When working with PHP, pg_delete can help with a specific task: deletes PostgreSQL table rows based on an associative array of conditions.
This guide shows what pg_delete does, how to use it in code, and which details you should check before relying on the result.
What Is pg_delete in PHP?
Deletes PostgreSQL table rows based on an associative array of conditions.
Usage: The following examples show calls with suitable values. Consult the function parameters described in the examples, especially when optional arguments or extensions are involved.
Example 1: Basic Usage
The first example introduces pg_delete with a direct PHP expression.
<?php
$databaseConnection = pg_connect(getenv("PG_CONNECTION_STRING")); if ($databaseConnection === false) { throw new RuntimeException("Connection failed"); } var_dump(pg_delete($databaseConnection, "draft_notes", ["id" => 15]));
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
Example 2: A Different Input or Option
This second example demonstrates another input or condition, so you can compare the behavior with the first example.
<?php
$databaseConnection = pg_connect(getenv("PG_CONNECTION_STRING")); if ($databaseConnection === false) { throw new RuntimeException("Connection failed"); } var_dump(pg_delete($databaseConnection, "expired_tokens", ["token_id" => 24], PGSQL_DML_EXEC));
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
Practical Example
Here is a small scenario illustrating how pg_delete can fit into application code. Run the example only in an appropriate development environment if it reads files, changes data, starts processes or connects to a service.
<?php
$databaseConnection = pg_connect(getenv("PG_CONNECTION_STRING")); if ($databaseConnection === false) { throw new RuntimeException("Connection failed"); } $rowIdentifier = 15; if ($rowIdentifier > 0) { $deleted = pg_delete($databaseConnection, "temporary_rows", ["id" => $rowIdentifier]); if (!$deleted) { throw new RuntimeException("Delete failed"); } }
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
Important Behavior and Edge Cases
- Core behavior: Deletes PostgreSQL table rows based on an associative array of conditions.
- Important limitation: Deleting rows is destructive; require authorization and avoid broad or empty conditions. Prefer parameterized SQL for complex conditions.
- Production use: Check return values and handle failures before acting on the result.
Comparison With Related Functions
| Function or Approach | Difference |
|---|---|
pg_delete() | Deletes PostgreSQL table rows based on an associative array of conditions. |
pg_query_params() | Related approach. Its purpose and return value differ; select it when your task matches that operation. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
Overlooking a special case of pg_delete(). | Deleting rows is destructive; require authorization and avoid broad or empty conditions. Prefer parameterized SQL for complex conditions. |
Using pg_delete() without checking the outcome. | Handle failures and confirm that the output is suitable for the next step. |
Key Takeaways
- Deletes PostgreSQL table rows based on an associative array of conditions.
- Deleting rows is destructive; require authorization and avoid broad or empty conditions. Prefer parameterized SQL for complex conditions.
- Test the function with relevant inputs before using it in production.
Use pg_delete when its behavior matches the job you need to complete. For dependable results, consider the input data, returned value and limitations shown above.