sqler sql 转rest api javascript 试用

sqler 内嵌了一个js 引擎的实现（基于goja,当我们配置了exec的配置之后
调用宏（redis 接口）或者rest api 的时候会有一个全局变量$result ，保存了执行的结果，我们可以
通过js 操作数据对象，比如进行数据改写，进行一些额外的数据控制。
同时默认的demo 配置的databases 宏就包含了js 调用的demo

环境准备

docker-compose 运行

• docker-compose 文件

 

version: "3"

services:

  sqler:

    image: dalongrong/sqler:1.6

    volumes:

    - "./config/config.example.hcl:/app/config.example.hcl"

    environment:

    - "DSN=root:dalongrong@tcp(mysqldb:3306)/test?multiStatements=true"

    ports:

    - "3678:3678"

    - "8025:8025"

  mysqldb:

    image: mysql:5.7.16

    ports:

      - 3306:3306

    command: --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci

    environment:

      MYSQL_ROOT_PASSWORD: dalongrong

      MYSQL_DATABASE: test

      MYSQL_USER: test

      MYSQL_PASSWORD: test

      TZ: Asia/Shanghai

 

 

• 配置说明

_boot {

    exec = <<SQL

        CREATE TABLE IF NOT EXISTS `users` (

            `ID` INT UNSIGNED AUTO_INCREMENT PRIMARY KEY,

            `name` VARCHAR(30) DEFAULT "@anonymous",

            `email` VARCHAR(30) DEFAULT "@anonymous",

            `password` VARCHAR(200) DEFAULT "",

            `time` INT UNSIGNED

        );

    SQL

}

allusers {

    methods = ["GET"]

    exec = <<SQL

        SELECT * FROM users;

    SQL

}

adduser {

    methods = ["POST"]

    rules {

        user_name = ["required"]

        user_email = ["required", "email"]

        user_password = ["required", "stringlength: 5,50"]

    }

    exec = <<SQL

        {{ template "_boot" }}

​

        /* let's bind a vars to be used within our internal prepared statment */

        {{ .BindVar "name" .Input.user_name }}

        {{ .BindVar "email" .Input.user_email }}

        {{ .BindVar "emailx" .Input.user_email }}

​

        INSERT INTO users(name, email, password, time) VALUES(

            /* we added it above */

            :name,

​

            /* we added it above */

            :email,

​

            /* it will be secured anyway because it is encoded */

            '{{ .Input.user_password | .Hash "bcrypt" }}',

​

            /* generate a unix timestamp "seconds" */

            {{ .UnixTime }}

        );

​

        SELECT * FROM users WHERE id = LAST_INSERT_ID();

    SQL

}

databases {

    exec = "SHOW DATABASES"

​

    transformer = <<JS

        // there is a global variable called `$result`,

        // `$result` holds the result of the sql execution.

        (function(){

            newResult = []

​

            for ( i in $result ) {

                newResult.push($result[i].Database)

            }

​

            return newResult

        })()

    JS

}

usersinfo {

  exec = "select * from users"

  transformer = <<JS

    // do some convert only print name && email

    (function(){

       var newResult=[];

       for (var item in $result) {

        var user = {

            user_name:$result[item].name,

            user_email:$result[item].email

        }

        newResult.push(user)

       }

       return newResult; 

    })()

  JS

​

}

 

 

• 说明
  官方demo 的databases 是一个，usersinfo 是我自己写的一个简单demo，进行查询数据的处理

启动&&测试

• 启动

 

docker-compose up -d

 

• 添加数据

curl -X POST \

  http://localhost:8025/adduser \

  -H 'Content-Type: application/json' \

  -H 'Postman-Token: a7784ea1-9f50-46ee-92ac-1d850334f3f1' \

  -H 'cache-control: no-cache' \

  -d '{

    "user_name":"dalong",

    "user_email":"1141591465@qq.com",

    "user_password":"dalongdemo"

}'

 

 

• 查询效果

curl -i http://localhost:8025/usersinfo

HTTP/1.1 200 OK

Access-Control-Allow-Origin: *

Content-Type: application/json; charset=UTF-8

Vary: Origin

Vary: Accept-Encoding

Date: Fri, 11 Jan 2019 03:35:44 GMT

Content-Length: 137

​

{"data":[{"user_name":"dalong","user_email":"1141591465@qq.com"},{"user_name":"dalong","user_email":"1141591465@qq.com"}],"success":true}% 

 

 

说明

$result 是全局定义的，从源码也可以看出来

if transformer == "" {

        return data, nil

    }

    vm := goja.New()

​

    vm.Set("$result", data)

​

    v, err := vm.RunString(transformer)

    if err != nil {

        return nil, err

    }

​

    return v, nil

参考资料

https://github.com/alash3al/sqler/blob/master/macro.go
https://github.com/rongfengliang/sqler-docker-compose