/
dbx.go
142 lines (126 loc) · 3.11 KB
/
dbx.go
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package dbx
import (
"database/sql/driver"
"errors"
"fmt"
_ "github.com/denisenkom/go-mssqldb"
_ "github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
_ "github.com/lib/pq"
"net/url"
"strings"
"sync"
"time"
)
var (
ErrProtocol = errors.New("unrecognized protocol")
)
func Open(url string) (db *sqlx.DB, err error) {
switch {
case strings.HasPrefix(url, "mysql://"):
db, err = sqlx.Open(`mysql`, url[len("mysql://"):])
case strings.HasPrefix(url, "postgres://"):
db, err = sqlx.Open(`postgres`, url)
case strings.HasPrefix(url, "mssql://"):
db, err = sqlx.Open("mssql", splitMssql(url))
default:
db, err = nil, ErrProtocol
}
return db, err
}
func splitMssql(s string) string {
u, err := url.Parse(s)
if err != nil {
panic(err)
}
user := u.User.Username()
pass, _ := u.User.Password()
return fmt.Sprintf("server=%s;user id=%s;password=%s;database=%s", u.Host, user, pass, strings.Trim(u.Path, "/"))
}
// NullTime represents a time.Time that may be null. NullTime implements the
// sql.Scanner interface so it can be used as a scan destination, similar to
// sql.NullString.
type NullTime struct {
Time time.Time
Valid bool // Valid is true if Time is not NULL
}
// Scan implements the Scanner interface.
func (nt *NullTime) Scan(value interface{}) error {
nt.Time, nt.Valid = value.(time.Time)
return nil
}
// Value implements the driver Valuer interface.
func (nt NullTime) Value() (driver.Value, error) {
if !nt.Valid {
return nil, nil
}
return nt.Time, nil
}
type StringMapper struct {
mu sync.Mutex
db *sqlx.DB
arc map[interface{}]string
query string
}
func MapString(db *sqlx.DB, query string) *StringMapper {
return &StringMapper{
db: db,
arc: make(map[interface{}]string),
query: query,
}
}
func (m *StringMapper) Map(key interface{}) (val string, err error) {
m.mu.Lock()
x, ok := m.arc[key]
m.mu.Unlock()
if ok {
return x, nil
}
row := m.db.QueryRow(m.query, key)
if err = row.Scan(&val); err == nil {
m.mu.Lock()
m.arc[key] = val
m.mu.Unlock()
}
return val, err
}
func (m *StringMapper) MustMap(key interface{}) string {
val, err := m.Map(key)
if err != nil {
panic(err)
}
return val
}
// func ProtoWrap(dst interface{}, src interface{}) error {
// dv := reflect.ValueOf(dst)
// sv := reflect.ValueOf(src)
// numField := dv.NumField()
// if numField != sv.NumField() {
// panic(errors.New(fmt.Sprint("dst/src field mismatch")))
// }
// for i := 0; i < numField; i++ {
// sf := sv.Field(i)
// dv := dv.Field(i)
// switch sf.Interface().(type) {
// default:
// panic("unsupported field type")
// case bool:
// p := (*bool)(unsafe.Pointer(sf.Pointer()))
// dv.SetPointer(reflect.ValueOf(p))
// case int:
// p := (*int)(unsafe.Pointer(sf.Pointer()))
// dv.SetPointer(reflect.ValueOf(p))
// case string:
// p := (*string)(unsafe.Pointer(sf.Pointer()))
// dv.SetPointer(reflect.ValueOf(p))
// case time.Time:
// x := sv.Interface().(time.Time)
// s, n := x.Unix(), int32(x.Nanosecond())
// p := &Timestamp{
// Seconds: &s,
// Nanos: &n,
// }
// dv.SetPointer(reflect.ValueOf(p))
// }
// }
// }