How to use MySQL and C++ to develop a simple email sending function

How to use MySQL and C to develop a simple email sending function

Abstract: This article will introduce how to use the C programming language to develop a simple email based on the MySQL database. Email sending function. The article mainly includes the following aspects: database design, C code implementation and implementation of email sending function.

1. Database design
In the MySQL database, we need to create at least two tables to store email-related information. The first table is used to store user information, including user ID, user name, password, etc. The second table is used to store the content of the email, including email ID, sender ID, recipient ID, email subject and email content, etc.

The SQL statement to create the user information table is as follows:

CREATE TABLE user (
  id INT PRIMARY KEY AUTO_INCREMENT,
  username VARCHAR(50) NOT NULL,
  password VARCHAR(50) NOT NULL
);

The SQL statement to create the email content table is as follows:

CREATE TABLE mail (
  id INT PRIMARY KEY AUTO_INCREMENT,
  sender_id INT,
  receiver_id INT,
  subject VARCHAR(100) NOT NULL,
  content TEXT NOT NULL,
  FOREIGN KEY (sender_id) REFERENCES user(id),
  FOREIGN KEY (receiver_id) REFERENCES user(id)
);

2. C code implementation

1. First, we need to use the C MySQL connection library to connect to the database. As shown below:

   #include <mysql_driver.h>
   #include <mysql_connection.h>
   using namespace std;
   using namespace sql;

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2. In the C code, we need to write functions to connect to the database and execute SQL statements. The following is an example of connecting to the database:

   cppsql::mysql::MySQL_Driver *driver;
   cppsql::mysql::MySQL_Connection *con;
   cppsql::mysql::MySQL_Statement *stmt;
   cppsql::mysql::MySQL_Resultset *res;
   
   driver = cppsql::mysql::get_mysql_driver_instance();
   con = driver->connect("tcp://127.0.0.1:3306", "root", "password");
   stmt = con->createStatement();

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3. Next, we can use C code to implement the email sending function. The following is an example of a simple email sending function:

   void sendMail(int senderID, int receiverID, string subject, string content) {
     string sql = "INSERT INTO mail (sender_id, receiver_id, subject, content) VALUES (" + to_string(senderID) + ", " + to_string(receiverID) + ", '" + subject + "', '" + content + "')";
     stmt->execute(sql);
   }

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3. Implementation of the email sending function
In the C code, we can send emails by calling the sendMail function. . The following is an example:

sendMail(1, 2, "Hello", "This is a test email.");

The above code will send an email to the user with ID 2, with the subject "Hello" and the content "This is a test email."

Summary: This article introduces how to use MySQL and C to develop a simple email sending function. Through reasonable database design and implementation using C code, we can implement a basic email sending function.

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