如何将MySQL查询结果导入ArrayList <object>

Question

I have SQL query which results in multiple columns. I want to execute this query and get the results into my ArrayList<> instead of the ResultSet . My class for the column definitions is

public class Record{
    private String FileName;
    private String FileID;
    private String Loan;
    private String Page;
}

Query is :

String query = "SELECT FileName, FileID, loanNumnber, PageNumber FROM table";
ResultSet rs = stmt.executeQuery(query);

I want the results of the query in recordData object.

ArrayList<Record> recordData = new ArrayList<Record>;

Please suggest how the arraylist can be populated directly with correct mapping.

Answer 1

Use following code snippet if you want to implement by yourself. It will convert the result set to Record objects and add it to the ArrayList .

Record record;
while(rs.next()){

     record = new record();

     String fileName  = rs.getString("FileName");
     String fileID = rs.getString("FileID");
     String loanNumnber = rs.getString("loanNumnber");
     String pageNumber = rs.getString("PageNumber");

    record.setFileName(fileName);
    record.setFileID(fileID);
    record.setLoan(loanNumnber);
    record.setPage(pageNumber);

    recordData.add(record)
}

rs.close();

Otherwise, if you want to use any third party frameworks then there are lot of options such as Hibernate, iBatis etc.

Answer 2

You can use the mybatis. Please use the ORM.

https://en.wikipedia.org/wiki/Object-relational_mapping

Answer 3

You should use OR mapper like Hibernate. Thanks POJO classes you can do whan you want. Some readings:

http://www.tutorialspoint.com/hibernate/hibernate_examples.htm

http://www.mkyong.com/tutorials/hibernate-tutorials/

Answer 4

在代码中的这一行添加括号“（）”，使它看起来像这样：

ArrayList<Record> recordData = new ArrayList<Record>();