基于SpringBoot的Jpa查询
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工作需要，用到了jpa，很久没用了，忘了，写一个简单的demo，方便日后查看。
数据库配置文件
在SpringBoot中，application.properties的配置：注意，SpringBoot会默认有数据源的配置，否则启动报错不需要，则在启动类当中加上如下注解：
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class,DataSourceTransactionManagerAutoConfiguration.class,HibernateJpaAutoConfiguration.class})application.properties的配置：
spring.datasource.url=jdbc:mysql://localhost:3306/db_electric_car?useUnicode=true&characterEncoding=UTF-8&useSSL=falsespring.datasource.username=rootspring.datasource.password=rootspring.datasource.driverClassName=com.mysql.jdbc.Driverspring.datasource.max-idle=10 spring.datasource.max-wait=10000 spring.datasource.min-idle=5 spring.datasource.initial-size=5 spring.jpa.hibernate.ddl-auto=updatespring.jpa.show-sql=truespring.jackson.serialization.indent_output=true新建一个实体类：
package com.cn.restyle.entity;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;@Entity@Table(name ="tb_app_user") // 对应数据库表名public class AppUser { @Id @GeneratedValue(strategy=GenerationType.IDENTITY) // id自增 private Integer id; private String mobile; private String pass; @Column(name="os") // 此注解映射实体和数据库字段不一致的情况 private String osString; private String brand; @Column(name="create_time") private Date createTime; @Column(name="update_time") private Date updateTime; private Integer isDelete; public AppUser(){} public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getMobile() { return mobile; } public void setMobile(String mobile) { this.mobile = mobile; } public String getPass() { return pass; } public void setPass(String pass) { this.pass = pass; } public String getOsString() { return osString; } public void setOsString(String osString) { this.osString = osString; } public String getBrand() { return brand; } public void setBrand(String brand) { this.brand = brand; } public Date getCreateTime() { return createTime; } public void setCreateTime(Date createTime) { this.createTime = createTime; } public Date getUpdateTime() { return updateTime; } public void setUpdateTime(Date updateTime) { this.updateTime = updateTime; } public Integer getIsDelete() { return isDelete; } public void setIsDelete(Integer isDelete) { this.isDelete = isDelete; } public AppUser(Integer id, String mobile, String pass, String osString, String brand, Date createTime, Date updateTime, Integer isDelete) { super(); this.id = id; this.mobile = mobile; this.pass = pass; this.osString = osString; this.brand = brand; this.createTime = createTime; this.updateTime = updateTime; this.isDelete = isDelete; } @Override public String toString() { return "AppUser [id=" + id + ", mobile=" + mobile + ", pass=" + pass + ", osString=" + osString + ", brand=" + brand + ", createTime=" + createTime + ", updateTime=" + updateTime + ", isDelete=" + isDelete + "]"; }}本人习惯运用的工具类Result：
package com.cn.restyle.unit;public class Result<T> { public static final Integer OK = 0; public static final Integer error = -1; private Integer code; private String msg; private T data; public Result(){ this.code = OK; this.msg = "success"; } public Result(Integer code, String msg) { super(); this.code = code; this.msg = msg; } public Result(Integer code, String msg, T data) { this.code = code; this.msg = msg; this.data = data; } public Result(T data) { super(); this.data = data; } public Integer getCode() { return code; } public void setCode(Integer code) { this.code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public T getData() { return data; } public void setData(T data) { this.data = data; } public static Integer getOk() { return OK; } public static Integer getError() { return error; }}定义接口：
package com.cn.restyle.mapper;import org.apache.ibatis.annotations.Param;import org.springframework.data.jpa.repository.JpaRepository;import org.springframework.data.jpa.repository.Query;import org.springframework.stereotype.Repository;import com.cn.restyle.entity.AppUser;@Repositorypublic interface AppUserMapper extends JpaRepository<AppUser, Long>{ AppUser findByMobile(String mobile); AppUser findByMobileAndPass(String mobile,String pass); @Query("select u from AppUser u where u.mobile = :mobile and u.pass = :pass") AppUser withMobleAndPassQuery(@Param("mobile")String mobile,@Param("pass")String pass);}注意，我在这踩了个坑，以前 @Query(“select u from AppUser u where u.mobile = :mobile and u.pass = :pass”)，我是这么写的，后来运行的时候，报错
