How to Create a Database with PHP56

In this tutorial, we will learn how to create a database using PHP. We will cover the following topics:
Creating a database connection
Creating a database
Creating a table in a database
Inserting data into a table
Retrieving data from a table
Updating data in a table
Deleting data from a table

Creating a Database Connection

The first step is to create a database connection. We can do this using the following code:```php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "dbname";
// Create connection
$conn = new mysqli($servername, $username, $password, $dbname);
```

The above code will create a connection to the database specified by the $dbname variable. If the connection is successful, the $conn variable will be an object representing the connection. Otherwise, the $conn variable will be false.

Creating a Database

Once we have a database connection, we can create a database using the following code:```php
// Create database
$sql = "CREATE DATABASE my_database";
if ($conn->query($sql) === TRUE) {
echo "Database created successfully";
} else {
echo "Error creating database: " . $conn->error;
}
```

The above code will create a database named my_database. If the database is created successfully, the echo statement will be executed. Otherwise, the echo statement will be executed.

Creating a Table in a Database

Once we have a database, we can create a table in the database using the following code:```php
// Create table
$sql = "CREATE TABLE my_table (
id INT NOT NULL AUTO_INCREMENT,
name VARCHAR(255) NOT NULL,
email VARCHAR(255) NOT NULL,
PRIMARY KEY (id)
)";
if ($conn->query($sql) === TRUE) {
echo "Table created successfully";
} else {
echo "Error creating table: " . $conn->error;
}
```

The above code will create a table named my_table with four columns: id, name, email, and primary key. The id column is the primary key of the table, which means that it is a unique identifier for each row in the table.

Inserting Data into a Table

Once we have a table, we can insert data into the table using the following code:```php
// Insert data
$sql = "INSERT INTO my_table (name, email) VALUES ('John Doe', '@')";
if ($conn->query($sql) === TRUE) {
echo "Data inserted successfully";
} else {
echo "Error inserting data: " . $conn->error;
}
```

The above code will insert a new row into the my_table table with the name John Doe and the email address @.

Retrieving Data from a Table

Once we have data in a table, we can retrieve the data using the following code:```php
// Retrieve data
$sql = "SELECT * FROM my_table";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// Output data of each row
while($row = $result->fetch_assoc()) {
echo "id: " . $row["id"] . " - Name: " . $row["name"] . " - Email: " . $row["email"] . "
";
}
} else {
echo "No results found";
}
```

The above code will retrieve all of the rows from the my_table table and output the data for each row.

Updating Data in a Table

Once we have data in a table, we can update the data using the following code:```php
// Update data
$sql = "UPDATE my_table SET name='Jane Doe' WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "Data updated successfully";
} else {
echo "Error updating data: " . $conn->error;
}
```

The above code will update the name of the row with the id of 1 to Jane Doe.

Deleting Data from a Table

Once we have data in a table, we can delete the data using the following code:```php
// Delete data
$sql = "DELETE FROM my_table WHERE id=1";
if ($conn->query($sql) === TRUE) {
echo "Data deleted successfully";
} else {
echo "Error deleting data: " . $conn->error;
}
```

The above code will delete the row with the id of 1 from the my_table table.

2025-02-18

Previous：Cell Phone Charm Tutorial: Beading Basics

Next：MATLAB Development Tutorial: A Comprehensive Guide for Beginners