forked from libgo/mysqlx
/
mysql.go
192 lines (162 loc) · 3.63 KB
/
mysql.go
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package mysqlx
import (
"database/sql"
"fmt"
"os"
"strconv"
"strings"
"sync"
"time"
"github.com/go-sql-driver/mysql"
"github.com/jmoiron/sqlx"
)
// alias
type (
DB = sqlx.DB
NullBool = sql.NullBool
NullInt64 = sql.NullInt64
NullFloat64 = sql.NullFloat64
NullString = sql.NullString
NullTime = mysql.NullTime
MySQLError = mysql.MySQLError
)
var bag = &sync.Map{}
// Register dsn format -> [username[:password]@][protocol[(address)]]/dbname[?param1=value1&...¶mN=valueN]
// each db should only register once.
func Register(name string, conf Conf) *DB {
if s := os.Getenv("MYSQL_DSN_" + strings.ToUpper(name)); s != "" {
conf.DSN = s
}
if s := os.Getenv("MYSQL_MAXOPEN_" + strings.ToUpper(name)); s != "" {
d, err := strconv.Atoi(s)
if err == nil {
conf.MaxOpenConns = d
}
}
if s := os.Getenv("MYSQL_MAXIDLE_" + strings.ToUpper(name)); s != "" {
d, err := strconv.Atoi(s)
if err == nil {
conf.MaxIdleConns = d
}
}
if s := os.Getenv("MYSQL_CONNMAXLIFE_" + strings.ToUpper(name)); s != "" {
d, err := time.ParseDuration(s)
if err != nil {
conf.ConnMaxLifetime = d
}
}
if s := os.Getenv("MYSQL_HOOK_" + strings.ToUpper(name)); s == "true" || s == "TRUE" || s == "True" || s == "1" {
conf.HookEnable = true
}
// check if exist
if db, ok := bag.Load(name); ok {
return db.(*DB)
}
db := conf.initialize()
// using load or store to prevent duplicate register.
if act, loaded := bag.LoadOrStore(name, db); loaded {
db.Close()
return act.(*DB)
}
return db
}
// Client returns mysql client, mostly, we use Use() func
func Client(name string) (*DB, error) {
v, ok := bag.Load(name)
if !ok {
return nil, fmt.Errorf("mysql %q not registered", name)
}
return v.(*DB), nil
}
// Use is helper func to get *DB
func Use(name string) *DB {
cli, _ := Client(name)
return cli
}
// HealthCheck ping db
func HealthCheck() error {
errs := make(map[string]error)
bag.Range(func(k, v interface{}) bool {
if err := v.(*DB).Ping(); err != nil {
errs[k.(string)] = err
}
return true
})
if len(errs) != 0 {
return fmt.Errorf("%v", errs)
}
return nil
}
// Close closes all mysql conn, TODO maybe we should return close err.
func Close() error {
bag.Range(func(k, v interface{}) bool {
v.(*DB).Close()
return true
})
return nil
}
var (
ErrNoRows = sql.ErrNoRows
)
var (
In = sqlx.In
Get = sqlx.Get
GetContext = sqlx.GetContext
Select = sqlx.Select
SelectContext = sqlx.SelectContext
Named = sqlx.Named
NamedExec = sqlx.NamedExec
NamedExecContext = sqlx.NamedExecContext
NamedQuery = sqlx.NamedQuery
NamedQueryContext = sqlx.NamedQueryContext
)
// MySQLErr try conver mysql err to *MySQLError
func MySQLErr(err error) *MySQLError {
if err == nil {
return nil
}
if e, ok := err.(*MySQLError); ok {
return e
}
return nil
}
// IsNoRowsErr
func IsNoRowsErr(err error) bool {
return err == sql.ErrNoRows
}
// IsDupErr check if mysql error is ER_DUP_ENTRY
// https://github.com/VividCortex/mysqlerr
func IsDupErr(err error) bool {
e := MySQLErr(err)
return e != nil && e.Number == 1062
}
type e struct {
code uint32
msg string
}
func (e e) Code() uint32 {
return e.code
}
func (e e) Message() string {
return e.msg
}
func (e e) Error() string {
return fmt.Sprintf("[%d]%s", e.code, e.msg)
}
// IsUnChanged checks if result.RowsAffected is 0
func IsUnChanged(result sql.Result, err error) error {
if err != nil {
return err
}
aff, err := result.RowsAffected()
if err != nil {
return err
}
if aff == 0 {
return e{
code: 10304,
msg: "RowsAffected is 0",
}
}
return nil
}