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MyBatis JPA Extra 3.2 发布

日期：2023-08-08点击：221收藏

MyBatis JPA Extra

MyBatis JPA Extra对MyBatis扩展JPA功能

1.Jakarta JPA 3注释简化CUID操作;

2.Interceptor实现数据库SELECT分页查询;

3.链式Query查询条件构造器;

4.提供starter,简化SpringBoot集成;

1、JPA 3注释

1.1、注释

@Entity

@Table

@Column

@Id

@GeneratedValue

@Transient

@Temporal

@PartitionKey

@ColumnDefault

@ColumnLogic

1.2、主键策略

支持3种主键策略

序号	策略	支持
1	AUTO	4种主键自动填充策略 snowflakeid(雪花ID-默认) uuid(UUID) uuid.hex(UUID十六进制) serial(JPA Extra序列)
2	SEQUENCE	数据库序列生成，generator值为数据库序列名
3	IDENTITY	数据库表自增主键

1.3、Java Bean 注释

 @Entity @Table(name = "STUDENTS")  public class Students extends JpaEntity implements Serializable{  @Id  @Column  @GeneratedValue  private String id;  @Column  private String stdNo;  @Column  private String stdName;  @Column  @ColumnDefault("'M'")  private String stdGender;  @Column  private int stdAge;  @Column  private String stdMajor;  @Column  private String stdClass;  @Column  private byte[] images;  @Column(insertable = false)  @GeneratedValue  @Temporal(TemporalType.TIMESTAMP)  private LocalDateTime modifyDate;  @ColumnLogic  @Column(name ="is_deleted")  private int isDeleted;  //getter setter }

2、基本操作

2.1、CURD

  //新增数据  @Test  void insert() throws Exception{  Students student = new Students();  student.setStdNo("10024");  student.setStdGender("M");  student.setStdName("司马昭");  student.setStdAge(20);  student.setStdMajor("政治");  student.setStdClass("4");  service.insert(student);  }  //查询数据实体并更新  @Test  void update() throws Exception{  Students student = service.get("317d5eda-927c-4871-a916-472a8062df23");  student.setStdMajor("政治");  service.update(student);  }  //根据实体查询并更新  @Test  void merge() throws Exception{  Students student = new Students();  student.setStdMajor("政治");  student.setStdClass("4");  service.merge(student);  }  //根据ID查询  @Test  void get() throws Exception{  Students student = service.get("317d5eda-927c-4871-a916-472a8062df23");  }  //根据实体查询  @Test  void query() throws Exception{  Students student = new Students();  student.setStdGender("M");  List<Students> listStudents = service.query(student);  }  //查询所有记录  @Test  void findAll() throws Exception{  List<Students> listStudents = service.findAll();  }  //根据ID删除  @Test  void remove() throws Exception{  service.remove("921d3377-937a-4578-b1e2-92fb23b5e512");  }  //根据ID集合批量删除  @Test  void batchDelete() throws Exception{  List<String> idList = new ArrayList<String>();  idList.add("8584804d-b5ac-45d2-9f91-4dd8e7a090a7");  idList.add("ab7422e9-a91a-4840-9e59-9d911257c918");  //...  service.deleteBatch(idList);  }  //根据ID批量删除  @Test  void batchDeleteByIds() throws Exception{  service.deleteBatch("2");  service.deleteBatch("2,639178432667713536");  }

2.2、逻辑删除

  //根据ID删除或者ID字符串分隔符,批量逻辑删除  @Test  void logicDelete() throws Exception{  service.logicDelete("2");  service.logicDelete("2,639178432667713536");  }  //根据IDS批量逻辑删除  @Test  void logicBatchDelete() throws Exception{  List<String> idList=new ArrayList<String>();  idList.add("8584804d-b5ac-45d2-9f91-4dd8e7a090a7");  idList.add("ab7422e9-a91a-4840-9e59-9d911257c918");  //...  service.logicDelete(idList);  }  //根据IDS字符串和分割符批量逻辑删除  @Test  void logicDeleteSplit() throws Exception{  service.logicDeleteSplit("2,639178432667713536",",");  }

