1. Repository接口?

1.1. Repository接口是Spring Data JPA中為我我們提供的所有接口中的頂層接口。

1.2. Repository提供了兩種查詢方式的支持?

1.2.1. 基于方法名稱命名規則查詢。

1.2.2. 基于@Query注解查詢。

2. 方法名稱命名規則查詢

2.1. 規則: findBy(關鍵字)+屬性名稱(屬性名稱的首字母大寫)+查詢條件(首字母大寫)。

2.2. 方法名稱命名規則查詢列表

關鍵字	方法命名	sql語句
	findByName(String name)	where name=?
Is	findByNameIs(String name)	where name=?
Equals	findByNameEquals(String name)	where name=?
And	findByNameAndSex(String name, String sex)	where name=? and sex=?
Or	findByIdOrName(Integer id, String name)	where id=? or name=?
Between	findByIdBetween(Integer x, Integer y)	where id between ? and ?
LessThan	findByIdLessThan(Integer x)	where id<?
LessThanEqual	findByIdLessThanEqual(Integer x)	where id<=?
GreaterThan	findByIdGreaterThan(Integer x)	where id>?
GreaterThanEqual	findByIdGreaterThanEqual(Integer x)	where id>=?
After	findByIdAfter(Integer x)	where id>?
Before	findByIdBefore(Integer x)	where id<?
IsNull	findByNameIsNull()	where name is null
IsNotNull	findByNameIsNotNull()	where name is not null
NotNull	findByNameNotNull()	where name is not null
Like	findByNameLike(String name)	where name like ?
NotLike	findByNameNotLike(String name)	where name not like ?
StartingWith	findByNameStartingWith(String name)	where name like ?%
EndingWith	findByNameEndingWith(String name)	where name like %?
Containing	findByNameContaining(String name)	where name like %?%
OrderBy	findBySexOrderByIdDesc(String sex)	where sex=? order by id desc
Not	findByNameNot(String name)	where name <> ?
In	findByIdIn(Collection<Integer> c)	where id in (?)
NotIn	findByIdNotIn(Collection<Integer> c)	where id not in (?)

3. 方法名稱命名規則查詢例子?

3.1. 創建一個名為spring-data-jpa-naming的Java項目, 同時添加相關jar包, 并添加JUnit能力。

3.2. 新建User.java?

package com.bjbs.pojo;import java.io.Serializable; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; import javax.persistence.Table; import org.springframework.format.annotation.DateTimeFormat;@Entity // 指定該類是實體類 @Table(name = "user") // 指定數據庫表名(表名和實體類對應) public class User implements Serializable {private static final long serialVersionUID = 1L;@Id // 指定為主鍵@GeneratedValue(strategy = GenerationType.IDENTITY) // 指定主鍵生成策略@Column(name = "id") // 指定表中列名(列名和屬性名對應)private Integer id;@Column(name = "name")private String name;@Column(name = "sex")private String sex;@Column(name = "birthday")@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")private Date birthday;@Column(name = "address")private String address;public User() {}public User(String name, String sex, Date birthday, String address) {this.name = name;this.sex = sex;this.birthday = birthday;this.address = address;}public User(Integer id, String name, String sex, Date birthday, String address) {this.id = id;this.name = name;this.sex = sex;this.birthday = birthday;this.address = address;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}@Overridepublic String toString() {return "User [id=" + id + ", name=" + name + ", sex=" + sex + ", birthday=" + birthday + ", address=" + address+ "]";} }

3.3. 新建UserRepository.java, 實現Repository

package com.bjbs.dao;import java.util.Collection; import java.util.List; import org.springframework.data.repository.Repository; import com.bjbs.pojo.User;/*** 參數一T: 當前需要映射的實體; 參數二 T: 當前映射的實體中的id的類型*/ public interface UserRepository extends Repository<User, Integer> {/*** 判斷相等*/User findByName(String name);User findByNameIs(String name);User findByNameEquals(String name);/*** And語句*/User findByNameAndSex(String name, String sex);/*** Or語句*/List<User> findByIdOrName(Integer id, String name);/*** Between語句*/List<User> findByIdBetween(Integer x, Integer y);/*** < x*/List<User> findByIdLessThan(Integer x);/*** <= x*/List<User> findByIdLessThanEqual(Integer x);/*** > x*/List<User> findByIdGreaterThan(Integer x);/*** >= x*/List<User> findByIdGreaterThanEqual(Integer x);/*** > x*/List<User> findByIdAfter(Integer x);/*** < x*/List<User> findByIdBefore(Integer x);/*** IsNull語句*/List<User> findByNameIsNull();/*** IsNotNull語句*/List<User> findByNameIsNotNull();/*** NotNull語句*/List<User> findByNameNotNull();/*** Like語句*/List<User> findByNameLike(String name);/*** NotLike語句*/List<User> findByNameNotLike(String name);/*** Like name%*/List<User> findByNameStartingWith(String name);/*** Like %name*/List<User> findByNameEndingWith(String name);/*** Like %name%*/List<User> findByNameContaining(String name);/*** OrderBy語句*/List<User> findBySexOrderByIdDesc(String sex);/*** Not語句*/List<User> findByNameNot(String name);/*** In語句*/List<User> findByIdIn(Collection<Integer> c);/*** NotIn語句*/List<User> findByIdNotIn(Collection<Integer> c); }

