SOQL Skills

Queries

SOQL Dynamic SOQL

Dynamic SOQL Queries

SOQL dynamic queries build queries at runtime in Apex.

Introduction to Dynamic SOQL

Dynamic SOQL refers to the process of constructing SOQL queries at runtime within the Apex programming language. Unlike static SOQL, where the query is defined at compile time, dynamic SOQL allows developers to build queries dynamically based on user input or other runtime conditions. This flexibility is crucial for applications requiring adaptable query logic.

Benefits of Using Dynamic SOQL

Dynamic SOQL offers several advantages:

  • Flexibility: Construct queries based on runtime conditions.
  • User-driven features: Enable features like search functionality where users can dictate the search criteria.
  • Adaptability: Modify queries without changing the codebase, useful for applications with frequently changing requirements.

Constructing Dynamic SOQL Queries

To construct a dynamic SOQL query in Apex, you can use string concatenation or the String.format() method to build the query string. Ensure to use bind variables to prevent SOQL injection attacks. Here is a basic example:

Preventing SOQL Injection

When constructing dynamic queries, it's essential to prevent SOQL injection. Always use bind variables when possible. Here's an example using bind variables:

Handling Complex Scenarios

For complex queries, consider using a Map to store dynamic conditions and a loop to construct the query string. This approach enhances readability and maintainability:

Best Practices for Dynamic SOQL

  • Use bind variables to prevent injection attacks.
  • Validate user input before incorporating it into queries.
  • Test queries with various input scenarios to ensure robustness.
  • Keep dynamic query logic separate from other business logic to enhance maintainability.

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