How to use MySQL and Go language to develop a simple investment and financial management system

Using MySQL and Go language to develop a simple investment and financial management system

With the rise of Internet finance, investment and financial management have gradually become an important means for people to increase their wealth. When developing an investment and financial management system, MySQL serves as a powerful database management system, and the Go language is an efficient server-side programming language. Their combination can help developers build a safe, reliable, and high-performance system. This article will introduce how to use MySQL and Go language to develop a simple investment and financial management system, and provide specific code examples.

1. Build database

First, we need to create a database to store user information, investment projects and other data. This data can be easily managed using MySQL. The following is a simple user table design example:

CREATE TABLE IF NOT EXISTS user (
    id INT AUTO_INCREMENT PRIMARY KEY,
    username VARCHAR(255) NOT NULL,
    password VARCHAR(255) NOT NULL,
    email VARCHAR(255) NOT NULL,
    balance DECIMAL(10, 2) DEFAULT 0.0
);

2. Write Go code to connect to the database

Next, we need to use Go language to write code to connect to the database created in the previous step Database, and implement functions such as user registration and login. The following is a simple code example:

package main

import (
    "database/sql"
    "fmt"
    "log"

    _ "github.com/go-sql-driver/mysql"
)

const (
    DBUsername = "root"
    DBPassword = "password"
    DBHost     = "localhost"
    DBPort     = "3306"
    DBName     = "investments"
)

func main() {
    // 连接数据库
    db, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s:%s)/%s", DBUsername, DBPassword, DBHost, DBPort, DBName))
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()

    // 注册用户
    registerUser(db, "john", "password123", "john@example.com")

    // 登录
    user, err := loginUser(db, "john", "password123")
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Welcome, %s!
", user.Username)
}

// 注册用户
func registerUser(db *sql.DB, username, password, email string) error {
    stmt, err := db.Prepare("INSERT INTO user (username, password, email) VALUES (?, ?, ?)")
    if err != nil {
        return err
    }
    defer stmt.Close()

    _, err = stmt.Exec(username, password, email)
    return err
}

// 登录
func loginUser(db *sql.DB, username, password string) (*User, error) {
    var user User
    row := db.QueryRow("SELECT * FROM user WHERE username = ? AND password = ?", username, password)
    err := row.Scan(&user.ID, &user.Username, &user.Password, &user.Email, &user.Balance)
    if err != nil {
        return nil, err
    }
    return &user, nil
}

type User struct {
    ID       int
    Username string
    Password string
    Email    string
    Balance  float64
}

3. Implementing the investment project function

In addition to user management, a complete investment and financial management system also needs to implement the release of investment projects , purchase and other functions. We can store the investment project information in a separate table and associate it with the user using foreign keys. Only simple code examples are given here:

CREATE TABLE IF NOT EXISTS investment (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(255) NOT NULL,
    amount DECIMAL(10, 2) NOT NULL,
    user_id INT,
    FOREIGN KEY (user_id) REFERENCES user (id)
);

// 发布项目
func createInvestment(db *sql.DB, name string, amount float64) error {
    stmt, err := db.Prepare("INSERT INTO investment (name, amount, user_id) VALUES (?, ?, ?)")
    if err != nil {
        return err
    }
    defer stmt.Close()

    _, err = stmt.Exec(name, amount, userID)
    return err
}

// 购买项目
func buyInvestment(db *sql.DB, investmentID, userID int) error {
    // 检查用户余额是否足够
    var balance float64
    row := db.QueryRow("SELECT balance FROM user WHERE id = ?", userID)
    err := row.Scan(&balance)
    if err != nil {
        return err
    }
    if balance < investmentAmount {
        return fmt.Errorf("Insufficient balance")
    }

    // 扣除购买金额
    _, err = db.Exec("UPDATE user SET balance = balance - ? WHERE id = ?", investmentAmount, userID)
    if err != nil {
        return err
    }

    // 将用户与投资项目关联
    _, err = db.Exec("UPDATE investment SET user_id = ? WHERE id = ?", userID, investmentID)
    return err
}

Through the above code examples, we have realized the basic functions of the investment and financial management system. Users can register, log in, publish items and purchase items. Through the powerful combination of MySQL and Go language, we can build a simple but fully functional investment and financial management system. Of course, this is just an example, and more complex functions and business logic may be required in actual development. I hope this article can help you further understand how to use MySQL and Go language for system development.

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