Question

我想在mysql数据库中查询值为IN切片的表：

var qids []int
//fill qids dynamically
err = database.SQL.Select(&quotes,
    "SELECT * FROM quote WHERE qid IN $1", qids)
if err != nil {
    log.Println(err)
}

但是我收到了这个错误：

sql: converting Exec argument #0's type: unsupported type []int, a slice
quotes []

我该如何解决这个问题？

Answer 1

sqlx有一个很好的帮手：In()我们只需要准备带有args和Rebind的查询，如下所示：

var qids []int

// fills qids on query dynamically
query, args, err := sqlx.In("SELECT * FROM quote WHERE qid IN (?)", qids)
if err != nil {
    log.Fatal(err)
}

// sqlx.In returns queries with the `?` bindvar, we can rebind it for our backend
//
query = database.SQL.Rebind(query)  // database.SQL should be a *sqlx.DB

err = database.SQL.Select(&quotes, query, args...)
if err != nil {
    log.Fatal(err)
}

// or just in one line:

err = database.SQL.Select(&quotes, database.SQL.Rebind(query), args...)

我还建议你看看这里：http://jmoiron.github.io/sqlx/有很多例子，包括 IN

Answer 2

嘿因为[] int
试试这个

type Int64Array []int64

// Value returns the driver compatible value
func (a Int64Array) Value() (driver.Value, error) {
var strs []string
for _, i := range a {
    strs = append(strs, strconv.FormatInt(i, 10))
}
return "{" + strings.Join(strs, ",") + "}", nil
}

然后将int64传递给查询

db.Queryx(“"SELECT * FROM quote WHERE qid IN $1", int64IDs)

了解详情，请查看here

Answer 3

标签表明您使用的是sqlx。它在查询中有support for IN。

所以你可以做到

var qids []int
//fill qids dynamically
rows, err = db.Query(&quotes, "SELECT * FROM quote WHERE qid IN ($1)", qids)
if err != nil {
    log.Println(err)
}
// scan the rows

如何使用sqlx在一个切片中查询mysql？

3 个答案: