Springboot mybatisplus redis 如何实现二级缓存

二级缓存的实现需要在Mybatis的配置文件中配置，具体步骤如下：

1.在SpringBoot的配置文件中，配置Mybatis的mapperLocations，typeAliasesPackage等属性。

2.在Mybatis的配置文件中，添加以下配置：

<settings>
    <setting name="cacheEnabled" value="true"/>
    <setting name="lazyLoadingEnabled" value="true"/>
    <setting name="aggressiveLazyLoading" value="false"/>
    <setting name="defaultExecutorType" value="REUSE"/>
    <setting name="mapUnderscoreToCamelCase" value="true"/>
    <setting name="logImpl" value="LOG4J"/>
    <setting name="localCacheScope" value="SESSION"/>
    <setting name="jdbcTypeForNull" value="NULL"/>
    <setting name="defaultStatementTimeout" value="2500"/>
    <setting name="defaultFetchSize" value="1000"/>
    <setting name="safeRowBoundsEnabled" value="false"/>
    <setting name="callSettersOnNulls" value="false"/>
    <setting name="useColumnLabel" value="true"/>
    <setting name="returnInstanceForEmptyRow" value="false"/>
    <setting name="useGeneratedKeys" value="false"/>
    <setting name="autoMappingBehavior" value="PARTIAL"/>
    <setting name="autoMappingUnknownColumnBehavior" value="NONE"/>
    <setting name="cacheRefNamespace" value=""/>
    <setting name="defaultScriptingLanguage" value="XML"/>
    <setting name="defaultEnumTypeHandler" value="org.apache.ibatis.type.EnumOrdinalTypeHandler"/>
    <setting name="defaultNumericTypeHandler" value="org.apache.ibatis.type.BigDecimalTypeHandler"/>
    <setting name="defaultBooleanTypeHandler" value="org.apache.ibatis.type.BooleanTypeHandler"/>
    <setting name="defaultTypeHandler" value="org.apache.ibatis.type.ObjectTypeHandler"/>
    <setting name="lazyLoadTriggerMethods" value="equals,clone,hashCode,toString"/>
    <setting name="defaultSqlProviderType" value="org.apache.ibatis.extensions.ibatisprovider.CustomSqlProvider"/>
    <setting name="excludeStatementTypes" value=""/>
    <setting name="mapEmptyStringsToNulls" value="false"/>
    <setting name="callAnyGetterOnMap" value="false"/>
    <setting name="returnInstanceForEmptyCollection" value="false"/>
    <setting name="multipleResultSetsEnabled" value="true"/>
    <setting name="useActualParamName" value="true"/>
    <setting name="logPrefix" value=""/>
    <setting name="configurationFactory" value=""/>
    <setting name="vfsImpl" value=""/>
    <setting name="usePrefixesInMapper" value="false"/>
    <setting name="useGeneratedKeysWithJdbc4GeneratedKeys" value="false"/>
    <setting name="sqlSessionFactoryBuilder" value=""/>
    <setting name="autoDelimitKeywords" value="false"/>
    <setting name="databaseIdProvider" value=""/>
    <setting name="defaultSqlProviderAnnotation" value=""/>
    <setting name="localCacheHashcode" value="false"/>
    <setting name="mailSession" value=""/>
    <setting name="useClassNameAsMapKey" value="true"/>
    <setting name="globalPropertiesRef" value=""/>
    <setting name="sqlResultSetHandlerFactory" value=""/>
    <setting name="databaseSchema" value=""/>
    <setting name="configurationProperties" value=""/>
  </settings>
  <typeAliases>
    <typeAlias alias="Student" type="com.csdn.entity.Student"/>
  </typeAliases>
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="${mysql.driver}"/>
        <property name="url" value="${mysql.url}"/>
        <property name="username" value="${mysql.username}"/>
        <property name="password" value="${mysql.password}"/>
      </dataSource>
    </environment>
  </environments>
  <mappers>
    <mapper resource="com/csdn/mapper/StudentMapper.xml"/>
  </mappers>

其中，设置cacheEnabled为true，开启缓存；设置localCacheScope为SESSION，开启二级缓存。

3.在mapper的.xml文件中，添加以下配置：

<select id="getStudent" resultMap="StudentResultMap" useCache="true" statementType="STATEMENT">
    select * from student where id = #{id}
</select>

其中，useCache为true，开启缓存。

4.在需要使用二级缓存的实体类中，添加以下注解：

@CacheNamespace(eviction = FifoCache.class, flushInterval = 60000, size = 512, readWrite = true)

其中，eviction表示策略，flushInterval表示刷新时间，size表示缓存最大值，readWrite表示是否支持读写。

以上就是SpringBoot+MybatisPlus+Redis实现二级缓存的步骤。希望能对你有所帮助。