使用golang编写Web程序（四）

1、连接postgres数据库的服务端代码：

package main

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

    _ "github.com/lib/pq"
)

type authUser struct {
    UserLoginName string
    UserName      string
}

//IndexHandler 首页展示用户信息
func IndexHandler(w http.ResponseWriter, r *http.Request) {
    if r.Method == "GET" {
        dbUser := "postgres"
        dbPass := "mypassword"
        dbHost := "localhost"
        dbPort := "5432"
        dbName := "mydb"
        connStr := fmt.Sprintf("host=%s port=%s user=%s password=%s dbname=%s sslmode=disable", dbHost, dbPort, dbUser, dbPass, dbName)
        db, err := sql.Open("postgres", connStr)
        if err != nil {
            log.Fatal(err)
        }
        rows, err := db.Query("SELECT USER_LOGIN_NAME,USER_NAME FROM public.AUTH_USER")
        if err != nil {
            log.Println(err)
        }
        var authUsers []authUser
        for rows.Next() {
            var au authUser
            rows.Scan(&au.UserLoginName, &au.UserName)
            authUsers = append(authUsers, au)
        }
        t, err := template.ParseFiles("templates/index.html")
        if err != nil {
            log.Println(err)
        }
        err = t.Execute(w, authUsers)
        if err != nil {
            log.Println(err)
        }
    }
}

func main() {
    http.HandleFunc("/", IndexHandler)
    fmt.Println("服务端口:8000")                 //控制台输出信息
    err := http.ListenAndServe(":8000", nil) //设置监听的端口
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}

2、go语言渲染前端模板代码

<div>
    {{.}}
</div>