


Let's talk about how to use PHP code to modify the contents of the data table
In the process of using a website, application or management system, it is a very common requirement to modify the contents of the data table. Normally, we need to use database management tools or SQL statements to complete modification operations. This article will introduce the use of PHP code to modify the content of the data table.
1. Connect to the database
First, we need to connect to the database in code. Normally, we use Mysqli or PDO extensions to interact with the database. Taking Mysqli as an example, the code to connect to the database is as follows:
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2. Modify the contents of the data table
Next, we can start modifying the contents of the data table. In this article, we assume that we need to modify a row of data in the data table named users
.
- Update data
Updating data usually requires the use of the UPDATE statement. The following is the code to use Mysqli to update data:
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In the above code, we use the UPDATE statement to modify the user name and password to newname
and newpassword
respectively. At the same time, we set the WHERE condition to ensure that only the row of data with id 1 is modified. If the modification is successful, we will see the prompt "Data updated successfully". Otherwise, we will see specific error messages.
- Insert data
In addition to updating data, we may also need to insert new data into the data table. Normally, we use the INSERT statement to complete this operation. The following is the code for inserting data using Mysqli:
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In the above code, we use the INSERT statement to insert new data into the users
data table. Among them, we only filled in the data in the three fields of user name, password and email. If the insertion is successful, we will see the prompt "Data Insertion Successful". Otherwise, we will see specific error messages.
- Delete data
Finally, we may also need to delete specific data rows from the data table. Normally, we use the DELETE statement to complete this operation. The following is the code to use Mysqli to delete data:
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In the above code, we use the DELETE statement to delete the row of data with id 1 from the users
data table. If the deletion is successful, we will see a "Data deletion successful" prompt. Otherwise, we will see specific error messages.
3. Disconnect the database connection
After completing the modification of the data table content, we need to close the connection with the database to release system resources. The following is the code to use Mysqli to close the connection:
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IV. Summary
Through the above code examples, we have introduced the basic operations of using PHP code to modify the contents of the data table. It should be noted that in actual development, we need to strictly verify the input data to ensure the security and correctness of the data. At the same time, we should also choose appropriate extensions based on actual application scenarios to achieve the best performance and ease of use.
The above is the detailed content of Let's talk about how to use PHP code to modify the contents of the data table. For more information, please follow other related articles on the PHP Chinese website!

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