小编use*_*533的帖子

我正在从mybatis3执行mysql查询执行.我是新来的.mybatis 3中的集合和关联映射有什么区别？

具体例子如下.

SELECT e.empid AS empid,e.empname AS empname,
       e.empsalary AS empsalary,p.proname AS proname,p.proid AS proid 
FROM projects p,employees e,projectassigns pa 
WHERE pa.empid=e.empid AND pa.proid=p.proid; 

我需要员工和项目的所有细节.

我给出了如下结果图.

<resultMap id="resultProjects" type="com.pratap.model.ProjAssigns"> 
  <association property="employee" javaType="com.pratap.model.Employee"
               resultMap="resultEmployees" />
  <association property="project" javaType="com.pratap.model.Project"     
               resultMap="resultProjects" />  
</resultMap>

任何人都可以用我的例子或你自己的例子解释这个区别吗？

我对此感到困惑..

谢谢.

在一个servlet中,我有四个变量.我希望将所有这四个变量检索到另一个servlet.

我在servlet 1中使用了如下代码.

import javax.servlet.http.HttpSession;


session.setAttribute("id",id);

在其他servlet中,我试图通过使用代码获取值.

String id = HttpSession.getAttribute("id").toString();

我认为有清晰的方法来跟踪会话变量.

我在网上看过,但都让我感到困惑..

请帮我..

我有一个要求从xml获取数据.

字符串res;

数据将在字符串res中,如下所示.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<person>
  <id>QZhx_w1eEJ</id>
  <first-name>pratap</first-name>
  <last-name>murukutla</last-name>
</person>

我必须从这个数据中获取id和first-name和last-name,并且必须存储在变量id,first-name,last-name中

如何访问xml以获取这些详细信息.

我必须更新我的两列表

import java.sql.*;
import javax.sql.*;

public class User {

    public static void main(String args[]) {
        String id = "QZhx_w1eEJ";
        String created = "true";
        String vmname = "pratap";
        String dbUrl = "jdbc:mysql://localhost:3306/test";
        String dbClass = "com.mysql.jdbc.Driver";

        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection(dbUrl);
            Statement stmt = con.createStatement();
            stmt.executeUpdate("update userprofil set created='" + created
                    + "',vmname='" + vmname + "' where userprofil.id= '" + id
                    + "'");
            con.close();
        } // end try
        catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        catch (SQLException e) { …

我正在尝试使用junit测试用例根据工资对员工对象进行排序.

这是我的员工排序课

package day4;
import day4.Employee;
public class EmployeesInfoWithSalary {
    private Employee[] employee;
    private int numberOfEmployees;
public EmployeesInfoWithSalary(Employee[] employee, int numberOfEmployees) {
    super();
    this.employee = employee;
    this.numberOfEmployees = numberOfEmployees;
}

public Employee[] getSortBasedOnSalary() {

    String temp;
    for (int iterator = 0; iterator < numberOfEmployees; iterator++) {
        int minSalary = employee[iterator].getSalary();
        int index = iterator;
        for (int comparator = iterator; comparator < numberOfEmployees; comparator++) {
            if (employee[comparator].getSalary() < minSalary) {
                index = comparator;
                minSalary = employee[comparator].getSalary();
            }

        }

        employee[index].setSalary(employee[iterator].getSalary());
        employee[iterator].setSalary(minSalary);
        temp …