How to develop a simple batch rename function using MySQL and C++

How to use MySQL and C to develop a simple batch rename function

Introduction:
In daily work and life, we often encounter the need to Batch files are renamed. To improve efficiency, we can develop a simple batch rename function to automate processing. This article will introduce how to develop such a function using MySQL and C, and provide specific code examples.

1. Requirement analysis:
   Before developing the batch renaming function, we need to clarify the specific requirements of the function, for example:
2. The user needs to provide a folder path, and the program will Traverse all files under this path.
3. The program needs to provide a rule for renaming files.
4. Users can choose whether to overwrite existing files.

5. Database design:
   In order to implement such a function, we need to use a MySQL database to store the original path and new path of the file. The following is the design of the database:

   CREATE TABLE file_rename (
    id INT PRIMARY KEY AUTO_INCREMENT,
    original_path VARCHAR(255) NOT NULL,
    new_path VARCHAR(255) NOT NULL
   );

6. Code implementation:
   Next, we will use C to implement the batch renaming function.

3.1 Traverse the folder:
First, we need to traverse the folder path provided by the user and store all the file information into a vector. The following is a code example for traversing a folder:

#include <dirent.h>
#include <vector>

void listFiles(const char* path, std::vector<std::string>& files) {
    DIR* dir;
    struct dirent* entry;
    dir = opendir(path);

    if (dir != NULL) {
        while ((entry = readdir(dir)) != NULL) {
            if (entry->d_type == DT_REG) {
                files.push_back(std::string(entry->d_name));
            }
        }
        closedir(dir);
    }
}

3.2 File renaming:
Next, we need to rename the file according to the rules provided by the user and store the original path and the new path to in the database. The following is a code example for file renaming:

#include <iostream>
#include <mysql/mysql.h>

void renameFiles(std::vector<std::string>& files, const std::string& rule, const std::string& folderPath) {
    // Connect to MySQL database
    MYSQL* conn;
    conn = mysql_init(NULL);
    if (conn == NULL) {
        std::cerr << "Failed to initialize MySQL connection." << std::endl;
        return;
    }
    if (mysql_real_connect(conn, "localhost", "username", "password", "database", 0, NULL, 0) == NULL) {
        std::cerr << "Failed to connect to MySQL database." << std::endl;
        return;
    }

    // Generate new names and rename files
    for (const std::string& file : files) {
        std::string newFileName = // generate new file name based on rule
        std::string oldFilePath = folderPath + "/" + file;
        std::string newFilePath = folderPath + "/" + newFileName;

        // Rename file
        if (rename(oldFilePath.c_str(), newFilePath.c_str()) != 0) {
            std::cerr << "Failed to rename file " << file << "." << std::endl;
        }

        // Insert data into MySQL database
        std::string query = "INSERT INTO file_rename (original_path, new_path) VALUES ('" + oldFilePath + "', '" + newFilePath + "')";
        if (mysql_query(conn, query.c_str()) != 0) {
            std::cerr << "Failed to insert data into MySQL database." << std::endl;
        }
    }

    // Close MySQL connection
    mysql_close(conn);
}

4. Improvement and expansion:
   The above code implements a simple batch rename function, but there is still some room for improvement and expansion:
5. Add error handling: Add appropriate error handling to the code so that errors that may occur can be caught and handled.
6. Add user interaction: Add an interactive interface to the program, allowing users to enter information such as folder paths, rules, etc., and provide a more friendly operating experience.
7. Batch rename record query: Add query function in the program, you can query rename records based on the original path of the file or the new path.

Conclusion:
This article introduces how to use MySQL and C to develop a simple batch rename function. By traversing folders and renaming files, we can batch rename multiple files at one time to improve work efficiency. At the same time, the database records the original path and new path of the file to facilitate future query and management. I hope this article will help you develop similar functions.

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