SQLer:无需编程语言即可将SQL查询转换为RESTful API的工具(6)

发布于2019-04-20 11:40:57

SQLer是一个微型http服务器,用Go语言编写,将旧的CGI概念应用于SQL查询。SQLer允许编写端点并分配一个SQL查询,以便任何人点击它时能执行查询。此外SQLer还允许自定义验证规则,可验证请求正文或查询参数。SQLer使用nginx样式配置语言(HCL)。

SQLer功能

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配置概况

// create a macro/endpoint called "_boot",
// this macro is private "used within other macros" 
// because it starts with "_".
// this rule only used within `RESTful` context.
_boot {
    // the query we want to execute
    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
}

// adduser macro/endpoint, just hit `/adduser` with
// a `?user_name=&user_email=` or json `POST` request
// with the same fields.
adduser {
    // what request method will this macro be called
    // default: ["ANY"]
    // this only used within `RESTful` context.
    methods = ["POST"]

    // authorizers,
    // sqler will attempt to send the incoming authorization header
    // to the provided endpoint(s) as `Authorization`,
    // each endpoint MUST return `200 OK` so sqler can continue, other wise,
    // sqler will break the request and return back the client with the error occurred.
    // each authorizer has a method and a url.
    // this only used within `RESTful` context.
    authorizers = ["GET http://web.hook/api/authorize", "GET http://web.hook/api/allowed?roles=admin,root,super_admin"]

    // the validation rules
    // you can specify separated rules for each request method!
    rules {
        user_name = ["required"]
        user_email =  ["required", "email"]
        user_password = ["required", "stringlength: 5,50"]
    }

    // the query to be executed
    exec = <<SQL
       {{ template "_boot" }}

        /* let's bind a vars to be used within our internal prepared statement */
        {{ .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
}

// list all databases, and run a transformer function
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
}

支持的SQL引擎

支持的 Util

协议

SQLer遵循 Apache 2.0协议。