duandao7704
duandao7704
2014-11-03 03:55

在Golang中将数组插入Postgresql数据库

已采纳

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);
}

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

  • 点赞
  • 写回答
  • 关注问题
  • 收藏
  • 复制链接分享
  • 邀请回答

2条回答

  • douyanning3724 douyanning3724 7年前

    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.
    }
    
    点赞 评论 复制链接分享
  • du512053619 du512053619 5年前

    Arrays are supported in github.com/lib/pq since 2016 Aug 6th. OP's statement could be written as:

    _, err := db.Exec(
        "INSERT INTO history VALUES ($1, $2, $3, $4)", 
        rand.Int63(), 
        pq.Array(t.productids),   // <------- 
        card.cid, 
        t.salepoint,
    )
    
    点赞 评论 复制链接分享