How to use thinkorm to quickly implement the addition, deletion, modification and query functions of the database

How to use thinkorm to quickly implement the addition, deletion, modification and query functions of the database

Introduction:
The database is an indispensable part of modern software applications, and adding, deleting, modifying and querying the database are common Operations are essential in the development process. ThinkORM is a powerful and easy-to-use Python database framework that can help us quickly implement these operations. This article will introduce how to use ThinkORM to implement the addition, deletion, modification and query functions of the database, and provide corresponding code examples.

Keywords: ThinkORM, database, add, delete, modify and query functions, Python, code examples

1. Install ThinkORM
First, we need to install the ThinkORM library. You can install ThinkORM by running the following command in the command line:

pip install thinkorm

2. Connect to the database
Before using ThinkORM, we need to connect to the database first. First, we need to import the thinkorm module in the code:

from thinkorm import Model, database

Then, we can connect to the database in the following way:

database.set_db(
    'mysql://username:password@localhost:3306/database_name'
)

Where:

• 'mysql: //' represents the database type, here we are using the MySQL database.
• 'username' and 'password' are your MySQL username and password.
• 'localhost:3306' is the address and port number of the MySQL server.
• 'database_name' is the name of the specific database you want to connect to.

3. Define the model
Before using ThinkORM, we need to first define the table structure in the database. We can create our model class by inheriting the thinkorm.Model class and specify the table name and fields corresponding to the database.

Taking the implementation of the addition, deletion, modification and query function of a student information as an example, we can create a model class named Student:

class Student(Model):
    table_name = 'student'
    fields = {
        'id': 'int primary key auto_increment',
        'name': 'varchar(20)',
        'age': 'int',
        'gender': 'varchar(10)'
    }

In the above code, we specify the table by setting the table_name attribute Name it 'student' and set the fields attribute to define the fields.

4. Insert data
Now that we have connected to the database and defined the model class, we can start adding, deleting, modifying and querying the database. First, let's insert a piece of data.

In ThinkORM, we can insert data in the following ways:

student = Student(name='张三', age=18, gender='男')
student.save()

In the above code, we first create a Student object and set its properties. Then call the save() method to save the data to the database.

5. Query data
Next, let us implement the query function. Using ThinkORM, we can query the database very conveniently. The following are some common query operation examples:

1. Query all student information:

   students = Student.select()
   for student in students:
    print(student.name, student.age, student.gender)

2. Query data based on conditions:

   student = Student.select().where(Student.name == '张三').first()
   print(student.name, student.age, student.gender)

6. Update data
In ThinkORM, we can update data in the following ways:

student = Student.select().where(Student.name == '张三').first()
student.name = '李四'
student.save()

In the above code, we first query the data to be updated based on the conditions data, then modify its properties, and finally call the save() method to save the modified data to the database.

7. Delete data
Using ThinkORM, we can easily delete data. Here are some common examples of delete operations:

1. Delete data based on conditions:

   Student.delete().where(Student.age < 18).execute()

2. Delete all data:

   Student.delete().execute()

Conclusion:
By using ThinkORM, we can easily implement the addition, deletion, modification and query functions of the database. This article introduces how to use ThinkORM to connect to the database, define models, insert data, query data, update data and delete data, and provides corresponding code examples. I hope this article can help you better understand and use ThinkORM, and play a role in actual development.

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