您可以在Golang中使用SQLite ATTACH和DETACH吗

问题描述：

I am using https://github.com/mattn/go-sqlite3 in a Golang application. I need to use multiple databases, and was wondering whether I can use ATTACH and DETACH in Golang (http://sqlite.org/lang_attach.html).

I don't have any code right now, because I don't know how else to tackle this problem except creating two database connections and joining data in the application:

db1, err := sql.Open("sqlite3", "./db1.db")

db2, err := sql.Open("sqlite3", "./db2.db")

// query db1 and db2
// put into map
// join data

It would be much easier if you could use:

attach database database1.db as db1;
attach database database2.db as db2;

select
  *
from
  db1.SomeTable a
    inner join 
  db2.SomeTable b on b.SomeColumn = a.SomeColumn;

我正在使用 https://github.com/mattn/go-sqlite3 在Golang应用程序中。我需要使用多个数据库，并且想知道是否可以在Golang中使用ATTACH和DETACH（ http://sqlite.org /lang_attach.html ）。 p>

我现在没有任何代码，因为除了创建两个数据库连接并加入连接之外，我不知道如何解决此问题应用程序中的数据： p>

  db1，err：= sql.Open（“ sqlite3”，“ ./db1.db")

db2，err：= sql。 打开（“ sqlite3”，“ ./ db2.db”）
 
 //查询db1和db2 
 //放入地图
 //连接数据
  code>  pre> 
 \  n 使用以下方法会容易得多： p> 
 
 
 将数据库database1.db附加为db1； 
将数据库database2.db附加为db2； 
 
select \  n * 
from 
 db1.SomeTable a 
内部联接
 db2.someTable b在b.SomeColumn = a.SomeColumn; 
  code>  pre> 
  div>

答

You can attach a database, you would do it in SQL after opening the first database (omit error check for brevity):

db1, err := sql.Open("sqlite3", "./db1.db")
defer db1.Close()

s := "attach database '/path/to/db2.db' as db2;"

_, err = db.Exec(s)

s = `select *
     from db1.SomeTable a
     inner join db2.SomeTable b on b.SomeColumn = a.SomeColumn; `

results, err := db.Query(s)
defer results.Close()

//process results ...

_, err = db.Exec("detach database db2;")

您可以在Golang中使用SQLite ATTACH和DETACH吗

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