Spring Data JDBC全解析

jdbc
├─ JdbcApplication.java  // main方法
├─ config
│    └─ DataSourceConfig.java // 配置数据源，采用druid
├─ controller
│    └─ UserController.java // controler
├─ model
│    └─ User.java  // 实体类
├─ repository   // dao层，与数据库连接层
│    ├─ UserCrudRepository.java
│    └─ UserPageRepository.java
├─ service    // 服务层
│    └─ UserService.java
└─ util

      <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <!-- alibaba  druid数据源-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.18</version>
        </dependency>
           <!--spring-data-jdbc-->
      <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>

server.port=8002
spring.datasource.url=jdbc:mysql://192.168.31.166:3306/my_shop?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

package org.spring.data.jdbc.config;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jdbc.repository.config.AbstractJdbcConfiguration;
import org.springframework.data.jdbc.repository.config.EnableJdbcRepositories;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcOperations;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.TransactionManager;
import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;
@Configuration
@EnableJdbcRepositories(basePackages = "org.spring.data.jdbc")
public class DataSourceConfig extends AbstractJdbcConfiguration {
    /**
     * 采用阿里数据源druid
     *
     * @return
     */
    @ConfigurationProperties("spring.datasource")
    @Bean
    DataSource dataSource() {
        return new DruidDataSource();
    }
    /**
     *  Jdbc Template
     * @param dataSource
     * @return
     */
    @Bean
    NamedParameterJdbcOperations namedParameterJdbcOperations(DataSource dataSource) {
        return new NamedParameterJdbcTemplate(dataSource);
    }
    /**
     *  事务管理器
     * @param dataSource
     * @return
     */
    @Bean
    TransactionManager transactionManager(DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

 //配置Druid监控
    //admin后台, 访问地址: localhost:8002/druid/
    @Bean
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");
        Map<String, String> initParams = new HashMap<>();
        initParams.put("loginUsername", "admin");
        initParams.put("loginPassword", "admin");
        initParams.put("allow", "localhost");
        initParams.put("deny", "0.0.0.0");
        bean.setInitParameters(initParams);
        return bean;
    }
    //filter
    @Bean
    public FilterRegistrationBean webStatFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());
        Map<String, String> initParams = new HashMap<>();
        initParams.put("exclusions", "*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        bean.setUrlPatterns(Arrays.asList("/*"));
        return bean;
    }

<S extends T> Iterable<S> saveAll(Iterable<S> entities);
Optional<T> findById(ID id);
boolean existsById(ID id);
Iterable<T> findAll();
Iterable<T> findAllById(Iterable<ID> ids);
long count();
void deleteById(ID id);
void delete(T entity);
void deleteAllById(Iterable< extends ID> ids);
void deleteAll(Iterable< extends T> entities);
void deleteAll();

@Repository
public interface UserCrudRepository extends CrudRepository<User, String> {
    User findUserById(Integer id);
    @Query("select user_name as userName from sys_user where id = :id")
    String findUserNameById(@Param("id") Integer id);
}

package org.spring.data.jdbc.repository;
import org.spring.data.jdbc.model.User;
import org.springframework.data.repository.PagingAndSortingRepository;
public interface UserPageRepository extends PagingAndSortingRepository<User,String> {
    //按照id排序
}

   /**
     * 按照指定字段排序，可以指定升序、降,0升序，1降序
     *
     * @param sortField 按照指定字段排序
     * @param sortRule  排序规则
     * @return
     */
    public List<User> findUserBySort(String sortField, Integer sortRule) {
        List<User> results = new ArrayList<>();
        Iterable<User> userIterable = userPageRepository.findAll(Sort.by(sortRule == 0 ? Sort.Direction.ASC : Sort.Direction.DESC, sortField));
        Iterator<User> userIterator = userIterable.iterator();
        while (userIterator.hasNext()) {
            results.add(userIterator.next());
        }
        return results;
    }

   public List<User> findUserByPage(Pageable page) {
        return userPageRepository.findAll(page).getContent();
    }

    /**
     * find all user by page
     */
    @GetMapping("/findAllUser/by/page")
    @ResponseBody
    public List<User> findAllUserBySort(Pageable pageable) {
        return userService.findUserByPage(pageable);
    }