golang mysql连接池

配置文件：

[spu]
user_name = xxx
password = xxx
host = 192.168.1.xxx
database = liexin_spu
table_prefix =xxx
type = mysql

#线上地址
#user:passwd@ip:port/databases
[supp]
user_name = xxx
password = xxx
host = xxx
database = xxx
table_prefix =lie_
type = mysql

[cms]
user_name = xxx
password = xxx
host = xxx
database = xxx
table_prefix =
type = mysql

配置多个mysql数据库

package config

type BaseDatabase struct {
    UserName    string
    Password    string
    Host        string
    Database    string
    MaxIdleCons int
    MaxOpenCons int
    Prefix      string
}

//多数据库配置
func BuildDatabaseList() (DatabaseList map[string]BaseDatabase) {
    return map[string]BaseDatabase{
        "spu": {
            UserName: Get("spu.user_name").String(),
            Password: Get("spu.password").String(),
            Host:     Get("spu.host").String(),
            Database: Get("spu.database").String(),
            Prefix:   Get("spu.table_prefix").String(),
        },
        "supp": {
            UserName: Get("supp.user_name").String(),
            Password: Get("supp.password").String(),
            Host:     Get("supp.host").String(),
            Database: Get("supp.database").String(),
            Prefix:   Get("supp.table_prefix").String(),
        },
        "cms": {
            UserName: Get("cms.user_name").String(),
            Password: Get("cms.password").String(),
            Host:     Get("cms.host").String(),
            Database: Get("cms.database").String(),
            Prefix:   Get("cms.table_prefix").String(),
        },
    }
}

实现mysql连接池

package mysql

import (
    "fmt"
    _ "github.com/go-sql-driver/mysql"
    "github.com/go-xorm/xorm"
    "search_server/pkg/config"
    "search_server/pkg/e"
)

var DatabaseConMap map[string]*xorm.Engine

func Setup() error {
    DatabaseConMap = make(map[string]*xorm.Engine, 0)
    DatabaseList := config.BuildDatabaseList()
    var err error
    //循环生成数据库链接
    for conName, db := range DatabaseList {
        userName := db.UserName
        password := db.Password
        host := db.Host
        database := db.Database

        dataSourceName := fmt.Sprintf("%s:%s@tcp(%s)/%s?charset=utf8", userName, password, host, database)

        DatabaseConMap[conName], err = xorm.NewEngine("mysql", dataSourceName)
        if err != nil {
            return e.NewFatalError(err.Error()) //这里返回致命异常
        }

        //日志打印SQL
        DatabaseConMap[conName].ShowSQL(true)

        //设置连接池的空闲数大小
        DatabaseConMap[conName].SetMaxIdleConns(db.MaxIdleCons)
        //设置最大打开连接数
        DatabaseConMap[conName].SetMaxOpenConns(db.MaxOpenCons)

    }

    return nil
}

func Conn(conName string) *xorm.Engine {
    return DatabaseConMap[conName]
}