MySQL：为什么'true'保存为0？

Question

我在MySQL中有一个数据库，其中我的表的列是布尔值：

`eligibilityDate` tinyint(1) NOT NULL

数据通过以下功能从我的iOS Swift应用程序到达：

let postParams = "action=save_report&id_fish=\(Reporting.fishId)&fish_name=\(Reporting.fishName)&detectedSize=\(Reporting.detectedSize)&eligibilitySize=\(Reporting.eligibilitySize)&eligibilityDate=\(Reporting.eligibilityDate)&origin=\(Reporting.origin)&production=\(Reporting.production)&townReport=\(Reporting.townReport)"

request.HTTPBody = postParams.dataUsingEncoding(NSUTF8StringEncoding)

我猜Bool变量eligibilityDate和eligibilitySize从true / false转换为'true'/'false'。 无论如何，似乎'真''值在MySQL中保存为0 ...为什么？这是正确的方法吗？

更新

可能的解决办法是：

let postParams = "action=save_report&id_fish=\(Reporting.fishId)&fish_name=\(Reporting.fishName)&detectedSize=\(Reporting.detectedSize)&eligibilitySize=\(Reporting.eligibilitySize ? 1 : 0)&eligibilityDate=\(Reporting.eligibilityDate ? 1 : 0)&origin=\(Reporting.origin)&production=\(Reporting.production)&townReport=\(Reporting.townReport)"