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 |
✅ |
代码托管
| GitCode | Gitee |GitHub |
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 snowflakeid(雪花ID-默认) 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 listStudents = service.query(student);
}
//查询所有记录
@Test
void findAll() throws Exception{
List 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 idList = new ArrayList();
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 softDelete() throws Exception{
List idList=new ArrayList();
idList.add("8584804d-b5ac-45d2-9f91-4dd8e7a090a7");
idList.add("ab7422e9-a91a-4840-9e59-9d911257c918");
//...
service.softDelete(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 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 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 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 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 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 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().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().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 lambdaQuery =new LambdaQuery<>();
lambdaQuery.eq(Students::getStdMajor, "政治").and().gt(Students::getStdAge, Integer.valueOf(30));
JpaPageResults results = service.fetch(page,lambdaQuery);
...
2.6、 UpdateWrapper更新
//根据UpdateWrapper更新数据
UpdateWrapper updateWrapper = new UpdateWrapper();
updateWrapper.set("StdMajor", "历史").eq("StdName", "周瑜").or().eq("StdName", "吕蒙");
service.update(updateWrapper);
//更新LambdaUpdateWrapper更新数据，带多重LambdaUpdateWrapper
List majorList = new ArrayList<>(Arrays.asList("政治","化学"));
LambdaUpdateWrapper updateWrapper = new LambdaUpdateWrapper<>();
updateWrapper.set(Students::getStdMajor, "历史")
.eq(Students::getStdMajor, "政治")
.and().gt(Students::getStdAge, Integer.valueOf(30))
.and().in(Students::getStdMajor, majorList)
.or(new LambdaUpdateWrapper().eq(Students::getStdName, "周瑜").or().eq(Students::getStdName, "吕蒙"));
service.update(updateWrapper);
2.8、FindBy查询
实现spring data jpa的findBy功能
//Mapper接口定义
//where x.stdNo = ?1
@Select({})
public List findByStdNo(String stdNo);
//where x.stdNo = ?1
@Select({})
public List findByStdNoIs(String stdNo);
//where x.stdNo = ?1
@Select({})
public List findByStdNoEquals(String stdNo);
//where x.stdAge between ?1 and ?2
@Select({})
public List findByStdAgeBetween(int ageStart,int ageEnd);
//where x.stdAge < ?1
@Select({})
public List findByStdAgeLessThan(int ageLessThan);
//where x.stdAge <= ?1
@Select({})
public List findByStdAgeLessThanEqual(int ageLessThanEqual);
//where x.stdAge > ?1
@Select({})
public List findByStdAgeAfter(int ageAfter);
//where x.stdAge < ?1
@Select({})
public List findByStdAgeBefore(int ageBefore);
//where x.images is null
@Select({})
public List findByImagesNull();
//where x.images is null
@Select({})
public List findByImagesIsNull();
//where x.images is not null
@Select({})
public List findByImagesIsNotNull();
//where x.images is not null
@Select({})
public List findByImagesNotNull();
//where x.stdName like ?1
@Select({})
public List findByStdNameLike(String stdName);
//where x.stdName not like ?1
@Select({})
public List findByStdNameNotLike(String stdName);
//where x.stdName like ?1 (parameter bound with appended %)
@Select({})
public List findByStdNameStartingWith(String stdName);
//where x.stdName like ?1 (parameter bound with prepended %)
@Select({})
public List findByStdNameEndingWith(String stdName);
//where x.stdName like ?1 (parameter bound wrapped in %)
@Select({})
public List findByStdNameContaining(String stdName);
//where x.stdGender = ?1 order by x.stdAge desc
@Select({})
public List findByStdGenderOrderByStdAge(String stdGender);
//where x.stdGender = ?1 order by x.stdAge desc
@Select({})
public List findByStdGenderIsOrderByStdAge(String stdGender);
//where x.stdMajors in ?1
@Select({})
public List findByStdMajorIn(String... stdMajors) ;
//where x.stdMajors not in ?1
@Select({})
public List findByStdMajorNotIn(List stdMajors);
//where x.deleted = true
@Select({})
public List findByDeletedTrue();
//where x.deleted = false
@Select({})
public List findByDeletedFalse();
//where UPPER(x.stdGender) = UPPER(?1)
@Select({})
public List findByStdGenderIgnoreCase(String stdGender);
//where x.stdNo <> ?1
@Select({})
public List findByStdNoNot(String stdNo);
//where x.lastname = ?1 and x.firstname = ?2
@Select({})
public List findByStdMajorAndStdClass(String stdMajor,String stdClass);
2.9、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、mapper配置
WHERE 1 = 1
AND ID = '${id}'
AND STDNAME like '%${stdName}%'
AND STDGENDER = #{stdGender}
SELECT
id , stdno , stdname ,stdgender , stdage , stdmajor , stdclass
FROM STUDENTS
SELECT
id , stdno , stdname ,stdgender , stdage , stdmajor , stdclass
FROM STUDENTS
SELECT
id , stdno , stdname ,stdgender , stdage , stdmajor , stdclass
FROM ROLES
4、SpringBoot配置
#
spring.datasource.username=root
spring.datasource.password=maxkey
spring.datasource.url=jdbc:mysql://localhost/test?autoReconnect=true&characterEncoding=UTF-8&serverTimezone=UTC
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
mybatis.dialect=mysql
mybatis.type-aliases-package=org.apache.mybatis.jpa.test.entity
mybatis.mapper-locations=classpath*:/org/apache/mybatis/jpa/test/dao/persistence/xml/${mybatis.dialect}/*.xml
mybatis.table-column-escape=true
#mybatis.table-column-escape-char=`
5、本次发布更新
1、StrUtils.firstToLowerCase改为StringUtils.uncapitalize
2、IdStrategy 重命名 IdentifierStrategy
3、consts优化
4、Query实体查询的逻辑删除标记
5、修复query.in问题
6、代码格式tab to 4 space
7、新增enum OrderBy
8、新增 exists(Query query)和exists(LambdaQuery lambdaQuery)
9、代码优化与整合
