【发布时间】：2018-10-26 08:33:15
【问题描述】：
我在我的统一项目中实现了一个 SQLite 数据库，它在统一编辑器上运行良好。但是当我在 android 设备上运行它时，数据库操作行为很奇怪。
它有一个主菜单，用户可以从中选择 4 款游戏中的每一款来玩。 我正在计算用户在游戏上花费的总时间。所以我在每个游戏上添加了一个计时器，并将计时器计数推送到数据库中，然后当用户回击时，它会计算总时间的总和。
在 Unity 编辑器中，它在主菜单上完美地显示了最后添加的总时间。 但在 android 中，当用户返回主菜单时，总时间会停止。它不会在android上执行求和操作。
但是当我在同一场景中执行操作时，它也可以在 Android 上运行。
在为 android 编译 SQLite 时，我已正确完成所有操作。我已将我的数据库文件添加到 StreamingAssets 并添加了所有必要的插件。
这是我的代码和文件结构。
定时器.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Data;
using Mono.Data.Sqlite;
using UnityEngine.UI;
using System.IO;
public class Timer : MonoBehaviour {
public Text timerText;
private float startTime;
private string connectionString;
string minutes;
string seconds;
string a;
float t;
float DailyTime;
string CurrentDate;
// Use this for initialization
void Start () {
string filepath = Application.persistentDataPath + "/" + "trackerDB2.sqlite";
// // if it doesn't ->
// // open StreamingAssets directory and load the db ->
WWW loadDB = new WWW("jar:file://" + Application.dataPath + "!/assets/" + "trackerDB2.sqlite"); // this is the path to your StreamingAssets in android
while(!loadDB.isDone) {} // CAREFUL here, for safety reasons you shouldn't let this while loop unattended, place a timer and error check
// // then save to Application.persistentDataPath
File.WriteAllBytes(filepath, loadDB.bytes);
connectionString = "URI=file:" + filepath;
//connectionString = "URI=file:" + Application.dataPath + "/StreamingAssets/" + "trackerDB2.sqlite";
startTime = Time.time;
PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd"));
CurrentDate = PlayerPrefs.GetString("date_time");
}
// Update is called once per frame
void Update () {
t = Time.time - startTime;
//PlayerPrefs.SetFloat ("RowTime",t);
minutes = ((int)t / 60).ToString ();
seconds = (t % 60).ToString ("f0");
PlayerPrefs.SetString ("TimeKey", minutes + ":" + seconds);
timerText.text =PlayerPrefs.GetString("TimeKey");
a = minutes;
}
public void AddEvent(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("INSERT INTO events(date,timer_count) VALUES({0},{1})",System.DateTime.Now.ToString("yyyy-MM-dd"),t);
dbCmd.CommandText = sqlQuery;
dbCmd.ExecuteScalar();
dbConnection.Close();
}
}
PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd"));
Debug.Log(PlayerPrefs.GetString("date_time"));
}
public void GetSum(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("SELECT SUM(timer_count) FROM events WHERE date={0}",CurrentDate);
dbCmd.CommandText = sqlQuery;
using (IDataReader reader = dbCmd.ExecuteReader ()) {
while (reader.Read ()) {
DailyTime = reader.GetFloat (0);
}
dbConnection.Close();
reader.Close ();
}
}
}
}
public void AddDailyEvent(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("UPDATE daily_events SET timer_count={0} WHERE date={1}",DailyTime,CurrentDate);
dbCmd.CommandText = sqlQuery;
dbCmd.ExecuteScalar();
dbConnection.Close();
}
}
}
}
SetDateRow.cs
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Data;
using Mono.Data.Sqlite;
using UnityEngine.UI;
using System.IO;
public class SetDateRow : MonoBehaviour {
private string connectionString;
string SqliteDailyDate;
string SqliteEventsDate;
float TheTime;
string CurrentDate;
public Text DataText;
// Use this for initialization
void Start () {
string filepath = Application.persistentDataPath + "/" + "trackerDB2.sqlite";
// // if it doesn't ->
// // open StreamingAssets directory and load the db ->
WWW loadDB = new WWW("jar:file://" + Application.dataPath + "!/assets/" + "trackerDB2.sqlite"); // this is the path to your StreamingAssets in android
