Go language and MySQL database: how to develop quickly?

With the rapid development of modern software development, choosing an efficient programming language and database system is very important for software development. The combination of Go language and MySQL database is the best choice for rapid development of high-performance software.

Go language is a programming language initiated by Google. It has the advantages of fast compilation and efficient execution, and can easily implement concurrent and high-throughput applications. The emergence of Go language has largely solved the concurrency and high-performance needs of modern software development.

The MySQL database is an open source data management system that is stable, reliable, feature-rich and easy to use. MySQL has high security and strong scalability, and has become one of the most widely used relational databases by users around the world.

Today, we will introduce how to quickly start the MySQL database when using the Go language, and how to use the MySQL database in the Go language project.

Step One: Install MySQL Database

Before using the MySQL database, you need to install it on your computer. Download link: https://dev.mysql.com/downloads/mysql/

You can choose some basic configurations during the installation process, but it should be noted that you need to enter the password of the root user during the installation of MySQL. , which is very important for subsequent use and needs to be kept properly.

Step 2: Connect to the MySQL database

Go language provides a variety of methods to connect to the MySQL database, the most common of which are based on the third-party packages "database/sql" and "mysql".

First, you need to use the "mysql" package to open the connection to the MySQL database:

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

func OpenDB(dsn string) (*sql.DB, error) {
   db, err := sql.Open("mysql", dsn)
   if err != nil {
      return nil, err
   }
   err = db.Ping()
   if err != nil {
      return nil, err
   }
   return db, nil
}

The "dsn" parameter here needs to be set to the complete URL to connect to the MySQL database, including user name, password, IP address and port number, etc. After successfully opening the connection, you can use "db.Exec", "db.Query" and other methods to execute SQL commands on the MySQL database.

Step 3: Use MySQL database

After using Go language to connect to the MySQL database, we can easily execute various types of SQL commands, including creating tables, inserting data, and querying data. wait.

For example, if you want to create a simple user table, you can use the following code:

CREATE TABLE users (
   id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
   name VARCHAR(30) NOT NULL,
   age INT NOT NULL
);

If you want to execute this SQL command in Go language, you can use the following code:

func CreateTable(db *sql.DB) {
   q := `
      CREATE TABLE IF NOT EXISTS users (
         id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
         name VARCHAR(30) NOT NULL,
         age INT NOT NULL
      )
   `
   db.Exec(q)
}

Similarly, if you want to insert a piece of user data in Go language, you can use the following code:

func InsertUser(db *sql.DB, name string, age int) error {
   q := `
      INSERT INTO users (name, age)
      VALUES (?, ?)
   `
   _, err := db.Exec(q, name, age)
   return err
}

If you want to query a piece of user data just inserted, you can use the following code:

func QueryUser(db *sql.DB, id int) (string, int, error) {
   q := `
      SELECT name, age FROM users WHERE id = ?
   `
   rows, err := db.Query(q, id)
   if err != nil {
      return "", 0, err
   }
   defer rows.Close()
   if rows.Next() {
      var name string
      var age int
      err = rows.Scan(&name, &age)
      if err != nil {
         return "", 0, err
      }
      return name, age, nil
   }
   return "", 0, sql.ErrNoRows
}

here The "db.Query" method was used to query the data, and the "rows.Scan" method was used to decode the results into the variables "name" and "age".

Summary

By using the combination of Go language and MySQL database, we can quickly implement high-performance, high-concurrency applications. Especially for applications that require large amounts of data storage, the efficient performance and reliability of the MySQL database can greatly improve the application experience.

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