fix(jpa) 单一实体操作实例

starter-data/starter-data-jpa/pom.xml

@@ -15,7 +15,7 @@
     <properties>
         <org.mapstruct.version>1.5.3.Final</org.mapstruct.version>
         <lombok.version>1.18.20</lombok.version>
-<!--        <querydsl.version>4.4.0</querydsl.version>-->
+        <!--        <querydsl.version>4.4.0</querydsl.version>-->
     </properties>
 
     <dependencies>
@@ -45,11 +45,11 @@
             <artifactId>postgresql</artifactId>
             <version>42.3.4</version>
         </dependency>
-        <!--<dependency>
+        <dependency>
             <groupId>com.h2database</groupId>
             <artifactId>h2</artifactId>
-            <scope>runtime</scope>
-        </dependency>-->
+            <scope>test</scope>
+        </dependency>
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>druid</artifactId>

starter-data/starter-data-jpa/src/main/java/com/zja/dao/example/ExampleUserRepo.java

@@ -6,9 +6,12 @@
 import org.springframework.data.domain.Sort;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
+import org.springframework.data.jpa.repository.Modifying;
 import org.springframework.data.jpa.repository.Query;
 import org.springframework.data.repository.CrudRepository;
+import org.springframework.data.repository.query.Param;
 import org.springframework.stereotype.Repository;
+import org.springframework.transaction.annotation.Transactional;
 
 import java.util.List;
 import java.util.Optional;
@@ -23,38 +26,105 @@ public interface ExampleUserRepo extends
         CrudRepository<ExampleUser, String>,
         JpaSpecificationExecutor<ExampleUser> {
 
+    //==================查询==================
+
+    // 简单查询
     Optional<ExampleUser> findByLoginName(String loginName);
+    // ExampleUser findByLoginName(String loginName);
+
+    // 按loginName查询name值
+    @Query("SELECT u.name FROM ExampleUser u WHERE u.loginName = ?1")
+    Optional<String> findNameByLoginName(String loginName);
+    // String findNameByLoginName(String loginName);
 
-    List<ExampleUser> findByIdIn(List<String> ids);
+    // 批量查询
+    List<ExampleUser> findByLoginNameIn(List<String> loginNames);
 
-    //统计查询
+    // 模糊查询，支持：%name%、%name、name%
+    List<ExampleUser> findByNameLike(String name);
+
+    // 统计查询
     long countByName(String name);
 
-    //删除查询
-    long deleteByName(String name);
+    //==================查询-end==================
 
-    List<ExampleUser> removeByName(String name);
 
-    //实体类名称
-    @Query("select u from #{#entityName} u where u.name = ?1")
-//    @Query("select u from ExampleUser u where u.name = ?1")
-    List<ExampleUser> findByName(String name);
+    //==================分页查询+排序==================
+
+    // 分页查询
+    Page<ExampleUser> findByName(String name, Pageable pageable);
+    // List<ExampleUser> findByName(String name, Pageable pageable);
 
-    //分页查询
-    Page<ExampleUser> findByName(String lastname, Pageable pageable);
+    // 分页模糊查询，支持：%name%、%name、name%
+    Page<ExampleUser> findByNameLike(String name, Pageable pageable);
 
-    //分页模糊查询
-    Page<ExampleUser> findByNameLike(String lastname, Pageable pageable);
+    // 按name模糊分页查询，并按age和createTime排序
+    Page<ExampleUser> findByNameContainingIgnoreCaseOrderByAgeAscCreateTimeDesc(String name, Pageable pageable);
 
+    // 排序查询
     List<ExampleUser> findByName(String name, Sort sort);
-    //List<ExampleUser> findByName(String lastname, Pageable pageable);
 
-/*    //使用 SpEL 表达式 - 通配符快捷方式
-    @Query("select u from ExampleUser u where u.name like %:#{[0]}% and u.name like %:lastname%")
-    List<ExampleUser> findByNameWithSpelExpression(@Param("name") String name);
+    //==================分页查询-end==================
+
+
+    //==================SpEL 表达式 通配符 ==================
+
+    // 按关键词name模糊分页查询，并按age和createTime排序，采用SpEL 表达式 通配符
+    @Query("SELECT u FROM ExampleUser u WHERE u.name LIKE %:keyword% ORDER BY u.age ASC, u.createTime DESC")
+    Page<ExampleUser> findByKeywordOrderByAgeAscCreateTimeDesc(@Param("keyword") String keyword, Pageable pageable);
+
+    // 按实体类名称和name字段模糊分页查询，并按age和createTime排序，采用SpEL 表达式 通配符
+    // 注：entityName=ExampleUser
+    @Query("SELECT u FROM #{#entityName} u WHERE u.name LIKE %:keyword% ORDER BY u.age ASC, u.createTime DESC")
+    Page<ExampleUser> findByEntityAndNameLikeOrderByAgeAscCreateTimeDesc(@Param("entityName") String entityName, @Param("keyword") String keyword, Pageable pageable);
+
+    // 实体类名称
+    @Query("select u from #{#entityName} u where u.name = :name")
+    // @Query("select u from ExampleUser u where u.name = ?1")
+    List<ExampleUser> querySpELByName(String entityName, String name);
+
+    //==================SpEL 表达式 通配符-end ==================
+
+
+    //==================更新==================
 
-    //修改查询
+    // 按loginName更新name值
+    @Transactional
     @Modifying
-    @Query("update ExampleUser u set u.firstname = ?1 where u.name = ?2")
-    int setFixedFirstnameFor(String firstname, String name);*/
+    @Query("UPDATE ExampleUser u SET u.name = :newName WHERE u.loginName = :loginName")
+    void updateNameByLoginName(String newName, String loginName);
+    // @Query("update ExampleUser u set u.name = ?1 where u.loginName = ?2")
+    // int updateNameByLoginName(String name, String loginName);
+
+    // 按loginName更新name值，采用nativeQuery=true写法
+    // @Modifying
+    // @Query(value = "UPDATE example_user SET name = :newName WHERE login_name = :loginName", nativeQuery = true)
+    // void updateNameByLoginName(String newName, String loginName);
+
+    //==================更新-end==================
+
+    //==================删除==================
+
+    // 按 loginName 删除相关记录
+    void deleteByLoginName(String loginName);
+
+    // 按loginName删除name值
+    @Transactional
+    @Modifying
+    @Query("UPDATE ExampleUser u SET u.name = NULL WHERE u.loginName = :loginName")
+    void deleteNameByLoginName(String loginName);
+
+    // 按loginName删除name值，采用nativeQuery=true写法
+    // @Modifying
+    // @Query(value = "UPDATE example_user SET name = NULL WHERE login_name = :loginName", nativeQuery = true)
+    // void deleteNameByLoginName(String loginName);
+
+    // 按name删除，并返回删除的相关记录个数
+    long deleteByName(String name);
+
+    // 按name删除，并放回删除的相关记录
+    List<ExampleUser> removeByName(String name);
+
+    //==================删除-end==================
+
 }

starter-data/starter-data-jpa/src/main/java/com/zja/entitys/example/ExampleUser.java

@@ -25,7 +25,7 @@ public class ExampleUser extends BaseEntity {
     /**
      * 用户名
      */
-    @Column(name = "user_name", nullable = false)
+    @Column(name = "user_name")
     private String name;
 
     /**
@@ -34,6 +34,11 @@ public class ExampleUser extends BaseEntity {
     @Column(name = "LOGIN_NAME", nullable = false)
     private String loginName;
 
+    /**
+     * 住址
+     */
+    private String address;
+
     /**
      * 年龄
      */