英文:
how to get the location of the current file in revel
问题
我正在使用golang revel web框架，并尝试在当前工作目录中创建一个sqlite数据库。
model.go
func New(dbName string, table string) *Db {
_, filename, _, _ := runtime.Caller(1)
db, err := sql.Open("sqlite3", path.Join(path.Dir(filename), dbName))
if err != nil {
log.Fatal(err)
}
err = db.Ping()
if err != nil {
log.Panic(err)
}
database := &Db{Database: db}
_, err = db.Exec("create table %s" +
"( id integer primary key, " +
"name varchar(100)," +
"email varchar(100)," +
"branch varchar(100)," +
"help varchar(100))")
if err != nil {
log.Fatal(err)
}
}
我已经编写了一个测试，只是调用了这个函数。
每当我使用revel test运行测试，或者通过访问localhost:9000/@tests运行测试时，函数会引发Panic，并显示错误消息无法打开数据库文件。
发生这种情况的原因是runtime.Caller(1)返回的filename是/usr/local/go/src/runtime/asm_amd64.s，程序对其没有权限。
即使我直接写入./foo.db，错误仍然显示。
我尝试了os.Getwd()，它返回空字符串。
我还尝试了filepath.Abs(filepath.Dir(os.Args[0]))，但它返回的是/home/girish/GoProjects/bin/revel.d，这是revel二进制文件的位置。
那么找到model.go所在目录的最佳方法是什么？
英文:
I am using golang revel web framework and
I am trying to create a sqlite db in the current working directory.
model.go
func New(dbName string,table string) *Db {
_,filename,_,_ := runtime.Caller(1)
db , err := sql.Open("sqlite3",path.Join(path.Dir(filename),dbName))
if err != nil {
log.Fatal(err)
}
err = db.Ping()
if err != nil {
log.Panic(err)
}
database := &Db{Database:db}
_,err = db.Exec("create table %s" +
"( id integer primary key, " +
"name varchar(100),"+
"email varchar(100),"+
"branch varchar(100),"+
"help varchar(100)",)
if err != nil {
log.Fatal(err)
}
}
I have a test in place which just calls this function.
whenever i run the test using revel test or by going to the localhost:9000/@tests, the function Panics and the error message is
cannot open the database file.
The reason that is happening is because the filename returned by runtime.Caller(1) is /usr/local/go/src/runtime/asm_amd64.s for which the program has no permission.
if i directly write ./foo.db, even then the error shows.
I tried os.Getwd() which return empty string.
I also tried filepath.Abs(filepath.Dir(os.Args[0]))
but that returned /home/girish/GoProjects/bin/revel.d which is the revel binary.
So whats the best way to find the directory of the model.go?
答案1
得分: 1
在运行时获取model.go文件的目录并没有意义，因为编译后的可执行文件可能位于完全不同的文件系统上。
您可能想要获取正在运行的可执行文件的目录：
dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
dir将是程序在运行时所在的文件夹。
英文:
It doesn't make sense to get the directory of the model.go file at runtime, because the compiled executable could be on a completely different filesystem.
You may want to get the directory of where the running executable was started from:
dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
dir will be the folder where the program lives at runtime.
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