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Apex Class Notes – Advanced Topics

describecode

Dynamic Apex Components Enables you to create more flexible applications by providing you the ability to access sObject and field metadata descriptions Allows you to write dynamic SOQL and SOSL queries and dynamic DML Consists of several components: Schema Describe – way to programmatically discover info about the current org schema. You can use the following to get a map of the schema: Map<String,Schema.sObjectType> gd = Schema.getGlobalDescribe(); Dynamic SOQL – […]

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Receiving and Sending Emails Through Apex

EmailCode

Inbound Email Services Automated process that uses Apex classes to process the content, headers and attachments from inbound emails to a salesforce.com email address. Each email service has one or more salesforce-generated email addresses to which users can send a message for processing. An email service only processes messages it receives at one of it’s addresses. For example, you can create an email service that automatically creates contact records based […]

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Working with Web Services

Custom Web Services The webservice keyword allows developers to create their own SOAP Web Services and defines methods that are inherently global Two ways to invoke Web Services: From the AJAX toolkit by importing the apex.js library and call the execute method From a client program by importing the WSDL and calling the custom method directly Access WSDL support through Setup -> Develop -> Classes Guidelines for Creating Custom Web […]

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Deploying Apex Code

Deployment Process – Steps are as follows: 1.)    Develop Develop Unit Test Begin Integration Testing 2.)    Integrate Software modules are tested as a group Integration testing may be done in another sandbox and is done before functional and acceptance testing 3.)    Stage Full regression testing Load Testing Specific new feature testing User acceptance testing 4.)    Production/Training After changes are accepted, change control board approves deployment in production and/or training Prerequisites […]

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Exceptions, Debugging and Testing

Exceptions Records information about the error, the type of error and the state of the script or program when the error occurred Exceptions can be handled using the following keywords: Throw Try Catch Finally (optional) Syntax Example: Try { Update positions; } Catch (System.DmlException e)  { System.debug(‘DML Exception: ‘ + e.getDmlMessage(0)); } Finally { Positions.clear(); } Exception Types System-defined Classes ListException DmlException MathException NullPointerException QueryException SecurityException SobjectException StringException TypeException User-defined […]

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Records in the Database

sObject Relationship Naming Syntax sObjects have different names depending on the relationship type. But either way, they are appended with __r.  For example: Parent-to-child – plural version of the child object – Interviewers__r Child-to-parent – singular version of the parent object – Position__c Relationships are written in dot notation and strung together to eventually reach the field that you need. For example: Review.job_application__r.position__r.status__c = ‘Closed’; There are two ways to […]

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Object-Oriented Programming in Apex

Classes A class is a template or blueprint from which objects are created. They consist of methods and attributes Are stored with the version of API that is used to compile it May contain other classes, known as inner classes (but these can only be one level deep) Even though Apex code is not case sensitive, it is recommended that you follow the Java naming convention Static methods and attributes […]

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