feature request: trace log sql query statements

[stokito]

I need to log the raw SQL statements.

We can specify a custom logger when opening a database:

	cfg, _ := mysql.ParseDSN(dsName)
	// set a custom logger
	tracer := log.New(os.Stdout, "[mysql] ", log.Ldate|log.Ltime|log.Lshortfile)
	cfg.Logger = tracer

	connector, err := mysql.NewConnector(cfg)
	if err != nil {
		return err
	}
	db := sql.OpenDB(connector)

But the logger won't log SQL statements from Exec() and Query(), but only some internal problems. See mysqlConn.log() usage.

Is it possible to add an sql logging in the driver? This may be a flag in a config like cfg.LogStatements = true or a separate logger/tracer field cfg.Tracer like this implemented in the PGX driver tracelog:

config, err := pgxpool.ParseConfig(dsName)
tracer = &tracelog.TraceLog{Logger: myLogger, LogLevel: tracelog.LogLevelInfo}
config.ConnConfig.Tracer = tracer