2.3、Find查询和Qruey构造器

  //SpringJDBC的查询方式 where StdNo = '10024' or StdNo = '10004'  @Test  void find() throws Exception{  List<Students> listStudents = service.find(" StdNo = ? or StdNo = ? ",  new Object[]{"10024","10004"},  new int[]{Types.VARCHAR,Types.INTEGER}  );  }  //根据链式条件构造器查询  //WHERE (stdMajor = '政治' and STDAGE > 30 and stdMajor in ( '政治' , '化学' ) or ( stdname = '周瑜' or stdname = '吕蒙' ) )  @Test  void queryByCondition() throws Exception{  List<Students> listStudents = service.query(  new Query().eq("stdMajor", "政治").and().gt("STDAGE", 30).and().in("stdMajor", new Object[]{"政治","化学"})  .or(new Query().eq("stdname", "周瑜").or().eq("stdname", "吕蒙")));  }

2.4、单表分页查询

  //根据实体分页查询  @Test  void fetch() throws Exception{  JpaPage page = new JpaPage();  page.setPageSize(20);  page.setPageable(true);  Students student = new Students();  student.setStdGender("M");  JpaPageResults<Students> results = service.fetch(page,student);  }  //根据Query条件分页查询 where stdMajor = '政治' and STDAGE > 30  @Test  void fetchByCondition() throws Exception{  JpaPage page = new JpaPage();  page.setPageSize(20);  page.setPageable(true);  Query condition = new Query().eq("stdMajor", "政治").and().gt("STDAGE", 30);  JpaPageResults<Students> results = service.fetch(page,condition);  }

2.5、根据mapper的xml分页查询

  //根据Mapper xml配置fetchPageResults分页查询  @Test  void fetchPageResults() throws Exception{  Students student=new Students();  student.setStdGender("M");  student.setPageSize(10);  student.calculate(21);  JpaPageResults<Students> results = service.fetchPageResults(student);  }  //根据Mapper xml id分页查询,fetchPageResults1在mapper的xml中配置  @Test  void fetchPageResultsByMapperId() throws Exception{  Students student=new Students();  student.setStdGender("M");  student.setPageSize(10);  student.setPageNumber(2);  JpaPageResults<Students> results = service.fetchPageResults("fetchPageResults1",student);  }

3、mapper配置

 <mapper namespace="org.apache.mybatis.jpa.test.dao.persistence.StudentsMapper" >  <sql id="sql_condition">  WHERE 1 = 1  <if test="id != null">  AND ID = '${id}'  </if>  <if test="stdName != null and stdName != '' ">  AND STDNAME like '%${stdName}%'  </if>  <if test="stdGender != null and stdGender != '' ">  AND STDGENDER = #{stdGender}  </if>  <if test="stdMajor != null">  <![CDATA[AND STDMAJOR = #{stdMajor}]]>  </if>  </sql>    <select id="fetchPageResults" parameterType="Students" resultType="Students">  SELECT   ID ,  STDNO ,  STDNAME ,  STDGENDER ,  STDAGE ,  STDMAJOR ,  STDCLASS   FROM STUDENTS   <include refid="sql_condition"/>  </select>    <select id="fetchPageResults1" parameterType="Students" resultType="Students">  SELECT   ID ,  STDNO ,  STDNAME ,  STDGENDER ,  STDAGE ,  STDMAJOR ,  STDCLASS   FROM STUDENTS   <include refid="sql_condition"/>  </select>    <select id="queryBy" parameterType="Students" resultType="Students">  SELECT   ID ,  STDNO ,  STDNAME ,  STDGENDER ,  STDAGE ,  STDMAJOR ,  STDCLASS   FROM ROLES   <include refid="sql_condition"/>  </select>    <delete id="delete" parameterType="Students" >  DELETE FROM STUDENTS WHERE ID=#{id}  </delete>