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fatedier
298
vendor/github.com/fatedier/beego/orm/db_alias.go
generated
vendored
Normal file
298
vendor/github.com/fatedier/beego/orm/db_alias.go
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vendored
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@@ -0,0 +1,298 @@
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// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package orm
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import (
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"database/sql"
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"fmt"
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"reflect"
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"sync"
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"time"
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)
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// DriverType database driver constant int.
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type DriverType int
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// Enum the Database driver
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const (
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_ DriverType = iota // int enum type
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DRMySQL // mysql
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DRSqlite // sqlite
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DROracle // oracle
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DRPostgres // pgsql
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DRTiDB // TiDB
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)
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// database driver string.
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type driver string
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// get type constant int of current driver..
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func (d driver) Type() DriverType {
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a, _ := dataBaseCache.get(string(d))
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return a.Driver
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}
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// get name of current driver
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func (d driver) Name() string {
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return string(d)
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}
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// check driver iis implemented Driver interface or not.
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var _ Driver = new(driver)
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var (
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dataBaseCache = &_dbCache{cache: make(map[string]*alias)}
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drivers = map[string]DriverType{
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"mysql": DRMySQL,
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"postgres": DRPostgres,
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"sqlite3": DRSqlite,
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"tidb": DRTiDB,
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"oracle": DROracle,
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}
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dbBasers = map[DriverType]dbBaser{
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DRMySQL: newdbBaseMysql(),
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DRSqlite: newdbBaseSqlite(),
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DROracle: newdbBaseOracle(),
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DRPostgres: newdbBasePostgres(),
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DRTiDB: newdbBaseTidb(),
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}
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)
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// database alias cacher.
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type _dbCache struct {
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mux sync.RWMutex
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cache map[string]*alias
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}
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// add database alias with original name.
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func (ac *_dbCache) add(name string, al *alias) (added bool) {
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ac.mux.Lock()
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defer ac.mux.Unlock()
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if _, ok := ac.cache[name]; !ok {
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ac.cache[name] = al
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added = true
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}
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return
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}
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// get database alias if cached.
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func (ac *_dbCache) get(name string) (al *alias, ok bool) {
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ac.mux.RLock()
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defer ac.mux.RUnlock()
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al, ok = ac.cache[name]
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return
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}
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// get default alias.
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func (ac *_dbCache) getDefault() (al *alias) {
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al, _ = ac.get("default")
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return
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}
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type alias struct {
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Name string
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Driver DriverType
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DriverName string
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DataSource string
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MaxIdleConns int
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MaxOpenConns int
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DB *sql.DB
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DbBaser dbBaser
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TZ *time.Location
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Engine string
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}
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func detectTZ(al *alias) {
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// orm timezone system match database
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// default use Local
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al.TZ = time.Local
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if al.DriverName == "sphinx" {
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return
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}
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switch al.Driver {
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case DRMySQL:
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row := al.DB.QueryRow("SELECT TIMEDIFF(NOW(), UTC_TIMESTAMP)")
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var tz string
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row.Scan(&tz)
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if len(tz) >= 8 {
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if tz[0] != '-' {
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tz = "+" + tz
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}
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t, err := time.Parse("-07:00:00", tz)
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if err == nil {
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al.TZ = t.Location()
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} else {
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DebugLog.Printf("Detect DB timezone: %s %s\n", tz, err.Error())
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}
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}
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// get default engine from current database
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row = al.DB.QueryRow("SELECT ENGINE, TRANSACTIONS FROM information_schema.engines WHERE SUPPORT = 'DEFAULT'")
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var engine string
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var tx bool
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row.Scan(&engine, &tx)
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if engine != "" {
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al.Engine = engine
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} else {
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al.Engine = "INNODB"
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}
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case DRSqlite, DROracle:
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al.TZ = time.UTC
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case DRPostgres:
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row := al.DB.QueryRow("SELECT current_setting('TIMEZONE')")
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var tz string
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row.Scan(&tz)
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loc, err := time.LoadLocation(tz)
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if err == nil {
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al.TZ = loc
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} else {
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DebugLog.Printf("Detect DB timezone: %s %s\n", tz, err.Error())
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}
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}
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}
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func addAliasWthDB(aliasName, driverName string, db *sql.DB) (*alias, error) {
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al := new(alias)
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al.Name = aliasName
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al.DriverName = driverName
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al.DB = db
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if dr, ok := drivers[driverName]; ok {
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al.DbBaser = dbBasers[dr]
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al.Driver = dr
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} else {
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return nil, fmt.Errorf("driver name `%s` have not registered", driverName)
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}
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err := db.Ping()
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if err != nil {
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return nil, fmt.Errorf("register db Ping `%s`, %s", aliasName, err.Error())
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}
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if dataBaseCache.add(aliasName, al) == false {
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return nil, fmt.Errorf("DataBase alias name `%s` already registered, cannot reuse", aliasName)
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}
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return al, nil
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}
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// AddAliasWthDB add a aliasName for the drivename
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func AddAliasWthDB(aliasName, driverName string, db *sql.DB) error {
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_, err := addAliasWthDB(aliasName, driverName, db)
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return err
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}
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// RegisterDataBase Setting the database connect params. Use the database driver self dataSource args.
