学习SpringAOP之如何用jdbcTemplate操作数据库_java 使用aop对数据库操作

首先进行xml文件的配置，包括开启组件扫描，配置数据库连接池和创建jdbcTemplate对象；

<?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:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
                        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd">
 
    <!--组件扫描-->
    <context:component-scan base-package="com.atguigu"></context:component-scan>
 
    <!-- 数据库连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          destroy-method="close">
        <property name="url" value="jdbc:mysql:///user_db" />
        <property name="username" value="root" />
        <property name="password" value="root" />
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
    </bean>
 
    <!-- 创建JdbcTemplate对象 -->
    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
        <!--注入dataSource-->
        <property name="dataSource" ref="dataSource"></property>
    </bean>
 
</beans>

        其中@Autowired属于Spring内置的注解，默认的注入方式为byType(根据类型进行匹配),也就是说会优先根据接口类型去匹配并注入Bean（接口的实现类）；但是，当一个接口存在多个类的话，byType这种方式就无法正常注入对象了，因为这个时候Spring会同时找到满足条件的选择，默认情况下它不知道自己选择哪一个。这种情况下，注入方式就会变为byName（根据名称进行匹配），这个名称通常就是类名（首字母小写）。

接下来是类BookService、接口BookDao和实现类BookDaoImpl:

BookService:

package com.atguigu.service;
 
import com.atguigu.dao.BookDao;
import com.atguigu.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import java.util.List;
 
@Service
public class BookService {
 
    //注入dao
    @Autowired
    private BookDao bookDao;
 
    //添加的方法
    public void addBook(Book book){
        bookDao.add(book);
    }
 
    //修改的方法
    public void updateBook(Book book){
        bookDao.updateBook(book);
    }
 
    //删除方法
    public void delete(Book book){
        bookDao.delete(book);
    }
 
    //查询表的记录数
    public int findCount(){
        return bookDao.selectCount();
    }
 
    //查询返回对象
    public Book fondOne(String id){
        return bookDao.findBookInfo(id);
    }
 
    //查询返回集合
    public List<Book> findAll(){
        return bookDao.findAllBook();
    }
 
    //批量添加
    public void batchAdd(List<Object[]> batchArgs){
        bookDao.batchAddBook(batchArgs);
    }
 
    //批量修改
    public void batchUpdateBook(List<Object[]> batchArgs){
        bookDao.batchUpdateBook(batchArgs);
    }
 
    //批量删除
    public void batchDelete(List<Object[]> batchArgs){
        bookDao.batchDelete(batchArgs);
    }
 
}

BookDao:

package com.atguigu.dao;
 
import com.atguigu.entity.Book;
 
import java.util.List;
 
public interface BookDao {
    //添加方法
    void add(Book book);
 
    //修改方法
    void updateBook(Book book);
 
    //删除方法
    void delete(Book book);
 
    //查询表的记录数
    int selectCount();
 
    //查询返回对象
    Book findBookInfo(String id);
 
    //查询返回集合
    List<Book> findAllBook();
 
    //批量添加
    void batchAddBook(List<Object[]> batchArgs);
 
    //批量修改
    void batchUpdateBook(List<Object[]> batchArgs);
 
    //批量删除
    void batchDelete(List<Object[]> batchArgs);
}

BookDaoImpl:

package com.atguigu.dao;
 
import com.atguigu.entity.Book;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;
 
import java.util.Arrays;
import java.util.List;
 
@Repository
public class BookDaoImpl implements BookDao{
 
    //注入JdbcTemplate
    @Autowired
    private JdbcTemplate jdbcTemplate;
 
    @Override
    public void add(Book book) {
        //1.创建sql语句
        String sql = "insert into t_book values(?,?,?)";
        //2.调用方法实现
        Object[] args = {book.getUserId(), book.getUsername(), book.getUstatus()};
        int update = jdbcTemplate.update(sql, args);
        System.out.println(update);
    }
 
    @Override
    public void updateBook(Book book) {
        String sql = "update t_book set username=?,ustatus=? where user_id=?";
        Object[] args = {book.getUsername(),book.getUstatus(),book.getUserId()};
        int update = jdbcTemplate.update(sql, args);
        System.out.println(update);
    }
 
