nitindhar7

@BindingAnnotation(BindPost.PostBinderFactory.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.PARAMETER})
public @interface BindPost {
    class PostBinderFactory implements BinderFactory {
        public Binder build(Annotation annotation) {
            return new Binder<BindPost, Post>() {
                public void bind(SQLStatement q, BindPost bind, Post post) {
                    Array array = q.getContext().getConnection().createArrayOf("varchar", post.getTags());
                    q.bind("title", post.getTitle());

nitindhar7

// Mapping a string array to `varchar[]` in Postgres
String[] tags = ...
Array array = q.getContext().getConnection().createArrayOf("varchar", tags);

nitindhar7

/**
 * name - column name
 * value - data to be bind to column
 * sqlType - SQL data type to map to
 */
bindBySqlType(String name, Object value, int sqlType)

nitindhar7

@SqlUpdate("INSERT INTO posts(title, tags) VALUES (:title, :tags)")
int createPost(@Bind("title") String title, @Bind("tags") List<String> tags);

nitindhar7

#!/usr/bin/env ruby

CODE_PATH = "/path/to/repos"
RUN_PATH = Dir.pwd
IGNORED_DIRS = [".", "..", "temp", "dont-search-in-here"]

Dir.entries(CODE_PATH).select do |f|
  begin
    if !IGNORED_DIRS.include? f
      Dir.chdir("#{CODE_PATH}/#{f}")

nitindhar7

mongo> db.sequences.find().pretty()
{
  "key": "orders",
  "counter": 3
},
{
  "key": "favorites",
  "counter": 15
},
...

nitindhar7

/*
 * processOrder(...); // orderNumber => 1
 * processOrder(...); // orderNumber => 2
 * ...
 */
public Order processOrder(...) {
  long orderNumber = getNext("orders");
  return createOrder(orderNumber, ...);
}

nitindhar7

/**
 * Assuming an entity class called 'Sequence' has been created to 
 * represent the sequence collection
 **/
public long getNext(String collection) {
    Sequence seq = datastore.findAndModify(
      datastore.find(Sequence.class, "key = ", collection), // query
      datastore.createUpdateOperations(Sequence.class).inc("counter") // update
    );

nitindhar7

{
  "key": "orders",
  "counter": 0
}

nitindhar7

val registerForm = Form(
  mapping(
    "email" -> nonEmptyText.verifying(emailCheckConstraint),
    "password" -> nonEmptyText.verifying(passwordCheckConstraint),
    "cities" -> optional(list(text)),
    "other_city" -> optional(text)
  )(RegisterForm.apply)(RegisterForm.unapply).verifying(citiesCheckConstraint)
)