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sqlite3.go
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sqlite3.go
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package sqlite3
import (
"fmt"
_ "github.com/mattn/go-sqlite3"
"gorm.io/driver/sqlite"
"gorm.io/gorm"
"gorm.io/plugin/dbresolver"
"sync"
"time"
)
type DbInfo struct {
DbConfig *ConfigItem
Conn *gorm.DB
}
var instance *DbInfo
var lock = &sync.Mutex{}
func LoadDb() *DbInfo {
if instance != nil {
return instance
}
lock.Lock()
defer lock.Unlock()
if instance == nil {
dbConf := getDbConfig()
if dbConf == nil {
return nil
}
dnInfo := new(DbInfo)
dnInfo.DbConfig = dbConf
dnInfo.InitConnect()
instance = dnInfo
}
return instance
}
func (info *DbInfo) InitConnect() {
dbConf := info.DbConfig
dsn := fmt.Sprintf("%s:%s?cache=shared&mode=rwc", dbConf.Type, dbConf.Path)
if len(dbConf.User) > 0 {
dsn = fmt.Sprintf("%s&_auth&_auth_user=%s&_auth_pass=%s", dsn, dbConf.User, dbConf.Password)
}
if db, e := gorm.Open(sqlite.Open(dsn), &gorm.Config{}); e != nil {
info.Conn = nil
} else {
if dbConf.Idle == 0 {
dbConf.Idle = 5
}
if dbConf.Open == 0 {
dbConf.Open = 20
}
_ = db.Use(dbresolver.Register(dbresolver.Config{}).SetMaxIdleConns(int(dbConf.Idle)).SetMaxOpenConns(int(dbConf.Open)).SetConnMaxLifetime(time.Second * 3300))
db = db.Session(&gorm.Session{})
info.Conn = db
}
}
func (info *DbInfo) CheckAndReturnConn() *gorm.DB {
if info.Conn == nil {
lock.Lock()
defer lock.Unlock()
if info.Conn == nil || info.Conn.Error != nil {
info.InitConnect()
}
}
if info.Conn == nil {
return nil
}
return info.Conn
}
func GetDb() *gorm.DB {
ins := LoadDb()
if ins == nil {
return nil
}
return ins.CheckAndReturnConn()
}
type ConfigItem struct {
Type string `json:"type"`
Path string `json:"path"`
User string `json:"user"`
Password string `json:"password"`
Open int64 `json:"open"`
Idle int64 `json:"idle"`
}
func getDbConfig() *ConfigItem {
return &ConfigItem{
Type: "file",
Path: "db.sqlite3",
User: "",
Password: "",
Open: 0,
Idle: 0,
}
}