Golang开发：优化数据库连接池的性能与效率

package main

import (
    "database/sql"

    _ "github.com/go-sql-driver/mysql"
)

func main() {
    // 创建数据库连接池
    db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/database")
    if err != nil {
        panic(err.Error())
    }
    defer db.Close()

    // 设置连接池的最大打开连接数和最大空闲连接数
    db.SetMaxOpenConns(100)
    db.SetMaxIdleConns(10)

    // 使用连接池进行数据库查询
    rows, err := db.Query("SELECT * FROM table")
    if err != nil {
        panic(err.Error())
    }
    defer rows.Close()

    for rows.Next() {
        // 处理查询结果
    }

    if err = rows.Err(); err != nil {
        panic(err.Error())
    }
}

package main

import (
    "database/sql"
    "fmt"
    "os"
    "runtime/trace"

    "github.com/go-sql-driver/mysql"
)

func main() {
    dsn := "user:password@tcp(localhost:3306)/database"
    sql.Register("mysql-trace", trace.Driver(mysql.MySQLDriver{}))
    db, err := sql.Open("mysql-trace", dsn)
    if err != nil {
        fmt.Println("Failed to connect to database:", err)
        os.Exit(1)
    }
    defer db.Close()

    // 开启性能跟踪
    trace.Start(os.Stdout)
    defer trace.Stop()

    // 查询数据库
    rows, err := db.Query("SELECT * FROM table")
    if err != nil {
        fmt.Println("Failed to query database:", err)
        os.Exit(1)
    }
    defer rows.Close()

    for rows.Next() {
        // 处理查询结果
    }

    if err = rows.Err(); err != nil {
        fmt.Println("Error while iterating over rows of query result:", err)
        os.Exit(1)
    }
}