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Questions and Answers
What is the most popular database platform used with PHP?
What is the basic reason for server-side programming?
Which of the following is NOT a basic PHP MySQL function?
What is the default username for connecting to a MySQL database server?
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Which function is used to select a database in PHP MySQL?
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What is the purpose of the variable $db in the provided code snippet?
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What function is used to make SQL queries in PHP?
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What does the mysqli_query() function return for queries that retrieve information, such as SELECT?
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What is the recommended practice when a query fails in PHP?
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Which function is used to retrieve a row from a result set as an associative array?
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What does the mysqli_fetch_array() function do?
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What is the purpose of the ORDER BY clause in SQL?
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Study Notes
PHP MySQL and phpMyAdmin
- MySQL is the most popular database platform used with PHP.
- MySQL is an open-source database, relatively easy to set up, and easy to use with PHP.
- Other SQL databases and non-SQL options, such as MongoDB, are also available.
Basic PHP MySQL Functions
- Connecting to a database: use the
mysqli_connect(server, username, password)function. - Default server is "localhost", default username is "root", and default password is empty.
- Selecting a database: use the
mysqli_select_db(connection, dbname)function. - Running a query: use the
mysqli_query(db_resource, query_string)function. - Queries that return information, such as SELECT, return a resource.
- Other queries return TRUE upon success and FALSE on failure.
Database Connection
- A MySQL database server can contain many databases, each of which can contain many tables.
- The connection variable is a database resource type, used to refer to the connection created.
Retrieving Information from a Query
- Loop over the returned
$resultresource, row by row, using themysqli_fetch_assoc()function. -
mysqli_fetch_assoc()turns a row of the result into key-value pairs, where keys are names of the fields and their values are the corresponding values in the table. - Use
mysqli_fetch_array()to access the rows of the result as an array. - Each row in the array equates to the rows that the command line would show you.
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Description
Test your knowledge on the basic concepts of using PHP with MySQL and phpMyAdmin for storing and retrieving dynamic information. Understand the relationship between server-side programming and databases in managing client data. Explore the features of MySQL as an open-source database commonly used with PHP.
