Apex - For 迴圈

for 迴圈是一種重複控制結構，可讓你有效編寫需要執行特定次數的迴圈。考慮一種業務案例，其中我們需要一次性處理或更新 100 條記錄。這就是迴圈語法提供幫助並使工作更輕鬆的地方。

語法

for (variable : list_or_set) { code_block }

流程圖

示例

考慮我們有一個 Invoice 物件，其中儲存了每日發票資訊，如 CreatedDate、Status 等。在此示例中，我們將獲取當天建立的具有 Paid 的發票狀態的發票。

注意 − 在執行此示例之前，請在 Invoice 物件中建立至少一條記錄。

// Initializing the custom object records list to store the Invoice Records created today
List<apex_invoice__c> PaidInvoiceNumberList = new List<apex_invoice__c>();

// SOQL query which will fetch the invoice records which has been created today
PaidInvoiceNumberList = [SELECT Id,Name, APEX_Status__c FROM APEX_Invoice__c WHERE
   CreatedDate = today];

// List to store the Invoice Number of Paid invoices
List<string> InvoiceNumberList = new List<string>();

// This loop will iterate on the List PaidInvoiceNumberList and will process each record
for (APEX_Invoice__c objInvoice: PaidInvoiceNumberList) {
   
   // Condition to check the current record in context values
   if (objInvoice.APEX_Status__c == 'Paid') {
      
      // current record on which loop is iterating
      System.debug('Value of Current Record on which Loop is iterating is'+objInvoice);
      
      // if Status value is paid then it will the invoice number into List of String
      InvoiceNumberList.add(objInvoice.Name);
   }
}

System.debug('Value of InvoiceNumberList '+InvoiceNumberList);