Introduction to PostgreSQL MD5 Function
PostgreSQL MD5 function is used to convert a string into 32 character text string in PostgreSQL, It is used in a critical application where the security of data is a major concern. MD5 is a cryptographic hash function that is used to generate a 32 character text string which is a text hexadecimal value representation of a checksum of 128 bit. MD5 algorithm in PostgreSQL designed in 128 bit it is encryption algorithm in PostgreSQL designed to convert a string into 32 character text string. MD5 function is very useful and important in PostgreSQL.
Syntax:
- Md5 (string (Any character string that we want to convert into 32 character text string ))
- Select column_name1, md5 (Column_name2 (Column name that we have used to convert string into 32 character text string)), md5(column_name3(Column name that we have used to convert string into 32 character text string)), .., Column_nameN from table_name;
- Select MD5 (‘String’);
Parameters of PostgreSQL MD5
Below is the parameter description of the above syntax are as follows:
- MD5: MD5 is a cryptographic hash function that is used to generate a 32 character text string which is a text hexadecimal value representation of a checksum of 128 bit. MD5 function is very useful and important in PostgreSQL.
- String: Any character string that we want to convert into 32 character text string in PostgreSQL. We can use any string to convert a string into a 32-bit text string.
- Select: Select is used to select any character string to convert into 32 character text string in PostgreSQL.
- Column 1 to Column N: Column name used to convert the data into text string in PostgreSQL.We can convert character data type column data into 32 character text string.
- Table Name: Table name used to display the data from a specified table in PostgreSQL.
How PostgreSQL MD5 Function Works?
- MD5 function in PostgreSQL accepts the one string or argument as input string while we convert a string into a text string.
- It is used in a critical applications where the security of data is a major concern.
- MD5 function is very useful and important in PostgreSQL.
- This function is used to convert string into 32 character text string in PostgreSQL.
- We can use a MD5 function at the time of user creation to provide encrypted password for user in PostgreSQL.
- MD5 function will consider every word as string in PostgreSQL. It will work only string not for integer value.
- Below example shows that it will consider every string as character not an integer value. To convert string into text string we need to define a string in a single quote.
select MD5 (10);
select MD5 ('10');
- In the above first example, we have passed 10 values without single quote when we passing this value it will show error that the MD5 function did not exist.
- But when we pass the 10 value in a single quote it will display the 32 character string.
- MD5 function is not work in integer data type data. In below example data type while we have to display emp_id of integer types it will not display the data it will show an error.
select MD5 (emp_id) from Employee limit 2;
select MD5 (emp_name) from Employee limit 2;
- In the above figure first example we have retrieved data from integer data type column same time it will shows an error. But when we have retrieving data from character data type it will not issue an error it will display result in 32 character string in text format.
Examples to Implement MD5 Function in PostgreSQL
- Below is the example of MD5 function in PostgreSQL are as follows.
- We have using employee table to describe example of MD5 function in PostgreSQL are as follows.
select * from employee;
Figure: Example of employee table to describe example of MD5 function in PostgreSQL.
1. Convert single string into 32 bit String
Below is the example to convert single string into 32 bit character text string in PostgreSQL. In below example we have converting ABC string into 32 bit character text string.
select MD5 ('ABC');
In above example ABC string will return “902fbdd2b1df0c4f70b4a5d23525e932” string using a MD5 function in PostgreSQL.
2. Convert Table Data
The below example show to convert character string into 32 Bit text string in PostgreSQL.
SELECT emp_id, md5 (emp_name), md5 (emp_address), emp_phone, emp_salary, date_of_joining FROM employee;
In above example we have converting an emp_name and emp_address column in 32 string text format using md5 functions in PostgreSQL.
3. MD5 Function using UUID
Below example shows how UUID function works using a MD5 function in PostgreSQL.
SELECT md5('MD5 String')::uuid;
Advantages of PostgreSQL MD5
- MD5 function in PostgreSQL used to convert string into 32 character text string.
- MD5 function is used in critical function where data security is major concern. MD5 function is very important in PostgreSQL.
- MD5 function is used to convert character string into text string.
- We can use MD5 function to store user password in text format.
- We used MD5 function for data security and privacy in critical application.
Conclusion
MD5 function is used to convert string into 32 character text string, it’s used in critical application where security is major concern. MD5 is cryptographic hash function which is used to generate a 32 character text string which is text hexadecimal value representation of a checksum of 128 bit.
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