从两个组合的数组中获取值

Question

我有两个这样的数组...

idArray : [123, 456, 789]

theRowIdArray: ["2", "3", "4"]

这里的theRowIdArray 对应于我在数据库中的表的行。 idArray 对应于我必须在表中的列中针对行更新的值。

如何以可以更新表中行的格式合并这两个数组。我觉得这可以使用字典来实现..但不确定如何...

我想要这样的东西......

for (id, rowID) in myDataset { //Here `myDataset` will contain the elements of both arrays
  Update myTable Set theIDColumn = id Where Row_Id = rowID //Here will be code to update DB
}

Answer 1

您可以像这样使用字典来组合两个数组...

var idArray = [123, 456, 789]
var theRowIdArray = ["2", "3", "4"]

//using Dictionary
var myDataset: [Int : String] = [:]

//combining both array
for (index, element) in idArray.enumerated() {
    myDataset[element] = theRowIdArray[index]
}
print(myDataset) // [123: "2", 456: "3", 789: "4"]

//Loop through your myDataset Dictionary
for (id,rowID) in myDataset {
    print("\(id) = \(rowID)")
     // your code here...
}

Answer 2

您可以使用zip(_:_:)方法从idArray和theRowIdArray获取组合数组

let combinedArray = Array(zip(idArray, theRowIdArray))

你不能像combinedArray一样循环，

for (id, row) in combinedArray {
    print(id, row)
    //add your code here...
}