Upsert postgresql 返回 id

Question

最初我认为这是一个 heroku 问题，由于某种奇怪的原因，这段代码在本地运行良好，但经过进一步调查，我意识到 id 一直返回 0。本质上，我正在尝试编写一个返回 id 的 upsert。我正在使用 sql 库。

-- ----------------------------
--  Table structure for books
-- ----------------------------
DROP TABLE IF EXISTS "public"."books" CASCADE;
CREATE TABLE "public"."books" (
    "id" serial primary key,
    "title" varchar(255) NOT NULL COLLATE "default",
    "first" varchar(40) NOT NULL COLLATE "default",
    "last" varchar(40) NOT NULL COLLATE "default",
    "class" varchar(40) NOT NULL COLLATE "default"
)
WITH (OIDS=FALSE);
-- ----------------------------
--  Table structure for bookitems
-- ----------------------------
DROP TABLE IF EXISTS "public"."bookitem";
CREATE TABLE "public"."bookitem" (

    "id" serial primary key,
    "price" int NOT NULL,
    "condition" int NOT NULL,
    "views" int NOT NULL,
    "seller" bigint NOT NULL,
    "book" int REFERENCES books(id),
    "saletype" int NOT NULL,
    "date" bigint NOT NULL,
    "description" varchar(255) NOT NULL COLLATE "default",
    "bucket" int NOT NULL,
    "status" int NOT NULL --This is for showing what the staus of the item is (bought sold etc.)
    --FOREIGN KEY (book) REFERENCES books(id)
)
WITH (OIDS=FALSE);

这里是触发错误的代码：

rows, err := db.Query(`with vals as (
      select $1::VARCHAR as title, $2::VARCHAR as first, $3::VARCHAR as last, $4::VARCHAR as class
    )
    insert into books (title, first, last, class)
    select v.title, v.first, v.last, v.class
    from vals as v
    where not exists (select * from books as t where t.title = v.title and t.last = v.last and t.first = v.first and t.class = v.class)
    RETURNING id`, r.FormValue("title"),
            r.FormValue("first"),
            r.FormValue("last"),
            r.FormValue("class"))
        //defer rows.Close()
        rows.Scan(&id)

        PanicIf(err)

        _, err = db.Query("INSERT INTO bookitem (price, condition, views, seller, book, saletype,   date, description, bucket, status) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10)",
            r.FormValue("price"),
            r.FormValue("condition"),
            0,
            0,
            id,
            r.FormValue("saletype"),
            0,
            r.FormValue("description"),
            0,
            0)

        PanicIf(err)

我运行它部署到heroku时遇到的错误是：

pq: insert or update on table "bookitem" violates foreign key constraint"bookitem_book_fkey"

在这一点上，任何建议都将不胜感激，因为我已尝试两次解决此问题，但均无济于事。

附：感谢所有帮助我意识到问题是我的代码而不是 heroku 的人！

Answer 1

因此将其更改为 QueryRow 解决了我的问题。我相信它必须与并发问题有关。希望这对未来的人有用。