如何在swift

Question

我的iOS应用程序上有一个sqlite表，我想总结一列的所有字符串编号。列名是：“count”

我写了这段代码来获取数字：

   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)

打印结果如下：

  

4

     

2

我希望将这些数字加在一起：

  

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
}