springdata-jpa 八种查询方法
使用：maven+Spring+jpa+Junit4
查询方式：SQL，JPQL查询，Specification多条件复杂查询
返回类型：list<POJO>,list<Stinrg>,list<Object>,Page<Object>
git源码地址：https://github.com/litblank/SpringFrame/tree/master/DEMO/SpringData_jpa
1. Pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.litblack</groupId> <artifactId>SpringData_jpa</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>SpringData_jpa Maven Webapp</name> <url>http://maven.apache.org</url> <properties> <spring.version>4.3.4.RELEASE</spring.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> <!-- jpa --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-core</artifactId> <version>4.3.8.Final</version> <exclusions> <exclusion> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> </exclusion> </exclusions> </dependency> <!-- <dependency> <groupId>org.hibernate.javax.persistence</groupId> <artifactId>hibernate-jpa-2.0-api</artifactId> <version>1.0.1.Final</version> </dependency> --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-entitymanager</artifactId> <version>4.3.11.Final</version> <exclusions> <exclusion> <groupId>org.javassist</groupId> <artifactId>javassist</artifactId> </exclusion> </exclusions> </dependency> <!-- oracle --> <dependency> <groupId>ojdbc</groupId> <artifactId>ojdbc6</artifactId> <version>11.2.0.4</version> </dependency> <!-- mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.6</version> </dependency> <!-- ali 数据源连接 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.31</version> </dependency> <dependency> <groupId>javassist</groupId> <artifactId>javassist</artifactId> <version>3.12.1.GA</version> </dependency> <!-- Test --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> <scope>test</scope> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-oxm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring.version}</version> </dependency> <!-- springdata --> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-jpa</artifactId> <version>1.11.1.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.data</groupId> <artifactId>spring-data-commons-core</artifactId> <version>1.4.1.RELEASE</version> </dependency> </dependencies> <build> <finalName>SpringData_jpa</finalName> </build> </project>
2. Spring-config.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:p="http://www.springframework.org/schema/p" xmlns:cache="http://www.springframework.org/schema/cache" 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-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd http://www.springframework.org/schema/data/repository http://www.springframework.org/schema/data/repository/spring-repository-1.5.xsd"> <context:component-scan base-package="com.litblack.jpa"></context:component-scan> <!-- 配置Spring Data JPA扫描目录, repository 包 --> <jpa:repositories base-package="com.litblack.jpa" /> <!-- 定义实体管理器工厂 --> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <!-- 扫描pojo --> <property name="packagesToScan" value="com.litblack.jpa" /> <property name="persistenceProvider"> <bean class="org.hibernate.ejb.HibernatePersistence" /> </property> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <property name="generateDdl" value="true" /> <property name="database" value="MYSQL" /> <!-- <property name="database" value="ORACLE" /> --> <!-- <property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" /> --> <property name="showSql" value="true" /> </bean> </property> <property name="jpaDialect"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" /> </property> <property name="jpaPropertyMap"> <map> <entry key="hibernate.generate_statistics" value="false" /><!-- 关闭打印的日志 --> <entry key="hibernate.query.substitutions" value="true 1, false 0" /> <entry key="hibernate.default_batch_fetch_size" value="16" /> <entry key="hibernate.max_fetch_depth" value="2" /> <entry key="hibernate.bytecode.use_reflection_optimizer" value="true" /> <entry key="hibernate.cache.use_second_level_cache" value="false" /> <entry key="hibernate.cache.use_query_cache" value="false" /> </map> </property> </bean> <!-- 数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <property name="url" value="jdbc:mysql://localhost:3306/cyd?useUnicode=true&characterEncoding=UTF-8" /> <property name="username" value="root" /> <property name="password" value="root" /> </bean> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <!-- 启用 annotation事务 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
