添加查询书籍；BookDO映射文件更新；DOMapper添加@Repository注解；添加自定义业务异常处理；添加Validation验证

bookshelfplus/pom.xml

@@ -83,7 +83,7 @@
         <dependency>
             <groupId>org.hibernate</groupId>
             <artifactId>hibernate-validator</artifactId>
-            <version>7.0.3.Final</version>
+            <version>6.2.3.Final</version>
         </dependency>
 
         <!--日期时间-->
@@ -307,6 +307,16 @@
                 <artifactId>spring-boot-maven-plugin</artifactId>
                 <version>2.4.3</version>
             </plugin> -->
+
+            <!-- 拉姆达表达式需要支持 Java 8 语法 -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
         </plugins>
     </build>
 </project>