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func RegisterDataBase(aliasName, driverName, dataSource string, params ...int) error {
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var (
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err error
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db *sql.DB
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al *alias
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)
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db, err = sql.Open(driverName, dataSource)
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if err != nil {
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err = fmt.Errorf("register db `%s`, %s", aliasName, err.Error())
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goto end
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}
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al, err = addAliasWthDB(aliasName, driverName, db)
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if err != nil {
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goto end
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}
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al.DataSource = dataSource
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detectTZ(al)
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for i, v := range params {
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switch i {
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case 0:
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SetMaxIdleConns(al.Name, v)
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case 1:
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SetMaxOpenConns(al.Name, v)
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}
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}
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end:
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if err != nil {
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if db != nil {
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db.Close()
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}
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DebugLog.Println(err.Error())
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}
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return err
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}
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// RegisterDriver Register a database driver use specify driver name, this can be definition the driver is which database type.
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func RegisterDriver(driverName string, typ DriverType) error {
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if t, ok := drivers[driverName]; ok == false {
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drivers[driverName] = typ
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} else {
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if t != typ {
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return fmt.Errorf("driverName `%s` db driver already registered and is other type\n", driverName)
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}
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}
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return nil
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}
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// SetDataBaseTZ Change the database default used timezone
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func SetDataBaseTZ(aliasName string, tz *time.Location) error {
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if al, ok := dataBaseCache.get(aliasName); ok {
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al.TZ = tz
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} else {
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return fmt.Errorf("DataBase alias name `%s` not registered\n", aliasName)
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}
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return nil
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}
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// SetMaxIdleConns Change the max idle conns for *sql.DB, use specify database alias name
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func SetMaxIdleConns(aliasName string, maxIdleConns int) {
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al := getDbAlias(aliasName)
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al.MaxIdleConns = maxIdleConns
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al.DB.SetMaxIdleConns(maxIdleConns)
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}
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// SetMaxOpenConns Change the max open conns for *sql.DB, use specify database alias name
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func SetMaxOpenConns(aliasName string, maxOpenConns int) {
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al := getDbAlias(aliasName)
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al.MaxOpenConns = maxOpenConns
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// for tip go 1.2
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if fun := reflect.ValueOf(al.DB).MethodByName("SetMaxOpenConns"); fun.IsValid() {
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fun.Call([]reflect.Value{reflect.ValueOf(maxOpenConns)})
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}
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}
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// GetDB Get *sql.DB from registered database by db alias name.
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// Use "default" as alias name if you not set.
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func GetDB(aliasNames ...string) (*sql.DB, error) {
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var name string
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if len(aliasNames) > 0 {
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name = aliasNames[0]
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} else {
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name = "default"
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}
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al, ok := dataBaseCache.get(name)
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if ok {
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return al.DB, nil
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}
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return nil, fmt.Errorf("DataBase of alias name `%s` not found\n", name)
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}
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