# Feature: Lifecycle and Validation

Specifies the prepared statement lifecycle management and test validation requirements, ensuring proper resource cleanup on both client and server, and comprehensive test coverage for all prepared statement functionality.

## Background

Prepared statements consume resources on both the client and Exasol server. The system must properly manage these resources throughout the statement lifecycle, including explicit cleanup, connection-scoped cleanup, and graceful handling of server-side expiration. All changes to prepared statement functionality must pass comprehensive unit, integration, and code quality gates before completion.

## Scenarios

### Scenario: Prepared statement cleanup

* *GIVEN* a prepared statement has been created
* *WHEN* a prepared statement is no longer needed
* *THEN* it SHALL send a close request to release server resources
* *AND* it SHALL invalidate the local statement handle
* *AND* it SHALL prevent use-after-close errors

### Scenario: Connection close with active prepared statements

* *GIVEN* a prepared statement has been created
* *WHEN* a connection is closed with active prepared statements
* *THEN* it SHALL close all associated prepared statements
* *AND* it SHALL release server-side resources

### Scenario: Prepared statement timeout

* *GIVEN* a prepared statement has been created
* *WHEN* a prepared statement is unused for an extended period
* *THEN* it SHALL handle server-side expiration gracefully
* *AND* it SHALL provide clear error messages if statement expired

### Scenario: Unit test requirement

* *GIVEN* the prepared statement implementation is complete
* *WHEN* prepared statement implementation is complete
* *THEN* `cargo test` MUST pass with zero failures
* *AND* all prepared statement unit tests MUST be present and passing

### Scenario: Integration test requirement

* *GIVEN* the prepared statement implementation is complete
* *WHEN* prepared statement implementation is complete
* *THEN* integration tests with real Exasol database MUST pass
* *AND* parameterized query tests MUST demonstrate SQL injection protection

### Scenario: Code quality requirement

* *GIVEN* the prepared statement implementation is complete
* *WHEN* prepared statement implementation is complete
* *THEN* `cargo clippy --all-targets --all-features -- -W clippy::all` MUST produce zero warnings
* *AND* all new code MUST follow project conventions
