Read "Practical PHP and MySQL Website Databases A Simplified Approach" by Adrian W. West available from Rakuten Kobo. Sign up today and get $5 off your. PHP Tutorials: Programming with PHP and MySQL - Kindle edition by Paul Gibbs . Use features like bookmarks, note taking and highlighting while reading PHP Tutorials: Kindle Store; ›; Kindle eBooks; ›; Computers & Technology. Abstract. This manual describes the PHP extensions and interfaces that can be used with MySQL. For legal information, see the Legal Notices.
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The column names are keys to the associative array. When there are no more rows in the result set, the function returns FALSE and the while loop terminates.
In the following example, we show how to retrieve a specific row from a table. We must always process the data sent from outside world. Check for validity of the data. This value might come from an XML file or a web form. We will show how to check it. This function escapes special characters in a string for use in an SQL statement. This prevents SQL injection attacks and data corruption. After the variable was processed, it is put into the SQL statement string.
The function fetches a result row as an object. And we use the object notation to get the table columns.
We found the car and printed the whole row to the console. Escaping characters We will have a small example demonstrating how to escape characters.
There are some characters which are considered to be unsafe in a database environment.
One of them is a single quote character. The name of the author is O'Neill. The name has an unsafe single quote character. Column headers Next we will show, how to print column headers with the data from the database table.
Now, we include the names of the columns too. The function return an object containing column information. The name property contains the column name. We count the number of rows and columns returned by a query.
It selects first three rows from the Cars table. Writing images Some people prefer to put their images into the database, some prefer to keep them on the file system for their applications.
Technical difficulties arise when we work with lots of images. Images are binary data. It is located in the same directory as the script name.
The fread function returns the data as string. Reading images In the previous example, we have inserted an image into the database table. Now we are going to read the image back from the table.
There is only one row, containing the image data. Now we should have an image called woman2. We can check if it is the same image that we have inserted into the table. Transaction support A transaction is an atomic unit of database operations against the data in one or more databases.
The effects of all the SQL statements in a transaction can be either all committed to the database or all rolled back. The MySQL database has different types of storage engines. There is a trade-off between data security and database speed. On the other hand, the InnoDB tables are more safe against the data loss. They support transactions.
They are slower to process.
There is no Writer table. But as we see, the first two rows already were changed. In the last example of this tutorial, we are going to recreate the Writers table. This time, the table will be of InnoDB type. It is used to recreate the Writers table. We want to delete three rows from the table. The third SQL statement has an error. Otherwise, we roll them back.