Arduino - 将高分写入 SD 卡上的 SQLite 数据库

Question

EDIT 因为我找到的解决方案采用了不同的路径，所以我更新了标题以反映最终解决方案。最终解决方案允许轻松添加和删除条目或通过简单查询检索所需的条目数。最初的问题（下）是关于用 txt 文件解决问题。

我有一个 ESP32，目前可以将高分写入 EEPROM。

每个条目都包含一个名字和分数。

我想用 SD 卡替换这个可行的解决方案。我会在 SD 卡上有一个包含前 100 个分数的 txt 文件。一个文件将是这样的：

Player1          97.3     ROWCHECKSUM
Some player name 92.3     ROWCHECKSUM
Player1          91.2     ROWCHECKSUM
Player1          90.3     ROWCHECKSUM
Player2          87.1     ROWCHECKSUM
Player4 guy      77.3     ROWCHECKSUM
Player2          64.3     ROWCHECKSUM
Player1          61.1     ROWCHECKSUM
Player7          51.1     ROWCHECKSUM
.
.
.
Player9          21.1     ROWCHECKSUM

rowchecksum 将确保没有人手动更改文件。每次有新的高分时，我都必须更新 txt 文件。对此有什么好的方法？每次都删除文件重新生成？似乎要写很多数据只是为了删除最后一行并在适当的地方插入新的。

Answer 1

我通过将数据写入 SD 卡上的 sqlite 数据库解决了这个问题。这样我就可以简单地添加行，然后使用查询 return 前 10 名玩家。

根据评论中的要求进行更新。

我的table叫做highscores，它的结构是：

名称：字符串
分数：字符串
哈希：字符串

已 sha256(name + score + salt) 并确保没有人修改名称或分数。

#include <WiFi.h>
#include <WebServer.h>
#include <ArduinoJson.h>
#include <sqlite3.h>
#include <SPI.h>
#include <FS.h>
#include "SD.h"
#include "mbedtls/md.h"

#include "highscores.h"

[...]
WebServer server(80);
int rc;
sqlite3_stmt *res;
int rec_count = 0;
const char *tail;
sqlite3 *db1;
char *zErrMsg = 0;
File myFile;
[...]

void setup(void) {

 [...]
  server.on("/highscores", handleHighscores);
  server.on("/gethighscores", handleGetHighscores);

  sqlite3_initialize();
  if (openDb("/sd/mydb.db3", &db1))
    return;
 [...]
}

void loop(void) {
  server.handleClient();

 if (progStep == SAVEHIGHSCORE)
    {


      String tmp = shooter + rankingAvgScore + "fajlo5a5%9k";
      const char *payload = tmp.c_str();

      byte shaResult[32];

      mbedtls_md_context_t ctx;
      mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;
      const size_t payloadLength = strlen(payload);

      mbedtls_md_init(&ctx);
      mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 0);
      mbedtls_md_starts(&ctx);
      mbedtls_md_update(&ctx, (const unsigned char *) payload, payloadLength);
      mbedtls_md_finish(&ctx, shaResult);
      mbedtls_md_free(&ctx);

      String shastr;
      for (int i = 0; i < sizeof(shaResult); i++) {
        char str[3];
        sprintf(str, "%02x", (int)shaResult[i]);
        shastr = shastr + str;
      }

      String sql = "insert into highscores ('name','score','hash') values ('";
      sql += shooter;
      sql += "','";
      sql += rankingAvgScore;
      sql += "','";
      sql += shastr;
      sql += "')";
      
      rc = db_exec(db1, sql.c_str());

      sql = "Select * from highscores order by score desc limit 10";

      rc = sqlite3_prepare_v2(db1, sql.c_str(), 1000, &res, &tail);
      if (rc != SQLITE_OK) {
        String resp = "Failed to fetch data: ";
        resp += sqlite3_errmsg(db1);
        Serial.println(resp.c_str());
        return;
      }
      rec_count = 0;
      while (sqlite3_step(res) == SQLITE_ROW) {
        highscoreNames[rec_count] = (const char *) sqlite3_column_text(res, 1);
        highscoreScores[rec_count] = sqlite3_column_double(res, 2);
        highscoreHash[rec_count] = (const char *) sqlite3_column_text(res, 3);
        rec_count++;
      }
      sqlite3_finalize(res);
     
      progStep = END;