3.4. 新建UserService.java

package com.bjbs.service;import java.util.Collection; import java.util.List; import com.bjbs.pojo.User;public interface UserService {User findByName(String name);User findByNameIs(String name);User findByNameEquals(String name);User findByNameAndSex(String name, String sex);List<User> findByIdOrName(Integer id, String name);List<User> findByIdBetween(Integer x, Integer y);List<User> findByIdLessThan(Integer x);List<User> findByIdLessThanEqual(Integer x);List<User> findByIdGreaterThan(Integer x);List<User> findByIdGreaterThanEqual(Integer x);List<User> findByIdAfter(Integer x);List<User> findByIdBefore(Integer x);List<User> findByNameIsNull();List<User> findByNameIsNotNull();List<User> findByNameNotNull();List<User> findByNameLike(String name);List<User> findByNameNotLike(String name);List<User> findByNameStartingWith(String name);List<User> findByNameEndingWith(String name);List<User> findByNameContaining(String name);List<User> findBySexOrderByIdDesc(String sex);List<User> findByNameNot(String name);List<User> findByIdIn(Collection<Integer> c);List<User> findByIdNotIn(Collection<Integer> c); }

3.5. 新建UserServiceImpl.java

package com.bjbs.service.impl;import java.util.Collection; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.bjbs.dao.UserRepository; import com.bjbs.pojo.User; import com.bjbs.service.UserService;@Service @Transactional public class UserServiceImpl implements UserService {@Autowiredprivate UserRepository userRepository;@Overridepublic User findByName(String name) {return userRepository.findByName(name);}@Overridepublic User findByNameIs(String name) {return userRepository.findByNameIs(name);}@Overridepublic User findByNameEquals(String name) {return userRepository.findByNameEquals(name);}@Overridepublic User findByNameAndSex(String name, String sex) {return userRepository.findByNameAndSex(name, sex);}@Overridepublic List<User> findByIdOrName(Integer id, String name) {return userRepository.findByIdOrName(id, name);}@Overridepublic List<User> findByIdBetween(Integer x, Integer y) {return userRepository.findByIdBetween(x, y);}@Overridepublic List<User> findByIdLessThan(Integer x) {return userRepository.findByIdLessThan(x);}@Overridepublic List<User> findByIdLessThanEqual(Integer x) {return userRepository.findByIdLessThanEqual(x);}@Overridepublic List<User> findByIdGreaterThan(Integer x) {return userRepository.findByIdGreaterThan(x);}@Overridepublic List<User> findByIdGreaterThanEqual(Integer x) {return userRepository.findByIdGreaterThanEqual(x);}@Overridepublic List<User> findByIdAfter(Integer x) {return userRepository.findByIdAfter(x);}@Overridepublic List<User> findByIdBefore(Integer x) {return userRepository.findByIdBefore(x);}@Overridepublic List<User> findByNameIsNull() {return userRepository.findByNameIsNull();}@Overridepublic List<User> findByNameIsNotNull() {return userRepository.findByNameIsNotNull();}@Overridepublic List<User> findByNameNotNull() {return userRepository.findByNameIsNotNull();}@Overridepublic List<User> findByNameLike(String name) {return userRepository.findByNameLike(name);}@Overridepublic List<User> findByNameNotLike(String name) {return userRepository.findByNameNotLike(name);}@Overridepublic List<User> findByNameStartingWith(String name) {return userRepository.findByNameStartingWith(name);}@Overridepublic List<User> findByNameEndingWith(String name) {return userRepository.findByNameEndingWith(name);}@Overridepublic List<User> findByNameContaining(String name) {return userRepository.findByNameContaining(name);}@Overridepublic List<User> findBySexOrderByIdDesc(String sex) {return userRepository.findBySexOrderByIdDesc(sex);}@Overridepublic List<User> findByNameNot(String name) {return userRepository.findByNameNot(name);}@Overridepublic List<User> findByIdIn(Collection<Integer> c) {return userRepository.findByIdIn(c);}@Overridepublic List<User> findByIdNotIn(Collection<Integer> c) {return userRepository.findByIdNotIn(c);}}

