Functions JScms
Function: JScms_field_not_exist_id
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Function: JScms_field_not_exist_id
The JScms_field_not_exist_id function checks if a specific value exists in a database table for a given field, excluding a specific row by its ID.
Syntax
JScms_field_not_exist_id(object $jakdb, string $table, int $id, string $field, mixed $value): bool
Parameters
$jakdb: (object) Database connection instance.$table: (string) The name of the database table to query.$id: (int) The ID of the row to exclude from the check.$field: (string) The field to check for the specified value.$value: (mixed) The value to check in the specified field.
Returns
(bool) true if the value exists in the specified field (excluding the given ID), or false otherwise.
Example Usage
<?php
if (JScms_field_not_exist_id($jakdb, "users", 10, "email", "user@example.com")) {
echo "Email already exists for another user.";
} else {
echo "Email is available.";
}
?>
Best Practices
- Use this function to enforce unique constraints for fields like email or username during updates.
- Ensure the
$idparameter correctly identifies the current row to exclude from the check.
Common Issues
- Incorrect Table or Field: Ensure the specified table and field exist in the database schema.
- Invalid ID: Pass a valid integer for the
$idparameter to avoid excluding unintended rows.