SSM-Spring-19：Spring中JdbcTemplate

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Spring自带一个ORM持久化框架JdbcTemplate，他可以说是jdbc的加强版，但是对最细微的控制肯定做不到像jdbc那么细，那么性能高，他的出现是为了让jdbc更加便于使用

下面我说一下我这篇博客要干嘛，

一，简单的JdbcTemplate做出来的案例

二，除了自带的Spring-jdbc，补充c3p0,druid,dbcp三种DataSource数据源

1.案例查询图书

　　1.1数据表：

　　接下来就是java程序开发工具idea做的事了

　　1.2引入依赖jar包：

　　　　以前的jar包外，还需要spring-jdbc和jdbc的mysql的jar

        <!--spring jdbc-->

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-jdbc</artifactId>

            <version>4.3..RELEASE</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>5.1.</version>

        </dependency>

　　1.3分层开发开始，先是entity实体类层

　　　　Book

package cn.dawn.day21jdbctemplate.entity;

public class Book {

    private Integer bookID;

    private String bookName;

    private String bookAuthor;

    private Integer bookPrice;

    @Override

    public String toString() {

        return "Book{" +

                "bookID=" + bookID +

                ", bookName='" + bookName + '\'' +

                ", bookAuthor='" + bookAuthor + '\'' +

                ", bookPrice=" + bookPrice +

                '}';

    }

    public Book() {

    }

    public Integer getBookID() {

        return this.bookID;

    }

    public void setBookID(Integer bookID) {

        this.bookID = bookID;

    }

    public String getBookName() {

        return this.bookName;

    }

    public void setBookName(String bookName) {

        this.bookName = bookName;

    }

    public String getBookAuthor() {

        return this.bookAuthor;

    }

    public void setBookAuthor(String bookAuthor) {

        this.bookAuthor = bookAuthor;

    }

    public Integer getBookPrice() {

        return this.bookPrice;

    }

    public void setBookPrice(Integer bookPrice) {

        this.bookPrice = bookPrice;

    }

}

　　1.3dao层

　　　　一个接口IBookDAO

package cn.dawn.day21jdbctemplate.dao;

import cn.dawn.day21jdbctemplate.entity.Book;

import java.util.List;

/**

 * Created by Dawn on 2018/3/13.

 */

public interface IBookDAO {

    public List<Book> findAllBooks();

}

　　　　它的实现类BookDAOImpl

package cn.dawn.day21jdbctemplate.dao;

import cn.dawn.day21jdbctemplate.entity.Book;

import org.springframework.jdbc.core.RowMapper;

import org.springframework.jdbc.core.support.JdbcDaoSupport;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.List;

/**

 * Created by Dawn on 2018/3/13.

 */

public class BookDAOImpl extends JdbcDaoSupport implements IBookDAO {

    public List<Book> findAllBooks() {

        String sql="select * from book";

        List<Book> lists = this.getJdbcTemplate().query(sql, new RowMapper<Book>() {

            public Book mapRow(ResultSet rs, int i) throws SQLException {

                Book book=new Book();

                book.setBookAuthor(rs.getString("bookAuthor"));

                book.setBookID(rs.getInt("bookId"));

                book.setBookName(rs.getString("bookName"));

                book.setBookPrice(rs.getInt("bookPrice"));

                return book;

            }

        });

        return lists;

    }

}

　　　　这儿有几点要说的，他实现了JdbcTemplate，是为了一会给这个类注入数据源等操作，子类继承了父类的方法属性，所以这个类才能和数据库打交道

　　　　ResultSet就是数据库的单行记录，i就是此单行记录是符合你查出来的中的第几条，先把案例配通

　　1.4service层

　　　　一个接口IBookService

package cn.dawn.day21jdbctemplate.service;

import cn.dawn.day21jdbctemplate.entity.Book;

import java.util.List;

/**

 * Created by Dawn on 2018/3/13.

 */

public interface IBookService {

    public List<Book> findAllBooks();

}

　　　　它的实现类BookService

package cn.dawn.day21jdbctemplate.service;

import cn.dawn.day21jdbctemplate.dao.IBookDAO;

import cn.dawn.day21jdbctemplate.entity.Book;

import java.util.List;

/**

 * Created by Dawn on 2018/3/13.

