Spring_data_jpa以及Hibernate简单使用

    <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-jpa</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.4.0.Final</version>
        </dependency>

package the_template_data_jpa;

public class Book {
    private int id;
    private String bookname;
    private float price;

    public Book(int id, String bookname, float price) {
        this.id = id;
        this.bookname = bookname;
        this.price = price;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getBookname() {
        return bookname;
    }

    public void setBookname(String bookname) {
        this.bookname = bookname;
    }

    public float getPrice() {
        return price;
    }

    public void setPrice(float price) {
        this.price = price;
    }

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", bookname=‘" + bookname + ‘\‘‘ +
                ", price=" + price +
                ‘}‘;
    }
}

package the_template_data_jpa;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcOperations;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.support.TransactionTemplate;

import java.util.List;
import java.util.Map;

@Repository
public class BookDAO {
    @Autowired
    private JdbcOperations jdbcOperations;


    public List<Map<String, Object>> getToList() {
        List<Map<String, Object>> maps = jdbcOperations.queryForList("select * from book where id > 0");
        return maps;
    }

    public Map<String, Object> getToMap() {
        String sql = "select * from book where id > ?;";
        Map<String, Object> ret = jdbcOperations.queryForMap(sql,2);
        return ret;
    }

    public Book getToBook() {
        String sql = "select * from book where id > 2;";
        Book book = jdbcOperations.queryForObject(
                sql, (rs, rowNum) -> new Book(rs.getInt(1), rs.getString(2), rs.getFloat(3))
        );
        return book;
    }

    public void create(String bookname, int price) {
        String sql = " insert into book (bookname,price) values (?,?)";
        int javaWeb = jdbcOperations.update(sql, bookname, price);
        if (javaWeb > 0) {
            System.out.println("数据插入成功");
        }
    }


}

package the_template_data_jpa;


import com.mchange.v2.c3p0.ComboPooledDataSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.sql.DataSource;
import java.beans.PropertyVetoException;

@Configuration
public class JDBCTemplateConfig {

    @Bean
    DataSource dataSource (Environment env) throws PropertyVetoException {
        ComboPooledDataSource dataSource = new ComboPooledDataSource();
        dataSource.setDriverClass(env.getProperty("jdbc.driver"));
        dataSource.setJdbcUrl(env.getProperty("jdbc.url"));
        dataSource.setUser(env.getProperty("jdbc.user"));
        dataSource.setPassword(env.getProperty("jdbc.password"));

        return dataSource;
    }

    @Bean
    JdbcTemplate jdbcTemplate (DataSource dataSource){
        return new JdbcTemplate(dataSource);
    }

}

package the_template_data_jpa;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;

@Configuration //声明当前配置类
@ComponentScan(basePackages = "the_template_data_jpa") // 扫描当前包 使用 spring 注解
@PropertySource("classpath:application.properties")//加载 资源文件
@Import({JDBCTemplateConfig.class})//扫描 使用 jpa 注解的接口
public class SpringConfig {
}

package the_template_data_jpa;

        import org.springframework.context.annotation.AnnotationConfigApplicationContext;

        import java.util.List;
        import java.util.Map;

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext Ioc = new AnnotationConfigApplicationContext(SpringConfig.class);
        BookDAO bean = Ioc.getBean(BookDAO.class);
        List<Map<String, Object>> toList = bean.getToList();
        System.out.println(toList);
        
    }
}