How to get Jenkins credentials variable in all stages of my Jenkins Declarative Pipeline - jenkins

Question

How do I get Jenkins credentials variable i.e "mysqlpassword" accessible to all stages of my Jenkins Declarative Pipeline?
The below code snippet works fine and prints my credentials.
node {
stage('Getting Database Credentials') {
withCredentials([usernamePassword(credentialsId: 'mysql_creds', passwordVariable: 'mysqlpassword', usernameVariable: 'mysqlusername')])
{
creds = "\nUsername: ${mysqlusername}\nPassword: ${mysqlpassword}\n"
}
println creds
}
}
How can I incorporate the above code in my current pipeline so that mysqlusername & mysqlpassword variables are accessible to all stages across the pipeline script i.e globally.
My pipeline script layout looks like below:
pipeline { //indicate the job is written in Declarative Pipeline
agent { label 'Prod_Slave' }
environment {
STAGE_2_EXECUTED = "0"
}
stages {
stage ("First Stage") {
steps {
echo "First called in pipeline"
script {
echo "Inside script of First stage"
}
}
} // end of first stage
stage ("Second Stage") {
steps {
echo "Second stage called in pipeline"
script {
echo "Inside script of Second stage"
}
}
} // end of second stage
} //end of stages
} // end of pipeline
I m on the latest version of Jenkins.
Requesting solutions. Thank you.

Answer 1

You can do something like this. Here, you define you variables under environment { } and use it throughout your stages.
pipeline {
agent any
environment {
// More detail:
// https://jenkins.io/doc/book/pipeline/jenkinsfile/#usernames-and-passwords
MYSQL_CRED = credentials('mysql_creds')
}
stages {
stage('Run Some Command') {
steps{
echo "Running some command"
sh '<some-command> -u $MYSQL_CRED_USR -p $MYSQL_CRED_PSW'
}
}
}
Variables defined under environments are global to all the stages so can be used in the whole jenkinsfile.
More information about credentials() in official documentation.