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mysql.go
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mysql.go
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package connection
import (
"fmt"
_ "github.com/go-sql-driver/mysql"
"github.com/jinzhu/gorm"
)
var (
dbs = make(map[string]*Repository)
configs = make(map[string]*MySQLConfig)
defaultDatabaseKey = ""
defaultMySQLConfig = MySQLConfig{
host: "127.0.0.1",
port: "3306",
user: "root",
password: "",
database: "",
}
)
type MySQLOption func(config *MySQLConfig)
func MySQLHost(host string) MySQLOption {
return func(config *MySQLConfig) {
config.host = host
}
}
func MySQLPort(port string) MySQLOption {
return func(config *MySQLConfig) {
config.port = port
}
}
func MySQLUsername(username string) MySQLOption {
return func(config *MySQLConfig) {
config.user = username
}
}
func MySQLPassword(password string) MySQLOption {
return func(config *MySQLConfig) {
config.password = password
}
}
func MySQLDatabase(database string) MySQLOption {
return func(config *MySQLConfig) {
config.database = database
}
}
type MySQLConfig struct {
host string
port string
user string
password string
database string
}
func NewMySQLConfig(options ...MySQLOption) *MySQLConfig {
config := defaultMySQLConfig
for _, option := range options {
option(&config)
}
if conf, ok := configs[config.database]; ok {
return conf
}
if len(configs) == 0 {
defaultDatabaseKey = config.database
}
configs[config.database] = &config
return &config
}
func (m *MySQLConfig) Connect() (err error) {
var repo = &Repository{
config: m,
}
return repo.Connect()
}
func (m *MySQLConfig) Close() error {
if database, ok := dbs[m.database]; ok {
return database.Close()
}
return nil
}
func (m MySQLConfig) getConnectionString() string {
return fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8mb4&loc=%s&parseTime=true",
m.user, m.password, m.host, m.port, m.database, "Local")
}
type Repository struct {
*gorm.DB
config *MySQLConfig
}
func (repo *Repository) Connect() (err error) {
if repo.isConnected() {
return
}
return repo.reconnect()
}
func (repo *Repository) reconnect() (err error) {
logger.WithField("connectionString", repo.config.getConnectionString()).
Info("mysql connect")
repo.DB, err = gorm.Open("mysql", repo.config.getConnectionString())
if err != nil {
logger.Errorf("mysql connect: %v", err)
return
}
repo.DB.SingularTable(true)
logger.Info("mysql connect succeed")
// 将连接放入缓存
dbs[repo.config.database] = repo
return
}
func (repo *Repository) isConnected() bool {
if repo.DB == nil {
return false
}
db := repo.DB.DB()
if db == nil {
return false
}
if err := db.Ping(); err != nil {
return false
}
return true
}
func (repo *Repository) Specify(database string) *Repository {
if repo, ok := dbs[database]; ok {
_ = repo.Connect()
return repo
}
var config MySQLConfig
config = *repo.config
config.database = database
newRepo := &Repository{
config: &config,
}
if err := newRepo.Connect(); err != nil {
logger.WithField("config", config).
WithField("error", err).
Error("connect error")
}
return newRepo
}
func (repo *Repository) Begin() *gorm.DB {
return repo.DB.Begin()
}
func GetMySQLSpecifyDatabase(database string) *Repository {
if len(dbs) == 0 {
return nil
}
if repo, ok := dbs[database]; ok {
_ = repo.Connect()
return repo
}
return dbs[defaultDatabaseKey].Specify(database)
}
func GetMySQL() *Repository {
return dbs[defaultDatabaseKey]
}
func SetMySQL(database string, repo *Repository) {
if len(dbs) == 0 {
defaultDatabaseKey = database
}
dbs[database] = repo
}