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![ソースも見てみよう
type DB struct {
driver driver.Driver
dsn string
numClosed uint64
mu sync.Mutex
freeConn []*driverConn
connReque...](https://image.slidesharecdn.com/databasesql-170126055803/75/Database-sql-6-2048.jpg?cb=1667505141)
![ソースも見てみよう(3)
func (db *DB) Close() error {
// (略)
var err error
fns := make([]func() error, 0, len(db.freeConn))
for _, dc...](https://image.slidesharecdn.com/databasesql-170126055803/75/Database-sql-8-2048.jpg?cb=1667505141)
