将数组插入Postgresql数据库 [英] Inserting an array into a Postgresql database

问题描述

我希望能够将bigints数组写入要用于Go历史记录的表中。不幸的是，当我出现错误 sql：转换Exec参数＃1的类型：不受支持的类型[] int64时，会引发切片。为简化起见，以下是我正在做的事情：

I want to be able to write an array of bigints into a table that I am using for history in Go. Unfortunately, I can't and when I do the error sql: converting Exec argument #1's type: unsupported type []int64, a slice is thrown. Here's what I'm doing, edited for brevity:

type Card struct {
    cid int64
}

type Transaction struct {
        tid, cardid int64
        productids []int64
        salepoint int
        cardkey string
}

func logPurchase(card *Card, t *Transaction) {
     _, err := db.Exec("INSERT INTO history VALUES ($1, $2, $3, $4)", rand.Int63(), t.productids, card.cid, t.salepoint);
}

这是我要插入的表的结构：
tid bigint主键，productids bigint []不为空，cardid bigint不为空，salespoint int

This is the structure of the table that I wish to insert into: tid bigint primary key, productids bigint[] not null, cardid bigint not null, salepoint int

推荐答案

使用自定义类型实现数据库/sql/driver.Valuer：

Implement database/sql/driver.Valuer with a custom type:

type int64array []int64

func (a int64array) Value() (driver.Value, error) {
    // Format a in PostgreSQL's array input format {1,2,3} and return it as as string or []byte.
}

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