2017-11-23 15:55:37.519 INFO 11188 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 35 ms2017-11-23 15:55:37.600 ERROR 11188 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: Name for parameter binding must not be null or empty! On JDKs < 8, you need to use @Param for named parameters, on JDK 8 or better, be sure to compile with -parameters.; nested exception is java.lang.IllegalArgumentException: Name for parameter binding must not be null or empty! On JDKs < 8, you need to use @Param for named parameters, on JDK 8 or better, be sure to compile with -parameters.] with root causejava.lang.IllegalArgumentException: Name for parameter binding must not be null or empty! On JDKs < 8, you need to use @Param for named parameters, on JDK 8 or better, be sure to compile with -parameters. at org.springframework.util.Assert.hasText(Assert.java:181) at org.springframework.data.jpa.repository.query.StringQuery.getBindingFor(StringQuery.java:105) at org.springframework.data.jpa.repository.query.StringQueryParameterBinder.getBindingFor(StringQueryParameterBinder.java:75) at org.springframework.data.jpa.repository.query.StringQueryParameterBinder.bind(StringQueryParameterBinder.java:60) at org.springframework.data.jpa.repository.query.ParameterBinder.bind(ParameterBinder.java:101) at org.springframework.data.jpa.repository.query.SpelExpressionStringQueryParameterBinder.bind(SpelExpressionStringQueryParameterBinder.java:76) at org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:161) at org.springframework.data.jpa.repository.query.ParameterBinder.bindAndPrepare(ParameterBinder.java:152) at org.springframework.data.jpa.repository.query.AbstractStringBasedJpaQuery.doCreateQuery(AbstractStringBasedJpaQuery.java:81) at org.springframework.data.jpa.repository.query.AbstractJpaQuery.createQuery(AbstractJpaQuery.java:190) at org.springframework.data.jpa.repository.query.JpaQueryExecution$SingleEntityExecution.doExecute(JpaQueryExecution.java:208) at org.springframework.data.jpa.repository.query.JpaQueryExecution.execute(JpaQueryExecution.java:87) at org.springframework.data.jpa.repository.query.AbstractJpaQuery.doExecute(AbstractJpaQuery.java:116) at org.springframework.data.jpa.repository.query.AbstractJpaQuery.execute(AbstractJpaQuery.java:106) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:483) at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:461) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor.invoke(DefaultMethodInvokingMethodInterceptor.java:56) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:133) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)不知道现在是不能这样写了么？于是我改成这样：问题解决：
@Query("select u from AppUser u where u.mobile = ?1 and u.pass = ?2")Controller中的代码：
package com.cn.restyle.controller;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.cn.restyle.entity.AppUser;import com.cn.restyle.mapper.AppUserMapper;import com.cn.restyle.unit.Result;@RestController@RequestMapping("/v1/spring")public class Example { protected static Logger log = LoggerFactory.getLogger(Example.class); @Autowired AppUserMapper appUserMapper; @RequestMapping("/hell") String home(){ return "Hello Word !"; } @RequestMapping("/hello/{userName}") String index(@PathVariable String userName){ // 从路径当中获取值 return "Hello" + userName; } @RequestMapping("/showData") public Result showData(){ String mobile = "15721429352"; AppUser appUser = appUserMapper.findByMobile(mobile); if (null != appUser) { log.info(appUser.toString()); }else { log.info("数据库当中没有此电话号码"); } return new Result(); } @RequestMapping("/showDataMobileAndPass") public Result showDataMobileAndPass(){ String mobile = "15721429352"; String pass = "654321"; AppUser appUser = appUserMapper.findByMobileAndPass(mobile, pass); if (null != appUser) { log.info(appUser.toString()); }else { log.info("数据库当中没有此电话号码"); } return new Result(appUser); } @RequestMapping("/withMobileAndPass") public Result withMobileAndPass(){ String mobile = "15721429352"; String pass = "654321"; AppUser appUser = appUserMapper.withMobleAndPassQuery(mobile, pass); if (null != appUser) { log.info(appUser.toString()); }else { log.info("数据库当中没有此电话号码"); } return new Result(appUser); }}代码是测试运行过的。先下班。。。过两天有时间再完善
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