1.springboot整合mybatis mapper注入时显示could not autowire,如果强行写(value = false ),可能会报nullpointexception异常
解决方案:
dao层加注解@component(value = "首字母小写的接口名如usermapper->usermapper")
dao层还可以加注解@mapper
2.the server time zone value 'öð¹ú±ê׼걼ä' is unrecognized or represents more than one time zone问题
3.java.lang.illegalargumentexception: defaultserializer requires a serializable payload but received an object of type[xxx]
解决:实体对象类没有序列化,需要implements serializable
ps:下面看下springboot整合mybatis出现的一些问题
springboot整合mybatis非常非常的简单,简直简单到发指。但是也有一些坑,这里我会详细的指出会遇到什么问题,并且这些配置的作用
整合mybatis,无疑需要mapper文件,实体类,dao层,数据库连接池。。。。。也就没了。
先放配置application.yml
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spring: datasource: type: com.alibaba.druid.pool.druiddatasource driver- class -name: com.mysql.jdbc.driver filters: stat maxactive: 20 initialsize: 1 maxwait: 60000 minidle: 1 timebetweenevictionrunsmillis: 60000 minevictableidletimemillis: 300000 validationquery: select 'x' testwhileidle: true testonborrow: false testonreturn: false poolpreparedstatements: true maxopenpreparedstatements: 20 name: test url: jdbc:mysql: //localhost:3306/mama-bike?useunicode=true&characterencoding=utf-8&zerodatetimebehavior=converttonull username: root password: root mybatis: #告诉spring你的mapper的位置。 mapper-locations: classpath:com/coder520/mamabike /**/ **.xml #告诉spring你的实体类的位置 type-aliases- package : classpath:com.coder520.mamabike.**.entity logging: config: classpath:logback.xml |
dao层接口 //就简单的写一个方法
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public interface usermapper { int insert(user record); } |
mapper
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<?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.coder520.mamabike.user.dao.usermapper" > <resultmap id= "baseresultmap" type= "com.coder520.mamabike.user.entity.user" > <id column= "id" property= "id" jdbctype= "bigint" /> <result column= "nickname" property= "nickname" jdbctype= "varchar" /> <result column= "enable_flag" property= "enableflag" jdbctype= "tinyint" /> <result column= "verify_flag" property= "verifyflag" jdbctype= "tinyint" /> <result column= "head_img" property= "headimg" jdbctype= "varchar" /> <result column= "mobile" property= "mobile" jdbctype= "varchar" /> </resultmap> <sql id= "base_column_list" > id, nickname, enable_flag, verify_flag, head_img, mobile </sql> <insert id= "insert" parametertype= "com.coder520.mamabike.user.entity.user" > insert into user (id, nickname, enable_flag, verify_flag, head_img, mobile ) values (#{id,jdbctype=bigint}, #{nickname,jdbctype=varchar}, #{enableflag,jdbctype=tinyint}, #{verifyflag,jdbctype=tinyint}, #{headimg,jdbctype=varchar}, #{mobile,jdbctype=varchar} ) </insert> </mapper> |
main方法
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@springbootapplication @componentscan (basepackages={ "com.coder520.mamabike" }) @mapperscan (basepackages= "com.demo.user.mapper" ) public class mamabikeapplication { public static void main(string[] args) { springapplication.run(mamabikeapplication. class , args); } } |
需要注意的是,dao层接口spring怎么会知道呢?这里就需要@mapperscan(basepackages="com.demo.user.mapper")
这个注解来指定mapper接口的位置。用@componentscan(basepackages={"com.coder520.mamabike"})
这个注解来让spring扫描我们指定包下的注解。
如果我们不用@mapperscan这个注解的话,也可以在接口类的上方加上@mapper这个注解也可以。
总结
以上所述是小编给大家介绍的springboot整合mybatis中的问题及出现的一些问题小结,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:https://blog.csdn.net/qq_41602595/article/details/84316153