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[IVX junior engineer training course 10 papers] 06 database and services

2022-07-02 01:14:00 【1_ bit】

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One 、 Background and database

stay iVX in database As a data storage warehouse , adopt database Can permanently store data , and Background services Play the role of data transmission , take database The data is transferred to the foreground page , The page uses this data again .

1.1.1 Database add

stay iVX Click on the backstage You can create database , The operation process is as follows ：

establish database after , Can be in database Add field values to , The creation method of this field value is the same as Two dimensional array similar . First click on database , In the presence of database Click new field in the edit box , Field can be understood as “ Column ”：

Let's create the following fields in turn ：

Then click the plus sign to enter the specific content ：

In the database , We found that data ID It will be added automatically in order , This is because the database data ID Can't repeat , this ID As the unique identification of this piece of data . stay database in , data ID Just like our personal ID number. , Used to mark personal identification information ：

There are also two automatically generated data here , One for Creation time , For another Update time , The information of these two fields will be recorded automatically ：

1.1.2 Create background services

Now you have created database , Next, we create a database information acquisition service . service Used to be called to get information or perform certain operations , We can set the service logic , When used in other actions service , This service It will execute the operation process set by itself . service You need to select backstage after , Click... In the right column service You can create ：

Then we click service , stay Service edit box The direct editing action in is to use private Database objects perform Output operation , Output Operation means database Will return its own content , Then we used this service You can get database What's stored inside ：

The operation process is as follows ：

When the data return content operation is completed , We also need to set the final return result in the callback as database The value returned ：

Here, set the final result after the execution of the current service as the output result, and use the value output by the object Output , as a result of An array of objects It's easier for us to choose a value .

The operation process is as follows ：

At this point we are The front desk Create a An array of objects , This An array of objects Used to receive database The obtained value content ：

Create good Variable Later, for our convenience , You also need to set Variable The column of and the required database The field name corresponds to , Just set the fields we need ：

Here we assume that there is a requirement , Automatically display... When the page is displayed database How does the value stored in operate ？ In fact, we have done similar examples of this requirement before , At this point, we add an event for the foreground , This event Triggering event by initialization , initialization It means that an event is triggered when the page is preparing , The operation process is as follows ：

Set it up Triggering event after , The selected object is the service just set , Select action as Start the service ：

Then set when the service is processed , We got the returned content for the just created An array of objects Do assignment , The content of the assignment is the value of the returned result of the service ：

The operation process is as follows ：

Finally, we create one in the page Loop variable and Three texts , Set up Loop components The data source of is this An array of objects , Finally, set the values of the three texts to the data obtained by the loop component , This operation process is similar to the previous example, but I will not repeat it here ：