3. UserBean.java
package com.litblack.jpa; import java.util.Date; import javax.persistence.Column; import javax.persistence.Entity; import javax.persistence.GeneratedValue; import javax.persistence.Id; import javax.persistence.Table; import org.hibernate.annotations.GenericGenerator; import org.springframework.stereotype.Component; @Table(name = "cyd_sys_user") @Entity public class UserBean { @Id @GeneratedValue(generator = "system_uuid") @GenericGenerator(name = "system_uuid", strategy = "uuid") private String id; @Column(name="user_name") private String userName; @Column(name="create_time") private Date createTime; public String getId() { return id; } public void setId(String id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } @Override public String toString() { return "UserBean [id=" + id + ", userName=" + userName + ", createTime=" + createTime + "]"; } }
4. UserBeanRepository.java
package com.litblack.jpa; import java.util.List; import java.util.Map; import org.springframework.data.domain.Page; import org.springframework.data.domain.Pageable; import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.data.jpa.repository.JpaSpecificationExecutor; import org.springframework.data.jpa.repository.Query; /** * SQL，JPQL查询 * 返回：list<POJO>,list<Stinrg>,list<Object>,Page<Object> * 不能返回MAP * @author chenyd * 2018年1月10日 */ public interface UserBeanRepository extends JpaRepository<UserBean, Long>, JpaSpecificationExecutor<UserBean>{ UserBean findByUserName(String username); @Query("from UserBean where userName =?1") List<UserBean> find_Jpql_list_obj(String username); @Query("select userName from UserBean where userName =?1") List<String> find_Jpql_list_one(String username); @Query("select userName,createTime from UserBean where userName =?1") List<Object> find_Jpql_list_morefield(String username); @Query("select userName,createTime from UserBean ") List<Object> find_Jpql_list_pojo_morefield(); /** * 若返回类型为POJO，必须是所有POJO的所有字段，不能只查询某个字段 */ @Query(value="select * from cyd_sys_user",nativeQuery=true) List<UserBean> find_SQL_pojo(); @Query(value="select user_name,name from cyd_sys_user,t_user",nativeQuery=true) List<Object> find_SQL_obj();
@Query(value = "select new map(userName,createTime) from UserBean")
List<Map<String,Object>> find_SQL_obj_map(); /** * 分页需要 #pageable 标识 * NativeJpaQuery * @param pageable * @return */ @Query(value="select user_name,name from cyd_sys_user,t_user /*#pageable*/ ",countQuery="select count(*) from cyd_sys_user,t_user",nativeQuery=true) Page<Object> find_SQL_obj(Pageable pageable); }
5. BaseJunit4Test.java
package com.litblack.jpa; import java.util.Date; import java.util.List; import java.util.Map; import javax.persistence.criteria.CriteriaBuilder; import javax.persistence.criteria.CriteriaQuery; import javax.persistence.criteria.Expression; import javax.persistence.criteria.Order; import javax.persistence.criteria.Predicate; import javax.persistence.criteria.Root; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.data.domain.Page; import org.springframework.data.domain.PageRequest; import org.springframework.data.domain.Pageable; import org.springframework.data.domain.Sort; import org.springframework.data.domain.Sort.Direction; import org.springframework.data.jpa.domain.Specification; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = { "classpath*:/spring-config.xml" }) public class BaseJunit4Test { @Autowired private UserBeanRepository userRepository; /** * 保存 */ public void save_obj() { System.out.println(userRepository); for (int i = 0; i < 100; i++) { UserBean