    @Override
    public void delete(Book book) {
        String sql = "delete from t_book where user_id=?";
        int update = jdbcTemplate.update(sql, book.getUserId());
        System.out.println(update);
    }
 
    @Override
    public int selectCount() {
        String sql = "select COUNT(*) FROM t_book";
        return jdbcTemplate.queryForObject(sql,Integer.class);
    }
 
    @Override
    public Book findBookInfo(String id) {
        String sql = "select * from t_book where user_id=?";
        Book book = jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<Book>(Book.class), id);
        return book;
    }
 
    @Override
    public List<Book> findAllBook() {
        String sql = "select * from t_book";
        List<Book> bookList = jdbcTemplate.query(sql, new BeanPropertyRowMapper<Book>(Book.class));
        return bookList;
    }
 
    @Override
    public void batchAddBook(List<Object[]> batchArgs) {
        String sql = "insert into t_book values(?,?,?)";
        int[] ints = jdbcTemplate.batchUpdate(sql, batchArgs);
        System.out.println(Arrays.toString(ints));
    }
 
    @Override
    public void batchUpdateBook(List<Object[]> batchArgs) {
        String sql = "update t_book set username=?,ustatus=? where user_id=?";
        int[] ints = jdbcTemplate.batchUpdate(sql, batchArgs);
        System.out.println(Arrays.toString(ints));
    }
 
    @Override
    public void batchDelete(List<Object[]> batchArgs) {
        String sql = "delete from t_book where user_id = ?";
        int[] ints = jdbcTemplate.batchUpdate(sql, batchArgs);
        System.out.println(Arrays.toString(ints));
    }
}

最后进行测试：

package com.atguigu.test;
 
import com.atguigu.entity.Book;
import com.atguigu.service.BookService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
 
import java.util.ArrayList;
import java.util.List;
 
public class TestBook {
 
    @Test
    public void testJdbcTemplate(){
        ApplicationContext context = new ClassPathXmlApplicationContext("bean1.xml");
        BookService bookService = context.getBean("bookService", BookService.class);
 
        //添加
//        Book book = new Book();
//        book.setUserId("1");
//        book.setUsername("java");
//        book.setUstatus("a");
//        bookService.addBook(book);
//
//        Book book2 = new Book();
//        book2.setUserId("2");
//        book2.setUsername("pathon");
//        book2.setUstatus("b");
//        bookService.addBook(book2);
 
        //修改
//        Book book = new Book();
//        book.setUserId("1");
//        book.setUsername("javaupup");
//        book.setUstatus("atguigu");
//        bookService.updateBook(book);
 
        //删除
//        Book book = new Book();
//        book.setUserId("1");
//        bookService.delete(book);
 
//        System.out.println(bookService.findCount());
 
        //查询返回对象
//        Book book = bookService.fondOne("1");
//        System.out.println(book.toString());
 
        //查询返回集合
        List<Book> bookList = bookService.findAll();
        for (Book item : bookList){
            System.out.println(item);
        }
 
        //批量添加
//        List<Object[]> batchArgs = new ArrayList<>();
//        Object[] o1 = {"3","spring","study"};
//        Object[] o2 = {"4","springMVC","willStudy"};
//        Object[] o3 = {"5","myBatis","willStudy"};
//        batchArgs.add(o1);
//        batchArgs.add(o2);
//        batchArgs.add(o3);
//        bookService.batchAdd(batchArgs);
 
        //批量修改
//        List<Object[]> batchArgs = new ArrayList<>();
//        Object[] o1 = {"spring++","study++","3"};
//        Object[] o2 = {"springMVC++","willStudy","4"};
//        Object[] o3 = {"myBatis++","willStudy++","5"};
//        batchArgs.add(o1);
//        batchArgs.add(o2);
//        batchArgs.add(o3);
//        bookService.batchUpdateBook(batchArgs);
 
        //批量删除
//        List<Object[]> batchArgs = new ArrayList<>();
//        Object[] o1 = {"1"};
//        Object[] o2 = {"3"};
//        Object[] o3 = {"5"};
//        batchArgs.add(o1);
//        batchArgs.add(o2);
//        batchArgs.add(o3);
//        bookService.batchDelete(batchArgs);
 
    }
}