 */

public class BookServiceImpl implements IBookService{

    private IBookDAO dao;

    public List<Book> findAllBooks() {

        return dao.findAllBooks();

    }

    public IBookDAO getDao() {

        return dao;

    }

    public void setDao(IBookDAO dao) {

        this.dao = dao;

    }

}

　　　　dao层的接口声明成成员变量，并且提供get/set方法，一会要注入进来dao层的实现

　　1.5我做了个一步到位的操作，将Driver,url,username,pwd这些jdbc连接数据库的条件提到了propertiess文件中

　　　　jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql:///s2228

jdbc.username=root

jdbc.password=

　　1.6就是书写大配置文件了

　　　　起名随意，一会单测方法中能合的上就行，以.xml结尾

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

       xmlns:aop="http://www.springframework.org/schema/aop"

       xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

       http://www.springframework.org/schema/beans/spring-beans.xsd

       http://www.springframework.org/schema/aop

       http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--配置jdbc。properties-->

    <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>

    <!--自带的持久化框架的数据源-->

    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">

        <property name="driverClassName" value="${jdbc.driver}"></property>

        <property name="url" value="${jdbc.url}"></property>

        <property name="username" value="${jdbc.username}"></property>

        <property name="password" value="${jdbc.password}"></property>

    </bean>

    <!--配置jdbctemplate-->

    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

        <property name="dataSource" ref="dataSource"></property>

    </bean>

    <!--dao-->

    <bean id="bookDao" class="cn.dawn.day21jdbctemplate.dao.BookDAOImpl">

        <property name="jdbcTemplate" ref="jdbcTemplate"></property>

    </bean>

    <!--service-->

    <bean id="bookService" class="cn.dawn.day21jdbctemplate.service.BookServiceImpl">

        <property name="dao" ref="bookDao"></property>

    </bean>

</beans>

　　1.7书写测试方法

package cn.dawn.day21JdbcTemplate;

import cn.dawn.day21jdbctemplate.entity.Book;

import cn.dawn.day21jdbctemplate.service.IBookService;

import org.junit.Test;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

/**

 * Created by Dawn on 2018/3/3.

 */

public class test20180313 {

    @Test

    /*aop代理工厂bean异常增强*/

    public void t01(){

        ApplicationContext context=new ClassPathXmlApplicationContext("ApplicationContext-day21JdbcTemplate.xml");

        IBookService service = (IBookService) context.getBean("bookService");

        List<Book> allBooks = service.findAllBooks();

        for (Book item:allBooks) {

            System.out.println(item);

        }

    }

}

案例完

下面说说另外三种数据源的配置，不同公司使用的不是完全一样，所以我提及几种，使用方法，在上方的案例中只要引入jar包，把xml中dateSource那个bean替换掉就好

　　1.dbcp

　　　　1.1引入jar包

        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->

        <dependency>

            <groupId>org.apache.commons</groupId>

            <artifactId>commons-dbcp2</artifactId>

            <version>2.1.</version>

        </dependency>

　　　　1.2xml文件中的dataSource

    <bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource">

        <property name="driverClassName" value="${jdbc.driver}"></property>

        <property name="url" value="${jdbc.url}"></property>

        <property name="username" value="${jdbc.username}"></property>

        <property name="password" value="${jdbc.password}"></property>

    </bean>

　　2.c3p0

　　　　2.1jar包

        <!-- https://mvnrepository.com/artifact/c3p0/c3p0 -->

        <dependency>

            <groupId>c3p0</groupId>

            <artifactId>c3p0</artifactId>

            <version>0.9.1.2</version>

        </dependency>

　　　　2.2xml中

     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

        <property name="driverClass" value="${jdbc.driver}"></property>

        <property name="jdbcUrl" value="${jdbc.url}"></property>

        <property name="user" value="${jdbc.username}"></property>

        <property name="password" value="${jdbc.password}"></property>

    </bean>

　　3.druid　　这个是中国阿里巴巴开发的

　　　　3.1jar包

        <!-- https://mvnrepository.com/artifact/com.alibaba/druid -->

        <dependency>

            <groupId>com.alibaba</groupId>

            <artifactId>druid</artifactId>

            <version>1.1.</version>

        </dependency>

　　　　3.2xml文件中

    <!--阿里的Druid-->

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">

        <property name="driverClassName" value="${jdbc.driver}"></property>

        <property name="url" value="${jdbc.url}"></property>

        <property name="username" value="${jdbc.username}"></property>

        <property name="password" value="${jdbc.password}"></property>

    </bean>

巴特西

SSM-Spring-19：Spring中JdbcTemplate

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