The practice of beego framework developed by goweb: Section 4 database configuration and connection

In the previous section, I summarized beego frame , This lesson continues to learn database configuration and ORM Introduction to mapping relationship

mysql Database installation

mysql Official download site ：https://dev.mysql.com/downloads/  We use 5.7 edition , Download link ：https://dev.mysql.com/downloads/mysql/5.7.html#downloads

Select download installation file , And install locally . During installation , If the initial password appears , Remember the password , Use when logging in for the first time .

【 Be careful 】windows Installation instructions ：https://jingyan.baidu.com/article/09ea3ededa53b7c0aede39b5.html

After installation , take mysql Of bin Directory path add configuration to environment variable , In order to be able to use login in the terminal command line mysql.

Log in to the terminal mysql The order of ：

mysql -root root -p

Enter the password set during installation or yourself to log in successfully . As shown below ：

As shown in the above figure, it indicates that the login is successful . In order to use your own password , You can set a password you are familiar with , Make it easy to remember .

mysql Database common commands

mysql Some commands of the database use ：

• view the database ：
  show databases;
• Use a database ：
  use databaseName;
• Show a list of database tables ：
  show tables;
• mysql Some other commands in ：

above mysql Data operations are in the form of command line terminals , In order to facilitate our daily operation , We can use graphical interface tools , In this case we are using navicat Tools . Now let's see how to install .

Navicat install

navicat Tool download address ：https://www.navicat.com/en/download/navicat-for-mysql

In the link above , Choose your own system version , Then download the installation file , Installation , Always choose the next step by default , Finally installed successfully .

After installation , stay mysql Create a new database in the database , For example, the name is ：myblog; After creating the database , Let's take a look at beego How to use in a project mysql database .

Database driven

We told you before , Database programming belongs to beego Medium Models layer , Also known as ORM modular .

stay beego in , At present, three database drivers are supported , Namely ：

• MySQL：http://github.com/go-sql-driver/mysql
• PostgreSQL：http://github.com/lib/pq
• Sqlite3：http://github.com/mattn/go-sqlite3

beego Medium ORM Several features ：

• 1） Support Go All types of language storage
• 2）CRUD It's easy to operate
• 3） Automatically Join Association table
• 4） Allow direct use of SQL Inquire about

beego Project use mysql

• 1、 Import the corresponding database driver   such as mysql：
  import _ "http://github.com/go-sql-driver/mysql"

• 2、 Registration drive , Connect to database   Register the database driver with the following two sentences , And the operation of connecting to the database ：
  orm.RegisterDriver("mysql",orm.DRMySQL)
  orm.RegisterDataBase(aliasName,driverName,dbConn)
  The detailed code is as follows ：

• 3、 Create the database and execute the program

The connection code is as follows ：

package models
​
import (
    "github.com/astaxie/beego"
    "github.com/astaxie/beego/orm"
    "BlogProject/MysqlDemo/util"
    // Bear in mind ： Import driver package 
    _ "github.com/go-sql-driver/mysql"
)
​
func init() {
​
    driverName := beego.AppConfig.String("driverName")
​
    // Register database driver 
    orm.RegisterDriver(driverName, orm.DRMySQL)
​
    // Database connection 
    user := beego.AppConfig.String("mysqluser")
    pwd := beego.AppConfig.String("mysqlpwd")
    host := beego.AppConfig.String("host")
    port := beego.AppConfig.String("port")
    dbname := beego.AppConfig.String("dbname")
​
    //dbConn := "root:[email protected](127.0.0.1:3306)/cmsproject?charset=utf8"
    dbConn := user + ":" + pwd + "@tcp(" + host + ":" + port + ")/" + dbname + "?charset=utf8"
​
    err := orm.RegisterDataBase("default", driverName, dbConn)
    if err != nil {
        util.LogError(" Error connecting to database ")
        return
    }
    util.LogInfo(" Successfully connected to database ")
​
}
​