使用Go语言连接和操作数据库的基本步骤

go get -u github.com/go-sql-driver/mysql

package main

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

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

func main() {
 // 定义连接字符串
 db, err := sql.Open("mysql", "user:password@tcp(127.0.0.1:3306)/dbname")
 if err != nil {
 log.Fatal(err)
 }
 defer db.Close()

 // 验证连接
 err = db.Ping()
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println("Connected to database successfully!")
}

package main

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

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

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

 // 执行查询
 rows, err := db.Query("SELECT id, name FROM users")
 if err != nil {
 log.Fatal(err)
 }
 defer rows.Close()

 // 遍历结果集
 for rows.Next() {
 var id int
 var name string
 err := rows.Scan(&id, &name)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Printf("ID: %d, Name: %s\n", id, name)
 }

 // 检查遍历过程中是否出现错误
 if err := rows.Err(); err != nil {
 log.Fatal(err)
 }
}

package main

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

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

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

 // 插入数据
 _, err = db.Exec("INSERT INTO users (name, age) VALUES (?, ?)", "Alice", 25)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println("Data inserted successfully!")

 // 更新数据
 _, err = db.Exec("UPDATE users SET age = ? WHERE id = ?", 30, 1)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println("Data updated successfully!")

 // 删除数据
 _, err = db.Exec("DELETE FROM users WHERE id = ?", 1)
 if err != nil {
 log.Fatal(err)
 }
 fmt.Println("Data deleted successfully!")
}