PHP MySQLi Connection Basics

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Questions and Answers

What is the primary purpose of the `mysqli_close()` function?

To close all open connections to any database.

To check for errors in the last executed query.

To initiate a new database connection.

To free up system resources after database queries. (correct)

Which function would you use to fetch a result row as a numeric array from a query result?

mysqli_fetch_row() (correct)

mysqli_fetch_array()

mysqli_stmt_execute()

mysqli_fetch_assoc()

What benefit does `mysqli_prepare()` provide when executing SQL statements?

It prevents SQL injection by separating data from the query structure. (correct)

It retrieves the last inserted ID directly.

It executes a query immediately after preparation.

It automatically closes the database connection.

Which function can be used to return the ID generated by the last insert query for an AUTO_INCREMENT column?

mysqli_insert_id() Signup and view all the answers

What is the purpose of the `mysqli_stmt_bind_param()` function?

It binds variables to prepared statement parameters. Signup and view all the answers

Which scenario is most appropriate for using `mysqli_error()`?

To provide debug information for an unsuccessful query execution. Signup and view all the answers

In what situation is `mysqli_fetch_assoc()` preferable to `mysqli_fetch_row()`?

When you need to access values by column names instead of numbers. Signup and view all the answers

What does the `mysqli_stmt_execute()` function do?

It executes a prepared statement after parameters have been bound. Signup and view all the answers

How does using prepared statements with `mysqli_prepare()` improve database security?

By preventing SQL injection through parameter binding. Signup and view all the answers

What function would you use to count the number of rows returned from a query?

mysqli_num_rows() Signup and view all the answers

What is the primary purpose of the `mysqli_connect()` function?

To establish a new connection to a MySQL database server. Signup and view all the answers

Which parameter is NOT required by the `mysqli_connect()` function?

$dbname Signup and view all the answers

How can a developer identify issues during a database connection attempt?

By checking <code>mysqli_connect_error()</code> after a failed connection. Signup and view all the answers

Which function would you use to perform a SELECT query on a MySQL database?

mysqli_query() Signup and view all the answers

What does the `mysqli_fetch_assoc()` function return?

A single row as an associative array from a result set. Signup and view all the answers

What is the function of `mysqli_num_rows()`?

To return the number of rows in a result set from a SELECT query. Signup and view all the answers

What is a common use case for `mysqli_query()` in a web application?

To query the database for product details. Signup and view all the answers

Which of the following statements about `mysqli_connect_error()` is true?

It returns an error description if the connection fails. Signup and view all the answers

Study Notes

MySQLi Procedural Keywords Overview

mysqli_connect(): Initializes a connection to a MySQL database server; parameters include server name, username, password, and optional database name; essential for database interaction.
mysqli_connect_error(): Provides error descriptions for the last connection attempt; aids in troubleshooting connectivity issues such as unreachable servers or incorrect credentials.
mysqli_query(): Executes SQL queries (SELECT, INSERT, UPDATE, DELETE) on the connected database; requires a connection resource and the SQL statement; fundamental for data manipulation.
mysqli_fetch_assoc(): Retrieves a single row from query results as an associative array; allows data access using column names, enhancing readability when processing results.
mysqli_num_rows(): Returns the count of rows in a result set from a SELECT query; useful for determining the volume of returned records and managing large data sets.
mysqli_close(): Terminates an active database connection; important for resource management by freeing up system connections post-query execution.
mysqli_error(): Returns error descriptions from the latest MySQLi function call; invaluable for debugging SQL query failures or connection problems.
mysqli_prepare(): Prepares an SQL statement for later execution, with placeholders for data; enhances security by separating the query structure from the actual data to prevent SQL injection.
mysqli_stmt_bind_param(): Binds variables to a prepared statement's parameters while specifying data types; fortifies database security by ensuring data integrity.
mysqli_stmt_execute(): Executes a prepared statement after binding variables; crucial step for running secured SQL queries.
mysqli_fetch_row(): Fetches results as a numeric array; provides an alternative method of data retrieval via column indices, useful for various applications.
mysqli_insert_id(): Retrieves the ID generated by the last query for an AUTO_INCREMENT column; critical for tracking newly inserted records in tables.

