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main.go
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main.go
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package main
import (
"database/sql"
"fmt"
"github.com/go-sql-driver/mysql"
"github.com/pkg/errors"
)
var ErrRecordNotFound = errors.New("record not found")
type User struct {
ID int
Name string
}
func queryByID(db *sql.DB, id int) (*User, error) {
// SQL query
var user User
query := `SELECT id, name
FROM users
WHERE id= $1
`
err := db.QueryRow(query, id).Scan(&user.ID, &user.Name)
if err!=nil {
switch {
case errors.Is(err, sql.ErrNoRows):
return nil, errors.Wrapf(ErrRecordNotFound, "sql: %s %d", query, id)
default:
return nil, errors.Wrapf(err, "sql: %s %d", query, id)
}
}
return &user, nil
}
func main() {
cfg := mysql.Config{
User: "root",
Passwd: "xxx",
Addr: "localhost:3306",
DBName: "xxx",
Net: "tcp",
}
db, err := sql.Open("mysql", cfg.FormatDSN())
if err != nil {
fmt.Errorf("%w", err)
}
fmt.Println(queryByID(db, 27))
if err != nil {
fmt.Println(err)
return
}
}