Spring：DataSource注入到dao

Spring：DataSource注入到dao

　　使用DOS命令创建数据库（Mysql）

1. 1. CREATE DATABASE book DEFAULT CHARACTER SET utf8;

      CREATE DATABASE book DEFAULT CHARACTER SET utf8;

   2. 使用该数据库

      use book

   3. 建表(name：书名；zuozhe：作者；cbs：出版社)

      create table myBook(
        name varchar(20),　　　　
        zuozhe varchar(20),
        cbs varchar(50)
      );
      

　　使用IDEA建立Maven项目，导入相关依赖

 <dependencies>
 2　         <!--Spring相关依赖-->
         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-context</artifactId>
             <version>4.3.13.RELEASE</version>
         </dependency>

         <dependency>
             <groupId>org.springframework</groupId>
             <artifactId>spring-jdbc</artifactId>
             <version>4.2.5.RELEASE</version>
         </dependency>
         <!--Mysql驱动-->
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <version>5.1.41</version>
         </dependency>

     </dependencies>

　　创建Spring的XML文件　:appSpring

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

 </beans>

　　创建entity类

 package entity;

 public class Book {
     private String name;        //书名
     private String zuozhe;      //作者
     private String cbs;         //出版社

     public Book(){

     }

     public Book(String name, String zuozhe, String cbs) {
         this.name = name;
         this.zuozhe = zuozhe;
         this.cbs = cbs;
     }

     public String getName() {
         return name;
     }

     public void setName(String name) {
         this.name = name;
     }

     public String getZuozhe() {
         return zuozhe;
     }

     public void setZuozhe(String zuozhe) {
         this.zuozhe = zuozhe;
     }

     public String getCbs() {
         return cbs;
     }

     public void setCbs(String cbs) {
         this.cbs = cbs;
     }

     @Override
     public String toString() {
         return "Book{" +
                 "name='" + name + '\'' +
                 ", zuozhe='" + zuozhe + '\'' +
                 ", cbs='" + cbs + '\'' +
                 '}';
     }
 }

　　创建dao接口

 package dao;

 import entity.Book;

 import java.util.List;

 public interface BookDao {
     void insert(Book book);
     List<Book> queryAll() ;
 }

　　实现dao接口：配置DataSource

1. 选择DriverManagerDataSource实现，此实现是没有连接池功能

2. 选择dbcp 里面的DataSource实现，这个有连接池功能

3. 选择c3p0里面的DataSource实现，这个有连接池功能

4. 选择Alibaba里面的实现，这个有连接池功能

 package dao;

 import entity.Book;

 import javax.sql.DataSource;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.SQLException;
 import java.util.List;

 public class BookDaoImpl implements BookDao {

     private DataSource dataSource;

     public void setDataSource(DataSource dataSource) {
         this.dataSource = dataSource;
     }

     public Connection getConnection()  {
         Connection connection = null;
         try {
             //获取连接对象、XML的配置信息
             connection = dataSource.getConnection();
         } catch (SQLException e) {
             e.printStackTrace();
         }
         return connection;
     }

     public void insert(Book book) {
         Connection connection = getConnection();
         String sql = "insert into myBook values(?,?,?)";
         try {
             PreparedStatement preparedStatement = connection.prepareStatement(sql);
             preparedStatement.setString(1,book.getName());
             preparedStatement.setString(2,book.getZuozhe());
             preparedStatement.setString(3,book.getCbs());
             preparedStatement.executeUpdate();
             System.out.println("成功添加一条数据");
             connection.close();
         } catch (SQLException e) {
             e.printStackTrace();
         }

     }

     public List<Book> queryAll() {
         return null;
     }
 }

　　编写service

 package service;

 import dao.StudentDao;
 import entity.Student;

 public class StudentService {
     private StudentDao studentDao;

     public StudentDao getStudentDao() {
         return studentDao;
     }

     public void setStudentDao(StudentDao studentDao) {
         this.studentDao = studentDao;
     }

     public  void insert(Student student){
         studentDao.insert(student);
     }
 }

　　在XML配置Mysql链接信息，把到dao和service注入Spring,让Spring管理

 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

     <!--Mysql配置信息-->
     <!--Spring提供的一个DataSource的实现:就是DriverManagerDataSource-->
     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
         <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
         <property name="url" value="jdbc:mysql://localhost:3306/book"/>
         <property name="username" value="root"/>
         <property name="password" value="888888"/>
     </bean>
     <!--依赖上面的dataSource-->
     <bean id="bookDao" class="dao.BookDaoImpl" >
         <property name="dataSource" ref="dataSource"></property>
     </bean>

     <bean id="bookService" class="service.BookService">
         <property name="bookDao" ref="bookDao"></property>
     </bean>
    <!-- <bean id="dao" class="dao.BookDaoImpl" autowire="byType" />
     <bean id="service" class="service.BookService" autowire="byType"/>-->

 </beans>

　　　Main测试

 package controller;

 import entity.Book;
 import org.springframework.context.ApplicationContext;
 import org.springframework.context.support.ClassPathXmlApplicationContext;
 import service.BookService;

 public class Main {
     public static void main(String[] args) {
         ApplicationContext applicationContext = new ClassPathXmlApplicationContext("appSpring.xml");
         BookService bookService = applicationContext.getBean("bookService",BookService.class);
         Book book = new Book("静待花开","王文韦","南方出版");
         bookService.insert(book);
         Book book2 = new Book("三国","罗贯中","中央出版");
         bookService.insert(book2);

     }
 }