connect mysql database to netbeans and (store and retrieve) using entity and controller classes

the code has already done on netbeans. all that i need is to use the entity and controllers classes to retrieve and store data from the interface of netbeans to mysql database. these are the needed functions of the project. they are already wrriten as a code but they have to be linked to the database: project name: scientific conference management Editor functions: 1- search papers description: Step1 : user enters the topic and the author of the paper as text field Step1: system display the PDF paper if found in the database, otherwise the system will display an error message as label ----------- 2- chose reviewer for a paper: description: Step1: user types the paper topic as text field Step2: system displays list of paper topics with their ids and authors as a table Step3: user types the required id that has been take from the table then the user choose the reviewer from a combo box Step4: user click assign button to assign reviewer to the paper then store it in the database----------- 3- the editor should be able to assign 1 more reviewer to a certain paper if the first two reviewers have a disagreement (one accepts the paper while the other one doesn't). ----------- 4- the editor should be able to view the following dates of a paper: editor decision date, paper submission date, paper status, paper status is: 1- not reviwed: if there are no reviwers assigned to the paper 2- in reviwing: if there are reviewers assigned to the paper 3- reviewed: if any of the 2 reviewers create feedback and recommendation the paper ----------- 3-view feedback/recommendation of reviewers (recommendation is either acceptance or rejection of the paper ) description: 1-Step1: user enter paper topic and author name as text fields 2-Step2: system displays the feedback and recommendation of the paper ----------- ----------- Author functions: 1-submit paper to a specific conference under a specific topic description: step1: user clicks browse button to upload a PDF file. Step2: user choose a specific conference from a combo box for the chosen paper. step3: user types a paper title as a text field Step4: user click submit to store the selected PDF paper in the database. ----------- 1- the author should be able to download his submitted paper. ----------- 2- the author should be able to view the following : author registration date,editor decision date, paper submission date, submitted paper status. (paper status could be: not reviewed, in reviewing, reviewed) ----------- 3-view feed-back/recommendation of reviewers on specific submitted paper (recommendatio is either rejection or acceptance of the paper) description: step1: user types author name and paper title as text fields step2: system displays the feedback and recommendation of the paper ----------- 4- view editor's decision about a paper description: step1: user types author name and paper title as text fields step2: system displays the editor decision of the paper