Course Summary - The Use of Databases in Application Development

12002

Course Introduction

In previous lessons, we have mastered the basic skills of database design and optimization. In this lesson, we will summarize the key functions of databases in application development, understanding that the core task of application development is to provide functionalities for data creation, deletion, modification, and querying, with databases playing an indispensable role in this process. Additionally, we will delve into the interaction processes between databases and front-end and back-end systems, laying a solid foundation and guidance for future practices and success in the field of application development.

1. Application Development and Data Operations

One of the key tasks in application development is to provide functionalities for data creation, deletion, modification, and querying. The essence of an application is to provide users with convenient and quick tools to operate on data, much like managing personal files. Databases serve a role similar to that of a filing cabinet, helping applications store and manage data, and developers need to ensure that users can easily interact with the data.

For example, suppose we develop a student information management system. In this system, we need to be able to add new students, delete existing students, modify student information, and search for specific students. These operations involve creating, deleting, modifying, and querying the student table in the database.

A well-designed database structure and efficient data operations are key to ensuring the smooth operation of applications. By optimizing the database structure and data operations, the performance and reliability of the application can be improved. Therefore, understanding the importance of data operations is crucial for developing excellent applications.

By reasonably designing the database structure and optimizing data operations, developers can ensure that applications manage data efficiently, enhance user experience, and achieve faster and more reliable operations.

2. Interaction Process Between Databases and Front-end/Back-end

In application development, the interaction between databases and the front-end and back-end is crucial. When the front-end needs data, it sends a request to the back-end. The back-end processes these requests and interacts with the database to retrieve or update data. The back-end then sends the processed data back to the front-end, which updates the interface with the latest information for the user. This process ensures the security and accuracy of the data.

For instance, in web operations, after a user fills out a form and clicks submit, the front-end sends a request to the back-end. Upon receiving the request, the back-end interacts with the database to perform the corresponding operations, such as querying or updating data. After the database executes the operation, the back-end returns the results to the front-end, which then updates the interface to show the latest information to the user. You can understand this process as follows:

Front-end requests data:

Users trigger certain operations through the front-end interface, such as clicking buttons or filling out forms, prompting the front-end to request or submit data to the back-end.

Front-end sends request to back-end:

The front-end sends the request to the back-end server over the network, which may include data query conditions, data update content, or other operational information.

Back-end receives request:

The back-end server receives the request sent by the front-end and processes it based on the type and content of the request, including user permission verification and business logic processing.

Back-end interacts with the database:

The back-end interacts with the database based on the request content, executing database operations such as querying data, updating data, inserting data, or deleting data.

Database executes operation:

Upon receiving the request from the back-end, the database performs the corresponding operation, retrieving or updating data, and returns the operation results to the back-end.

Back-end processes database return results:

The back-end receives the results returned by the database and processes them accordingly, which may include data formatting and business logic handling.

Back-end returns processed results to front-end:

The back-end returns the processed data results to the front-end, which can update the interface content or perform other operations based on the returned data.

Front-end updates interface:

After receiving the data results returned by the back-end, the front-end updates the interface content to display the data or perform other operations, allowing users to see the latest data status.

This process demonstrates the collaborative work between databases, front-end, and back-end, ensuring effective data transmission, processing, and presentation. Good database design and optimization can enhance the efficiency and performance of the entire interaction process, thereby improving the user experience of the application.

3. Introduction to the Next Course and Learning Path

## Course Introduction

In previous lessons, we have mastered the basic skills of database design and optimization. In this lesson, we will summarize the key functions of databases in application development, understanding that the core task of application development is to provide functionalities for data creation, deletion, modification, and querying, with databases playing an indispensable role in this process. Additionally, we will delve into the interaction processes between databases and front-end and back-end systems, laying a solid foundation and guidance for future practices and success in the field of application development.

## 1. Application Development and Data Operations

One of the key tasks in application development is to provide functionalities for data creation, deletion, modification, and querying. The essence of an application is to provide users with convenient and quick tools to operate on data, much like managing personal files. Databases serve a role similar to that of a filing cabinet, helping applications store and manage data, and developers need to ensure that users can easily interact with the data.

For example, suppose we develop a student information management system. In this system, we need to be able to add new students, delete existing students, modify student information, and search for specific students. These operations involve creating, deleting, modifying, and querying the student table in the database.

A well-designed database structure and efficient data operations are key to ensuring the smooth operation of applications. By optimizing the database structure and data operations, the performance and reliability of the application can be improved. Therefore, understanding the importance of data operations is crucial for developing excellent applications.

By reasonably designing the database structure and optimizing data operations, developers can ensure that applications manage data efficiently, enhance user experience, and achieve faster and more reliable operations.

## 2. Interaction Process Between Databases and Front-end/Back-end

In application development, the interaction between databases and the front-end and back-end is crucial. When the front-end needs data, it sends a request to the back-end. The back-end processes these requests and interacts with the database to retrieve or update data. The back-end then sends the processed data back to the front-end, which updates the interface with the latest information for the user. This process ensures the security and accuracy of the data.

For instance, in web operations, after a user fills out a form and clicks submit, the front-end sends a request to the back-end. Upon receiving the request, the back-end interacts with the database to perform the corresponding operations, such as querying or updating data. After the database executes the operation, the back-end returns the results to the front-end, which then updates the interface to show the latest information to the user. You can understand this process as follows:

1. Front-end requests data:

Users trigger certain operations through the front-end interface, such as clicking buttons or filling out forms, prompting the front-end to request or submit data to the back-end.

2. Front-end sends request to back-end:

The front-end sends the request to the back-end server over the network, which may include data query conditions, data update content, or other operational information.

3. Back-end receives request:

The back-end server receives the request sent by the front-end and processes it based on the type and content of the request, including user permission verification and business logic processing.

4. Back-end interacts with the database:

The back-end interacts with the database based on the request content, executing database operations such as querying data, updating data, inserting data, or deleting data.

5. Database executes operation:

Upon receiving the request from the back-end, the database performs the corresponding operation, retrieving or updating data, and returns the operation results to the back-end.

6. Back-end processes database return results:

The back-end receives the results returned by the database and processes them accordingly, which may include data formatting and business logic handling.

7. Back-end returns processed results to front-end:

The back-end returns the processed data results to the front-end, which can update the interface content or perform other operations based on the returned data.

8. Front-end updates interface:

After receiving the data results returned by the back-end, the front-end updates the interface content to display the data or perform other operations, allowing users to see the latest data status.

This process demonstrates the collaborative work between databases, front-end, and back-end, ensuring effective data transmission, processing, and presentation. Good database design and optimization can enhance the efficiency and performance of the entire interaction process, thereby improving the user experience of the application.

## 3. Introduction to the Next Course and Learning Path