Mybatis初始环境搭建以及简单的入门案例

逃离我推掉我的手 2022-12-29 02:18 285阅读 0赞

> IDEA初始化 Mybatis 初始环境搭建，配置到入门案例

我用的IDEA是：![在这里插入图片描述][20201219155412917.png]  
*（好像不同版本初始化有一点点差异，点击下一步就行了）*

[**IDEA 需要配置Maven环境**][IDEA _Maven]准本好之后就可以了：

## Mybatis的环境搭建： ##

1.   第一步：创建Maven工程， 并导入坐标.
2.   第二步：创建实体类和dao接口
3.   第三步：创建MyBatis主配置文件
4.   第三步：创建映射配置文件

这里我建好的文件可以参考：[链接][Link 1]（包含数据库文件）

**1、新建项目：**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk3NzMyNw_size_16_color_FFFFFF_t_70]  
2、选择Maven项目，点击Create from archetype，然后点击next  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk3NzMyNw_size_16_color_FFFFFF_t_70 1]  
3、输入项目名称，学习阶段，分好名称顺序，方便后期回顾查看自己的代码  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk3NzMyNw_size_16_color_FFFFFF_t_70 2]  
4、选择自动导入：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk3NzMyNw_size_16_color_FFFFFF_t_70 3]

**5、pom.xml文件配置：**

导入了：

*  Mybatis的依赖
 *  Mysql的依赖
 *  日志的依赖
 *  单元测试的依赖

打包方式使用了Jar包（下面代码第10行）

*对比自己文件中那些不一样复制过去*

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.wss</groupId>
        <artifactId>day01_mybatis01test</artifactId>
        <version>1.0-SNAPSHOT</version>
    	<packaging>jar</packaging>
    <dependencies>
        
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.6</version>
        </dependency>
        
        
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.49</version>
        </dependency>
        
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
    
        
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13</version>
            <scope>test</scope>
        </dependency>
    
    
    </dependencies>
    </project>

**6、创建实体类和dao接口：**

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk3NzMyNw_size_16_color_FFFFFF_t_70 4]  
**User类**

package com.wss.domain;
    
    import java.io.Serializable;
    import java.util.Date;
    
    //启用序列化 --> 接口Serializable
    public class User implements Serializable { 
        private Integer id;
        private  String username;
        private Date birthday;
        private String sex;
        private String  address;
    
        @Override
        public String toString() { 
            return "User{" +
                    "id=" + id +
                    ", username='" + username + '\'' +
                    ", birthday=" + birthday +
                    ", sex='" + sex + '\'' +
                    ", address='" + address + '\'' +
                    '}';
        }
    
        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 Date getBirthday() { 
            return birthday;
        }
    
        public void setBirthday(Date birthday) { 
            this.birthday = birthday;
        }
    
        public String getSex() { 
            return sex;
        }
    
        public void setSex(String sex) { 
            this.sex = sex;
        }
    
        public String getAddress() { 
            return address;
        }
    
        public void setAddress(String address) { 
            this.address = address;
        }
    }

**IuserDao接口:**

package com.wss.dao;
    
    import com.wss.domain.User;
    
    import java.util.List;
    
    public interface IuserDao { 
        /** * 查询所有操作 * @return */
        List<User> findAll();
    
        /** * 保存用户 * @param user * @return */
        void saveUser(User user);
    
        /** * 更新用户信息 * @param user */
        void updateUser(User user);
    
        /** * 删除用户 * @param id */
        void deleteUser(Integer userId);
    
        /** * 根据id查询指定用户 * @param userId * @return */
        User findById(Integer userId);
         /** * 根据名称模糊查询 * @param name * @return */
        List<User> findByName(String name);
    
    }

**7、创建MyBatis主配置文件**

在resources目录下的SqlMopConfig.xml文件

![在这里插入图片描述][20201219164538535.png]  
代码：

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
    
    <configuration>
        
        <environments default="mysql">
            
            <environment id="mysql">
                
                <transactionManager type="JDBC"></transactionManager>
                
                <dataSource type="POOLED">
                    
                    <property name="driver" value="com.mysql.jdbc.Driver"/>
                    <property name="url" value="jdbc:mysql://localhost:3306/test"/>
                    <property name="username" value="root"/>
                    <property name="password" value="root"/>
                </dataSource>
            </environment>
        </environments>
        
        <mappers>
            <mapper resource="com/wss/dao/IUserDao.xml"/>
        </mappers>
    </configuration>

另一个文件：log4j.properties 文件：

# Set root category priority to INFO and its only appender to CONSOLE.
    #log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
    log4j.rootCategory=debug, CONSOLE, LOGFILE
    
    # Set the enterprise logger category to FATAL and its only appender to CONSOLE.
    log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE
    
    # CONSOLE is set to be a ConsoleAppender using a PatternLayout.
    log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
    log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
    log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n
    
