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Amans SOQL queries in Apex code
hey Guys ,
just going through Apex code SOQL queries and found some statements that confuse me a bit ,
u guys just have a look and help me out to reach any conclusion
statement 1
"It is important to note that SOQL queries only return data for SObject fields that are selected in the original query. Any fields that are not selected in the SOQL query (other than ID) are null when dereferenced in Apex Code, even if they contain values in the database."
Account a1 = [select id from accountwhere name = 'Acme'];
Double amt1 = 2 * a1.annualRevenue;
// The code above is incorrect: amt1 is now null, even if
// the account contains a value for annualRevenue in the
// database
Account a2 = [select id, annualRevenue from account
where name = 'Acme'];
Double amt2 = 2 * a2.annualRevenue;
48
Expressions
// The code above is correct: if the account contains a value
// for annualRevenue in the database, amt2 will not be null
statement 2
"Even if only one SObject field is selected, a SOQL query always returns a complete record. Consequently, you must dereference the field in order to access it."
Double rev = [select annualRevenue from account
where name = 'Acme'][0].annualRevenue;
*contradiction is if I can access only those fields that are in the original query what is the need to dereference it ,
and if query returns a complete record then i can derefernce any field without necessarly providing in query*
thx
just going through Apex code SOQL queries and found some statements that confuse me a bit ,
u guys just have a look and help me out to reach any conclusion
statement 1
"It is important to note that SOQL queries only return data for SObject fields that are selected in the original query. Any fields that are not selected in the SOQL query (other than ID) are null when dereferenced in Apex Code, even if they contain values in the database."
Account a1 = [select id from accountwhere name = 'Acme'];
Double amt1 = 2 * a1.annualRevenue;
// The code above is incorrect: amt1 is now null, even if
// the account contains a value for annualRevenue in the
// database
Account a2 = [select id, annualRevenue from account
where name = 'Acme'];
Double amt2 = 2 * a2.annualRevenue;
48
Expressions
// The code above is correct: if the account contains a value
// for annualRevenue in the database, amt2 will not be null
statement 2
"Even if only one SObject field is selected, a SOQL query always returns a complete record. Consequently, you must dereference the field in order to access it."
Double rev = [select annualRevenue from account
where name = 'Acme'][0].annualRevenue;
*contradiction is if I can access only those fields that are in the original query what is the need to dereference it ,
and if query returns a complete record then i can derefernce any field without necessarly providing in query*
thx
Steve