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How Can I Execute Multiple INSERT Statements Simultaneously in MySQL Using mysqli?
How Can I Execute Multiple INSERT Statements Simultaneously in MySQL Using mysqli?
Dec 07, 2024 pm 07:50 PM
Multiple mysqli Queries: Running INSERT Statements Simultaneously
Original Problem:
Attempts to execute two INSERT statements using mysqli_query() consecutively result in the failure of the second query. This issue stems from MySQL's security measures, which prevent multiple queries from being executed in a single call.
Solution: mysqli_multi_query()
To execute multiple queries in a single call, it is necessary to utilize the mysqli_multi_query() function:
$query = "INSERT INTO images (project_id, user_id, image_name, date_created, link_to_file, link_to_thumbnail, given_name) VALUES ('$project_id', '$user_id', '$image_name', '$date_created', '$link_to_file', '$thumbnail', '$ImageName');";
$query .= "INSERT INTO images_history (project_id, user_id, image_name, date_created, link_to_file, link_to_thumbnail, given_name, day, month, year) VALUES ('$project_id', '$user_id', '$image_name', '$date_created', '$link_to_file', '$thumbnail', '$ImageName', '$day', '$month', '$year');";
$result = mysqli_multi_query($mysqli, $query);
Processing Query Results
Executing mysqli_multi_query() returns a boolean value. However, it is crucial to manually retrieve the results of each query using mysqli_store_result() and loop through them using mysqli_more_results() and mysqli_next_result():
while (mysqli_more_results($mysqli) && mysqli_next_result($mysqli)) {
if (($result = mysqli_store_result($mysqli)) === false && mysqli_error($mysqli) != '') {
echo "Query failed: " . mysqli_error($mysqli);
}
}
Advantages of mysqli_multi_query()
- Executes multiple queries efficiently in a single call.
- Maintains database integrity by preventing query interference.
Additional Considerations
- mysqli_store_result() may return FALSE for queries without results (e.g., INSERT statements). Use mysqli_error() to confirm success.
- Refer to the documentation for mysqli_multi_query(), mysqli_more_results(), mysqli_next_result(), and mysqli_store_result() for further details.
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