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.增强SELECT分页查询; 3.链式Query查询条件构造器；支持Lambda 形式调用，方便编写各类查询条件
4.@Encrypted注解轻松实现字段数据加密和解密;
5.字段数据自动填充功能;
6.数据库支持
| 数据库 | 支持 |
| --- | --- |
| MySQL | ✅ |
| PostgreSQL | ✅ |
| Oracle | ✅ |
| SqlServer | ✅ |
| DB2 | ✅ |
1、JPA 3注释
1.1、注释
* @Entity
* @Table
* @Column
* @ColumnDefault
* @Id
* @GeneratedValue
* @Encrypted
* @Transient
* @Temporal
* @PartitionKey
* @SoftDelete
1.2、主键策略
支持3种主键策略
| 序号 | 策略 | 支持 |
| --------| :----- | :---- |
| 1 | AUTO | 主键自动填充策略 <br>snowflakeid (雪花 ID - 默认)<br>uuid (UUID) |
| 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
@Encrypted
private String password;
@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;
@SoftDelete
@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 delete() throws Exception{
service.delete("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);
}
2.2、逻辑删除
//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);
}
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(1);
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(1,20);
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.setPageNumber(1);
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.setPageNumber(1);
JpaPageResults<Students> results = service.fetchPageResults("fetchPageResults1",student);
}
2.6、 Lambda查询
//根据Lambda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' ) )
service.query(
new LambdaQuery<Students>().eq(Students::getStdMajor, "政治")
.and().gt(Students::getStdAge, Integer.valueOf(30))
.and().in(Students::getStdMajor, new Object[]{"政治","化学"})
.or(
new LambdaQuery<Students>().eq(Students::getStdName, "周瑜")
.or().eq(Students::getStdName, "吕蒙")
)
);
//根据Lambda链式条件构造器分页查询
//where stdMajor = '政治' and stdAge > 30
JpaPage page = new JpaPage();
page.setPageSize(20);
page.setPageable(true);
LambdaQuery<Students> lambdaQuery =new LambdaQuery<>();
lambdaQuery.eq(Students::getStdMajor, "政治").and().gt(Students::getStdAge, Integer.valueOf(30));
JpaPageResults<Students> results = service.fetch(page,lambdaQuery);
...
2.7、FindBy查询
实现spring data jpa的findBy功能
//Mapper接口定义
//where x.stdNo = ?1
@Select({})
public List<Students> findByStdNo(String stdNo);
//where x.stdNo = ?1
@Select({})
public List<Students> findByStdNoIs(String stdNo);
//where x.stdNo = ?1
@Select({})
public List<Students> findByStdNoEquals(String stdNo);
//where x.stdAge between ?1 and ?2
@Select({})
public List<Students> findByStdAgeBetween(int ageStart,int ageEnd);
//where x.stdAge < ?1
@Select({})
public List<Students> findByStdAgeLessThan(int ageLessThan);
//where x.stdAge <= ?1
@Select({})
public List<Students> findByStdAgeLessThanEqual(int ageLessThanEqual);
//where x.stdAge > ?1
@Select({})
public List<Students> findByStdAgeAfter(int ageAfter);
//where x.stdAge < ?1
@Select({})
public List<Students> findByStdAgeBefore(int ageBefore);
//where x.images is null
@Select({})
public List<Students> findByImagesNull();
//where x.images is null
@Select({})
public List<Students> findByImagesIsNull();
//where x.images is not null
@Select({})
public List<Students> findByImagesIsNotNull();
//where x.images is not null
@Select({})
public List<Students> findByImagesNotNull();
//where x.stdName like ?1
@Select({})
public List<Students> findByStdNameLike(String stdName);
//where x.stdName not like ?1
@Select({})
public List<Students> findByStdNameNotLike(String stdName);
//where x.stdName like ?1 (parameter bound with appended %)
@Select({})
public List<Students> findByStdNameStartingWith(String stdName);
//where x.stdName like ?1 (parameter bound with prepended %)
@Select({})
public List<Students> findByStdNameEndingWith(String stdName);
//where x.stdName like ?1 (parameter bound wrapped in %)
@Select({})
public List<Students> findByStdNameContaining(String stdName);
//where x.stdGender = ?1 order by x.stdAge desc
@Select({})
public List<Students> findByStdGenderOrderByStdAge(String stdGender);
//where x.stdGender = ?1 order by x.stdAge desc
@Select({})
public List<Students> findByStdGenderIsOrderByStdAge(String stdGender);
//where x.stdMajors in ?1
@Select({})
public List<Students> findByStdMajorIn(String... stdMajors) ;
//where x.stdMajors not in ?1
@Select({})
public List<Students> findByStdMajorNotIn(List<String> stdMajors);
//where x.deleted = true
@Select({})
public List<Students> findByDeletedTrue();
//where x.deleted = false
@Select({})
public List<Students> findByDeletedFalse();
//where UPPER(x.stdGender) = UPPER(?1)
@Select({})
public List<Students> findByStdGenderIgnoreCase(String stdGender);
//where x.stdNo <> ?1
@Select({})
public List<Students> findByStdNoNot(String stdNo);
//where x.lastname = ?1 and x.firstname = ?2
@Select({})
public List<Students> findByStdMajorAndStdClass(String stdMajor,String stdClass);
2.8、默认数据自动填充
继承FieldAutoFillHandler，实现insertFill和updateFill函数，可以完成租户字段，创建人、创建时间、修改人、修改时间等默认字段的填充
import org.apache.ibatis.reflection.MetaObject;
import org.dromara.mybatis.jpa.handler.FieldAutoFillHandler;
public class MxkFieldAutoFillHandler extends FieldAutoFillHandler{
@Override
public void insertFill(MetaObject metaObject) {
this.setFieldValue(metaObject , "stdNo", "AutoFill_Insert");
}
@Override
public void updateFill(MetaObject metaObject) {
this.setFieldValue(metaObject , "stdNo", "AutoFill_Update");
}
}
3、版本更新
1、新增注解 @SoftDelete(新逻辑删除) @Encrypted
2、@Encrypted注解轻松实现字段数据加密和解密;
3、字段数据自动填充功能;继承FieldAutoFillHandler，实现insertFill和updateFill函数，可以完成租户字段，创建人、创建时间、修改人、修改时间等默认字段的填充
4、支持Lambda 形式调用，方便编写各类查询条件
5、实现spring data jpa的findBy功能
6、代码调整和优化
