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Where should I close the sql.DB?

原文 2014-09-15 23:54:10 0 1 go

According to the godoc :

It is rare to Close a DB, as the DB handle is meant to be long-lived and shared between many goroutines.

Is there any use cases of this method except calling it defer db.Close() inside the main function?

1 answers

I never close databases. Deferring it in main likely won't hurt... but it won't help anything either. The end of main is the end of the program and if main ends, the OS does the cleaning.

Edit:

So why we need it in public API of the database/sql package?

Closing a DB is useful if you don't plan to use the database again. It does all the cleanup that would be done at program termination but allows the program to continue to run.

How should I pass around the *sql.DB variable in several places in the code?

Go/Golang sql.DB reuse in functions

Convert sqlx.DB to sql.DB in Go

sql.DB on aws-lambda too many connection

invalid memory address or nil pointer dereference with sql.DB

Implement an interface for the return type of the Query method of the sql.DB

(GoLANG) *sql.DB Scan rows into string array pointer

Wrapped sql.DB by struct can't invoke methods in instance

Golang build error: cannot assign *sqlx.DB to *sql.DB

db *sql.DB declared in a.go not available in b.go

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Related Question How should I pass around the *sql.DB variable in several places in the code? Go/Golang sql.DB reuse in functions Convert sqlx.DB to sql.DB in Go sql.DB on aws-lambda too many connection invalid memory address or nil pointer dereference with sql.DB Implement an interface for the return type of the Query method of the sql.DB (GoLANG) *sql.DB Scan rows into string array pointer Wrapped sql.DB by struct can't invoke methods in instance Golang build error: cannot assign *sqlx.DB to *sql.DB db *sql.DB declared in a.go not available in b.go

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Where should I close the sql.DB?

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1 answers

solution1 1 ACCPTED 2014-09-15 23:58:22

solution1
1 ACCPTED 2014-09-15 23:58:22