下面小編就為大家?guī)?lái)一篇java實(shí)現(xiàn)連接mysql數(shù)據(jù)庫(kù)單元測(cè)試查詢(xún)數(shù)據(jù)的實(shí)例代碼。小編覺(jué)得挺不錯(cuò)的，現(xiàn)在就分享給大家，也給大家做個(gè)參考。一起跟隨小編過(guò)來(lái)看看吧

1、按照javaweb項(xiàng)目的要求逐步建立搭建起機(jī)構(gòu)，具體的類(lèi)包有：model 、db、dao、test;

具體的架構(gòu)詳見(jiàn)下圖：

2、根據(jù)搭建的項(xiàng)目架構(gòu)新建數(shù)據(jù)庫(kù)test和數(shù)據(jù)庫(kù)表t_userinfo并且添加對(duì)應(yīng)的測(cè)試數(shù)據(jù); (這里我使用的是綠色版的數(shù)據(jù)庫(kù)，具體的下載地址：http://pan.baidu.com/s/1mg88YAc)

具體的建立數(shù)據(jù)庫(kù)操作詳見(jiàn)下圖：

3、編寫(xiě)包中的各種類(lèi)代碼，具體參考代碼如下：

UserInfo.java

/**
 * FileName:   UserInfo.java
 * @Description: TODO封裝對(duì)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封裝對(duì)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(描述這個(gè)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無(wú)參的構(gòu)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 連接數(shù)據(jù)庫(kù)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連接數(shù)據(jù)庫(kù)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 處理通過(guò)數(shù)據(jù)庫(kù)的連接進(jìn)行操作對(duì)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處理通過(guò)數(shù)據(jù)庫(kù)的連接進(jìn)行操作對(duì)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測(cè)試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 測(cè)試dao包的方法
 * @author:  gaoxing
 * @date:    2014-5-25 下午5:43:03
 */
public class UserInfoTest {
 
  /**
   * @Title: setUpBeforeClass
   * @Description: TODO(描述這個(gè)方法的作用)
   * @param: @throws java.lang.Exception 
   * @return: void 
   * @throws
   */
  @BeforeClass
  public static void setUpBeforeClass() throws Exception {
  }
 
  /**
   * @Title: tearDownAfterClass
   * @Description: TODO(描述這個(gè)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("名稱(chēng): "+ui.getUsername()+"密碼: "+ui.getPassword());
 
    }
  }
 
}

4、在編寫(xiě)好類(lèi)內(nèi)容之后，在搭建項(xiàng)目過(guò)程中要加入輔助的JUnit的測(cè)試包junit.jar，同時(shí)也要導(dǎo)入數(shù)據(jù)庫(kù)的連接mysq-connector-java-5.1.7-bin.jar sqljdbc.jar,這樣才可以連接到數(shù)據(jù)庫(kù)；

5、所有的工作做好之后，就可以啟動(dòng)服務(wù)進(jìn)行運(yùn)行了查看結(jié)果了，如果在JUnit測(cè)試臺(tái)和控制臺(tái)出現(xiàn)如下結(jié)果就表示項(xiàng)目運(yùn)行成功了。