Php update all rows in table

Update multiple MySQL table rows using one HTML form

I’m using an HTML form within PHP to try and simultaneously update multiple rows in my MySQL table. The PHP seems to run (kind of) but updates my table with ‘Array’ in all the affected columns. Can someone please fill in the gaps to my code or explain what I’ve missed?! P.S. I know I need to escape my PHP to prevent injection attacks . that’ll come later 🙂 HTML and PHP code below. HTML form within PHP echo statement

 
    " . $schedule['assoc_to_start_time'] . " ---------- All day  " . $schedule['assoc_to_end_time'] . " ---------- No end time All day   
 

require_once('../inc/database-config.php'); $id1 = $_POST['identifier']; $assoc_to_username = $_POST['assoc_to_username']; $assoc_to_date = $_POST['assoc_to_date']; $assoc_to_start_time = $_POST['assoc_to_start_time']; $assoc_to_end_time = $_POST['assoc_to_end_time']; $taskname = $_POST['taskname']; foreach ($_POST['identifier'] as $id1) < $sql=mysql_query("UPDATE schedule SET assoc_to_date= $assoc_to_date, assoc_to_start_time= $assoc_to_start_time, assoc_to_end_time= $assoc_to_end_time, taskname=$taskname WHERE assoc_to_username=$assoc_to_username"); header("Location: ../admin.php?action=edited"); ;>if (!mysql_query($sql,$dbcon)) < die (header("Location: ../error.php")); >mysql_close($dbcon); 

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How to Update All Rows in a MySQL Table with New Values using PHP — A Step-by-Step Guide

Learn how to update all rows in a MySQL table with new values using PHP. This guide covers different methods, advantages, and disadvantages of updating all rows to the same value, updating specific columns with different values, using mysqli_query() function, updating multiple rows with different values, and updating a table with a new set of data.

• Updating All Rows to the Same Value
• Updating Specific Columns with Different Values
• Using mysqli_query() Function to Execute the UPDATE Query
• Updating Multiple Rows with Different Values
• Updating a Table with a New Set of Data
• Other helpful PHP code examples for updating all rows in a MySQL table with new values
• Conclusion
• How do I update all rows in a table in MySQL?
• How do I update multiple rows with different values in SQL?
• How to update multiple rows in MySQL using PHP?
• How do you update a table with a new set of data on both rows and columns?

If you’re working with MySQL tables, you may come across situations where you need to update all rows in a table with new values using PHP. Whether you’re updating the same value for all rows or different values for specific columns, this guide will walk you through the process step-by-step.

Updating All Rows to the Same Value

To update all rows in a MySQL table with the same value, you can use the SQL query:

UPDATE table_name SET column_name = new_value; 

Here, table_name is the name of your table, column_name is the name of the column you want to update, and new_value is the new value you want to set for that column.

To execute this query using PHP, you can use the mysqli_query() function. Here’s an example:

// Update all rows to the same value $sql = "UPDATE table_name SET column_name = 'new_value'"; if (mysqli_query($conn, $sql)) < echo "All rows updated successfully"; >else < echo "Error updating rows: " . mysqli_error($conn); >// Close connection mysqli_close($conn); ?> 

Advantages and Disadvantages of Updating All Rows to the Same Value

Updating all rows to the same value can be useful in certain situations, such as when you need to reset a column to a default value. However, it can also be risky if you accidentally update more rows than intended. Additionally, it may not be the best approach if you need to update different values for specific rows.

Updating Specific Columns with Different Values

To Update specific columns with different values, you can use the same UPDATE query but specify different values for each row. Here’s an example:

UPDATE table_name SET column1 = value1, column2 = value2, column3 = value3 WHERE condition; 

Here, column1 , column2 , and column3 are the names of the columns you want to update, and value1 , value2 , and value3 are the new values you want to set for each column. condition is an optional WHERE clause that you can use to specify which rows to update.

To execute this query using PHP, you can use the same mysqli_query() function but modify the SQL statement accordingly. Here’s an example:

// Update specific columns with different values $sql = "UPDATE table_name SET column1 = 'value1', column2 = 'value2', column3 = 'value3' WHERE condition"; if (mysqli_query($conn, $sql)) < echo "Specific columns updated successfully"; >else < echo "Error updating columns: " . mysqli_error($conn); >// Close connection mysqli_close($conn); ?> 

Advantages and Disadvantages of Updating Specific Columns with Different Values

Updating specific columns with different values can be more flexible than updating all rows to the same value. However, it can also be more complex and time-consuming, especially if you need to update a large number of rows or columns.

