Parse Xml--->Dircectly parse xml file,using Parsexml method used. Check Root Element have child.If It's had child call loadChilds method. Parse Xml File-->Choose Xml file (xml file)blob to string,using Parsexmlfile method used.Check Root Element have child.If It's had child call loadChilds method.
Full Answer
How do I perform DML operations in apex?
Apex offers two ways to perform DML operations: using DML statements or Database class methods. This provides flexibility in how you perform data operations. DML statements are more straightforward to use and result in exceptions that you can handle in your code. This is an example of a DML statement to insert a new record.
How does the apex parser select the correct method implementation?
Depending on whether the method is called with one or two Integers, the Apex parser selects the appropriate implementation to execute. If the parser can’t find an exact match, it then seeks an approximate match using type coercion rules. For more information on data conversion, see Rules of Conversion.
How are methods implemented in apex?
For example, a method named example can be implemented in two ways, one with a single Integer parameter and one with two Integer parameters. Depending on whether the method is called with one or two Integers, the Apex parser selects the appropriate implementation to execute.
What are the advantages of apex?
Can refer to themselves or to methods defined later in the same class or anonymous block. Apex parses methods in two phases, so forward declarations aren’t needed. Can be polymorphic. For example, a method named example can be implemented in two ways, one with a single Integer parameter and one with two Integer parameters.
How do I parse a response in Apex?
Process :Step1: First we get JSON data from REST API. Or if you already have then you can you this.Step2: Go to JSON2Apex Converter and paste the JSON data.Step3: Create this apex class in Org and Use for parse the data.JSON2Apex.cls:GetZoneData.cls :
What is parse in salesforce?
In salesforce, we use methods of JSONParser class to parse the JSON-encoded string/content that is returned from a call to an external service such that web service(HTTP) callout.
How do I deserialize JSON strings in Apex?
deserialize() , you must specify the type of value you expect the JSON to yield, and Apex will attempt to deserialize to that type. JSON. serialize() accepts both Apex collections and objects, in any combination that's convertible to legal JSON. String jsonString = JSON.
What is the method signature of the method that converts a JSON string into an apex type?
deserializeStrict(jsonString, apexType) Deserializes the specified JSON string into an Apex object of the specified type.
What is JSON parsing in salesforce?
Use the JSONParser class methods to parse JSON-encoded content. These methods enable you to parse a JSON-formatted response that's returned from a call to an external service, such as a web service callout.
What is JSONParser in salesforce?
JSONParser methods to parse a response that's returned from a call to an external service that is in JSON format, such as a JSON-encoded response of a Web service callout.
What is serialize and deserialize in Apex?
Serialization is a process of converting an apex object into stream of bytes so that it can be transferred over a network or stored in a salesforce record. Deserialization is the exact opposite – which convert bytes of stream into object.
What is serializing and Deserializing?
Serialization is the process of converting an object into a stream of bytes to store the object or transmit it to memory, a database, or a file. Its main purpose is to save the state of an object in order to be able to recreate it when needed. The reverse process is called deserialization.
What is JSON serialize and deserialize?
JSON is a format that encodes objects in a string. Serialization means to convert an object into that string, and deserialization is its inverse operation (convert string -> object).
Is Apex difficult to learn?
Learning Apex will not be easy but you can do it. Persevere! It is a journey that will make you smarter and more desirable on the job market. The use of the above 4 resources combined with the 2 tools and 3 attitudes will bring triumph to your clutch.
Can we write DML and SOQL in the constructor?
Hi, No you can't perform any DML in Constructor.
How do I deserialize JSON?
A common way to deserialize JSON is to first create a class with properties and fields that represent one or more of the JSON properties. Then, to deserialize from a string or a file, call the JsonSerializer. Deserialize method.
Passing Method Arguments by Value
In Apex, all primitive data type arguments, such as Integer or String, are passed into methods by value. This fact means that any changes to the arguments exist only within the scope of the method. When the method returns, the changes to the arguments are lost.
Versioned Behavior Changes
In API version 50.0 and later, scope and accessibility rules are enforced on Apex variables, methods, inner classes, and interfaces that are annotated with @namespaceAccessible. For accessibility considerations, see NamespaceAccessible Annotation.
Example: Parsing a JSON Response from a Web Service Callout
This example parses a JSON-formatted response using JSONParser methods. It makes a callout to a web service that returns a response in JSON format. Next, the response is parsed to get all the totalPrice field values and compute the grand total price.
Example: Parse a JSON String and Deserialize It into Objects
This example uses a hardcoded JSON string, which is the same JSON string returned by the callout in the previous example. In this example, the entire string is parsed into Invoice objects using the readValueAs method.
DML Statement vs. Database methods in Salesforce
As a Salesforce application developer, we always have a question like in how many ways we can perform the DML operations when dealing with transactions? The answer is Salesforce provides 2 ways to perform the DML operations.
Simple DML Operation Use Case
List<Account> accounts = new List<Account> (); accounts.add (new Account (Name = 'Test Account')); accounts.add (new Account (Name = 'Test Account')); System.debug ('Account List Size : ' +accounts.size ()); insert accounts;
Using Database class for inserting the records
It supports partial execution, which means if an error encountered an apex records execution. Then It will not rolled back the full transactions.