entity = new UserBean(); entity.setUserName("user_" + i); entity.setCreateTime(new Date()); userRepository.save(entity); } } /** * 查询-所有 */ public void get_ALL_obj(){ List<UserBean> list=userRepository.findAll(); for (int i = 0; i < list.size(); i++) { UserBean obj = list.get(i); System.out.println(obj.getCreateTime()); } } /** * 查询-one-obj,自定义接口 */ public void get_one_obj(){ UserBean obj = userRepository.findByUserName("user_1"); System.out.println(obj.toString()); } /** * 根据JQPL查询，获取一个包含所有字段的OBJ * 返回: 一个pojo 集合 */ public void get_jqpl_obj(){ List<UserBean> list=userRepository.find_Jpql_list_obj("user_2"); for (int i = 0; i < list.size(); i++) { UserBean obj = list.get(i); System.out.println(obj.toString()); } } /** * 根据JQPL查询,获取一个字段， * 返回：一个字段 */ public void get_jqpl_onestr(){ List<String> list=userRepository.find_Jpql_list_one("user_2"); for (int i = 0; i < list.size(); i++) { String obj = list.get(i); System.out.println(obj.toString()); } } /** * 根据JQPL查询,一行数据，获取多个字段 * 返回：object 不是POJO,不是string[]。是Object[] * 注意：每个数据类型与POJO类型一致 */ public void get_jqpl_morestr(){ List<Object> list=userRepository.find_Jpql_list_morefield("user_2"); for (int i = 0; i < list.size(); i++) { Object[] obj = (Object[]) list.get(i); String username=(String) obj[0]; Date date=(Date) obj[1]; System.out.println(username+"\t"+date); } } /** * JQPL 获取指定字段的多个POJO */ public void get_jqpl_pojo_morestr(){ List<Object> list=userRepository.find_Jpql_list_pojo_morefield(); for (int i = 0; i < list.size(); i++) { Object[] obj = (Object[]) list.get(i); String username=(String) obj[0]; Date date=(Date) obj[1]; System.out.println(username+"\t"+date); } } /** * SQL 获取POJO的所有字段，必须是所有POJO的所有字段 */ public void get_sql_pojo_allstr(){ List<UserBean> list=userRepository.find_SQL_pojo(); for (int i = 0; i < list.size(); i++) { UserBean obj = list.get(i); System.out.println(obj.toString()); } } /** * SQL 获取多表查询的字段,可用于多表查询，组成临时表 * 注意：每个数据类型与POJO类型一致 */ public void get_sql_obj_morestr(){ List<Object> list=userRepository.find_SQL_obj(); for (int i = 0; i < list.size(); i++) { Object[] obj = (Object[]) list.get(i); String username=(String) obj[0]; String name=(String) obj[1]; System.out.println(username+"\t"+name); } }
/**
* Hql 能返回list<Map>
*/
@Test
public void get_sql_obj_morestr1(){
List<Map<String,Object>> list=userRepository.find_SQL_obj_map();
for (int i = 0; i < list.size(); i++) {
Map<String,Object> obj = list.get(i);
System.out.println(obj);
}
} /** * 分页查询,先排序后分页 * select user_name,name from cyd_sys_user,t_user order by user_name desc limit ?, ? */ public void get_sql_obj_morestr_page(){ Sort sort=new Sort(Direction.DESC,"user_name"); Pageable page=new PageRequest(2,10,sort);//第二页，每页10条 Page<Object> p=userRepository.find_SQL_obj(page); List<Object> list=p.getContent(); for (int i = 0; i < list.size(); i++) { Object[] obj = (Object[]) list.get(i); String username=(String) obj[0]; String name=(String) obj[1]; System.out.println(username+"\t"+name); } } /** * 多条件查询,分页,排序 */ public void get_sql_obj_morestr_(){ Page<UserBean> p=userRepository.findAll(new Specification<UserBean>() { public Predicate toPredicate(Root<UserBean> root, CriteriaQuery<?> query, CriteriaBuilder cb) { Predicate stuNameLike = cb.like(root.<String> get("userName"), "%user_%"); Order oderby =cb.desc(root.<String> get("userName")); if(null != stuNameLike) query.where(stuNameLike); query.orderBy(oderby); return stuNameLike; } },new PageRequest(0, 20)); List<UserBean> list=p.getContent(); for (int i = 0; i < list.size(); i++) { UserBean obj = list.get(i); System.out.println(obj.toString()); } } /** * 通用单个实体查询 * @param T * @return */ public <T> Specification base_Specification(Class T){ return new Specification<T>(){ public Predicate toPredicate(Root<T> root, CriteriaQuery<?> query, CriteriaBuilder cb) { Predicate predicate=cb.conjunction(); List<Expression<Boolean>> expression=predicate.getExpressions(); expression.add(cb.like(root.<String> get(""), "")); return predicate; }}; } }
