When working with PHP, pg_copy_from can help with a specific task: loads array lines into a PostgreSQL table using the COPY protocol.
This guide shows what pg_copy_from does, how to use it in code, and which details you should check before relying on the result.
What Is pg_copy_from in PHP?
Loads array lines into a PostgreSQL table using the COPY protocol.
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_copy_from with a direct PHP expression.
<?php
$databaseConnection = pg_connect(getenv("PG_CONNECTION_STRING")); if ($databaseConnection === false) { throw new RuntimeException("Connection failed"); } $lines = ["1 Alex", "2 Sam"]; var_dump(pg_copy_from($databaseConnection, "import_people", $lines));
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"); } $lines = ["10|Open", "11|Closed"]; var_dump(pg_copy_from($databaseConnection, "ticket_status", $lines, "|"));
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_copy_from 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"); } $lines = ["100 Widget
", "101 Gadget
"]; if (!pg_copy_from($databaseConnection, "product_import", $lines)) { throw new RuntimeException("Import failed"); } echo "Rows imported";
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
Important Behavior and Edge Cases
- Core behavior: Loads array lines into a PostgreSQL table using the COPY protocol.
- Important limitation: Requires a live connection and correctly escaped COPY-formatted rows; delimiters and null markers must match the server schema.
- Production use: Check return values and handle failures before acting on the result.
Comparison With Related Functions
| Function or Approach | Difference |
|---|---|
pg_copy_from() | Loads array lines into a PostgreSQL table using the COPY protocol. |
pg_copy_to() | 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_copy_from(). | Requires a live connection and correctly escaped COPY-formatted rows; delimiters and null markers must match the server schema. |
Using pg_copy_from() without checking the outcome. | Handle failures and confirm that the output is suitable for the next step. |
Key Takeaways
- Loads array lines into a PostgreSQL table using the COPY protocol.
- Requires a live connection and correctly escaped COPY-formatted rows; delimiters and null markers must match the server schema.
- Test the function with relevant inputs before using it in production.
Use pg_copy_from when its behavior matches the job you need to complete. For dependable results, consider the input data, returned value and limitations shown above.