How does Go language implement the addition, deletion, modification and query operations of the database?

Go language is an efficient, concise and easy-to-learn programming language. It is favored by developers because of its advantages in concurrent programming and network programming. In actual development, database operations are an indispensable part. This article will introduce how to use Go language to implement database addition, deletion, modification and query operations.

In Go language, we usually use third-party libraries to operate databases, such as the commonly used sql package, gorm, etc. Here we take the sql package as an example to introduce how to implement the addition, deletion, modification and query operations of the database. Assume we are using a MySQL database.

First, we need to import the two packages database/sql and github.com/go-sql-driver/mysql. Then open the database connection through the sql.Open method:

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

func main() {
    db, err := sql.Open("mysql", "username:password@tcp(127.0.0.1:3306)/dbname")
    if err != nil {
        log.Fatal(err)
    }
    defer db.Close()
}

Next, we will implement the addition, deletion, modification and query operations of the database. The following describes how to insert data, delete data, update data and query data respectively:

1. Insert data:

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

2. Delete data:

func deleteData(db *sql.DB, id int) error {
    _, err := db.Exec("DELETE FROM users WHERE id = ?", id)
    return err
}

3. Update data:

func updateData(db *sql.DB, id int, name string, age int) error {
    _, err := db.Exec("UPDATE users SET name = ?, age = ? WHERE id = ?", name, age, id)
    return err
}

4. Query data:

func queryData(db *sql.DB, id int) (string, int, error) {
    var name string
    var age int
    err := db.QueryRow("SELECT name, age FROM users WHERE id = ?", id).Scan(&name, &age)
    return name, age, err
}

Through the above code example, we have implemented the addition, deletion, modification and query of the database operate. In actual projects, these methods can be further encapsulated as needed, and functions such as error handling and parameter verification can be added to ensure the security and stability of database operations.

To summarize, it is not complicated to use Go language to implement database addition, deletion, modification and query operations. With the database/sql package, you can easily connect and operate various types of databases. If you need more advanced functions or performance in actual projects, you can also consider using ORM libraries such as gorm, etc. I hope the above content will help you understand how to implement database operations in Go language.

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