Created
June 27, 2012 09:09
-
-
Save bjjay/3002693 to your computer and use it in GitHub Desktop.
sqlite class
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
//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 | |
}) | |
}) | |
*/ |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment