How to convert integer to IP address using INET_NTOA function in MySQL

How to use the INET_NTOA function in MySQL to convert an integer to an IP address

When developing and managing database applications, you often encounter situations where you need to convert an integer to an IP address. MySQL provides a very convenient function INET_NTOA that can help us implement this function. This article will introduce how to use the INET_NTOA function in MySQL to convert an integer to an IP address and provide relevant code examples.

First of all, let’s first understand the role of the INET_NTOA function. The function of the INET_NTOA function is to convert an IP address stored as an integer into dotted decimal form. That is, it converts a 32-bit integer into the form of an IPv4 address. The following is the syntax of the INET_NTOA function:

INET_NTOA(expr)

where expr is a 32-bit integer representing the IP address.

Next, let’s take a look at how to use the INET_NTOA function to convert an integer to an IP address.

First, we need to create a sample table to store IP addresses in integer form. We can create a table named ip_addresses using the following SQL statement:

CREATE TABLE ip_addresses (

id INT PRIMARY KEY AUTO_INCREMENT,
ip_address INT

);

Then, we insert some sample data into the table . Suppose we have the following two IP addresses in the form of integers:

-2147483648 (corresponding IP address is 0.0.0.0)
-3232235776 (corresponding IP address is 192.168.0.0)

We can use the following SQL statement to insert these two pieces of data:

INSERT INTO ip_addresses (ip_address) VALUES (-2147483648), (-3232235776);

Now, we can use the INET_NTOA function Convert an integer to an IP address. The following is an example query statement:

SELECT id, INET_NTOA(ip_address) AS ip_address FROM ip_addresses;

This query statement will convert the IP address in integer form into dotted decimal form, and Return the result set. Sample output is as follows:

id	ip_address
1	0.0.0.0
2	192.168.0.0

##The above example demonstrates how to use INET_NTOA Function converts an integer to an IP address. By using this function, we can easily convert an IP address in integer form to a more readable dotted decimal form.

In actual applications, we can use this function together with other MySQL functions and statements to perform more complex query and conversion operations. Additionally, we can use the INET_ATON function to convert an IP address in dotted decimal form to an integer. This way, we can easily convert between integers and IP addresses when needed.

-- 创建示例表
CREATE TABLE ip_addresses (
    id INT PRIMARY KEY AUTO_INCREMENT,
    ip_address INT
);

-- 插入示例数据
INSERT INTO ip_addresses (ip_address) VALUES (-2147483648), (-3232235776);

-- 查询并转换整数为IP地址
SELECT id, INET_NTOA(ip_address) AS ip_address FROM ip_addresses;

Summary:

This article describes how to use the INET_NTOA function in MySQL to convert an integer to an IP address. By creating a sample table and inserting sample data, we demonstrated how to use the INET_NTOA function to convert an integer to a dotted decimal IP address, and gave relevant code examples. By mastering the use of this function, we can convert integers and IP addresses in actual applications, improving the flexibility and efficiency of database applications.

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