利用mybatis怎么对数据库进行增删改查操作

发布时间：2020-12-03 16:47:14 作者：Leah
来源：亿速云阅读：154

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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

Maven Dependencies:

<dependencies> 
    <dependency> 
      <groupId>org.mybatis</groupId> 
      <artifactId>mybatis</artifactId> 
      <version>3.2.7</version> 
    </dependency> 
    <dependency> 
      <groupId>junit</groupId> 
      <artifactId>junit</artifactId> 
      <version>4.9</version> 
      <scope>test</scope> 
    </dependency> 
    <dependency> 
      <groupId>org.apache.derby</groupId> 
      <artifactId>derby</artifactId> 
      <version>10.10.2.0</version> 
    </dependency> 
    <dependency> 
      <groupId>org.apache.derby</groupId> 
      <artifactId>derbyclient</artifactId> 
      <version>10.10.2.0</version> 
    </dependency> 
  </dependencies>

SQL 建表及数据插入（沿用前两节中的数据库表及数据）:

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

<&#63;xml version="1.0" encoding="UTF-8" &#63;>  
<!DOCTYPE configuration  
 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"  
 "http://mybatis.org/dtd/mybatis-3-config.dtd"> 
<configuration> 
  <properties> 
    <property name="driver" value="org.apache.derby.jdbc.ClientDriver" /> 
    <property name="url" 
      value="jdbc:derby://localhost:1527/bjpowernode;create=true" /> 
  </properties> 
  <environments default="development"> 
    <environment id="development"> 
      <transactionManager type="JDBC" /> 
      <dataSource type="POOLED"> 
        <property name="driver" value="${driver}" /> 
        <property name="url" value="${url}" /> 
      </dataSource> 
    </environment> 
  </environments> 
  <mappers> 
    <mapper resource="com/bjpowernode/practice/UserMapper.xml" / 
  </mappers> 
</configuration>

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

package com.bjpowernode.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.xml Mapper文件（src/main/java/com.bjpowernode.practice目录下）

<&#63;xml version="1.0" encoding="UTF-8" &#63;>  
<!DOCTYPE mapper  
 PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"  
 "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> 
<mapper namespace="com.bjpowernode.practice.UserMapper"> 
  <!-- 查询 --> 
  <select id="getUser" resultType="com.bjpowernode.practice.User"> 
    select * 
    from USER_TEST_TB 
  </select> 
  <!-- 插入 --> 
  <insert id="insertUser"> 
    insert into  
      USER_TEST_TB  
    values(#{id},#{username},#{password},#{nickname}) 
  </insert> 
  <!-- 更改 --> 
  <update id="updateUser"> 
    update USER_TEST_TB set 
      USERNAME = #{username}, 
      PASSWORD = #{password}, 
      NICKNAME = #{nickname} 
    where ID = #{id} 
  </update> 
  <!-- 删除 --> 
  <delete id="deleteUser"> 
    delete from USER_TEST_TB WHERE ID=#{id} 
  </delete> 
</mapper>

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

package com.bjpowernode.practice; 
import java.util.List; 
public interface UserMapper 
{ 
  public List<User> getUser(); 
  public void insertUser(User user); 
  public void updateUser(User user); 
  public void deleteUser(int userId); 
}

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

package com.bjpowernode.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() 
  { 
    /** 
     * 准备Mybatis运行环境 
     */ 
    source = "test-mybatis-configuration.xml"; 
    inputStream = TestMyBatis.class.getClassLoader().getResourceAsStream(source); 
    sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream); 
  } 
  @Test 
  public void testGet() 
  { 
    try 
    { 
      // 获取Session连接 
      SqlSession session = sqlSessionFactory.openSession(); 
      // 获取Mapper 
      UserMapper userMapper = session.getMapper(UserMapper.class); 
      // 显示User信息 
      System.out.println("Test Get start..."); 
      this.printUsers(userMapper.getUser()); 
      System.out.println("Test Get finished..."); 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
  @Test 
  public void testInsert() 
  { 
    try 
    { 
      // 获取Session连接 
      SqlSession session = sqlSessionFactory.openSession(); 
      // 获取Mapper 
      UserMapper userMapper = session.getMapper(UserMapper.class); 
      System.out.println("Test insert start..."); 
      // 显示插入之前User信息 
      System.out.println("Before insert"); 
      this.printUsers(userMapper.getUser()); 
      // 执行插入 
      userMapper.insertUser(this.mockUser("FREU_INS_USER", "BJPOWERNODE_INS_PASS", "BJPOWERNODE_INS_NICK")); 
      // 提交事务 
      session.commit(); 
      // 显示插入之后User信息 
      System.out.println("\r\nAfter insert"); 
      this.printUsers(userMapper.getUser()); 
      System.out.println("Test insert finished..."); 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
  @Test 
  public void testUpdate() 
  { 
    try 
    { 
      // 获取Session连接 
      SqlSession session = sqlSessionFactory.openSession(); 
      // 获取Mapper 
      UserMapper userMapper = session.getMapper(UserMapper.class); 
      System.out.println("Test update start..."); 
      // 显示更新之前User信息 
      System.out.println("Before update"); 
      this.printUsers(userMapper.getUser()); 
      // 执行更新 
      userMapper.updateUser(this.mockUser("FREU_UPD_USER", "BJPOWERNODE_UPD_PASS", "BJPOWERNODE_UPD_NICK")); 
      // 提交事务 
      session.commit(); 
      // 显示更新之后User信息 
      System.out.println("\r\nAfter update"); 
      this.printUsers(userMapper.getUser()); 
      System.out.println("Test update finished..."); 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
  @Test 
  public void testDelete() 
  { 
    try 
    { 
      // 获取Session连接 
      SqlSession session = sqlSessionFactory.openSession(); 
      // 获取Mapper 
      UserMapper userMapper = session.getMapper(UserMapper.class); 
      System.out.println("Test delete start..."); 
      // 显示删除之前User信息 
      System.out.println("Before delete"); 
      this.printUsers(userMapper.getUser()); 
      // 执行删除 
      userMapper.deleteUser(this.mockUser(null, null, null).getId()); 
      // 提交事务 
      session.commit(); 
      // 显示删除之后User信息 
      System.out.println("\r\nAfter delete"); 
      this.printUsers(userMapper.getUser()); 
      System.out.println("Test delete finished..."); 
    } 
    catch (Exception e) 
    { 
      e.printStackTrace(); 
    } 
  } 
  /** 
   * 
   * 组装一个User对象 
   * 
   * @return 
   */ 
  public User mockUser(String username, String password, String nickname) 
  { 
    User user = new User(); 
    user.setId(10); 
    user.setUsername(username); 
    user.setPassword(password); 
    user.setNickname(nickname); 
    return user; 
  } 
  /** 
   * 
   * 打印用户信息到控制台 
   * 
   * @param users 
   */ 
  private void printUsers(final List<User> 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()); 
    } 
  } 
}

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利用mybatis怎么对数据库进行增删改查操作

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