Practical Application of MySQLi Functions in a Project

For an online book store, the connection to the database is initiated using mysqli_connect(), enabling access to the book inventory.
User queries for book details utilize mysqli_query() to fetch data based on specific search criteria.
Error handling is performed with mysqli_error() to manage and debug any issues encountered during query execution.
mysqli_fetch_assoc() is employed to display relevant book information, such as title and price, enhancing user experience.
The number of search results is determined using mysqli_num_rows(), informing users how many books matched their query, supporting informed decision-making.
Finally, mysqli_close() is executed to close the database connection, optimizing application performance and resource utilization.

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Description

This quiz covers the essential PHP MySQLi procedural keywords for establishing a connection to a MySQL database. Test your knowledge on functions such as mysqli_connect() and its parameters. Perfect for beginners looking to enhance their backend programming skills.

PHP MySQLi Connection Basics

Podcast Beta

Questions and Answers

What is the primary purpose of the `mysqli_close()` function?

Which function would you use to fetch a result row as a numeric array from a query result?

What benefit does `mysqli_prepare()` provide when executing SQL statements?

Which function can be used to return the ID generated by the last insert query for an AUTO_INCREMENT column?

What is the purpose of the `mysqli_stmt_bind_param()` function?

Which scenario is most appropriate for using `mysqli_error()`?

In what situation is `mysqli_fetch_assoc()` preferable to `mysqli_fetch_row()`?

What does the `mysqli_stmt_execute()` function do?

How does using prepared statements with `mysqli_prepare()` improve database security?

What function would you use to count the number of rows returned from a query?

What is the primary purpose of the `mysqli_connect()` function?

Which parameter is NOT required by the `mysqli_connect()` function?

How can a developer identify issues during a database connection attempt?

Which function would you use to perform a SELECT query on a MySQL database?

What does the `mysqli_fetch_assoc()` function return?

What is the function of `mysqli_num_rows()`?

What is a common use case for `mysqli_query()` in a web application?

Which of the following statements about `mysqli_connect_error()` is true?

Study Notes

MySQLi Procedural Keywords Overview

Practical Application of MySQLi Functions in a Project

Studying That Suits You

Description

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PHP MySQLi Connection Basics

Podcast Beta

Questions and Answers

What is the primary purpose of the mysqli_close() function?

Which function would you use to fetch a result row as a numeric array from a query result?

What benefit does mysqli_prepare() provide when executing SQL statements?

Which function can be used to return the ID generated by the last insert query for an AUTO_INCREMENT column?

What is the purpose of the mysqli_stmt_bind_param() function?

Which scenario is most appropriate for using mysqli_error()?

In what situation is mysqli_fetch_assoc() preferable to mysqli_fetch_row()?

What does the mysqli_stmt_execute() function do?

How does using prepared statements with mysqli_prepare() improve database security?

What function would you use to count the number of rows returned from a query?

What is the primary purpose of the mysqli_connect() function?

Which parameter is NOT required by the mysqli_connect() function?

How can a developer identify issues during a database connection attempt?

Which function would you use to perform a SELECT query on a MySQL database?

What does the mysqli_fetch_assoc() function return?

What is the function of mysqli_num_rows()?

What is a common use case for mysqli_query() in a web application?

Which of the following statements about mysqli_connect_error() is true?

Study Notes

MySQLi Procedural Keywords Overview

Practical Application of MySQLi Functions in a Project

Studying That Suits You

Description

More Like This

MySQL String Functions Quiz

MySQL Quiz: Test Your Skills with SQL Questions

Introduction to MySQL Basics

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What is the primary purpose of the `mysqli_close()` function?

What benefit does `mysqli_prepare()` provide when executing SQL statements?

What is the purpose of the `mysqli_stmt_bind_param()` function?

Which scenario is most appropriate for using `mysqli_error()`?

In what situation is `mysqli_fetch_assoc()` preferable to `mysqli_fetch_row()`?

What does the `mysqli_stmt_execute()` function do?

How does using prepared statements with `mysqli_prepare()` improve database security?

What is the primary purpose of the `mysqli_connect()` function?

Which parameter is NOT required by the `mysqli_connect()` function?

What does the `mysqli_fetch_assoc()` function return?

What is the function of `mysqli_num_rows()`?

What is a common use case for `mysqli_query()` in a web application?

Which of the following statements about `mysqli_connect_error()` is true?