Arduino programming the IDE ESP8266-01 Arduino development board inserted into MySql database query data

If your board has a WiFi connection is not the case, and has been an error connection _______........... connection ________......., finally link is not on, please refer to my other one blog: https://blog.csdn.net/yaoyaoyao_123/article/details/103888526

As for how to buy a cloud server, and install the database server on the cloud, yet not learned. In the times we have installed the default MySql, and have created a database arduino_test, built a table test1, the specific construction of the table statement:

create table test1(
   `tem` double(3,1) DEFAULT NULL,
  `hem` double(3,1) DEFAULT NULL
	
)engine=innodb default charset=utf8 auto_increment=1;
alter database arduino_test default character set 'utf8';
SET character_set_client='utf8';
SET character_set_connection='utf8';
SET character_set_results='utf8';

Of course, in the middle there is a lot of detail, do not have time to record, no new messages can be successful.

After the preparatory work done, write Arduino IDE program:

#include <ESP8266WiFi.h>             // esp8266库
#include <MySQL_Connection.h>    // Arduino连接Mysql的库
#include <MySQL_Cursor.h>

IPAddress server_addr(106,12,195,127);   // 安装Mysql的电脑的IP地址
char user[] = "root";              // Mysql的用户名
char password[] = "123456";        // 登陆Mysql的密码

// Mysql中添加一条数据的命令
// arduino_test，test1：刚才创建的数据和表
char INSERT_SQL[] = "INSERT INTO  arduino_test.test1(tem,hem) VALUES ('%s','%s')";

char ssid[] = "TP-LINK_702";         // WiFi名
char pass[] = "weilaoshi";     // WiFi密码

WiFiClient client;                 // 声明一个Mysql客户端，在连接Mysql中使用
MySQL_Connection conn(&client);
MySQL_Cursor* cursor;    // 

int isConnection=0;

// 读取传感器的数据并写入到数据库
void readAndRecordData(){
 char buff[128];// 定义存储传感器数据的数组
 char tem[5];      
 char hem[4];        
 // 将传感器采集的浮点数转换为3位整数一位小数的字串放入temp
 dtostrf(12.56,2,1,tem);//表示把123.56转换成整数部分3位数字，并且一位小数详情https://blog.csdn.net/qq_25827845/article/details/50717522
 dtostrf(23.98,2,1,hem);
 Serial.println(tem);
 Serial.println(hem);
 sprintf(buff,INSERT_SQL,tem,hem); // 将tem和hem中数据放入SQL中sprintf()函数详情https://blog.csdn.net/oyhb_1992/article/details/75095472
 MySQL_Cursor *cur_mem = new MySQL_Cursor(&conn); // 创建一个Mysql实例
 cur_mem->execute(buff);         // 将采集到的温湿度值插入数据库中
 Serial.println("读取传感器数据，并写入数据库");
 delete cur_mem;        // 删除mysql实例为下次采集作准备
}

void setup()
{
  Serial.begin(9600);
  while (!Serial);      //  等待端口的释放
  Serial.printf("\nConnecting to %s", ssid);
  WiFi.begin(ssid, pass);         // 连接WiFi
  while (WiFi.status() != WL_CONNECTED) {       // 如果WiFi没有连接，一直循环打印点
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nConnected to network");
  Serial.print("My IP address is: ");
  Serial.println(WiFi.localIP());     // 打印开发板的IP地址

  Serial.print("Connecting to SQL...  ");
  if (conn.connect(server_addr, 3306, user, password))         // 连接数据库
  {
    isConnection=1;
    Serial.println("成功连接数据库---OK.");   
  }else{
    isConnection=0;
    Serial.println("连接数据库失败---FAILED.");
  }
  cursor = new MySQL_Cursor(&conn);    // 创建一个数据库游标实例
}

void loop()
{
  if(isConnection==1)
  {
    readAndRecordData();        
    delay(5000);
  }

}

Procedures used in the MySQL_Connection library, you need to manually added to it, I've put the bag on the compression library:

To extract to lower Arduino library folder after download.

Upload the program to the development board, you can view the database:

Arduino stop inserting data into the database, representing a success.

Here's the query data in the database: