如何在swift中从sqlite列中总结字符串数组

Question

我在我的iOS应用程序上有sqlite表，并且我想总结它的一列中的所有字符串数字。列名是：“算”

我写了这个代码来获取数字：

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) 

打印结果是这样的：

4

2

我想这些数字的总和：

6

任何帮助将不胜感激。

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

试试这个： -

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