Golang combined with mysql how to set the maximum number of connections and the maximum number of idle connections

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The maximum number of connections and the maximum number of idle connections are defined as database/sql in the golang standard library.

In this paper, the SQL driver package used to connect MySQL is github.com/go-sql-driver/mysql.

The interface for setting the maximum number of connections is

Func (db * DB) SetMaxOpenConns (n int)

Sets the maximum number of connections that the connection MySQL can open.

If n