	 t.executeSql(sql) ;
	 })
	 },
	 //切换表
	 switchTable:function(tableName){
	 this._table=tableName;
	 return this;
	 },
	 //插入数据并执行回调函数，支持批量插入
	 //data为Array类型，每一组值均为Object类型，每一个Obejct的属性应为表的字段名，对应要保存的值
	 insertData:function(data,callback){
	 var that=this;
	 var sql="INSERT INTO "+this._table;
	 if (data instanceof Array && data.length>0){
	 var cols=[],qs=[];
	 for (var i in data[0]){
	 cols.push(i);
	 qs.push('?');
	 }
	 sql+=" ("+cols.join(',')+") Values ("+qs.join(',')+")";
	 }else{
	 return false;
	 }
	 var p=[],
	 d=data,
	 pLenth=0,
	 r=[];
	 for (var i=0,dLength=d.length;i<dLength;i++){
	 var k=[];
	 for (var j in d[i]){
	 k.push(d[i][j]);
	 }
	 p.push(k);
	 }
	 var queue=function(b,result){
	 if (result){
	 r.push(result.insertId ||result.rowsAffected);
	 }
	 if (p.length>0){
	 db.transaction(function (t) {
	 t.executeSql(sql,p.shift(),queue,that.onfail);
	 })
	 }else{
	 if (callback){
	 callback.call(this,r);
	 }
	 }
	 }
	 queue();
	 },
	 _where:'',
	 //where语句，支持自写和以对象属性值对的形式
	 where:function(where){
	 if (typeof where==='object'){
	 var j=this.toArray(where);
	 this._where=j.join(' and ');
	 }else if (typeof where==='string'){
	 this._where=where;
	 }
	 return this;
	 },
	 //更新数据，data为属性值对形式
	 updateData:function(data,callback){
	 var that=this;
	 var sql="Update "+this._table;
	 data=this.toArray(data).join(',');
	 sql+=" Set "+data+" where "+this._where;
	 this.doQuery(sql,callback);
	 },
	 //根据条件保存数据，如果存在则更新，不存在则插入数据
	 saveData:function(data,callback){
	 var sql="Select * from "+this._table+" where "+this._where;
	 var that=this;
	 this.doQuery(sql,function(r){
	 if (r.length>0){
	 that.updateData(data,callback);
	 }else{
	 that.insertData([data],callback);
	 }
	 });
	 },
	 //获取数据
	 getData:function(callback){
	 var that=this;
	 var sql="Select * from "+that._table;
	 that._where.length>0?sql+=" where "+that._where:"";
	 that.doQuery(sql,callback);
	 },
	 //查询，内部方法
	 doQuery:function(sql,callback){
	 var that=this;
	 var a=[];
	 var bb=function(b,result){
	 if (result.rows.length){
	 for (var i=0;i<result.rows.length;i++){
	 a.push(result.rows.item(i));
	 }
	 }else{
	 a.push(result.rowsAffected);
	 }
	 if (callback){
	 callback.call(that,a);
	 }
	 }
	 db.transaction(function (t) {
	 t.executeSql(sql,[],bb,that.onfail) ;
	 })
	 },
	 //根据条件删除数据
	 deleteData:function(callback){
	 var that=this;
	 var sql="delete from "+that._table;
	 that._where.length>0?sql+=" where "+that._where:'';
	 that.doQuery(sql,callback);
	 },
	 //删除表
	 dropTable:function(){
	 var sql="DROP TABLE IF EXISTS "+this._table;
	 this.doQuery(sql);
	 },
	 _error:'',
	 onfail:function(t,e){
	 this._error=e.message;
	 console.log('----sqlite:'+e.message);
	 },
	 toArray:function(obj){
	 var t=[];
	 obj=obj || {};
	 if (obj){
	 for (var i in obj){
	 t.push(i+"='"+obj[i]+"'");
	 }
	 }
	 return t;
	 }
	 }
	}

	/*
	examples:
	var db=new lanxDB('testDB');
	db.init('channel_list',[{name:'id',type:'integer primary key autoincrement'},{name:'name',type:'text'},{name:'link',type:'text'},{name:'cover',type:'text'},{name:'updatetime',type:'integer'},{name:'orders',type:'integer'}]);
	db.init('feed_list',[{name:'parentid',type:'integer'},{name:'feed',type:'text'}]);
	db.switchTable('channel_list').insertData([{name:'aa',link:'ss',updatetime:new Date().getTime()},{name:'bb',link:'kk',updatetime:new Date().getTime()}]);
	db.where({name:'aa'}).getData(function(result){
	 console.log(result);//result为Array
	});
	db.where({name:'aa'}).deleteData(function(result){
	 console.log(result[0]);//删除条数
	});
	db.where({name:'bb'}).saveData({link:'jj'},function(result){
	 console.log(result);//影响条数
	})
	})
	*/
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