SpringBoot 使用Mybatis+MySql

pom配置

<?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.itstudy</groupId>
    <artifactId>demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>
 
    <name>demo</name>
 
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
 
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/>
    </parent>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <!--<version>1.0.0</version>-->
            <version>1.3.2</version>
            <!--这里一定要指定相关的版本号,否则会集成失败-->
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

src/main/resources/application.properties配置

spring.application.name=mybatis-demo
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/demo?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=123
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
 
spring.thymeleaf.cache=false
spring.thymeleaf.encoding=utf-8
 
mybatis.mapper-locations=classpath:mapper/*.xml

#打印sql语句logging.level.mapper所在包=debug 

logging.level.com.itstudy.mapper=debug

logging.path=./logs/

src/main/resources/mapper/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.itstudy.mapper">
    <resultMap id="BaseResultMap" type="com.itstudy.model.User">
        <id property="id" column="id"/>
        <result property="beginDate" column="begin_date"/>
        <result property="remark" column="remark"/>
        <result property="gmtCreate" column="gmt_create"/>
        <result property="gmtModified" column="gmt_modified"/>
    </resultMap>
    <select id="selectById" resultType="com.itstudy.model.User">
        select * from user where id = #{id}
    </select>
    <select id="getAll" resultMap="BaseResultMap">
        select * from user
    </select>
</mapper>

src/main/java/中的类

package com.itstudy.mapper;
 
import com.itstudy.model.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
 
@Mapper
public interface UserMapper {
 
    /**
     * 注解
     */
    @Select("select * from sys_user where state = #{state}")
    User findByState(@Param("state") String state);
 
    /**
     * xml
     */
    User selectById(int city_id);
 
}

在controller中使用

import com.itstudy.mapper.UserMapper;
import com.itstudy.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
@RestController
public class IndexController {
 
    @Autowired
    private UserMapper userMapper;
 
    @GetMapping("/user")
    public User getUser() {
        return userMapper.selectById(1);
    }
}

项目启动

package com.itstudy;
 
import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class App {
 
    public static void main(String[] args) {
 
        SpringApplication app = new SpringApplication(App.class);
        //关闭banner
        app.setBannerMode(Banner.Mode.OFF);
        app.run(args);
    }
 
}