详解springboot集成mybatis xml方式

springboot集成mybatis

关键代码如下：

1，添加pom引用

<dependency>
 <groupId>org.mybatis.spring.boot</groupId>
 <artifactId>mybatis-spring-boot-starter</artifactId>
 <version>1.1.1</version>
</dependency>
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
  </dependency>

2 application.properties

mybatis.config-locations=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
mybatis.type-aliases-package=com.kerry.model

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = 123456

3 在resource目录下创建mybatis目录并创建mybatis-config.xml文件

<?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>
<settings>
<setting name="callSettersOnNulls" value="true"/>

<setting name="cacheEnabled" value="true"/>

<setting name="lazyLoadingEnabled" value="true"/>

<setting name="aggressiveLazyLoading" value="true"/>

<setting name="multipleResultSetsEnabled" value="true"/>

<setting name="useColumnLabel" value="true"/>

<setting name="useGeneratedKeys" value="false"/>

<setting name="autoMappingBehavior" value="PARTIAL"/>

<setting name="defaultExecutorType" value="SIMPLE"/>

<setting name="mapUnderscoreToCamelCase" value="true"/>

<setting name="localCacheScope" value="SESSION"/>

<setting name="jdbcTypeForNull" value="NULL"/>

</settings>

<typeAliases>
<typeAlias alias="Integer" type="java.lang.Integer" />
<typeAlias alias="Long" type="java.lang.Long" />
<typeAlias alias="HashMap" type="java.util.HashMap" />
<typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
<typeAlias alias="ArrayList" type="java.util.ArrayList" />
<typeAlias alias="LinkedList" type="java.util.LinkedList" />
</typeAliases>
</configuration>

mybatis目录下创建mapper目录存放mapper类接口文件

package com.kerry.mapper;
import java.util.List;
import com.kerry.model.User;
public interface UserMapper {
List<User> getAll();
User getOne(Integer id);
void insert(User user);
void update(User user);
void delete(Integer id);
}

model类文件

package com.kerry.mapper;
import java.util.List;
import com.kerry.model.User;
public interface UserMapper {
List<User> getAll();
User getOne(Integer id);
void insert(User user);
void update(User user);
void delete(Integer id);
}

userMapper.xml

<?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.kerry.mapper.UserMapper" >
 <resultMap id="BaseResultMap" type="com.kerry.model.User" >
   <id column="id" property="id" jdbcType="INTEGER" />
   <result column="name" property="name" jdbcType="VARCHAR" />
   <result column="age" property="age" jdbcType="VARCHAR" />
   <result column="address" property="address" jdbcType="VARCHAR"/>
 </resultMap>

<sql id="Base_Column_List" >
   id, name, age, address
 </sql>

<select id="getAll" resultMap="BaseResultMap" >
   SELECT
   <include refid="Base_Column_List" />
 FROM user
 </select>

<select id="getOne" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
   SELECT
   <include refid="Base_Column_List" />
 FROM user
 WHERE id = #{id}
 </select>

<insert id="insert" parameterType="com.kerry.model.User" >
   INSERT INTO
    user
    (id,name,age,address)
   VALUES
    (#{id},#{name}, #{age}, #{address})
 </insert>

<update id="update" parameterType="com.kerry.model.User" >
   UPDATE
    user
   SET
   <if test="name != null">name = #{name},</if>
   <if test="age != null">age = #{age},</if>
   address = #{address}
   WHERE
    id = #{id}
 </update>

<delete id="delete" parameterType="java.lang.Integer" >
   DELETE FROM
    user
   WHERE
    id =#{id}
 </delete>
</mapper>

controller：

package com.kerry.web;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.kerry.model.User;
import com.kerry.mapper.UserMapper;
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;

@RequestMapping("/getUsers")
public List<User> getUsers() {
List<User> users=userMapper.getAll();
return users;
}

@RequestMapping("/getUser")
 public User getUser(Integer id) {
  User user=userMapper.getOne(id);
   return user;
 }

@RequestMapping("/add")
 public void save(User user) {
  userMapper.insert(user);
 }

@RequestMapping(value="update")
 public void update(User user) {
  userMapper.update(user);
 }

@RequestMapping(value="/delete/{id}")
 public void delete(@PathVariable("id") Integer id) {
  userMapper.delete(id);
 }  
}

最后在启动类上加上 扫描maper interface注解

@SpringBootApplication
@MapperScan("com.kerry.mapper")
public class Application {

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

或者在每个XXMapper类上加上@mapper注解也行  二选一即可

比如

package com.kerry.mapper;
import java.util.List;
import org.apache.ibatis.annotations.Mapper;
import com.kerry.model.User;
@Mapper
public interface UserMapper {
List<User> getAll();
User getOne(Integer id);
void insert(User user);
void update(User user);
void delete(Integer id);
}

个人建议使用直接在启动类上application上@MapperScan方便，一次搞定，不必每写一个mapper类都加上@mapper注解

附上项目结构目录 选中的类以及文件

来源：https://blog.csdn.net/lr131425/article/details/76269236