如何在swift中從sqlite列中總結字符串數組

Question

我在我的iOS應用程序上有sqlite表，並且我想總結它的一列中的所有字符串數字。列名是：「算」

我寫了這個代碼來獲取數字：

let kiwi = DB.getInstance() 
    let records = kiwi.executeQuery("SELECT * FROM zekrlist") 
    for record in records { 
     let structContact = StructContact() 
     structContact.id = record.column["id"]?.asInt() 
     structContact.count = record.column["count"]?.asString() 
     print(structContact.count) 

打印結果是這樣的：

4

2

我想這些數字的總和：

6

任何幫助將不勝感激。

Answer 1

let kiwi = DB.getInstance() 
let count:Int = 0 
let records = kiwi.executeQuery("SELECT * FROM zekrlist") 
for record in records { 
    let structContact = StructContact() 
    structContact.id = record.column["id"]?.asInt() 
    structContact.count = record.column["count"]?.asString() 
    count = count + structContact.count.asInt() // Int(structContact.count) 
} 
print(count) 

Answer 2

試試這個： -

let records = kiwi.executeQuery("SELECT SUM(columnName) AS resultName FROM tableName") 
var sum = 0 
for record in records 
{ 
    sum += record.column["resultName"]?.asInt() ?? 0 
}