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- […]

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 […]

jar中没有主清单属性【解决办法】

/jar中没有主清单属性【解决办法】已关闭评论

在pom文件中，添加如下即可：

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<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <source>1.8</source>
        <target>1.8</target>
    </configuration>
</plugin>
<plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
    <executions>
        <execution>
            <goals>
                <goal>repackage</goal>
            </goals>
        </execution>
    </executions>
</plugin>

  […]