Throw
A throw construct explicitly raises or propagates an exception, error, or value to transfer control nonlocally from normal execution.
100 SQL Server Mistakes and How to Avoid Them
THROW is a SQL Server statement that rethrows an original exception or raises a specified ad hoc error.
- How it is used
- Surfaces meaningful failures after errors are trapped in SQL Server error-handling paths.
- How deep it goes
- Positions THROW within TRY..CATCH and transaction cleanup, without detailing its syntax or rethrow semantics.
- Examples
- Uses a renamed sales-order detail table and invalid product IDs to produce transactional database errors.
- What you can do after
- Apply it via T-SQL to raise meaningful errors after handling failures in transactional code.
Read how 100 SQL Server Mistakes and How to Avoid Them explains throw →
The Joy of JavaScript
A throw expression is an expression form that raises an exception from within an expression context.
- How it is used
- Uses throw expressions to make validation and other error-handling paths composable inside expression-oriented JavaScript code.
- How deep it goes
- Explains the proposal’s rationale and supported expression contexts, but defers detailed enablement instructions to an appendix.
- Examples
- Demonstrates a missing-block error through a proof-of-work function’s default parameter.
- What you can do after
- Evaluate how proposed throw expressions reduce wrapper functions and blocks when raising exceptions from expression contexts.
Practical Automation with PowerShell: Effective scripting from the console to the cloud
A throw statement generates an exception or terminating error that interrupts normal PowerShell execution.
- How it is used
- Guards automation preconditions and reports unrecoverable failures such as duplicate archive paths or timed-out processes.
- How deep it goes
- Explains terminating control flow, `try`/`catch` handling, `-ErrorAction Stop`, error inspection, and re-throwing rather than language internals.
- Examples
- Uses duplicate archive-file detection, missing-service handling, and a timed-out `ping.exe` process.
- What you can do after
- Apply it to halt unsafe automations, route terminating failures through `catch`, and signal external-process timeouts.
Related concepts
- non-local returnaddresses · A non-local return is a control-flow transfer that exits an enclosing function or computation from within nested code.
- exceptionkind of · An exception is a runtime signal or object representing an abnormal condition that interrupts ordinary program flow and may be handled or propagated.
- RAISERRORalternative to · RAISERROR is a SQL Server statement or function for generating an error message with specified error information and severity behavior.
- async iterableused by · An async iterable is an object that produces a sequence of values asynchronously through an asynchronous iteration protocol.
- return statementcontrasts with · A return statement ends the current function or routine invocation and optionally supplies its result to the caller.
- terminating errorproduces · A terminating error is an execution error that stops the current PowerShell operation or script unless it is handled.
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