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package main
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import (
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"database/sql"
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"fmt"
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mqtt "github.com/eclipse/paho.mqtt.golang"
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_ "github.com/go-sql-driver/mysql"
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"github.com/google/uuid"
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"go_mqtt/models"
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_ "go_mqtt/models"
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"go_mqtt/mydb"
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_ "go_mqtt/mydb"
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"log"
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"strings"
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"time"
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)
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func getMySqlDB() (*sql.DB, error){
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dsn := "root:Skyinno251,@tcp(47.242.184.139:3306)/appserver?charset=utf8mb4&parseTime=True&loc=Local"
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db, err := sql.Open("mysql", dsn)
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if err != nil {
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log.Fatal(err)
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return nil,err
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}
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db.SetConnMaxLifetime(time.Minute * 5) // 连接最大生命周期
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db.SetMaxOpenConns(50) // 最大连接数
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db.SetMaxIdleConns(10) // 最大空闲连接数
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//defer mydb.Close()
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err = db.Ping() // 检查连接是否成功建立。如果失败，则返回错误。
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if err != nil {
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// 处理连接失败的情况。例如，打印错误信息并退出程序。
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log.Println("47.242.184.139:3306连接失败")
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fmt.Println("Connection failed:", err)
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return nil,err
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} else {
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log.Println("47.242.184.139:3306连接成功")
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fmt.Println("Connected successfully")
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//复制代码到你的Go文件中，并根据你的实际情况修改DSN中的用户名、密码、主机名、端口和数据库名。
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//然后运行你的程序。如果一切正常，你应该能够看到查询结果被打印出来。
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//如果遇到任何问题，检查你的DSN是否正确，以及MySQL服务器是否正在运行并允许连接。
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//确保你的防火墙设置允许你的应用程序访问MySQL端口（默认是3306）。
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//如果你使用的是远程数据库，确保网络设置允许你从当前位置访问数据库服务器。
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return db,nil
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}
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}
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func moreDBConnect() {
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db1, err := mydb.NewDatabase("appserver", "root", "Skyinno251,", "47.242.184.139", 3306)
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if err != nil {
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fmt.Println("Error connecting to db1:", err)
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return
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}
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defer db1.Db.Close()
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fmt.Println("Connected to databases:", db1.Name)
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//db2, err := mydb.NewDatabase("db2", "user2", "password2", "localhost", 3306)
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//if err != nil {
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// fmt.Println("Error connecting to db2:", err)
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// return
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//}
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//defer db2.Conn.Close()
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//
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//fmt.Println("Connected to databases:", db1.Name, "and", db2.Name)
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}
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func queryOneDataByMySql(db *sql.DB) {
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//DB.QueryRow 用于查询单行数据，返回的是一个单独的 Row 对象。和 Query 不同，它只返回一行结果，适合用于查询根据条件唯一的数据：
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var temperature models.Temperature
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err := db.QueryRow("SELECT id,create_date,data_date,data_hour,data_minute,humidity,location_desc,temperature,topic FROM temperature order by id desc limit 0,?",1).Scan(&temperature.Id, &temperature.CreateDate, &temperature.DataDate, &temperature.DataHour, &temperature.DataMinute, &temperature.Humidity, &temperature.LocationDesc, &temperature.Temperature, &temperature.Topic)
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if err != nil {
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fmt.Println("QueryRow failed:", err)
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return
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}
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fmt.Printf("Temperature Id:%d\n", temperature.Id)
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fmt.Printf("Temperature: %+v\n", temperature)
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}
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func queryMoreDataByMySql(db *sql.DB) {
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//DB.QueryRow 用于查询单行数据，返回的是一个单独的 Row 对象。和 Query 不同，它只返回一行结果，适合用于查询根据条件唯一的数据：
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rows, err := db.Query("SELECT id,create_date,data_date,data_hour,data_minute,humidity,location_desc,temperature,topic FROM temperature WHERE id > ? and id < ?", 0,30)
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if err != nil {
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fmt.Println("Query failed:", err)
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return
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}
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defer rows.Close() // 确保在使用完毕后关闭资源
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items := make([]models.Temperature, 0)
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for rows.Next() {
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var temperature models.Temperature
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if err := rows.Scan(&temperature.Id, &temperature.CreateDate, &temperature.DataDate, &temperature.DataHour, &temperature.DataMinute, &temperature.Humidity, &temperature.LocationDesc, &temperature.Temperature, &temperature.Topic); err != nil {
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fmt.Println("Scan failed:", err)
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return
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}
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items = append(items, temperature)
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fmt.Println(items)
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}
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}
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//插入单条数据
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func insertDataByMySql(db *sql.DB,temperature *models.Temperature) {
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//插入操作：
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stmt, err := db.Prepare("INSERT INTO temperature(create_date,data_date,data_hour,data_minute,humidity,location_desc,temperature,topic) VALUES(?, ?,?, ?,?, ?,?, ?)")