Using mysqli_query() Function to Execute the UPDATE Query

To execute the UPDATE query using PHP, you can use the mysqli_query() function provided by the MySQLi extension. This function takes two parameters: the database connection and the SQL statement. Here’s an example:

// Execute UPDATE query $sql = "UPDATE table_name SET column_name = 'new_value'"; if (mysqli_query($conn, $sql)) < echo "Query executed successfully"; >else < echo "Error executing query: " . mysqli_error($conn); >// Close connection mysqli_close($conn); ?> 

Advantages and Disadvantages of Using mysqli_query() Function

The mysqli_query() function is a convenient way to execute SQL queries in PHP. It provides a simple and consistent interface for interacting with MySQL databases. However, it may not be the most secure or efficient way to execute queries, especially if you’re working with sensitive data or large datasets.

Updating Multiple Rows with Different Values

To Update multiple rows with different values, you can use the INSERT INTO statement with the ON DUPLICATE KEY UPDATE clause. This statement inserts new rows into the table and updates existing rows if there is a duplicate key. Here’s an example:

INSERT INTO table_name (column1, column2, column3) VALUES (value1a, value2a, value3a), (value1b, value2b, value3b), . ON DUPLICATE KEY UPDATE column1 = VALUES(column1), column2 = VALUES(column2), column3 = VALUES(column3); 

Here, table_name , column1 , column2 , and column3 are the same as before. value1a , value2a , value3a , value1b , value2b , value3b , and so on are the new values you want to set for each row. The ON DUPLICATE KEY UPDATE clause specifies which columns to update if there is a duplicate key.

To execute this query using PHP, you can use the same mysqli_query() function but modify the SQL statement accordingly. Here’s an example:

// Update multiple rows with different values $sql = "INSERT INTO table_name (column1, column2, column3) VALUES ('value1a', 'value2a', 'value3a'), ('value1b', 'value2b', 'value3b'), . ON DUPLICATE KEY UPDATE column1 = VALUES(column1), column2 = VALUES(column2), column3 = VALUES(column3)"; if (mysqli_query($conn, $sql)) < echo "Multiple rows updated successfully"; >else < echo "Error updating rows: " . mysqli_error($conn); >// Close connection mysqli_close($conn); ?> 

Advantages and Disadvantages of Updating Multiple Rows with Different Values

Updating Multiple Rows with different values can be useful when you need to update a large number of rows or columns with different values. However, it can also be more complex and error-prone than updating specific columns with different values. Additionally, it may not be the best approach if you need to update only a few rows or columns.

Updating a Table with a New Set of Data

To update a table with a new set of data, you can use the UPDATE query with the SET and WHERE clauses. This query updates existing rows that match a certain condition with new values. Here’s an example:

UPDATE table_name SET column1 = value1, column2 = value2, column3 = value3 WHERE condition; 

Here, table_name , column1 , column2 , and column3 are the same as before. value1 , value2 , and value3 are the new values you want to set for each column. condition is a WHERE clause that specifies which rows to update based on certain criteria.

To execute this query using PHP, you can use the same mysqli_query() function but modify the SQL statement accordingly. Here’s an example:

// Update a table with a new set of data $sql = "UPDATE table_name SET column1 = 'value1', column2 = 'value2', column3 = 'value3' WHERE condition"; if (mysqli_query($conn, $sql)) < echo "Table updated successfully"; >else < echo "Error updating table: " . mysqli_error($conn); >// Close connection mysqli_close($conn); ?> 

Advantages and Disadvantages of Updating a Table with a New Set of Data

Updating a table with a new set of data can be useful when you need to replace or migrate data from one table to another. However, it can also be risky if you accidentally overwrite or delete important data. Additionally, it may not be the best approach if you need to update only a few rows or columns.

