在Golang中将数组插入Postgresql数据库

问题描述：

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

我希望能够将bigints数组写入要用于Go中历史记录的表中。不幸的是，当我执行错误sql：转换Exec参数＃1的类型：不支持的类型[] int64时，会抛出切片 code>。为简化起见，以下是我正在做的事情： p>

  type Card struct {
 cid int64 
} 
 
type Transaction struct {
 tid，cardid int64 \  n productids [] int64 
 salepoint int 
 cardkey string 
} 
 
func logPurchase（card * Card，t * Transaction）{
 _，err：= db.Exec（“插入历史记录值（$ 1，  $ 2，$ 3，$ 4）”，rand.Int63（），t.productids，card.cid，t.salepoint）; 
} 
  code>  pre> 
 
  我想插入的表的结构：
  tid bigint主键，productids bigint []不为空，cardid bigint不为空，salespoint int  code>  p> 
  div>

答

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.
}

答

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,
)

在Golang中将数组插入Postgresql数据库

相关推荐