如何使用sqlx在切片中查询mysql？

问题描述

我想在mysql数据库中查询表 IN 切片：

I want to query a table in mysql database for values IN a slice:

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)
}

但我得到这个错误：

But I get this error:

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

我该如何解决这个问题？

How can I fix this?

推荐答案

sqlx有一个很好的帮手：中，我们只需要准备以参数和Rebind为参数的查询，如下所示：

sqlx has a great helper for that: In() we just have to prepare the query taking the args and Rebind, like this:

var qids []int
// fill qids dynamically

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

另外我建议你看看这里：有很多例子，包括 IN

Also I recommend you take a look here: http://jmoiron.github.io/sqlx/ there're a lot of examples including IN

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