database.getQueryLocator in Salesforce returns a Query Locator that runs your selected SOQL query returning list that can be iterated over in batch apex or used for displaying large sets in VF (allowing things such as pagination). In Batch Apex, if you use Database.getQueryLocator (), it supports upto 50 million records. Hope this helps you.
What is database getquerylocator?
what is database.getquerylocator & how many minimum and maximum records fetched from database database.getQueryLocator returns a Query Locator that runs your selected SOQL query returning list that can be iterated over in bathc apex or used for displaying large sets in VF (allowing things such as pagination).
How to make a soql query at runtime in Salesforce?
database.query in Salesforce allows you to make a dynamic SOQL query at runtime. You can build up a string and then use that as a query string at run time in the database.query statement to make a SOQL call that is determined at run time. In Batch Apex, if you use Database.query (), it supports 50,000 records only.
How to access the children of a query using querylocator?
Also how do you access the children retrieved using a QueryLocator like so (it's a relationship query): Database.getQuerylocator ( [select Id, Name, (select Name from Account) from Contact]); Thanks in advance. Here is a link to the short doc on QueryLocator object.
What is the difference between querylocator and iteratable in SQL Server?
It depends on your need , if you want to run batch on records that can be filtered by SOQL then QueryLocator is preferable, but if records that you want to bee processed by batch can not be filtered by SOQL then you will have to use iteratable.
What is the difference between Database query and Database getQueryLocator?
2. Database. query() is used to construct dynamic query instead of using SOQL query where as Database. getQueryLocator() is the return type of start method of a Batch class.
Why do we use Database getQueryLocator?
QueryLocator object when you are using a simple query (SELECT) to generate the scope of objects used in the batch job. If you use a querylocator object, the governor limit for the total number of records retrieved by SOQL queries is bypassed but we can retrieve up to 10,000 records. Database.
What is the use of Database query in Salesforce?
query in Salesforce allows you to make a dynamic SOQL query at runtime. You can build up a string and then use that as a query string at run time in the database. query statement to make a SOQL call that is determined at run time.
What is query locator?
A query locator represents a server-side cursor for a query. Typically a query locator is returned when not all the records requested in a query fit into the returned data set. This way a queryMore() can be issued with the provided query locator to get additional rows.
How do I query more than 10000 records in Salesforce?
You could use batch apex, and it is the only way by which you can query some millions of records without hitting the governor limits. You can find the document for writing batch apex here. Thanks. you can fetch the records in batches in 200 (the implicit query more pattern).
How do I query more than 50000 records in Salesforce?
You cannot retrieve more than 50,000 records your SOQL calls in a single context. However, with Batch Apex your logic will be processed in chunks of anywhere from 1 to 200 records in a batch. You'd need to modify your business logic to take the batching into account if necessary.
What is the difference between SOQL and database query ()?
the query can be used wherever a static SOQL query can be used, such as in regular assignment statements and for loops. Unlike inline SOQL, fields in bind variables are not supported. So the fundamental difference is the lack of support for variable binding.
What is the difference between iterator and QueryLocator?
QueryLocator() and Iterable in BatchApex?" - The answer depends on your need, if you want to run a batch on records that can be filtered by SOQL then QueryLocator is preferable, but if records that you want to be processed by batch cannot be filtered by SOQL then you will have to use Iterable.
What is the difference between database QueryLocator and Iterable?
With the QueryLocator object, the governor limit for the total number of records retrieved by SOQL queries is bypassed and you can query up to 50 million records. However, with an Iterable, the governor limit for the total number of records retrieved by SOQL queries is still enforced.
What is database Batchablecontext in Salesforce?
Represents the parameter type of a batch job method and contains the batch job ID. This interface is implemented internally by Apex.
What is query and query locator in Salesforce?
QueryLocator Methods Returns the query used to instantiate the Database. QueryLocator object. This is useful when testing the start method. iterator() Returns a new instance of a query locator iterator.
What is batch apex in Salesforce?
Batch Apex is used to run large jobs (think thousands or millions of records!) that would exceed normal processing limits. Using Batch Apex, you can process records asynchronously in batches (hence the name, “Batch Apex”) to stay within platform limits.