    # LOGFILE is set to be a File appender using a PatternLayout.
    log4j.appender.LOGFILE=org.apache.log4j.FileAppender
    log4j.appender.LOGFILE.File=d:\axis.log
    log4j.appender.LOGFILE.Append=true
    log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
    log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %m\n

**8、创建映射配置文件：**

注意：mybatis的映射配置文件位置必须和dao接口的包结构相同（不用在意1.xml和2.xml）创建包时需要一层一层创建

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mzk3NzMyNw_size_16_color_FFFFFF_t_70 5]  
IUserDao.xml内容：

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    
    <mapper namespace="com.wss.dao.IuserDao">
    <select id="findAll" resultType="com.wss.domain.User" >
        select * from user
    </select>
        
        <insert id="saveUser" parameterType="com.wss.domain.User">
    
    <selectKey keyProperty="id" keyColumn="id" order="AFTER" resultType="java.lang.Integer">
        select last_insert_id();
    </selectKey>
            insert into user(username,birthday,sex,address)values(#{username},#{birthday},#{sex},#{address})
            
        </insert>
        <update id="updateUser" parameterType="com.wss.domain.User">
            update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
        </update>
    
        <delete id="deleteUser" parameterType="java.lang.Integer">
            delete from user where id=#{uid}
        </delete>
    
        <select id="findById" parameterType="java.lang.Integer" resultType="com.wss.domain.User">
            select * from user where id=#{uid}
        </select>
    
        <select id="findByName" parameterType="String" resultType="com.wss.domain.User">
            select * from user where username like #{name}
        </select>
    
    
     
    </mapper>

测试类：位于test目录下  
![在这里插入图片描述][20201219170629600.png]

MybatisTest.java

package com.wss.test;
    
    import com.wss.dao.IuserDao;
    import com.wss.domain.User;
    import org.apache.ibatis.io.Resources;
    import org.apache.ibatis.session.SqlSession;
    import org.apache.ibatis.session.SqlSessionFactory;
    import org.apache.ibatis.session.SqlSessionFactoryBuilder;
    import org.junit.After;
    import org.junit.Before;
    import org.junit.Test;
    
    import java.io.IOException;
    import java.io.InputStream;
    import java.util.Date;
    import java.util.List;
    
    public class MybatisTest { 
    
        private InputStream in;
        private SqlSession session;
        private IuserDao userDao;
    
        @Before
        public void init() throws IOException { 
            //1、读取配置文件
             in = Resources.getResourceAsStream("SqlMapConfig.xml");
            //2、创建SqlSessionFactory工厂
            SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
            SqlSessionFactory factory = builder.build(in);
            //3、使用工厂生产SqlSession
             session = factory.openSession();
            //4、使用SqlSession创建Dao接口代理对象
             userDao = session.getMapper(IuserDao.class);
    
        }
    
        @After
        public void destory() throws IOException { 
           // 事务提交
            session.commit();
            session.close();
            in.close();
        }
    
        /** * 测试查询所有 */
        @Test
        public void FindAll() throws IOException { 
            //5、使用代理对象执行方法
    
            List<User> users = userDao.findAll();
            for (User u : users) { 
                System.out.println(u);
            }
            //6、释放资源
    
        }
    
        @Test
        public void testSave() throws IOException { 
            User user = new User();
            user.setUsername("东方纤云");
            user.setAddress("异世界");
            user.setBirthday(new Date());
            user.setSex("男");
            System.out.println("保存操作之前"+user);
            userDao.saveUser(user);
            System.out.println("保存操作之后"+user);
        }
    
        /** * 更新用户信息 * @throws IOException */
        @Test
        public void testUpdate() throws IOException { 
            User user = new User();
            user.setId(50);
            user.setUsername("东方纤云");
            user.setAddress("原世界");
            user.setBirthday(new Date());
            user.setSex("男");
            userDao.updateUser(user);
        }
    
        /** * 删除指定用户 * @throws IOException */
        @Test
        public void testDelete() throws IOException { 
    
            userDao.deleteUser(50);
        }
    
        /** * 查找指定用户 * @throws IOException */
        @Test
        public void testFindOne() throws IOException { 
            User user = userDao.findById(48);
            System.out.println(user);
        }
    
        /** * 测试模糊查询 * @throws IOException */
        @Test
        public void testFindByName() throws IOException { 
            List<User> users = userDao.findByName("%王%");
            for(User user:users)
            System.out.println(user);
        }
    
    
    }

[20201219155412917.png]: /images/20221120/05d4d1d238bd4c8197ec457760733aa2.png
[IDEA _Maven]: https://blog.csdn.net/weixin_43977327/article/details/107310364
[Link 1]: https://download.csdn.net/download/weixin_43977327/13730780
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[20201219164538535.png]: /images/20221120/860d019f88ac4d0fb8ead5972ccd6246.png
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[20201219170629600.png]: /images/20221120/88b482473f074db1b91113bcecb8b9fa.png