Question

我有一个简单的SQLite方法，它返回一个给定两个参数的类 - 类型T和要搜索的参数值

public T GetSingleObject<T>(string id) where T:IIdentity, new()
    {
        lock (dbLock)
        {
            using (var sqlCon = new SQLiteConnection(DBPath))
            {
                sqlCon.Execute(Constants.DBClauseSyncOff);
                sqlCon.BeginTransaction();
                string sql = string.Format("SELECT * FROM {0} WHERE id=\"{1}\"", GetName(typeof(T).ToString()), id);
                var data = sqlCon.Query<T>(sql);
                return data[0];
            }
        }
    }

我还有另一个方法，它有3个参数，T，要坐的参数和要搜索的值

public T GetSingleObject<T>(string para, string val) where T:IIdentity, new()
    {
        lock (dbLock)
        {
            using (var sqlCon = new SQLiteConnection(DBPath))
            {
                sqlCon.Execute(Constants.DBClauseSyncOff);
                sqlCon.BeginTransaction();
                string sql = string.Format("SELECT * FROM {0} WHERE {1}=\"{2}\"", GetName(typeof(T).ToString()), para, val);
                var data = sqlCon.Query<T>(sql).FirstOrDefault();
                return data;
            }
        }
    }

这些方法在没有问题的情况下工作并返回预期的值，但有一点需要注意 - 有一个表在手机有连接时工作正常，但在飞机模式下没有。该表中除了字符串，双精度，整数，DateTime和bool值之外没有其他内容。

GetName是一个简单的方法，可以删除程序集的位和部分，只留下类名

 private string GetName(string name)
    {
        var list = name.Split('.').ToList();
        if (list.Count == 1)
            return list[0];
        var last = list[list.Count - 1];
        return last;
    }

我已经尝试过各种方式来访问此表 - 包括直接

sqlCon.ExecuteScalar<MyClass>("SELECT * FROM MyClass");

并且没有离线，完美的在线数据。

该类本身看起来像这样

using System;
using System.Runtime.Serialization;
using System.Collections.Generic;
using SQLite;

namespace Models
{
public class MyClass : IIdentity
{
    [PrimaryKey]
    public string id { get; set; }

    public string home_id { get; set; }

    public string username { get; set; }

    public string password { get; set; }

    public string firstname { get; set; }

    public string lastname { get; set; }

    public string email { get; set; }

    public bool syncenabled { get; set; }

    public string tradingname { get; set; }

    public string address { get; set; }

    public string town { get; set; }

    public string state { get; set; }

    public string country { get; set; }

    public string securitystamp { get; set; }

    public string password_question { get; set; }

    public string password_answer { get; set; }

    public string mobileServiceAuthenticationToken { get; set; }

    public string providerUserKey { get; set; }

    public string mobiledeviceid { get; set; }

    public DateTime last_login { get; set; }

    public DateTime __createdAt { get; set; }

    public DateTime __updatedAt { get; set; }

    public string user_type { get; set; }

    public bool is_deleted { get; set; }

    public bool account_enabled { get; set; }

    public string subscription_id { get; set; }

    [IgnoreDataMember, Ignore]
    public List<MyUsers> UserModules { get { return AppDelegate.Self.DBManager.GetListOfObjects<MyUsers>("user_id", id); } }

    public override string ToString()
    {
        return string.Format("[MyClasss: id={0}, home_id={1}, username={2}, password={3}, firstname={4}, lastname={5}, email={6}, syncenabled={7}, tradingname={8}, address={9}, town={10}, state={11}, country={12}, securitystamp={13}, password_question={14}, password_answer={15}, mobileServiceAuthenticationToken={16}, providerUserKey={17}, mobiledeviceid={18}, last_login={19}, __createdAt={20}, __updatedAt={21}, user_type={22}, is_deleted={23}, account_enabled={24}, subscription_id={25}, UserModules={26}]", id, home_id, username, password, firstname, lastname, email, syncenabled, tradingname, address, town, state, country, securitystamp, password_question, password_answer, mobileServiceAuthenticationToken, providerUserKey, mobiledeviceid, last_login, __createdAt, __updatedAt, user_type, is_deleted, account_enabled, subscription_id, UserModules);
    }
}

我可以看到的任何内容都不会导致脱机时出现问题。查询始终在线下返回null，数据在线。

SQLite查询失败但仅在脱机时

0 个答案: