Selecting data from table with UUID as binary() - mysql

Question

I have an AWS RDS Aurora MySQL connection. Following are the steps that I'm following to operate create, insert & fetch the data:
create table:
CREATE TABLE user (
user_id BINARY(16) PRIMARY KEY NOT NULL,
first_name VARCHAR(25) NOT NULL,
last_name VARCHAR(25) NOT NULL,
);
insert into table:
INSERT INTO user VALUES (
UNHEX(REPLACE("9a9cbfga-7426-471a-af27-31be7tb53ii2", "-","")),
"Jon",
"Smith"
);
fetch from table:
SELECT * FROM user WHERE user_id = UNHEX(REPLACE("9a9cbfga-7426-471a-af27-31be7tb53ii2", "-",""));
The handler function that triggers my function to fetch the data goes like:
module.exports.fetchUser = async (event, context, callback) => {
const params = {
resourceArn: 'arn:aws:rds:*********:cluster:************',
secretArn: 'arn:aws:secretsmanager:*************',
sql: 'SELECT * FROM user WHERE user_id = UNHEX(REPLACE("9a9cbfga-7426-471a-af27-31be7tb53ii2", "-",""))',
database: 'dev_db1',
continueAfterTimeout: true,
includeResultMetadata: true
}
try {
const db_res = await rdsDataService.executeStatement(params).promise();
const response = {
body: {
message: 'Data fetched',
data: JSON.stringify(db_res, null, 2)
}
};
callback(null, response);
} catch (error) {
callback(null, error)
}
};
Executing the http data API endpoint for the same results me in this:
{
"body": {
"message": "Data fetched",
"data": [
[
{
"blobValue": {
"type": "Buffer",
"data": [
202,
136,
22,
206,
45,
214,
75,
233,
156,
28,
163,
223,
186,
115,
89,
107
]
}
},
{
"stringValue": "Jon"
},
{
"stringValue": "Smith"
},
]
]
}
}
All I need is to fetch the complete details of all the users (for now I've inserted just one record for ease) in the table user and show the exact user_id instead of the blobValue. Not sure how to convert this UUID binary into redable form like 9a9cbfga7426471aaf2731be7tb53ii2 or 9a9cbfga-7426-471a-af27-31be7tb53ii2 in the response.
I'am bit new to handling queries in MYSQL & Aurora, any help to get me through this will be really appretiated. Thanks in advance.

Answer 1

Mysql 8 has a function for that as https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_bin-to-uuid
and https://dev.mysql.com/doc/refman/8.0/en/miscellaneous-functions.html#function_uuid-to-bin
But you have to do it manually.
As i can't insert your data anywhere the select will do
CREATE TABLE user (
user_id BINARY(16) PRIMARY KEY NOT NULL,
first_name VARCHAR(25) NOT NULL,
last_name VARCHAR(25) NOT NULL
)
INSERT INTO user VALUES (UNHEX(REPLACE("3f06af63-a93c-11e4-9797-00505690773f", "-","")),
"Jon",
"Smith");
SELECT * from user where user_id = UNHEX(REPLACE("3f06af63-a93c-11e4-9797-00505690773f","-",""))
user_id | first_name | last_name
:------ | :--------- | :--------
null | Jon | Smith
SELECT CONCAT(SUBSTRING(HEX(user_id),1,8),'-',
SUBSTRING(HEX(user_id),9,4),'-',
SUBSTRING(HEX(user_id),13,4),'-',
SUBSTRING(HEX(user_id),17,12)) user_id,first_name,last_name FROM user
user_id | first_name | last_name
:------------------------------ | :--------- | :--------
3F06AF63-A93C-11E4-979700505690 | Jon | Smith
db<>fiddle here
But as you need the text anyway, keep the original so you don't need to unhex hex the data again
CREATE TABLE user (
user_id BINARY(16) PRIMARY KEY NOT NULL,
first_name VARCHAR(25) NOT NULL,
last_name VARCHAR(25) NOT NULL,
userid_txt Varchar(3&)
);