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if err != nil {
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fmt.Println("Prepare failed:", err)
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return
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}
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res, err := stmt.Exec(&temperature.CreateDate, &temperature.DataDate, &temperature.DataHour, &temperature.DataMinute, &temperature.Humidity, &temperature.LocationDesc, &temperature.Temperature, &temperature.Topic)
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if err != nil {
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fmt.Println("Exec failed:", err)
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return
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}
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lastID, _ := res.LastInsertId()
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fmt.Printf("Inserted Temperature with ID: %d\n", lastID)
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}
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//事务处理：保证数据一致性
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func insertMoreDataByMySql(db *sql.DB,temperature *models.Temperature) {
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tx, err := db.Begin()
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if err != nil {
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fmt.Println("Begin transaction failed:", err)
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return
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}
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_, err = tx.Exec("UPDATE users SET age = ? WHERE id = ?", 35, 1)
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if err != nil {
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tx.Rollback() // 如果发生错误，回滚事务
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fmt.Println("Exec failed:", err)
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return
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}
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err = tx.Commit() // 提交事务
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if err != nil {
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fmt.Println("Commit failed:", err)
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return
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}
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fmt.Println("Transaction committed successfully")
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}
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func dbTest() {
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// 初始化数据库连接
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DB, err := sql.Open("mysql", "root:123456@tcp(127.0.0.1:3306)/test")
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if err != nil {
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fmt.Println("Error opening DB:", err)
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return
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}
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defer DB.Close()
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DB.SetConnMaxLifetime(time.Minute * 5)
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DB.SetMaxOpenConns(50)
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DB.SetMaxIdleConns(10)
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// 测试数据库连接
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if err := DB.Ping(); err != nil {
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fmt.Println("Connection failed:", err)
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return
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}
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fmt.Println("Connected successfully")
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// 查询数据
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rows, _ := DB.Query("SELECT id, name FROM users")
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defer rows.Close()
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for rows.Next() {
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var id int
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var name string
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rows.Scan(&id, &name)
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fmt.Printf("ID: %d, Name: %s\n", id, name)
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}
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// 插入数据
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stmt, _ := DB.Prepare("INSERT INTO users(name, age) VALUES(?, ?)")
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stmt.Exec("Jane Doe", 28)
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// 删除数据
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stmt, _ = DB.Prepare("DELETE FROM users WHERE id = ?")
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stmt.Exec(1)
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}
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func timing(client mqtt.Client) {
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//定时器，10秒钟执行一次
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ticker := time.NewTicker(5 * time.Second)
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for {
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time := <-ticker.C
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fmt.Println("定时器====>", time.String())
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if !client.IsConnectionOpen() {
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client.Connect()
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} else {
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fmt.Println("client has connect")
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//moreDBConnect()
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db, err := getMySqlDB()
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if err == nil {
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queryOneDataByMySql(db)
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//mydb.Close()
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}
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}
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}
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}
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var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
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fmt.Printf("Received message: %s from topic: %s\n", msg.Payload(), msg.Topic())
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message := fmt.Sprintf("%s",msg.Payload())
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topic := fmt.Sprintf("%s",msg.Topic())
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fmt.Println(message)
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result := strings.Split(message, " ")
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fmt.Println(result[0])
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fmt.Println(result[1])
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now := time.Now()
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temperature := new(models.Temperature)
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temperature.CreateDate=now
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temperature.DataDate=now.Format("2006-01-02")
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temperature.DataHour=now.Format("2006-01-02 15")
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temperature.DataMinute=now.Format("2006-01-02 15:04")
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temperature.Humidity=result[0]
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temperature.Temperature=result[1]
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temperature.Topic=topic
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if topic=="WifiSHT/7C87CE9CA4E6/SHT20" {
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temperature.LocationDesc="广东省珠海市高新区唐家湾镇东岸村水风三街28号501"
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}
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if topic=="WifiSHT/7C87CE9F5CBF/SHT20" {
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temperature.LocationDesc="广东省珠海市金湾区三灶镇百川路1号1栋1单元1508房"
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}
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if topic=="WifiSHT/4CEBD686B6AA/SHT20" {
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temperature.LocationDesc="广西壮族自治区崇左市天等县天等镇荣华村弄在屯113号"
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}
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db, err := getMySqlDB()
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if err == nil {
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insertDataByMySql(db,temperature)
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//mydb.Close()
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}
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}
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var connectHandler mqtt.OnConnectHandler = func(client mqtt.Client) {
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fmt.Println("Connected")
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}
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var connectLostHandler mqtt.ConnectionLostHandler = func(client mqtt.Client, err error) {
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fmt.Printf("Connect lost: %v", err)
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}
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func sub(client mqtt.Client) {
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topic := "gomqtt01"
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token := client.Subscribe(topic, 1, nil)
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token.Wait()
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fmt.Printf("Subscribed to topic: %s", topic)
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}
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func subTemperature(client mqtt.Client) {
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topic := "WifiSHT/+/SHT20"
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token := client.Subscribe(topic, 1, nil)
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token.Wait()
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fmt.Printf("Subscribed to topic: %s", topic)
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}
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func publish(client mqtt.Client) {
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num := 999999000000000000
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for i := 0; i < num; i++ {
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text := fmt.Sprintf("Message %d", i)
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token := client.Publish("gomqtt01", 0, false, text)
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token.Wait()
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fmt.Println(i)
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time.Sleep(6 * time.Second)
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}
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}
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func main() {
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uuid := uuid.New()
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fmt.Println("Generated UUID:", uuid)
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var broker = "47.242.184.139"
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var port = 1883
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opts := mqtt.NewClientOptions()
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opts.AddBroker(fmt.Sprintf("tcp://%s:%d", broker, port))
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opts.SetClientID(uuid.String())
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opts.SetUsername("admin")
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opts.SetPassword("publish452131wW452131wW$")
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opts.SetDefaultPublishHandler(messagePubHandler)
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opts.OnConnect = connectHandler
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opts.OnConnectionLost = connectLostHandler
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client := mqtt.NewClient(opts)
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if token := client.Connect(); token.Wait() && token.Error() != nil {
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fmt.Println(token.Error())
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}
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//client.IsConnectionOpen()
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go timing(client)
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//sub(client)
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subTemperature(client)
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publish(client)
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//client.Disconnect(1000)
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}
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