    }
}

这会根据要求发送网页。

void handleHighscores() {
  Serial.println("GET /");
  server.send(200, "text/html", htmlhighscores);
}

这会在网页请求时从数据库中读取值..

void handleGetHighscores()
{

  /* read highscores from sqlite db*/

  String sql = "Select * from highscores order by score desc limit 10";

  rc = sqlite3_prepare_v2(db1, sql.c_str(), 1000, &res, &tail);
  if (rc != SQLITE_OK) {
    String resp = "Failed to fetch data: ";
    resp += sqlite3_errmsg(db1);
    Serial.println(resp.c_str());
    return;
  }
  rec_count = 0;
  while (sqlite3_step(res) == SQLITE_ROW) {
    highscoreNames[rec_count] = (const char *) sqlite3_column_text(res, 1);
    highscoreScores[rec_count] = sqlite3_column_double(res, 2);
    highscoreHash[rec_count] = (const char *) sqlite3_column_text(res, 3);    
    rec_count++;
  }
  sqlite3_finalize(res);

  /* end read highschores from sqlite db*/

  StaticJsonDocument<2000> doc;
  JsonObject root = doc.to<JsonObject>();
  JsonObject values = root["highscores"].to<JsonObject>();

  //String highscoreNames[10];
  //double highscoreScores[10];

  for (int i = 0; i <= 9; i++) {
     String tmp = highscoreNames[i] + highscoreScores[i] + "fajlo5a5%9k";
      const char *payload = tmp.c_str();
      Serial.println(tmp);
      byte shaResult[32];

      mbedtls_md_context_t ctx;
      mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;
      const size_t payloadLength = strlen(payload);

      mbedtls_md_init(&ctx);
      mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 0);
      mbedtls_md_starts(&ctx);
      mbedtls_md_update(&ctx, (const unsigned char *) payload, payloadLength);
      mbedtls_md_finish(&ctx, shaResult);
      mbedtls_md_free(&ctx);

      String shastr;
      for (int i = 0; i < sizeof(shaResult); i++) {
        char str[3];
        sprintf(str, "%02x", (int)shaResult[i]);
        shastr = shastr + str;
      }
    String tmp2 = "name" + (String)(i+1);
    values[tmp2] = highscoreNames[i];
    tmp2 = "score" + (String)(i+1);
    values[tmp2] = highscoreScores[i];
    Serial.println(highscoreHash[i]);
    Serial.println(shastr);
    
    if ((highscoreHash[i] != shastr) && (highscoreScores[i] > 0))
    {
      values[tmp2] = (String)highscoreScores[i] + (String)" Hacked.. :D";
    }
      
  }
 
 
  Serial.println("Json SENT");
  Serial.println(highscoreScores[0]);
  String json;
  serializeJsonPretty(doc, json);
  //Serial.println(json);
  server.send(200, "text/plane", json);
}

highschores.h 文件

const char htmlhighscores[] PROGMEM = R"=====(
<html>
<style>
div.divshooter{
  text-align: center;
  font-size: 18px;
  font-weight: bold;  
}
div.minimalistBlack {
  border: 0px solid #000000;
  width: 100%;
  text-align: left;
  border-collapse: collapse;
}
.divTable.minimalistBlack .divTableCell, .divTable.minimalistBlack .divTableHead {
  border: 1px solid #000000;
  padding: 5px 4px;
}
.divTable.minimalistBlack .divTableBody .divTableCell {
  font-size: 13px;
}
.divTable.minimalistBlack .divTableHeading {
  background: #CFCFCF;
  background: -moz-linear-gradient(top, #dbdbdb 0%, #d3d3d3 66%, #CFCFCF 100%);
  background: -webkit-linear-gradient(top, #dbdbdb 0%, #d3d3d3 66%, #CFCFCF 100%);
  background: linear-gradient(to bottom, #dbdbdb 0%, #d3d3d3 66%, #CFCFCF 100%);
  border-bottom: 3px solid #000000;
}
.divTable.minimalistBlack .divTableHeading .divTableHead {
  font-size: 15px;
  font-weight: bold;
  color: #000000;
  text-align: left;
}
.minimalistBlack .tableFootStyle {
  font-size: 14px;
  font-weight: bold;
  color: #000000;
  border-top: 3px solid #000000;
}
.minimalistBlack .tableFootStyle {
  font-size: 14px;
}
/* DivTable.com */
.divTable{ display: table; }
.divTableRow { display: table-row; }
.divTableHeading { display: table-header-group;}
.divTableCell, .divTableHead { display: table-cell;}
.divTableHeading { display: table-header-group;}
.divTableFoot { display: table-footer-group;}
.divTableBody { display: table-row-group;}
</style>
<script>
function getData() {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      var jsonval = JSON.parse( this.responseText );
      
