go iris学习日记（二） go iris连接mysql并返回

承接上一篇go iris框架的文章， 最近想用它来写一个服务端。话不多说， 直接上代码。
首先创建main.go文件。

package main

import (
    "database/sql"
    "fmt"
    "github.com/dgrijalva/jwt-go"
    _ "github.com/go-sql-driver/mysql"
    "github.com/iris-contrib/middleware/cors"
    jwtmiddleware "github.com/iris-contrib/middleware/jwt"
    "github.com/kataras/iris"
    "time"
)

type Token struct {
    Token string `json:"token"`
}

func myHandler(ctx iris.Context) {
    user := ctx.Values().Get("jwt").(*jwt.Token)
    ctx.JSON(user)
}

func checkErr(err error) {

    if err != nil {

        panic(err)

    }

}
func main() {
    //打开数据库mytest

    fmt.Println("open the database, myDatabase")

    db, err := sql.Open("mysql", "数据库账号:数据库密码@tcp(数据库Ip:端口)/数据库名称?parseTime=true")

    if err != nil {
        fmt.Println(err)
    }

    //关闭数据库，db会被多个goroutine共享，可以不调用
    defer db.Close()
    //查询数据，指定字段名，返回sql.Rows结果集
    rows, _ := db.Query("select USER_NAME,USER_PASS from taskusers")
    id := 0
    name := ""
    for rows.Next() {
        rows.Scan(&id, &name)
        fmt.Println(id, name)
    }

    //查询数据，取所有字段
    rows2, _ := db.Query("select * from taskusers")
    //返回所有列
    cols, _ := rows2.Columns()
    //这里表示一行所有列的值，用[]byte表示
    vals := make([][]byte, len(cols))
    //这里表示一行填充数据
    scans := make([]interface{}, len(cols))
    //这里scans引用vals，把数据填充到[]byte里
    for k, _ := range vals {
        scans[k] = &vals[k]
    }

    i := 0
    result := make(map[int]map[string]string)
    for rows2.Next() {
        //填充数据
        rows2.Scan(scans...)
        //每行数据
        row := make(map[string]string)
        //把vals中的数据复制到row中
        for k, v := range vals {
            key := cols[k]
            //这里把[]byte数据转成string
            row[key] = string(v)
        }
        //放入结果集
        result[i] = row
        i++
    }
    fmt.Println(result)

    //查询一行数据
    rows3 := db.QueryRow("select id,name from taskusers where id = ?", 1)
    rows3.Scan(&id, &name)
    fmt.Println(id, name)
    app := iris.New()
    crs := cors.New(cors.Options{
        AllowedOrigins:   []string{"*"}, // allows everything, use that to change the hosts.
        AllowCredentials: true,
        AllowedMethods:   []string{"PUT", "PATCH", "GET", "POST", "OPTIONS"},
        AllowedHeaders:   []string{"Origin", "Authorization"},
        ExposedHeaders:   []string{"Accept", "Content-Type", "Content-Length", "Accept-Encoding", "X-CSRF-Token", "Authorization"},
    })
    v1 := app.Party("/api/v1", crs).AllowMethods(iris.MethodOptions) // <- important for the preflight.
    {
        v1.Post("/login", func(ctx iris.Context) {
            token := jwt.New(jwt.SigningMethodHS256)
            claims := make(jwt.MapClaims)
            claims["exp"] = time.Now().Add(time.Hour * time.Duration(1)).Unix()
            claims["iat"] = time.Now().Unix()
            token.Claims = claims
            tokenString, err := token.SignedString([]byte("My Secret"))
            if err != nil {
            }
            response := Token{tokenString}

            ctx.JSON(response)
        })
        v1.Get("/about", func(ctx iris.Context) {
            ctx.JSON(result)
        })
        v1.Post("/send", func(ctx iris.Context) {
            ctx.WriteString("sent")
        })
        v1.Put("/updated", func(ctx iris.Context) {
            ctx.WriteString("updated")
        })
        v1.Delete("/deleted", func(ctx iris.Context) {
            ctx.WriteString("deleted")
        })
        jwtHandler := jwtmiddleware.New(jwtmiddleware.Config{
            ValidationKeyGetter: func(token *jwt.Token) (interface{}, error) {
                return []byte("My Secret"), nil
            },
            SigningMethod: jwt.SigningMethodHS256,
        })

        v1.Use(jwtHandler.Serve)
        v1.Get("/ping", myHandler)
    }
    app.Run(iris.Addr("localhost:3001"))

}

之后执在控制台执行go run main.go，执行的过程中可能会报找不到相应的包的错， 执行‘go get xxx’即可， 最后浏览器访问localhost:3001并加上相应路径即可。