1.iBoxDB 简介
http://www.iBoxdb.com/
2.选择原因
sqlite3不支持WebGL (更改业务逻辑,存到服务端有工作量,只能更改前端存储,webgl用iBoxDB,其它平台用sqlite3)
iBoxDB :JAVA C# Android Unity Xamarin Mono Nashorn Linux Windows
安装简单,unity只需要一个dll即可。
Web需要主动调用持久化(例如5分钟调用一次保存,或者当某个页面关闭时保存等等,根据开发者自定义,如果不保存,刷新浏览器 iBoxdb 将没有保存数据)。
Application.ExternalEval("FS.syncfs(false,function (err) {});");
3.简单用法
1.注意变量必须用 ?替代,防止sql注入。
Select("from Email where category == ? & type == ? order by created_at desc,id desc",1,1);
2.字段数据类型,必须一致。
Class{
int a;
long b;
}
Select("from Email where a == ? & b == ?",(long)1); //需要传long型
例如:
MysqL :where category = 1 AND type in (1,2,3,4) order by create_at desc,id desc limit 0,10
iBoxDb :
var types = new int[]{1,4};
转化后就是:from Email where category == ? & (type == ? | type == ? | type == ? | type == ?) order by create_at desc,10
private string MessageTypesToStrings(int length){ var result = ""; if (length == 0) return result; if (length > 1) { for (var i = 0; i < length - 1; i++) { result += "type==?" + "|"; } } result += "type==?"; return "(" + result + ")"; }
Select(sql,types); 数组这么传参不对,可以转化成 5个参数。
Select(sql,ConvertParams(1,types)); //ok
private object[] ConvertParams(params object[] parameters){ var list = new List<object> (); foreach (var item in parameters) { if (item.GetType () == typeof(int[])) { var items = item as int[]; foreach (var item1 in items) { list.Add ((int)item1); } } else if (item.GetType () == typeof(long[])) { var items = item as long[]; foreach (var item1 in items) { list.Add ((long)item1); } } else { list.Add (item); } } return list.ToArray (); }
4.group by 语法不支持
自己取出数据,然后用linq语句进行筛选。
var sums = from n in QueryData group n by new{n.category,n.type} into g select new {Total = g.Count ()};
from n in QueryData group n by new {n.category,n.type} into g select g.OrderByDescending (t => t.id).ThenByDescending (t => t.created_at).FirstOrDefault ()
大多数运算 都可以Select DataBase 然后进行 linq逻辑操作。
Select("from Email where (type == ?) & (reward_time > ? | life_time-?<=?)",1); //支持运算
4.我的helper类
public class iBoxDBHelper { private static iBoxDBHelper _ins; public static iBoxDBHelper ins{ get{ if (null == _ins) { _ins = new iBoxDBHelper (); } return _ins; } } public static string BoxDBEmail = "Email"; private string DBBoxDir{ get{ return Application.persistentDataPath; } } private AutoBox m_autoBox = null; private DB m_db; public AutoBox Box{ get{ return m_autoBox; } } public void InitDB(){ CreateDirectory (); if (null == m_autoBox) { DB.Root (DBBoxDir); m_db = new DB (3);//3=自定义数字,在这没有具体意义。 m_db.GetConfig ().EnsureTable<DBEmail> (BoxDBEmail,"id","category"); m_db.GetConfig ().EnsureIndex<DBEmail> (BoxDBEmail,"created_at","read_at"); m_autoBox = m_db.Open(); } } public void ChangeDB(){ m_db.Dispose (); m_autoBox = null; InitDB (); } private void CreateDirectory () { if(!Directory.Exists (DBBoxDir)) { Directory.CreateDirectory (DBBoxDir); } } public bool Insert(string tableName,DBEmail data){ return _ins.m_autoBox.Insert (tableName,data); } public void InsertMulti(string tableName,List<DBEmail> data){ using(var Box = _ins.m_autoBox.Cube()) { Binder binder = Box.Bind(tableName); foreach (var item in data) { binder.Insert (item); } Box.Commit (); } } public void Update(string tableName,object data){ _ins.m_autoBox.Update (tableName,data); } public void UpdateMulti(string tableName,List<object> data){ using(var Box = _ins.m_autoBox.Cube()) { Binder binder = Box.Bind(tableName); foreach (var item in data) { binder.Update (item); } Box.Commit(); } } public DBEmail GetOne(string sql,params object[] param){ var dbEmail = new DBEmail (); var datas = _ins.m_autoBox.Select <DBEmail> (sql,param); foreach (var item in datas) { dbEmail = item; } return dbEmail; } public void Delete(string tableName,string QL){ _ins.m_autoBox.Delete (tableName,QL); } }