Fix NPE when database init failed (#34)

Fs02 · web-flow · commit c042811c3167 · 2022-08-27T00:00:27.000+09:00
diff --git a/mysql.go b/mysql.go
@@ -86,10 +86,12 @@ func getIncrement(database *db.DB) int {
 	var (
 		variable  string
 		increment int
-		row       = database.QueryRow("SHOW VARIABLES LIKE 'auto_increment_increment';")
 	)
 
-	check(row.Scan(&variable, &increment))
+	if database != nil {
+		check(database.QueryRow("SHOW VARIABLES LIKE 'auto_increment_increment';").Scan(&variable, &increment))
+	}
+
 	return increment
 }
 

Original file line number	Diff line number	Diff line change
`@@ -86,10 +86,12 @@ func getIncrement(database *db.DB) int {`
`86`	`86`	`var (`
`87`	`87`	`variable string`
`88`	`88`	`increment int`
`89`		`- row = database.QueryRow("SHOW VARIABLES LIKE 'auto_increment_increment';")`
`90`	`89`	`)`
`91`	`90`
`92`		`- check(row.Scan(&variable, &increment))`
	`91`	`+ if database != nil {`
	`92`	`+ check(database.QueryRow("SHOW VARIABLES LIKE 'auto_increment_increment';").Scan(&variable, &increment))`
	`93`	`+ }`
	`94`	`+`
`93`	`95`	`return increment`
`94`	`96`	`}`
`95`	`97`