SOAP Web Service Example in Apex.

Exposing Apex Methods as SOAP Web Services is very simple.

Scenario : Suppose we have a custom Employee Object having 2 properties Name and Roll Number.
Now we want to create a web method or web service method, which will take employee name and roll number as parameters and Insert the record in Employee Object.

Below is a simple example for the above scenario,

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global class MyWebService {

webservice static String createEmployeeRecord(String empName, Integer empRollNo){
    if(empName != null && empName.trim().length() > 0 && empRollNo != null && empRollNo > 0){
      Employee__c empIns = new Employee__c(Name__c = empName, Roll_Number__c = empRollNo);
      try{
            INSERT empIns;
      }catch(DmlException e){
            System.debug('Error while performing Employee insertion.');
            return 'FAILURE';
      }
      return 'SUCCESS';
    }else{
            return 'FAILURE';
    }
  }
}

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Considerations :

1. Method should be define with "webservice static"
2. Class should be declared as "global"
3. Following elements should not be the web service method's parameters

•          Maps
•          Sets
•          Pattern objects
•          Matcher objects
•          Exception objects