项目结构更新

scripts/goroutine/connectPool/goroutine/readgo.go

@@ -0,0 +1,35 @@
+package goroutine
+
+import (
+	"database/sql"
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+func Dataread(db *sql.DB, donetitle chan struct{}) {
+	// 启动一个长事务（整个循环在一个事务内，而非每次查询一个事务）
+	tx, err := db.Begin()
+	if err != nil {
+		panic(err)
+	}
+	defer tx.Rollback() // 确保退出时回滚（仅为测试）
+
+	// 随机种子（保持不变）
+	rand.Seed(time.Now().UnixNano())
+
+	// 只执行两次查询，方便观察结果
+	for i := 0; i < 2; i++ {
+		select {
+		case <-time.After(2 * time.Second): // 第一次查询后等待2秒，给Datawrite插入时间
+			var count int
+			err = tx.QueryRow("SELECT count(*) FROM article WHERE age > 50  FOR UPDATE ").Scan(&count)
+			if err != nil {
+				panic(err)
+			}
+			fmt.Printf("第%d次查询 count: %d\n", i+1, count)
+		case <-donetitle:
+			return
+		}
+	}
+}

scripts/goroutine/connectPool/goroutine/updatego.go

@@ -0,0 +1,11 @@
+package goroutine
+
+import "database/sql"
+
+func DataUpdate(db *sql.DB) {
+	_, err := db.Begin()
+	if err != nil {
+		panic(err)
+	}
+
+}

scripts/goroutine/connectPool/goroutine/writego.go

@@ -0,0 +1,45 @@
+package goroutine
+
+import (
+	"database/sql"
+	"fmt"
+	"github.com/google/uuid"
+	"math/rand"
+	"strconv"
+	"time"
+)
+
+func Datawrite(db *sql.DB, donetitle chan struct{}) {
+	timetick := time.Tick(1 * time.Second)
+	rand.Seed(time.Now().UnixNano())
+
+	for {
+		select {
+		case <-timetick:
+			uid, error := uuid.NewRandom()
+			if error != nil {
+				panic(error)
+			}
+			tx, err := db.Begin()
+			if err != nil {
+				panic(err)
+			}
+			fmt.Println("开始事务")
+			_, err = tx.Exec(`insert INTO article (uid,content,author,age) values (?,?,?,?)`, uid, "123", "用户"+strconv.Itoa(rand.Intn(1000)), rand.Intn(40)+60)
+			if err != nil {
+				if rbErr := tx.Rollback(); rbErr != nil {
+					panic("回滚失败: " + rbErr.Error())
+				}
+				panic("插入失败: " + err.Error()) // 明确错误类型
+			}
+			err = tx.Commit()
+			if err != nil {
+				panic(err)
+			}
+			fmt.Println("插入数据成功")
+		case <-donetitle:
+			return
+		}
+	}
+
+}

scripts/goroutine/connectPool/pool.go

@@ -0,0 +1,32 @@
+package connectPool
+
+import (
+	"database/sql"
+	"fmt"
+	_ "github.com/go-sql-driver/mysql"
+	goroutine2 "toutoukan/scripts/goroutine/connectPool/goroutine"
+)
+
+var db *sql.DB
+
+func ConnectPool(donetitle chan struct{}) {
+	dsn := "mayiming:Mydream5654my,@tcp(43.142.81.151:3306)/goLearn?charset-uft8mb4&parseTime=True"
+	db, _ = sql.Open("mysql", dsn)
+
+	err := db.Ping()
+	if err != nil {
+		panic(err)
+	}
+	fmt.Println("数据库连接成功")
+	for i := 0; i < 20; i++ {
+		go goroutine2.Datawrite(db, donetitle)
+	}
+	go goroutine2.Dataread(db, donetitle)
+}
+
+func DisconnectPool() {
+	err := db.Close()
+	if err != nil {
+		panic(err)
+	}
+}