如何解决使用ESP8266WiFi芯片连接到MySQL数据库
我试图直接从arduino连接到远程MysqL数据库,以便对某些硬件进行遥测。但是,代码在连接到数据库时会卡住,并始终给出“找不到数据库”的答案。我在哪里错了?
我确定我对用户/密码正确,但是我真的不知道为什么它不会连接到数据库来执行查询。
#include <ESP8266WiFi.h>
#include <MysqL_Connection.h>
#include <MysqL_Cursor.h>
char ssid[] = "mywifissid";
char pass[] = "mywifipass";
char MysqLUser[] = "MysqLuser";
char MysqLPass[] = "MysqLpassword";
char id[] = "someidforthearduino";
WiFiClient wifiClient;
MysqL_Connection MysqLConnection ((Client *)&wifiClient);
IPAddress MysqLServer (/*some kind of address for the MysqL server*/);
bool is_Sending = false;
char queryToExecute[128];
char queryUpdate[] = "somequery";
int nPresses = 0;
void setup() {
Serial.begin(115200);
Serial.println("Inizializzazione pin in corso...");
pinMode(D4,INPUT_PULLUP);
Serial.println("Connessione alla rete in corso...");
WiFi.disconnect();
WiFi.begin(ssid,pass);
while(WiFi.status() != WL_CONNECTED) {
delay(200);
Serial.print(".");
}
Serial.println("");
Serial.print("Connesso con ip ");
Serial.println(WiFi.localIP());
Serial.println("Inizializzazione completata");
}
void loop() {
if (!digitalRead(D4) && !is_Sending) {
is_Sending = true;
nPresses++;
Serial.println("Rilevata pressione tasto. Connessione in corso...");
if (MysqLConnection.connect(MysqLServer,3306,MysqLUser,MysqLPass)) {
Serial.println("");
Serial.println("Connesso. Inserimento dato...");
sprintf(queryToExecute,queryUpdate,nPresses,id);
MysqL_Cursor *c = new MysqL_Cursor(&MysqLConnection);
c->execute(queryToExecute);
delete c;
Serial.println("Aggiornamento effettuato!");
} else {
Serial.println("No db found.");
}
MysqLConnection.close();
is_Sending = false;
}
}
解决方法
我知道了。该代码是正确的,我刚刚为MySQL服务器键入了错误的IP!我是通过打开命令提示符并ping主机名发现它的;
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