Question

I made a script for connecting to database and changing data in specific column for definitely number.
Now i want read a numbers from text file with specific extension, making changes for those numbers in database and then rename file with .bak extension.
help me, please. i appreciate your help in advance!

import groovy.sql.Sql
sql = Sql.newInstance('jdbc:mysql://localhost:3306/database', 'login', 'password', 'com.mysql.jdbc.Driver')
int rowsAffected = sql.executeUpdate('update tablename set column = '01' where number=$NumberFromFile')
println "updated: ${rowsAffected}"

Answer 1

Something like this should work:

def newValue = '01'

new File( '/path/to/data.input' ).with { file ->
  file.withReader { reader ->
    new Scanner( reader ).useDelimiter( ';' ).with { scanner ->
      while( scanner.hasNext() ) {
        sql.executeUpdate "UPDATE tablename SET column=$newValue WHERE number=${scanner.nextInt()}"
      }
    }
  }
  file.renameTo( new File( file.parent, "${file.name}.bak" ) )
}

Obviously, you probably want to do it in a transaction, or a batch, but this should give you the idea