在软件开发中,数据库的引入是必不可少的,其中又属mysql使用最为广泛,而在springboot中,集成使用mysql的方式有很多(例如jpa),这里来展现一下通过mybatis框架在springboot中使用mysql。
依赖引入
首先在使用初始化工程的时候加入mybatis、mysql相关的依赖,如下所示:
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< dependencies >
< dependency >
< groupId >org.springframework.boot</ groupId >
< artifactId >spring-boot-starter</ artifactId >
</ dependency >
< dependency >
< groupId >org.mybatis.spring.boot</ groupId >
< artifactId >mybatis-spring-boot-starter</ artifactId >
< version >2.0.1</ version >
</ dependency >
< dependency >
< groupId >mysql</ groupId >
< artifactId >mysql-connector-java</ artifactId >
< scope >runtime</ scope >
</ dependency >
< dependency >
< groupId >com.alibaba</ groupId >
< artifactId >druid</ artifactId >
< version >1.1.10</ version >
</ dependency >
</ dependencies >
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配置引入
在配置方面,使用springboot的自动配置功能配置数据源,如下所示:
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spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
url: jdbc:mysql://127.0.0.1:3306/sbac_master?autoReconnect=true&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
username: root
password: 1234
driver-class-name: com.mysql.cj.jdbc.Driver
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配置了数据源,剩下的就是引入mybatis了。mybatis的引入同样可以使用自动配置(MybatisProperties)来实现,这里选择不全部使用自动配置属性,而是引入mybatis的配置文件方式注入属性。
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mybatis:
config-location: classpath:mybatis-config.xml
mapper-locations: classpath:com/lazycece/sbac/mysql/data/dao/*/mapper/*.xml
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这里给出一个mybatis的简单配置,有关更多的配置属性,可以参考mybatis的XML配置。
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<? 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 >
<!-- 使用jdbc的getGeneratedKEYS 获取数据库自增主键 -->
< setting name = "useGeneratedKeys" value = "true" />
<!-- 开启驼峰命名转换 -->
< setting name = "mapUnderscoreToCamelCase" value = "true" />
<!--日志输出sql语句-->
< setting name = "logImpl" value = "STDOUT_LOGGING" />
</ settings >
< typeAliases >
< package name = "com.lazycece.sbac.mysql.data.domain" />
</ typeAliases >
< typeHandlers >
< typeHandler handler = "org.apache.ibatis.type.EnumOrdinalTypeHandler"
javaType = "com.lazycece.sbac.mysql.data.domain.Status" />
</ typeHandlers >
</ configuration >
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案例实现
这里给出一个简单的案例(用户信息的插入和查询)来展现mapper层的实现,实体就不在这里展示了。mapper接口如下:
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@Mapper
public interface UserDao {
void insert(User user);
User findByUsername( @Param ( "username" ) String username);
}
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同时需要在主函数上加入注解@MapperScan来扫描我们mapper:
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@SpringBootApplication
@MapperScan (basePackages = { "com.lazycece.sbac.mysql.data.dao" })
public class SpringbootAcMysqlSimpleApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootAcMysqlSimpleApplication. class , args);
}
}
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mapper的sql实现,这里选择用xml的方式实现,当然也可以选择用注解方式(这里对应的@Select,@Insert):
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<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
< mapper namespace = "com.lazycece.sbac.mysql.data.dao.master.UserDao" >
< sql id = "allColumn" >
id,create_time,update_time,username,password,telephone,status,editor
</ sql >
< insert id = "insert" parameterType = "User" useGeneratedKeys = "true" keyProperty = "id" >
INSERT INTO
user (create_time,update_time,username,password,telephone,status,editor)
VALUE (#{createTime},#{updateTime},#{username},#{password},#{telephone},#{status},#{editor});
</ insert >
< select id = "findByUsername" resultType = "User" >
SELECT
< include refid = "allColumn" />
FROM user
WHERE username = #{username};
</ select >
</ mapper >
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细心者可发现,前面配置引入中引入mapper是写的classpath:com/lazycece/sbac/mysql/data/dao//mapper/.xml包名路径,使用这种方式默认情况下是不会成功的,因为包路径下文件默认只会编译java文件,所以需要在pom文件中加入配置使得在工程编译时将其包含进编译后的路径下。
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< build >
< resources >
< resource >
< directory >src/main/java</ directory >
< includes >
< include >com/lazycece/sbac/mysql/data/dao/*/mapper/*.xml</ include >
</ includes >
</ resource >
</ resources >
</ build >
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案例源码
案例源码地址: https://github.com/lazycece/springboot-actual-combat/tree/master/springboot-ac-mysql/springboot-ac-mysql-simple
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原文链接:https://blog.csdn.net/qq_28851503/article/details/89812530