MyBatis实现SaveOrUpdate

/MyBatis实现SaveOrUpdate已关闭评论

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<insert id="saveOrUpdate" >
  <selectKey keyProperty="count" resultType="int" order="BEFORE">
    select count(*) from country where id = #{id}
  </selectKey>
  <if test="count > 0">
    update country
    set countryname = #{countryname},countrycode = #{countrycode}
    where id = #{id}
  </if>
  <if test="count==0">
    insert into country values(#{id},#{countryname},#{countrycode})
  </if>
</insert>

注意如果insert的parameterTy […]

MyBatis之三：多表联合查询

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在这篇文章里面主要讲解如何在mybatis里面使用一对一、一对多、多表联合查询（类似视图）操作的例子。 注：阅 […]

Consider renaming one of the beans or enabling overriding by setting

/Consider renaming one of the beans or enabling overriding by setting已关闭评论

1. 报错信息

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Description:
 
The bean 'dataSource', defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class] and overriding is disabled.
 
Action:
 
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true
 

2. 原因 [crayon- […]

SSO

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SSO英文全称Single Sign On，单点登录。SSO是在多个应用系统中，用户只需要登录一次就可以访问所 […]

WEBFLUX是什么东东

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转自：百家号-薇薇心语 各位Javaer们，大家都在用SpringMVC吧？当我们不亦乐乎的用着SpringM […]

ElasticSearch使用

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ElasticSearch是一个基于Lucene的搜索服务器。它提供了一个分布式多用户能力的全文搜索引擎，基于 […]