MySQL データベースと Go 言語: フォールト トレランスをどのように処理するか?

import (
    "database/sql"
    _ "github.com/go-sql-driver/mysql"
    "log"
)

func connectToMySQL() (*sql.DB, error) {
    db, err := sql.Open("mysql", "username:password@(host:port)/dbname?timeout=5s")
    if err != nil {
        log.Println("MySQL database connection error:", err)
        return nil, err
    }
    return db, nil
}

func queryFromMySQL(db *sql.DB, condition string) ([]string, error) {
    var results []string
    rows, err := db.Query("SELECT column FROM table WHERE condition=?", condition)
    if err != nil {
        log.Println("MySQL database query error:", err)
        return nil, err
    }
    defer rows.Close()

    for rows.Next() {
        var str string
        if err := rows.Scan(&str); err != nil {
            log.Println("MySQL database rows read error:", err)
            return nil, err
        }
        results = append(results, str)
    }
    if len(results) == 0 {
        log.Println("MySQL query result is empty")
    }
    return results, nil
}

func writeToMySQL(db *sql.DB, data Model) error {
    tx, err := db.Begin()
    if err != nil {
        log.Println("MySQL database transaction error:", err)
        return err
    }

    insertStmt, err := tx.Prepare("INSERT INTO table (column1, column2) VALUES (?, ?)")
    if err != nil {
        log.Println("MySQL database prepare statement error:", err)
        tx.Rollback()
        return err
    }
    defer insertStmt.Close()

    _, err = insertStmt.Exec(data.Column1, data.Column2)
    if err != nil {
        log.Println("MySQL database insert error:", err)
        tx.Rollback()
        return err
    }

    updateStmt, err := tx.Prepare("UPDATE table SET column1=? WHERE column2=?")
    if err != nil {
        log.Println("MySQL database prepare statement error:", err)
        tx.Rollback()
        return err
    }
    defer updateStmt.Close()

    _, err = updateStmt.Exec(data.Column1, data.Column2)
    if err != nil {
        log.Println("MySQL database update error:", err)
        tx.Rollback()
        return err
    }

    err = tx.Commit()
    if err != nil {
        log.Println("MySQL database commit transaction error:", err)
        tx.Rollback()
        return err
    }

    return nil
}