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using FLY.OBJComponents.IService;
using FLY.Weight.IService;
using FObjBase;
using FObjBase.Reflect;
using SQLite;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace FLY.Weight.Server.Model
{
public class BulkDbMix<TDb>:IBulkDbMixService
where TDb : IDbBase, new()
{
DBTable<TDb> dbTable;
SQLiteHelper sqliteHelper;
Func<Lc_Mix, TDb> mapLc2Db;
Func<TDb, Lc_Mix> mapDb2Lc;
public long LastId { get; private set; }
public int Index { get; private set; }
public event PropertyChangedEventHandler PropertyChanged;
public BulkDbMix()
{
}
public void Init(DBTable<TDb> dbTable, int index,
Func<Lc_Mix, TDb> mapLc2Db, Func<TDb, Lc_Mix> mapDb2Lc)
{
this.Index = index;
this.dbTable = dbTable;
this.sqliteHelper = dbTable.sqliteHelper;
this.mapLc2Db = mapLc2Db;
this.mapDb2Lc = mapDb2Lc;
//获取最后一行数据
LastId = dbTable.MaxID;
}
public void Add(Lc_Mix lc)
{
//添加 数据库必要的 field
lc.ID = dbTable.FreeID;
lc.Idx = Index;
//SQLs
List<string> sqls = new List<string>();
sqls.Add(SQLiteHelper.GetInsertCommandText(mapLc2Db(lc)));
sqliteHelper.QueryTranAsync(sqls);
LastId = lc.ID;
}
public void AddRange(IEnumerable<Lc_Mix> lcs)
{
//SQLs
List<string> sqls = new List<string>();
foreach (var lc in lcs)
{
//添加 数据库必要的 field
lc.ID = dbTable.FreeID;
lc.Idx = Index;
sqls.Add(SQLiteHelper.GetInsertCommandText(mapLc2Db(lc)));
}
sqliteHelper.QueryTranAsync(sqls);
LastId = lcs.Last().ID;
}
public async void GetTrend(Pack_GetTrendRequest request, AsyncCBHandler asyncDelegate, object asyncContext)
{
Pack_GetTrendReponse<Lc_Mix> reponse = new Pack_GetTrendReponse<Lc_Mix>();
reponse.Request = request;
if (request.Count > 400)//数量限制，避免死机
request.Count = 400;
else if (request.Count < 1)
request.Count = 1;
if (request.Interval < 1)//避免 /0
request.Interval = 1;
await Task.Factory.StartNew(() =>
{
List<TDb> dbs = null;
if (!request.IsSearchByTime)
{
if (request.Id <= 0)
dbs = dbTable.Find(
$"WHERE (ID % {request.Interval} = 0)" +
$" AND (Idx = {Index})" +
$" ORDER BY ID DESC" +
$" LIMIT {request.Count} OFFSET {-request.Id}");
else
dbs = dbTable.Find(
$"WHERE (ID <= {request.Id})" +
$" AND (ID % {request.Interval} = 0)" +
$" AND (Idx = {Index})" +
$" ORDER BY ID DESC" +
$" LIMIT {request.Count}");
}
else
{
dbs = dbTable.Find(
$"WHERE ( Time <= {request.Time.ToStringOfSQLiteFieldType()})" +
$" AND ( ID % {request.Interval} = 0)" +
$" AND ( Idx = {Index})" +
$" ORDER BY ID DESC" +
$" LIMIT {request.Count}");
}
if (dbs.Count() == 0)
return;
//转为 Lc_Mix
List<Lc_Mix> lcMixs = new List<Lc_Mix>();
foreach (var db in dbs) {
lcMixs.Add(mapDb2Lc(db));
}
//从尾向前排的！！！！
reponse.Values = lcMixs;
});
asyncDelegate(asyncContext, reponse);
}
}
}