[fix] Java JDBC SQLSyntaxErrorException: Unknown database

Exception in thread "main" java.sql.SQLSyntaxErrorException: Unknown database 'myDB'
 at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
 at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
 at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:828)
 at com.mysql.cj.jdbc.ConnectionImpl.(ConnectionImpl.java:448)
 at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:241)
 at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)
 at java.sql.DriverManager.getConnection(DriverManager.java:664)
 at java.sql.DriverManager.getConnection(DriverManager.java:247)
 at JDBCInsertExample.main(JDBCInsertExample.java:19)|

As the exception cleary states that the Database that you are trying to access using JDBC does not exist, there are multiple things that might go wrong,

• Make sure you have spelled the database name correctly.
• Database names are case-sensitive, make sure it matches with what is there in your Database (MySQL, Oracle, etc)
• Use database query to validate the database name,

  mysql> show databases;
  +--------------------+
  | Database           |
  +--------------------+
  | information_schema |
  | my_uat             |
  | mysql              |
  | performance_schema |
  | sys                |
  +--------------------+
  5 rows in set (0.07 sec)

  
• Make sure you are connecting to the right Database server (it could be you are on the wrong server uat/staging/local)
• Make sure the database port is correct