Go-gin的基本使用

之前瞭解到了golang中使用較多的gin框架，所以在這裏貼一個簡單的demo，便於記錄，代碼如下：

package main

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

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

type Person struct {
	Id        int    `json:"id" form:"id"`
	FirstName string `json:"first_name" form:"first_name"`
	LastName  string `json:"last_name" form:"last_name"`
}

func main() {
	db, err := sql.Open("mysql", "root:@tcp(127.0.0.1:3306)/test?parseTime=true")
	defer db.Close()
	if err != nil {
		log.Fatalln(err)
	}
	db.SetMaxIdleConns(20)
	db.SetMaxOpenConns(20)
	if err := db.Ping(); err != nil {
		log.Fatalln(err)
	}
	router := gin.Default()
	router.GET("/", func(c *gin.Context) {
		c.String(http.StatusOK, "It works")
	})

	router.GET("/insert", func(c *gin.Context) {
		firstName := c.Request.FormValue("first_name")
		lastName := c.Request.FormValue("last_name")
		rs, err := db.Exec("INSERT INTO person(first_name, last_name) VALUES (?, ?)", firstName, lastName)
		if err != nil {
			log.Fatalln(err)
		}
		id, err := rs.LastInsertId()
		if err != nil {
			log.Fatalln(err)
		}
		fmt.Println("insert person Id {}", id)
		msg := fmt.Sprintf("insert successful %d", id)
		c.JSON(http.StatusOK, gin.H{"msg": msg})
	})

	router.GET("/query", func(c *gin.Context) {
		rows, err := db.Query("SELECT id, first_name, last_name FROM person")
		defer rows.Close()
		if err != nil {
			log.Fatalln(err)
		}
		persons := make([]Person, 0)
		for rows.Next() {
			var person Person
			rows.Scan(&person.Id, &person.FirstName, &person.LastName)
			persons = append(persons, person)
		}
		if err = rows.Err(); err != nil {
			log.Fatalln(err)
		}
		c.JSON(http.StatusOK, gin.H{
			"persons": persons,
		})
	})

	router.Run(":8080")
}

如代碼所示，實現一個簡單的數據插入與查詢的功能，服務監聽8080端口。