应用介绍

MyBatis JPA Extra

MyBatis JPA Extra对MyBatis扩大JPA功能

1.Jakarta JPA 3注释简化CUID操作;

2.加强SELECT分页查询;

    //根据Lambda链式前提构造器查询    //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链式前提构造器分页查询    //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

3.链式Query查询前提构造器；支撑Lambda 情势调用，便利编写各类查询前提

4.@Encrypted注解轻松实现字段数据加密和解密;

5.字段数据主动填充功能;

6.数据库支撑

数据库 支撑 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
• @PartitionKey
• @SoftDelete

1.2、主键策略

支撑3种主键Id策略

序号 策略 支撑 1 AUTO 主键主动填充策略 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    private LocalDateTime modifyDate;    @SoftDelete    @Column(name ="is_deleted")    private int isDeleted;    //getter setter}

2、根本操作

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UpdateWrapper更新数据    UpdateWrapper updateWrapper = new UpdateWrapper();    updateWrapper.set("StdMajor", "汗青").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, "汗青")                 .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

    //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的查询方法 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}                        );    }    //根据链式前提构造器查询    //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前提分页查询 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设备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中设备    @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

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、默认数据主动填充

持续FieldAutoFillHandler，实现insertFill和updateFill函数，可以完成租户字段，创建人、创建时光、修改人、修改时光等默认字段的填充

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设备

#spring.datasource.username=rootspring.datasource.password=maxkeyspring.datasource.url=jdbc:mysql://localhost/test?autoReconnect=true&characterEncoding=UTF-8&serverTimezone=UTCspring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.type=com.alibaba.druid.pool.DruidDataSourcemybatis.dialect=mysqlmybatis.type-aliases-package=org.apache.mybatis.jpa.test.entitymybatis.mapper-locations=classpath*:/org/apache/mybatis/jpa/test/dao/persistence/xml/${mybatis.dialect}/*.xmlmybatis.table-column-escape=true#mybatis.table-column-escape-char=`#mybatis.configuration.map-underscore-to-camel-case=true

5、版本更新

            WHERE   1   =   1                    AND ID  =   '${id}'                            AND STDNAME like '%${stdName}%'                            AND STDGENDER   =   #{stdGender}                            <![CDATA[AND    STDMAJOR    = #{stdMajor}]]>                    <select id="fetchPageResults" parameterType="Students" resultType="Students">        SELECT             id , stdno , stdname ,stdgender , stdage , stdmajor , stdclass         FROM STUDENTS             </select>      <select id="fetchPageResults1" parameterType="Students" resultType="Students">        SELECT             id , stdno , stdname ,stdgender , stdage , stdmajor , stdclass         FROM STUDENTS             </select>            <select id="queryBy" parameterType="Students" resultType="Students">        SELECT             id , stdno , stdname ,stdgender , stdage , stdmajor , stdclass         FROM ROLES             </select>

4、SpringBoot设备

1、JpaPage 增长of办法2、demo mybatis-config.xml优化，增长MybatisConfigInit和代码调剂3、删除冗余的代码4、dbcp2依附和支撑5、spring 4支撑的优化6、编译脚本优化7、新logo优化8、findBy优化懈弛存优化9、JpaRepositoryImpl优化10、移除remove @TeMPOraL支撑11、日记输出优化12、批量插入功能优化13、新增IJpaCrudMapper ，IJpaRepository增长findById14、新增deleteById15、IJpaMapper新方法16、依附进级springboot 4.0.1