Using Session to achieve data persistence in Beego

Beego is an excellent Web framework. Its Session function can help us achieve the persistence of user data. Let's introduce how to use Session in Beego.

First, we need to set up Session in the project. The specific steps are as follows:

1. Add the following configuration to the app.conf file under the conf folder in the project:

SessionOn = true
SessionProvider = file
SessionProviderConfig = ./tmp
SessionName = beegosessionID
SessionGCMaxLifetime = 3600
SessionSavePath = /tmp

These configuration items respectively represent:

• SessionOn: Set whether to open the Session. The default value is false. Here we set it to true.
• SessionProvider: Specify the storage method of Session. Here we use file to indicate storage in a file.
• SessionProviderConfig: Specify the storage path of the Session file, here we set it to ./tmp.
• SessionName: Set the name of the Session, here we set it to beegosessionID.
• SessionGCMaxLifetime: Session expiration time, in seconds. Here we set it to 3600 seconds.
• SessionSavePath: The saving path of the Session file.

2. Add the following code to the main.go file of the project:

beego.BConfig.WebConfig.Session.SessionOn = true

This line of code means opening the Session.

3. In the controller where we need to use Session, we can perform read and write operations by calling the Session property of beego.Controller.

For example:

//读取Session
name := this.GetSession("name")
if name != nil {
    this.Data["name"] = name.(string)
}

//写入Session
this.SetSession("name", "Jack")

Among them, the GetSession method is used to read the data in the Session. If there is no such data in the Session, nil is returned; the SetSession method is used to write the data to the Session.

In this way, we have completed the configuration and use of Session.

Next, let’s take a look at the implementation principle of Session.

When we open the Session, Beego will set a value named beegosessionID in the Cookie. This value is a randomly generated string.

When we visit the website, this identifier will be included in the requested cookie, and Beego will read the corresponding data from the Session file based on this identifier.

When we write to the Session, Beego will serialize and store the data into the Session file. At the same time, this identifier will be written in the response Cookie to ensure that it can be read on the next visit. to this data.

In addition, Beego also provides automatic cleaning function of Session. When the session expires or the user leaves the website, Beego will automatically clean up the expired session to ensure that the session file will not grow excessively due to useless data.

In short, the Session function in Beego provides us with a convenient data persistence method, which can make our application more stable and secure through reasonable use.

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