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>
1、新增注解
@ Temporal
@ PartitionKey
@ ColumnDefault
@ ColumnLogic
2、@ GeneratedValue默认生成雪花id
3、增加逻辑删除的功能
4、新增单表分页查询fetch方法，支持条件Query和实体两种参数
5、queryPageResults改为fetchPageResults
6、增加多租户分布注解@PartitionKey
7、分页查询优化
8、代码调整和优化