Other helpful PHP code examples for updating all rows in a MySQL table with new values

In sql, update all rows mysql code example

UPDATE tableName SET columnName = yourValue; #to update multiple columns: UPDATE tableName SET column1 = value1, column2 = value2; #and so on

$idresult = $conn->query("SELECT id FROM pictures");while ($row = $idresult->fetch_assoc())

In php, sql update row in php code example

mysql_query("UPDATE blogEntry SET content = '$udcontent', title = '$udtitle' WHERE > Updating all rows in a MySQL table with new values using PHP can be a complex task, but with the right approach and tools, it can be done efficiently and securely. In this guide, we covered the following key points:

• Updating all rows to the same value using the UPDATE query
• Updating specific columns with different values using the UPDATE query
• Using the mysqli_query() function to execute the UPDATE query
• Updating multiple rows with different values using the INSERT INTO statement with the ON DUPLICATE KEY UPDATE clause
• Updating a table with a new set of data using the UPDATE query with the SET and WHERE clauses

By following these examples and best practices, you can update all rows in a MySQL table with new values using PHP with confidence and ease.

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Как одним запросом обновить множество строк?

Вопрос:
$array_update — массив записей для обновления БД.
Как написать аналогичный запрос на UPDATE нескольких записей по выборочным id ? Учитывая, что записей может обновляться порядка 10-ти штук за 1 раз.
Как должны выглядеть значения массива $array_update ? Обновление Мне необходимо сделать апдейт следующим образом: у меня есть список уникальных id и, соответствующие каждому id , строки для апдейта (данные в строках могут повторяться). Необходимо одним запросом сделать апдейт всех строк, где поле id соответствует текущему id из списка. Почитал про INSERT . ON DUPLICATE KEY UPDATE. пока не понимаю, как применить к моей ситуации.

@lommusic, какое-то странное обновление, где нужно десяток записей изменять. Ощущение, что структура БД не совсем правильно составлена. Данные на обновление для всех записей одинаковы?

Запрос, как обычно, но условие или через OR, или IN: UPDATE table_name SET field = ‘new_value’ WHERE id IN (1,2,50, 100, N); Если вы говорили о каких-то массивах, то в данном случае — это может быть массивом id-шников: $query = «UPDATE table_name SET field = ‘new_value’ WHERE id IN («.implode(‘,’, $array_id).»)»; Кроме того, есть конструкция INSERT . ON DUPLICATE KEY UPDATE, которую так же можно использовать для обновлений, при условии наличия уникальных/первичных ключей. Но в вашем случае, как я понял, этот способ не подойдет.

@Deonis мне необходимо сделать апдейт следующим образом: у меня есть список уникальных id и, соответствующие каждому id, строки для апдейта (данные в строках могут повторяться). Необходимо одним запросом сделать апдейт всех строк, где поле id соответствует текущему id из списка. Почитал про INSERT . ON DUPLICATE KEY UPDATE. пока не понимаю, как применить к моей ситуации.

3 ответа 3

Если хотите использовать ON DUPLICATE KEY UPDATE , то вот пример, как это сделать. Тестировал на tutorialspoint.com:

MariaDB [(none)]> create database test_1; Query OK, 1 row affected (0.00 sec) MariaDB [(none)]> use test_1 Database changed MariaDB [test_1]> create table t1 (id INT NOT NULL AUTO_INCREMENT, name varchar(100), email varchar(100), PRIMARY KEY (id) ); Query OK, 0 rows affected (0.03 sec) MariaDB [test_1]> insert into t1 (name, email) values ('user1', 'user1@gmail.com'), ('user2', 'user2@gmail.com'); Query OK, 2 rows affected (0.02 sec) Records: 2 Duplicates: 0 Warnings: 0 MariaDB [test_1]> select * from t1; +----+-------+-----------------+ | id | name | email | +----+-------+-----------------+ | 1 | user1 | user1@gmail.com | | 2 | user2 | user2@gmail.com | +----+-------+-----------------+ 2 rows in set (0.01 sec) MariaDB [test_1]> INSERT INTO t1 (id, name, email) VALUES (1, 'user1', 'new_email_user1@gmail.com'), (2, 'new_name', 'user2@gmail.com') ON DUPLICATE KEY UPDATE name = VALUES(`name`), email = VALUES(`email`); Query OK, 4 rows affected (0.01 sec) Records: 2 Duplicates: 2 Warnings: 0 MariaDB [test_1]> select * from t1; +----+----------+---------------------------+ | id | name | email | +----+----------+---------------------------+ | 1 | user1 | new_email_user1@gmail.com | | 2 | new_name | user2@gmail.com | +----+----------+---------------------------+ 2 rows in set (0.00 sec) 

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