3.6. 新建TestUserRepository.java

package com.bjbs.test;import java.util.ArrayList; import java.util.Collection; import java.util.List; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.bjbs.pojo.User; import com.bjbs.service.UserService;@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration("classpath:applicationContext.xml") public class TestUserRepository {@Autowiredprivate UserService userService;/*** 查詢姓名等于'曹操'的用戶*/@Testpublic void findByName() {User user = userService.findByName("曹操");System.out.println(user);}/*** 查詢姓名等于'曹操'的用戶*/@Testpublic void findByNameIs() {User user = userService.findByNameIs("曹操");System.out.println(user);}/*** 查詢姓名等于'曹操'的用戶*/@Testpublic void findByNameEquals() {User user = userService.findByNameEquals("曹操");System.out.println(user);}/*** 查詢姓名等于'曹操'并且性別等于'男'的用戶*/@Testpublic void findByNameAndSex() {User user = userService.findByNameAndSex("曹操", "男");System.out.println(user);}/*** 查詢id等于37或的姓名等于'曹操'所有用戶*/@Testpublic void findByIdOrName() {List<User> list = userService.findByIdOrName(37, "曹操");for (User user : list) {System.out.println(user);}}/*** 查詢id在30-35之間的所有用戶(包括id是30和35的用戶)*/@Testpublic void findByIdBetween() {List<User> list = userService.findByIdBetween(30, 35);for (User user : list) {System.out.println(user);}}/*** 查詢id<33的所有用戶*/@Testpublic void findByIdLessThan() {List<User> list = userService.findByIdLessThan(33);for (User user : list) {System.out.println(user);}}/*** 查詢id<=33的所有用戶*/@Testpublic void findByIdLessThanEqual() {List<User> list = userService.findByIdLessThanEqual(33);for (User user : list) {System.out.println(user);}}/*** 查詢id>55的所有用戶*/@Testpublic void findByIdGreaterThan() {List<User> list = userService.findByIdGreaterThan(55);for (User user : list) {System.out.println(user);}}/*** 查詢id>=55的所有用戶*/@Testpublic void findByIdGreaterThanEqual() {List<User> list = userService.findByIdGreaterThanEqual(55);for (User user : list) {System.out.println(user);}}/*** 查詢id>55的所有用戶*/@Testpublic void findByIdAfter() {List<User> list = userService.findByIdAfter(55);for (User user : list) {System.out.println(user);}}/*** 查詢id<33的所有用戶*/@Testpublic void findByIdBefore() {List<User> list = userService.findByIdBefore(33);for (User user : list) {System.out.println(user);}}/*** 查詢姓名為Null的所有用戶*/@Testpublic void findByNameIsNull() {List<User> list = userService.findByNameIsNull();for (User user : list) {System.out.println(user);}}/*** 查詢姓名不是空的所有用戶*/@Testpublic void findByNameIsNotNull() {List<User> list = userService.findByNameIsNotNull();for (User user : list) {System.out.println(user);}}/*** 查詢姓名不是空的所有用戶*/@Testpublic void findByNameNotNull() {List<User> list = userService.findByNameNotNull();for (User user : list) {System.out.println(user);}}/*** 查詢姓名包含'河公'的所有用戶*/@Testpublic void findByNameLike() {List<User> list = userService.findByNameLike("%河公%");for (User user : list) {System.out.println(user);}}/*** 查詢姓名不是以'操'結尾的所有用戶*/@Testpublic void findByNameNotLike() {List<User> list = userService.findByNameNotLike("%操");for (User user : list) {System.out.println(user);}}/*** 查詢姓名以'李'開頭的所有用戶*/@Testpublic void findByNameStartingWith() {List<User> list = userService.findByNameStartingWith("李");for (User user : list) {System.out.println(user);}}/*** 查詢姓名以'操'結尾的所有用戶*/@Testpublic void findByNameEndingWith() {List<User> list = userService.findByNameEndingWith("操");for (User user : list) {System.out.println(user);}}/*** 查詢姓名包含'河公'的所有用戶*/@Testpublic void findByNameContaining() {List<User> list = userService.findByNameContaining("河公");for (User user : list) {System.out.println(user);}}/*** 查詢性別是'女'的所有用戶并按id倒序排列*/@Testpublic void findBySexOrderByIdDesc() {List<User> list = userService.findBySexOrderByIdDesc("女");for (User user : list) {System.out.println(user);}}/*** 查詢姓名不是'曹操'的所有用戶*/@Testpublic void findByNameNot() {List<User> list = userService.findByNameNot("曹操");for (User user : list) {System.out.println(user);}}/*** 查詢id是35 42 43 44的這幾個用戶*/@Testpublic void findByIdIn() {Collection<Integer> c = new ArrayList<Integer>();c.add(35);c.add(42);c.add(43);c.add(44);List<User> list = userService.findByIdIn(c);for (User user : list) {System.out.println(user);}}/*** 查詢id不是35 42 43 44的所有用戶*/@Testpublic void findByIdNotIn() {Collection<Integer> c = new ArrayList<Integer>();c.add(35);c.add(42);c.add(43);c.add(44);List<User> list = userService.findByIdNotIn(c);for (User user : list) {System.out.println(user);}} }

