springboot jpa链接数据库

一、最近总看见项目中直接在代码里面写sql，而不是使用mapper配置文件，感觉对于轻量级的查询，没有多少查询语句的话，咱就不集成mybatis了，直接写sql不也很好么，于是大概研究了一下，怎么使用。

看，下面的代码就是开发常用的sql写法

 @Query(value = "select recon_roll_result from pay_asset_result where  date = ?1 and type = ?2 and is_deprecated = '0' limit 1", nativeQuery = true)String findReconRollResultByReconDateAndType(String reconDate, String type);

二、讲一下这种sql的搭建过程

1、导入依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.7</version>
</dependency>
<dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version>
</dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.13</version>
</dependency>

2.yml配置文件

# 应用名称
spring:application:name: demodatasource:url: jdbc:mysql://hhhhh.mysql.rds.aliyuncs.com:3306/testone?autoReconnect=true&useUnicode=true&characterEncoding=utf-8&mysqlEncoding=utf-8&useSSL=truetype: com.alibaba.druid.pool.DruidDataSourceusername: rootpassword: 123456driver-class-name: com.mysql.jdbc.Driverjpa:hibernate:ddl-auto: updateshow-sql: true
server:port : 9999

3）写实体类

注：启动工程后，会根据类的里面的属性创建表，name是创建的表名

package com.fourg.testone.db.autotest.entity.jourtestcase;import lombok.Getter;
import lombok.Setter;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;/*** ** @author * @date   2022/04/08*/
@Getter
@Setter
@Entity
@Table(name ="test_case")
public class TestCase {/*** */@Id@Columnprivate Integer id;/*** 作者*/@Columnprivate String author;/*** 用例编号*/@Columnprivate String caseno;/*** 用例描述*/@Columnprivate String casedesc;/*** 是否成功*/@Columnprivate String issuccess;/*** 错误信息*/@Columnprivate String errormsg;/*** 交易类型*/@Columnprivate String casetradetype;/*** 产品*/@Columnprivate String productname;/*** 是否执行*/@Columnprivate String caseenable;/*** 前置条件*/@Columnprivate String casepreset;/*** 参数*/@Columnprivate String caseparam;/*** 断言模板*/@Columnprivate String asserttemplate;/*** 预期断言*/@Columnprivate String exceptasset;/*** 实际结果断言*/@Columnprivate String realresultasset;/*** 借据号*/@Columnprivate String loaninvoiceid;}

4）respository接口编写

package com.fourg.testone.db.autotest.repository.jourtestcase;import com.fourg.testone.db.autotest.entity.jourtestcase.TestCase;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
import org.springframework.data.jpa.repository.Query;
import java.util.List;/*** @Author: * @Date: 2022/4/8 下午4:47*/
public interface JourTestCaseRepository extends JpaRepository<TestCase, Integer> , JpaSpecificationExecutor<TestCase> {@Query(value = "select * from test_case  where author = ?1",nativeQuery = true)List<TestCase> findCaseByAuthor(String Author);
}

5）写controller

package com.fourg.testone.controller;import com.fourg.testone.db.autotest.entity.jourtestcase.TestCase;
import com.fourg.testone.db.autotest.repository.jourtestcase.JourTestCaseRepository;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.ArrayList;
import java.util.List;/*** @Author: * @Date: 2022/4/8 下午4:51*/
@Slf4j
@RequestMapping(value = "casemanage", produces = "application/json")
@RestController
public class CaseController {@Autowiredprivate JourTestCaseRepository jourTestCaseRepository;@GetMapping(path = "getAll")public List<TestCase> getAllCase() {List<TestCase> testCaseList=new ArrayList<>();return testCaseList=jourTestCaseRepository.findCaseByAuthor("钱大郎");
//       return testCaseList=jourTestCaseRepository.findAll();}
}

6）启动项目，会自动在testone库中创建表test_case

访问接口get http://localhost:9999/casemanage/getAll可以获取到数据库里面的数据

把pom文件所有内容贴到下面

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.fourg</groupId><artifactId>testone</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><aliyun-spring-boot.version>1.0.0</aliyun-spring-boot.version><spring-boot.version>2.3.7.RELEASE</spring-boot.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>aliyun-redis-spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId><exclusions><exclusion><artifactId>jboss-logging</artifactId><groupId>org.jboss.logging</groupId></exclusion><exclusion><artifactId>hibernate-validator</artifactId><groupId>org.hibernate.validator</groupId></exclusion></exclusions></dependency><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.7</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!--druid数据库连接池--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.13</version></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-dependencies</artifactId><version>${spring-boot.version}</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>com.alibaba.cloud</groupId><artifactId>aliyun-spring-boot-dependencies</artifactId><version>${aliyun-spring-boot.version}</version><type>pom</type><scope>import</scope></dependency></dependencies></dependencyManagement><build><plugins><plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-compiler-plugin</artifactId><version>3.8.1</version><configuration><source>1.8</source><target>1.8</target><encoding>UTF-8</encoding></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.3.7.RELEASE</version><configuration><mainClass>com.fourg.testone.DemoApplication</mainClass></configuration><executions><execution><id>repackage</id><goals><goal>repackage</goal></goals></execution></executions></plugin></plugins></build></project>

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