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mysql.go
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mysql.go
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// Copyright 2021 dairongpeng <dairongpeng@foxmail.com>. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package db
import (
"fmt"
"time"
"gorm.io/driver/mysql"
"gorm.io/gorm"
"gorm.io/gorm/logger"
)
// Options defines optsions for mysql database.
type Options struct {
Host string
Username string
Password string
Database string
MaxIdleConnections int
MaxOpenConnections int
MaxConnectionLifeTime time.Duration
LogLevel int
Logger logger.Interface
}
// New create a new gorm db instance with the given options.
func New(opts *Options) (*gorm.DB, error) {
dsn := fmt.Sprintf(`%s:%s@tcp(%s)/%s?charset=utf8&parseTime=%t&loc=%s`,
opts.Username,
opts.Password,
opts.Host,
opts.Database,
true,
"Local")
db, err := gorm.Open(mysql.Open(dsn), &gorm.Config{
Logger: opts.Logger,
})
if err != nil {
return nil, err
}
sqlDB, err := db.DB()
if err != nil {
return nil, err
}
// SetMaxOpenConns sets the maximum number of open connections to the database.
sqlDB.SetMaxOpenConns(opts.MaxOpenConnections)
// SetConnMaxLifetime sets the maximum amount of time a connection may be reused.
sqlDB.SetConnMaxLifetime(opts.MaxConnectionLifeTime)
// SetMaxIdleConns sets the maximum number of connections in the idle connection pool.
sqlDB.SetMaxIdleConns(opts.MaxIdleConnections)
return db, nil
}