3.7. 在src下新建application.properties

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://192.168.25.138:3306/StudyMybatis?useSSL=true&useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai spring.datasource.username=root spring.datasource.password=lyw123456

3.8. 在src下新建applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?> <beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://www.springframework.org/schema/beans"xmlns:context="http://www.springframework.org/schema/context"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:jpa="http://www.springframework.org/schema/data/jpa"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"><!-- 配置讀取properties文件的工具類 --><context:property-placeholder location="classpath:application.properties" /><!-- 配置c3p0數據庫連接池 --><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="jdbcUrl" value="${spring.datasource.url}" /><property name="driverClass" value="${spring.datasource.driverClassName}" /><property name="user" value="${spring.datasource.username}" /><property name="password" value="${spring.datasource.password}" /></bean><!-- Spring整合JPA 配置EntityManagerFactory --><bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"><property name="dataSource" ref="dataSource" /><property name="jpaVendorAdapter"><bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"><!-- hibernate相關的屬性的注入 --><!-- 配置數據庫類型 --><property name="database" value="MYSQL" /><!-- 正向工程 自動創建表 --><!-- <property name="generateDdl" value="true" /> --><!-- 顯示執行的SQL --><property name="showSql" value="true" /></bean></property><!-- 掃描實體的包 --><property name="packagesToScan"><list><value>com.bjbs.pojo</value></list></property></bean><!-- 配置Hibernate的事務管理器 --><bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"><property name="entityManagerFactory" ref="entityManagerFactory" /></bean><!-- 配置開啟注解事務處理 --><tx:annotation-driven transaction-manager="transactionManager" /><!-- 配置springIOC的注解掃描 --><context:component-scan base-package="com.bjbs.service" /><!-- Spring Data JPA 的配置 --><!-- base-package: 掃描dao接口所在的包 --><jpa:repositories base-package="com.bjbs.dao" /> </beans>

3.9. 數據庫user表

3.10. 查詢姓名等于'曹操'的用戶?

3.11. 查詢姓名等于'曹操'的用戶?

3.12. 查詢姓名等于'曹操'的用戶?

3.13. 查詢姓名等于'曹操'并且性別等于'男'的用戶?

3.14. 查詢id等于37或的姓名等于'曹操'多個用戶?

3.15. 查詢id在30-35之間的所有用戶(包括id是30和35的用戶)?

3.16. 查詢id<33的所有用戶?

3.17. 查詢id<=33的所有用戶?

3.18. 查詢id>55的所有用戶?

3.19. 查詢id>=55的所有用戶?

3.20. 查詢id>55的所有用戶?

3.21. 查詢id<33的所有用戶?

3.22. 查詢姓名為Null的所有用戶

?3.23. 查詢姓名不是空的所有用戶?

3.24. 查詢姓名不是空的所有用戶

3.25. 查詢姓名包含'河公'的所有用戶

3.26. 查詢姓名不是以'操'結尾的所有用戶?

?3.27. 查詢姓名以'李'開頭的所有用戶

3.28. 查詢姓名以'操'結尾的所有用戶?

3.29. 查詢姓名包含'河公'的所有用戶

3.30. 查詢性別是'女'的所有用戶并按id倒序排列

3.31. 查詢姓名不是'曹操'的所有用戶?

?3.32. 查詢id是35 42 43 44的這幾個用戶

?3.33. 查詢id不是35 42 43 44的所有用戶

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