mybatis入门_动力节点Java学院整理

本文为大家分享了mybatis入门学习资料，供大家参考，具体内容如下

所需要用到的其他工具或技术:
项目管理工具 : Maven
测试运行工具 : Junit
数据库 : Derby

废话不多说,直接代码
Maven Dependencies:

 
     
      org.mybatis 
      mybatis 
      3.2.7 
     
     
      junit 
      junit 
      4.9 
      test 
     
     
      org.apache.derby 
      derby 
      10.10.2.0 
     
     
      org.apache.derby 
      derbyclient 
      10.10.2.0 
     
   

SQL 建表及数据插入:

CREATE TABLE USER_TEST_TB( 
ID INT PRIMARY KEY, 
USERNAME VARCHAR(20) NOT NULL, 
PASSWORD VARCHAR(20) NOT NULL, 
NICKNAME VARCHAR(20) NOT NULL 
); 
 
INSERT INTO USER_TEST_TB VALUES(1,'1st','111','Jack'); 
INSERT INTO USER_TEST_TB VALUES(2,'2nd','222','Rose'); 
INSERT INTO USER_TEST_TB VALUES(3,'3rd','333','Will'); 

Mybatis配置文件 src/main/resource源目录下
test-mybatis-configuration.xml

UserMapper.xml  Mapper文件（src/main/java/com.freud.practice目录下）

 
 
 
   
    select * 
    from USER_TEST_TB 
   
 

User.Java对象类（src/main/java/com.freud.practice目录下）

package com.freud.practice; 
 
public class User 
{ 
 
  private Integer id; 
 
  private String username; 
 
  private String password; 
 
  private String nickname; 
 
  public Integer getId() 
  { 
    return id; 
  } 
 
  public void setId(Integer id) 
  { 
    this.id = id; 
  } 
 
  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; 
  } 
 
  public String getNickname() 
  { 
    return nickname; 
  } 
 
  public void setNickname(String nickname) 
  { 
    this.nickname = nickname; 
  } 
 
} 

UserMapper.java Mapper类（src/main/java/com.freud.practice目录下）

package com.freud.practice; 
 
import java.util.List; 
import org.apache.ibatis.annotations.Select; 
 
public interface UserMapper 
{ 
  //@Select("SELECT * FROM USER_TEST_TB") 
  public List getUser(); 
} 

测试类TestMyBatis.java（src/test/java/com.freud.practice目录下）

package com.freud.practice; 
 
import java.io.InputStream; 
import java.text.MessageFormat; 
import java.util.List; 
 
import org.apache.ibatis.session.SqlSession; 
import org.apache.ibatis.session.SqlSessionFactory; 
import org.apache.ibatis.session.SqlSessionFactoryBuilder; 
import org.junit.Before; 
import org.junit.Test; 
 
public class TestMyBatis 
{ 
 
  private String source; 
 
  private InputStream inputStream; 
 
  private SqlSessionFactory sqlSessionFactory; 
 
  @Before 
  public void setUp() 
  { 
    source = "test-mybatis-configuration.xml"; 
  } 
 
  @Test 
  public void testXMLConfingureSessionFactory() 
  { 
    try 
    { 
      inputStream = TestMyBatis.class.getClassLoader().getResourceAsStream(source); 
      sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 
      SqlSession session = sqlSessionFactory.openSession(); 
 
      List users = (List) session.selectList("com.freud.practice.UserMapper.getUser"); 
      System.out.println("Query by XML configuration..."); 
      this.printUsers(users); 
 
      UserMapper userMapper = session.getMapper(UserMapper.class); 
      System.out.println("\r\nQuery by annotation configuration..."); 
      this.printUsers(userMapper.getUser()); 
 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
 
  private void printUsers(final List users) 
  { 
    int count = 0; 
 
    for (User user : users) 
    { 
      System.out.println(MessageFormat.format("==User[{0}]=================", ++count)); 
      System.out.println("User Id: " + user.getId()); 
      System.out.println("User UserName: " + user.getUsername()); 
      System.out.println("User Password: " + user.getPassword()); 
      System.out.println("User nickname: " + user.getNickname()); 
    } 
  } 
} 

以上是使用XML作为Mapper配置文件的一个入门，其实Mybatis还支持Annotation的方式，具体操作如下：

1. 打开UserMapper.java中的注释。
2. 打开test-mybatis-configuration.xml中的注释，并注释掉现有的Mapper
3. 删除UserMapper.xml文件

这种是Mybatis的Annotation方式的Mapper配置。个人比较偏向于XML方式，所以后续的教程会更倾向于XML配置的方式来写。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。