  
      document.getElementById("name1").innerHTML = jsonval.highscores["name1"];
      document.getElementById("score1").innerHTML = jsonval.highscores["score1"];
      document.getElementById("name2").innerHTML = jsonval.highscores["name2"];
      document.getElementById("score2").innerHTML = jsonval.highscores["score2"];
      document.getElementById("name3").innerHTML = jsonval.highscores["name3"];
      document.getElementById("score3").innerHTML = jsonval.highscores["score3"];
      document.getElementById("name4").innerHTML = jsonval.highscores["name4"];
      document.getElementById("score4").innerHTML = jsonval.highscores["score4"];
      document.getElementById("name5").innerHTML = jsonval.highscores["name5"];
      document.getElementById("score5").innerHTML = jsonval.highscores["score5"];
      document.getElementById("name6").innerHTML = jsonval.highscores["name6"];
      document.getElementById("score6").innerHTML = jsonval.highscores["score6"];
      document.getElementById("name7").innerHTML = jsonval.highscores["name7"];
      document.getElementById("score7").innerHTML = jsonval.highscores["score7"];
      document.getElementById("name8").innerHTML = jsonval.highscores["name8"];
      document.getElementById("score8").innerHTML = jsonval.highscores["score8"];
      document.getElementById("name9").innerHTML = jsonval.highscores["name9"];
      document.getElementById("score9").innerHTML = jsonval.highscores["score9"];
      document.getElementById("name10").innerHTML = jsonval.highscores["name10"];
      document.getElementById("score10").innerHTML = jsonval.highscores["score10"];

      console.log(this.responseText);
      
    }
  };
  xhttp.open("GET", "gethighscores", true);
  xhttp.send();
}


</script>
<body onload="getData();">
<h2>Highscores</h2>

<div class="divTable minimalistBlack">
<div class="divTableHeading">
<div class="divTableRow">
<div class="divTableHead">Rank</div>
<div class="divTableHead">Name</div>
<div class="divTableHead">Score</div>
</div>
</div>
<div class="divTableBody">

<div class = "divTableRow">
<div class = "divTableCell"><b><u>1</u></b></div>
<div class = "divTableCell" id="name1"></div>
<div class = "divTableCell" id="score1"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell"><b>2</b></div>
<div class = "divTableCell" id="name2"></div>
<div class = "divTableCell" id="score2"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell"><b>3</b></div>
<div class = "divTableCell" id="name3"></div>
<div class = "divTableCell" id="score3"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">4</div>
<div class = "divTableCell" id="name4"></div>
<div class = "divTableCell" id="score4"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">5</div>
<div class = "divTableCell" id="name5"></div>
<div class = "divTableCell" id="score5"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">6</div>
<div class = "divTableCell" id="name6"></div>
<div class = "divTableCell" id="score6"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">7</div>
<div class = "divTableCell" id="name7"></div>
<div class = "divTableCell" id="score7"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">8</div>
<div class = "divTableCell" id="name8"></div>
<div class = "divTableCell" id="score8"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">9</div>
<div class = "divTableCell" id="name9"></div>
<div class = "divTableCell" id="score9"></div>
</div>
<div class = "divTableRow">
<div class = "divTableCell">10</div>
<div class = "divTableCell" id="name10"></div>
<div class = "divTableCell" id="score10"></div>
</div>
</div>
</div>
</div>

</br></br>

<form action="/">
   <center> <input type="submit" value="Back to start" /></center>
</form>

</body>
</html>)=====";

Arduino - 将高分写入 SD 卡上的 SQLite 数据库

Arduino - write highscores to SQLite database on SD card

sqlite

android-sdcard

esp32

EDIT 因为我找到的解决方案采用了不同的路径，所以我更新了标题以反映最终解决方案。最终解决方案允许轻松添加和删除条目或通过简单查询检索所需的条目数。最初的问题（下）是关于用 txt 文件解决问题。