SpringCloud使用jpa之传统方式

不说废话，直接上代码：

pom.xml

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.shinho</groupId>
    <artifactId>dbmeta</artifactId>
    <version>0.0.1</version>
    <packaging>jar</packaging>

    <name>dbmeta</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.M9</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>4.3.14.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>0.2.9</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-ehcache</artifactId>
            <version>5.2.16.Final</version>
        </dependency>
        <dependency>
            <groupId>net.sf.ehcache</groupId>
            <artifactId>ehcache</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>  
            <groupId>log4j</groupId>  
            <artifactId>log4j</artifactId>  
            <version>1.2.17</version>  
        </dependency> 
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
    
    <repositories>
        <repository>
            <id>ali</id>
            <name>ali Repository</name>
            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>clojars</id>
            <name>Clojars repository</name>
            <url>https://clojars.org/repo</url>
        </repository>
    </repositories>

</project>

application.yml

eureka:
  client:
    serviceUrl:
      defaultZone: http://192.168.40.132:7087/eureka
server:
  port: 7088
  
spring:
  application:
    name: service-dbmeta
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://127.0.0.1:3306/shbi?characterEncoding=utf8
    username: root
    password: root
    driverClassName: com.mysql.jdbc.Driver
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 20
    filters: stat,wall,log4j
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
    useGlobalDataSourceStat: true
  jpa:
    database: MYSQL
    show-sql: false
    generate-ddl: true
    hibernate:
      ddl-auto: create
      naming_strategy: org.hibernate.cfg.ImprovedNamingStrategy
    properties:
      hibernate:
        dialect: org.hibernate.dialect.MySQL5Dialect
        cache: 
          region.factory_class: org.hibernate.cache.ehcache.EhCacheRegionFactory
          provider_configuration_file_resource_path: ehcache.xml

实体类Tables.java

package com.shinho.entity;

import java.io.Serializable;

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.hibernate.annotations.Cache;
import org.hibernate.annotations.CacheConcurrencyStrategy;

@Entity
@Table(name="tables",catalog = "shbi")
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class Tables implements Serializable{
    private static final long serialVersionUID = 1L;
    
    private int tableid;
    private String tablename;
    private int dbid;
    private String tabletext;
    
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "tableid", unique = true, nullable = false)
    public int getTableid() {
        return tableid;
    }
    
    public void setTableid(int tableid) {
        this.tableid = tableid;
    }
    
    @Column(name = "tablename", nullable = false)
    public String getTablename() {
        return tablename;
    }
    
    public void setTablename(String tablename) {
        this.tablename = tablename;
    }
    
    @Column(name = "dbid")
    public int getDbid() {
        return dbid;
    }
    
    public void setDbid(int dbid) {
        this.dbid = dbid;
    }
    
    @Column(name = "tabletext")
    public String getTabletext() {
        return tabletext;
    }
    
    public void setTabletext(String tabletext) {
        this.tabletext = tabletext;
    }
}

数据库访问层TablesDao.java

package com.shinho.dao;

import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.CrudRepository;

import com.shinho.entity.Tables;


public interface TablesDao extends CrudRepository<Tables, Integer> {
    
    @Query(value="select count(*) from props",nativeQuery=true)
    int getcount();
}

最后，执行类 DbmetaApplication.java

package com.shinho;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;

import com.shinho.dao.TablesDao;

@Configuration
@EnableAutoConfiguration
@ComponentScan(basePackages={"com.shinho"})
@EnableWebMvc
@EnableEurekaClient
@RestController
public class DbmetaApplication {
    
    private static final Logger logger = Logger.getLogger(DbmetaApplication.class);
    
    public static void main(String[] args) {
        SpringApplication.run(DbmetaApplication.class, args);
    }
    
    @Value("${server.port}")
    String port;
    
    @RequestMapping("/hi")
    @Bean
    public String home(TablesDao dao) {
        logger.info("测试");
        int ishas = dao.getcount();
        return ishas+"";
    }
}

补充说明：

1. 执行类上一定要加@EnableWebMvc，否则不好使。
2. hibernate-ehcache的版本一定要和jpa里面的hibernate里面的一致，可以看pom文件的Dependency Hierarchy里面的。
3. MySql里面Tables是个系统表，不要用这个名字。