如何使用 gorm 执行跨越两个 mysql 数据库的联合查询？

Question

code like:

addr:=fmt.Sprintf(`%v:%v@tcp(%v:%v)/(%v,%v)?charset=utf8`, dbuser, dbpassword, dbhost, dbport, dbdatabase)

DB, err = gorm.Open("mysql", addr)

sql := "select * from db1.user join db2.salary"
 
rows, err := DB.Raw(sql).Rows()

it seems the method gorm.Open() only accept one source parameter, and it run error "unknown table name 'db1.user'"

is there a correct way to init the DB to excute the sql or other way to solve the problem?

many thanks

Answer 1

sovled by setting dbdatabase="", which it means giving null database name connecting to the mysql instance. And database name shoud be presented as prefix on table name in sql.