doutongxuan1614
doutongxuan1614
2017-11-24 21:02
浏览 132

Golang Postgresql数组

If I have a table that returns something like:

id: 1
names: {Jim, Bob, Sam}

names is a varchar array.

How do I scan that back into a []string in Go? I'm using lib/pg

Right now I have something like

rows, err := models.Db.Query("SELECT pKey, names FROM foo")
for rows.Next() {
            var pKey int
            var names []string
            err = rows.Scan(&pKey, &names)
}

I keep getting:

panic: sql: Scan error on column index 1: unsupported Scan, storing driver.Value type []uint8 into type *[]string

It looks like I need to use StringArray https://godoc.org/github.com/lib/pq#StringArray

But, I think I'm too new to Go to understand exactly how to use: func (a *StringArray) Scan(src interface{})

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1条回答 默认 最新

  • duanchong3075
    duanchong3075 2017-11-24 21:32
    已采纳

    You are right, you can use StringArray but you don't need to call the

    func (a *StringArray) Scan(src interface{})
    

    method yourself, this will be called automatically by rows.Scan when you pass it anything that implements the Scanner interface.

    So what you need to do is to convert your []string to *StringArray and pass that to rows.Scan, like so:

    rows, err := models.Db.Query("SELECT pKey, names FROM foo")
    for rows.Next() {
                var pKey int
                var names []string
                err = rows.Scan(&pKey, (*pq.StringArray)(&names))
    }
    
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