while(!loadDB.isDone) {} // CAREFUL here, for safety reasons you shouldn't let this while loop unattended, place a timer and error check
// // then save to Application.persistentDataPath
File.WriteAllBytes(filepath, loadDB.bytes);
connectionString = "URI=file:" + filepath;
//connectionString = "URI=file:" + Application.dataPath + "/StreamingAssets/" + "trackerDB2.sqlite";
AddEvent ();
AddFirstEvent ();
PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd"));
CurrentDate = PlayerPrefs.GetString("date_time");
}
// Update is called once per frame
void Update () {
// GetEvent ();
}
//Add new event with o timer at the start of the game
public void AddEvent(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("INSERT INTO events(date,timer_count) VALUES({0},0)",System.DateTime.Now.ToString("yyyy-MM-dd"));
dbCmd.CommandText = sqlQuery;
dbCmd.ExecuteScalar();
dbConnection.Close();
}
}
PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd"));
Debug.Log(PlayerPrefs.GetString("date_time"));
}
//get the last added date of events from daily events table which has the total sum of the time that user played each game
public void GetDateDailyEvents(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("SELECT date FROM daily_events ORDER BY eventID DESC LIMIT 1");
dbCmd.CommandText = sqlQuery;
using (IDataReader reader = dbCmd.ExecuteReader ()) {
while (reader.Read ()) {
SqliteDailyDate = reader.GetString (0);
}
dbConnection.Close();
reader.Close ();
}
}
}
}
//get the last added date from events table which has timer count of each event seperately
public void GetDateEvents(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("SELECT date FROM events ORDER BY event_id DESC LIMIT 1");
dbCmd.CommandText = sqlQuery;
using (IDataReader reader = dbCmd.ExecuteReader ()) {
while (reader.Read ()) {
SqliteEventsDate = reader.GetString (0);
}
dbConnection.Close();
reader.Close ();
}
}
}
}
public void AddFirstEvent(){
GetDateDailyEvents ();
GetDateEvents ();
Debug.Log ("daily" + SqliteDailyDate);
Debug.Log (SqliteEventsDate);
//check if the last date of events table is equal to the last date of daily events table.
if (SqliteDailyDate != SqliteEventsDate) {
using (IDbConnection dbConnection = new SqliteConnection (connectionString)) {
dbConnection.Open ();
//if not equal a new event to daily events table will be added
using (IDbCommand dbCmd = dbConnection.CreateCommand ()) {
string sqlQuery = String.Format ("INSERT INTO daily_events(date,timer_count) VALUES({0},0)", System.DateTime.Now.ToString ("yyyy-MM-dd"));
dbCmd.CommandText = sqlQuery;
dbCmd.ExecuteScalar ();
dbConnection.Close ();
}
}
}
PlayerPrefs.SetString("date_time", System.DateTime.Now.ToString("yyyy-MM-dd"));
Debug.Log(PlayerPrefs.GetString("date_time"));
}
public void ShowData(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("SELECT timer_count FROM daily_events WHERE date={0}",SqliteDailyDate);
dbCmd.CommandText = sqlQuery;
using (IDataReader reader = dbCmd.ExecuteReader ()) {
while (reader.Read ()) {
DataText.text = reader.GetFloat (0).ToString();
}
dbConnection.Close();
reader.Close ();
}
}
}
}
public void GetEvent(){
using (IDbConnection dbConnection = new SqliteConnection(connectionString)){
dbConnection.Open();
using(IDbCommand dbCmd = dbConnection.CreateCommand()){
string sqlQuery = String.Format("SELECT timer_count FROM daily_events WHERE date={0}",CurrentDate);
dbCmd.CommandText = sqlQuery;
using (IDataReader reader = dbCmd.ExecuteReader ()) {
while (reader.Read ()) {
DataText.text = reader.GetFloat (0).ToString();
}
dbConnection.Close();
reader.Close ();
}
}
}
}
}
请帮我解决这个问题。
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