java实现连接mysql数据库单元测试查询数据的实例代码

1、按照javaweb项目的要求逐步建立搭建起机构，具体的类包有：model 、db、dao、test;

具体的架构详见下图：

2、根据搭建的项目架构新建数据库test和数据库表t_userinfo并且添加对应的测试数据; (这里我使用的是绿色版的数据库，具体的下载地址：http://pan.baidu.com/s/1mg88YAc)

具体的建立数据库操作详见下图：

3、编写包中的各种类代码，具体参考代码如下：

UserInfo.java

/**
 * FileName:   UserInfo.java
 * @Description: TODO封装对象的信息
 * Copyright: personage
 * Company personage
 * @author:  gaoxing
 * @version  V1.0
 * Createdate:     2014-5-25 下午2:26:41
 *
 * Modification History:
 * Date     Author    Version    Discription
 * -----------------------------------------------------------------------------------
 * 2014-5-25    GX     1.0       1.0
 * Why & What is modified: <修改原因描述>
 */
package com.org.user.model;

/**
 * @ClassName:   UserInfo
 * @Description:TODO封装对象的信息
 * @author:  gaoxing
 * @date:    2014-5-25 下午2:26:41
 */
public class UserInfo {
   private int userid;
    private String username;
    private String password;

/**
   * @Title:    UserInfo
   * @Description:  TODO(描述这个方法的作用)
   * @param:  @param userid
   * @param:  @param username
   * @param:  @param password
   * @throws
   */
  public UserInfo(int userid, String username, String password) {
    super();
    this.userid = userid;
    this.username = username;
    this.password = password;
  }

/**
 * @Title:    UserInfo
 * @Description:  TODO无参的构造方法
 * @param:
 * @throws
 */
public UserInfo() {
  super();
}

public int getUserid() {
    return userid;
  }
  public void setUserid(int userid) {
    this.userid = userid;
  }
  public String getUsername() {
    return username;
  }
  public void setUsername(String username) {
    this.username = username;
  }
  public String getPassword() {
    return password;
  }
  public void setPassword(String password) {
    this.password = password;
  }

}

UserInfoDBManger.java

/**
 * FileName:   UserInfoDBManger.java
 * @Description: TODO 连接数据库的操作
 * Copyright: personage
 * Company personage
 * @author:  gaoxing
 * @version  V1.0
 * Createdate:     2014-5-25 下午2:47:38
 *
 * Modification History:
 * Date     Author    Version    Discription
 * -----------------------------------------------------------------------------------
 * 2014-5-25    GX     1.0       1.0
 * Why & What is modified: <修改原因描述>
 */
package com.org.user.db;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;

/**
 * @ClassName: UserInfoDBManger
 * @Description:TODO连接数据库的操作
 * @author: gaoxing
 * @date: 2014-5-25 下午2:47:38
 */
public class UserInfoDBManger {
  private static Connection conn = null;
  private PreparedStatement ps = null;
  private ResultSet rs = null;

  public static Connection getConn() {
    String url = "jdbc:mysql://localhost:3306/test";
    try {
      Class.forName("com.mysql.jdbc.Driver");
      try {
        conn = (Connection) DriverManager.getConnection(url, "root",
            "mysql");
      } catch (SQLException e) {
        System.out.println(e.getMessage());
      }
    } catch (ClassNotFoundException e) {
      System.out.println(e.getMessage());
    }
    return conn;
  }

  public void close() {
    try {
      rs.close();
      ps.close();
      conn.close();
    } catch (SQLException e) {
      e.getMessage();
    }
  }

}

UserInfoDao.java

/**
 * FileName:   UserInfoDao.java
 * @Description: TODO 处理通过数据库的连接进行操作对象信息
 * Copyright: personage
 * Company personage
 * @author:  gaoxing
 * @version  V1.0
 * Createdate:     2014-5-25 下午2:36:09
 *
 * Modification History:
 * Date     Author    Version    Discription
 * -----------------------------------------------------------------------------------
 * 2014-5-25    GX     1.0       1.0
 * Why & What is modified: <修改原因描述>
 */
package com.org.user.dao;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import com.org.user.db.UserInfoDBManger;
import com.org.user.model.UserInfo;

/**
 * @ClassName:   UserInfoDao
 * @Description:TODO处理通过数据库的连接进行操作对象信息
 * @author:  gaoxing
 * @date:    2014-5-25 下午2:36:09
 */
public class UserInfoDao {
  Connection conn=null;
  PreparedStatement ps=null;
  ResultSet rs=null;
  public  List<UserInfo> find(){
    List<UserInfo> list=new ArrayList<UserInfo>();
    String sql="select * from t_userinfo ";
    conn=UserInfoDBManger.getConn();
    try {
      ps=(PreparedStatement) conn.prepareStatement(sql);
      rs=ps.executeQuery();
      while (rs.next()) {
        UserInfo ui=new UserInfo();
         ui.setUserid(rs.getInt(1));
         ui.setUsername(rs.getString(2));
         ui.setPassword(rs.getString(3));
        list.add(ui);

      }
    } catch (SQLException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return list;
  }
}

UserInfoTest.java

/**
 * FileName:   UserInfoTest.java
 * @Description: TODO测试dao包的方法
 * Copyright: personage
 * Company personage
 * @author:  gaoxing
 * @version  V1.0
 * Createdate:     2014-5-25 下午5:43:03
 *
 * Modification History:
 * Date     Author    Version    Discription
 * -----------------------------------------------------------------------------------
 * 2014-5-25    GX     1.0       1.0
 * Why & What is modified: <修改原因描述>
 */
package com.org.user.test;

import static org.junit.Assert.*;

import java.util.List;

import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

import com.org.user.dao.UserInfoDao;
import com.org.user.model.UserInfo;

/**
 * @ClassName:   UserInfoTest
 * @Description:TODO 测试dao包的方法
 * @author:  gaoxing
 * @date:    2014-5-25 下午5:43:03
 */
public class UserInfoTest {

  /**
   * @Title: setUpBeforeClass
   * @Description: TODO(描述这个方法的作用)
   * @param: @throws java.lang.Exception
   * @return: void
   * @throws
   */
  @BeforeClass
  public static void setUpBeforeClass() throws Exception {
  }

  /**
   * @Title: tearDownAfterClass
   * @Description: TODO(描述这个方法的作用)
   * @param: @throws java.lang.Exception
   * @return: void
   * @throws
   */
  @AfterClass
  public static void tearDownAfterClass() throws Exception {
  }

  /**
   * Test method for {@link com.org.user.dao.UserInfoDao#find()}.
   */
  @Test
  public void testFind() {
     UserInfoDao udao=new UserInfoDao();
     List<UserInfo> list=udao.find();
     for (int i = 0; i < list.size(); i++) {
       UserInfo ui=list.get(i);
       System.out.println("名称: "+ui.getUsername()+"密码: "+ui.getPassword());

    }
  }

}

4、在编写好类内容之后，在搭建项目过程中要加入辅助的JUnit的测试包junit.jar，同时也要导入数据库的连接mysq-connector-java-5.1.7-bin.jar  sqljdbc.jar,这样才可以连接到数据库；

5、所有的工作做好之后，就可以启动服务进行运行了查看结果了，如果在JUnit测试台和控制台出现如下结果就表示项目运行成功了。

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