106 lines
1.9 KiB
Go
106 lines
1.9 KiB
Go
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package mysql
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import (
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"os"
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"strconv"
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"time"
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"gorm.io/driver/mysql"
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"gorm.io/gorm"
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"gorm.io/gorm/logger"
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"gorm.io/gorm/schema"
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"gorm.io/plugin/dbresolver"
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)
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/*
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docker配置
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env MYSQL_DSN=root:root@tcp(mysql:3306)/sample?charset=utf8mb4&parseTime=True&loc=Local
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env MYSQL_MAXLIFETIME=2
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env MYSQL_MAXIDLECONNS=2
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env MYSQL_MAXOPENCONNS=200
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env MYSQL_INIT=true
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*/
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var (
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_db *gorm.DB
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)
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// 创建实例
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func newDB() (*gorm.DB, error) {
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if _db != nil {
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return _db, nil
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}
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dsn := os.Getenv("MYSQL_DSN")
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if dsn == "" {
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dsn = "root:root@tcp(127.0.0.1:3306)/mysql?charset=utf8&parseTime=True&loc=Local"
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}
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maxLifetime := func() int {
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c := os.Getenv("MYSQL_MAXLIFETIME")
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cc, err := strconv.Atoi(c)
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if err != nil {
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return 1
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}
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if cc <= 0 {
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return 1
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}
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if cc >= 1000 {
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cc = 1000
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}
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return cc
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}()
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maxIdleConns := func() int {
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c := os.Getenv("MYSQL_MAXIDLECONNS")
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cc, err := strconv.Atoi(c)
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if err != nil {
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return 1
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}
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if cc < 0 {
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return 0
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}
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if cc >= 1000 {
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cc = 1000
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}
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return cc
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}()
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maxOpenConns := func() int {
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c := os.Getenv("MYSQL_MAXOPENCONNS")
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cc, err := strconv.Atoi(c)
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if err != nil {
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return 1
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}
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if cc < 0 {
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return 0
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}
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if cc >= 1000 {
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cc = 1000
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}
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return cc
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}()
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var err error
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_db, err = gorm.Open(mysql.Open(dsn), &gorm.Config{
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SkipDefaultTransaction: true,
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Logger: logger.Default.LogMode(logger.Silent),
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NamingStrategy: schema.NamingStrategy{
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SingularTable: true,
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},
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})
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if err != nil {
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return nil, err
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}
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_db.Use(
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dbresolver.Register(dbresolver.Config{
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Sources: []gorm.Dialector{mysql.Open(dsn)},
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Replicas: []gorm.Dialector{mysql.Open(dsn)},
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Policy: dbresolver.RandomPolicy{},
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}).SetConnMaxIdleTime(time.Hour).
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SetConnMaxLifetime(time.Duration(maxLifetime) * time.Hour).
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SetMaxIdleConns(maxIdleConns).
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SetMaxOpenConns(maxOpenConns))
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return _db, nil
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}
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