sqler 对于sql Sanitization 的处理，我们可以使用bind 指令
说明： 这个是2.0 的功能，注意版本的使用
参考格式
addpost {
// $input is a global variable holds all request inputs,
// including the http headers too (prefixed with `http_`)
// all http header keys are normalized to be in this form
// `http_x_header_example`, `http_authorization` ... etc in lower case.
bind {
title = "$input.post_title"
content = "$input.post_content"
user_id = "$input.post_user"
}
exec = <<SQL
INSERT INTO posts(user_id, title, content) VALUES(:user_id, :title, :content);
SELECT * FROM posts WHERE id = LAST_INSERT_ID();
SQL
}