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Proper error handling when no entity is found
Error handling in C codeCan I try/catch a warning?Proper Repository Pattern Design in PHP?Pointers vs. values in parameters and return valuesMultiple values in single-value contextHow do I handle nil return values from database?golang datastore projection query returning empty strings from a populated entityIs it idiomatic in go to handle all returned errors?Google cloud datastore + golang + embedded entitiesGolang error handling from function and caller to the terminal
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I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.
I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?
I know google's datastore returns error when no entity is found.
Right now I'm using gorm and it also returns error when no entity is found.
I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?
database go error-handling
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
add a comment |
I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.
I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?
I know google's datastore returns error when no entity is found.
Right now I'm using gorm and it also returns error when no entity is found.
I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?
database go error-handling
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
1
There is no "best practice" here. Only opinion. Do what makes sense for your application.
– Flimzy
Mar 27 at 11:21
"can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type,nilis a valid value for that type. As to whether you should, that's purely opinion-based.
– Adrian
Mar 27 at 13:19
add a comment |
I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.
I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?
I know google's datastore returns error when no entity is found.
Right now I'm using gorm and it also returns error when no entity is found.
I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?
database go error-handling
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
I'm writing a Go application which has a database package. Now in database package there are a couple of methods which you can call for getting an entity based on some fields.
I was wondering what is the best practice for error handling in Go when no entity is found. Should I return errors in my own database package or return nil as the value?
I know google's datastore returns error when no entity is found.
Right now I'm using gorm and it also returns error when no entity is found.
I'm wondering you can simply return nil as the value instead of returning an error. Am I missing a point?
database go error-handling
database go error-handling
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
edited Mar 27 at 8:58
Abdullah
1,0711 gold badge7 silver badges18 bronze badges
1,0711 gold badge7 silver badges18 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
asked Mar 27 at 8:32
Mohi_kMohi_k
26 bronze badges
26 bronze badges
1
There is no "best practice" here. Only opinion. Do what makes sense for your application.
– Flimzy
Mar 27 at 11:21
"can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type,nilis a valid value for that type. As to whether you should, that's purely opinion-based.
– Adrian
Mar 27 at 13:19
add a comment |
1
There is no "best practice" here. Only opinion. Do what makes sense for your application.
– Flimzy
Mar 27 at 11:21
"can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type,nilis a valid value for that type. As to whether you should, that's purely opinion-based.
– Adrian
Mar 27 at 13:19
1
1
There is no "best practice" here. Only opinion. Do what makes sense for your application.
– Flimzy
Mar 27 at 11:21
There is no "best practice" here. Only opinion. Do what makes sense for your application.
– Flimzy
Mar 27 at 11:21
"can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type,
nil is a valid value for that type. As to whether you should, that's purely opinion-based.– Adrian
Mar 27 at 13:19
"can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type,
nil is a valid value for that type. As to whether you should, that's purely opinion-based.– Adrian
Mar 27 at 13:19
add a comment |
2 Answers
2
active
oldest
votes
If you are using gorm, there is a function specifically for that; namely,
// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool
You can use it as following:
err = db.Find(object).Error
if err != nil
if gorm.IsRecordNotFoundError(err)
// handle object not found
else
return err
and for your question:
I'm wondering you can simply return nil as the value instead of returning an error
It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
add a comment |
you can use this code:
user:=&User
if db.First(&user, "username=?", mobile).RecordNotFound()
return nil
return user
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
If you are using gorm, there is a function specifically for that; namely,
// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool
You can use it as following:
err = db.Find(object).Error
if err != nil
if gorm.IsRecordNotFoundError(err)
// handle object not found
else
return err
and for your question:
I'm wondering you can simply return nil as the value instead of returning an error
It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
add a comment |
If you are using gorm, there is a function specifically for that; namely,
// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool
You can use it as following:
err = db.Find(object).Error
if err != nil
if gorm.IsRecordNotFoundError(err)
// handle object not found
else
return err
and for your question:
I'm wondering you can simply return nil as the value instead of returning an error
It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
add a comment |
If you are using gorm, there is a function specifically for that; namely,
// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool
You can use it as following:
err = db.Find(object).Error
if err != nil
if gorm.IsRecordNotFoundError(err)
// handle object not found
else
return err
and for your question:
I'm wondering you can simply return nil as the value instead of returning an error
It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
If you are using gorm, there is a function specifically for that; namely,
// IsRecordNotFoundError returns true if error contains a RecordNotFound error
func IsRecordNotFoundError(err error) bool
You can use it as following:
err = db.Find(object).Error
if err != nil
if gorm.IsRecordNotFoundError(err)
// handle object not found
else
return err
and for your question:
I'm wondering you can simply return nil as the value instead of returning an error
It really depends on your design; so if you want to separate your database layer, then you should still inform the user about this error using your own exported error type and let them handle it as they wish.
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
edited Mar 27 at 8:48
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
answered Mar 27 at 8:42
AbdullahAbdullah
1,0711 gold badge7 silver badges18 bronze badges
1,0711 gold badge7 silver badges18 bronze badges
add a comment |
add a comment |
you can use this code:
user:=&User
if db.First(&user, "username=?", mobile).RecordNotFound()
return nil
return user
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
add a comment |
you can use this code:
user:=&User
if db.First(&user, "username=?", mobile).RecordNotFound()
return nil
return user
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
add a comment |
you can use this code:
user:=&User
if db.First(&user, "username=?", mobile).RecordNotFound()
return nil
return user
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
you can use this code:
user:=&User
if db.First(&user, "username=?", mobile).RecordNotFound()
return nil
return user
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
answered Mar 27 at 14:15
morteza khademmorteza khadem
815 bronze badges
815 bronze badges
add a comment |
add a comment |
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1
There is no "best practice" here. Only opinion. Do what makes sense for your application.
– Flimzy
Mar 27 at 11:21
"can simply return nil as the value instead of returning an error"? Yes, syntactically, if your return type is a pointer type,
nilis a valid value for that type. As to whether you should, that's purely opinion-based.– Adrian
Mar 27 at 13:19