实际开发中Dao层使用JdbcTemplate

实体类

package com.itheima.domain;import java.io.Serializable;/** * @Author: lijiahao * @Description: 账户的实体类 * @Data: Create in 1:32 2020/2/9 * @Modified By: */public class Account implements Serializable {    private Integer id;    private String name;    private Float money;    @Override    public String toString() {        return "account{" +                "id=" + id +                ", name='" + name + '\'' +                ", money=" + money +                '}';    }    public Integer getId() {        return id;    }    public void setId(Integer id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Float getMoney() {        return money;    }    public void setMoney(Float money) {        this.money = money;    }}Dao接口

package com.itheima.Dao;import com.itheima.domain.Account;/** * @Author: lijiahao * @Description: 帐户的持久性接口 * @Data: Create in 2:30 2020/2/9 * @Modified By: */public interface IAccountDao {    /**     * @Author Lijiahao     * @Description 根据id查帐户     * @Date 2:31 2020/2/9     * @Param [id]     * @return com.itheima.domain.Account     **/    Account findAccountById(Integer id);    //根据名字查帐户    Account findAccountByName(String name);    //更新帐户    void updateAccount(Account account);}Dao具体实现类

package com.itheima.Dao.impl;import com.itheima.Dao.IAccountDao;import com.itheima.domain.Account;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import java.util.List;/** * @Author: lijiahao * @Description: * @Data: Create in 2:32 2020/2/9 * @Modified By: */public class AccountDaoImpl implements IAccountDao {    private JdbcTemplate jdbcTemplate;    public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {        this.jdbcTemplate = jdbcTemplate;    }    public Account findAccountById(Integer id) {        List<Account> accountList = jdbcTemplate.query("select * from account where id = ?", new BeanPropertyRowMapper<Account>(Account.class),id);        return accountList.isEmpty()?null:accountList.get(0);    }    public Account findAccountByName(String name) {        List<Account> accountList = jdbcTemplate.query("select * from account where name = ?", new BeanPropertyRowMapper<Account>(Account.class),name);        if(accountList.isEmpty()){            return null;        }        if(accountList.size()>1){            throw new RuntimeException("结果集不唯一");        }        return accountList.get(0);    }    public void updateAccount(Account account) {        jdbcTemplate.update("update account set name=? ,money=? where id = ?", account.getName(),account.getMoney(),account.getId());    }}测试

package com.itheima.jdbctemplate;import com.itheima.Dao.IAccountDao;import com.itheima.domain.Account;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;/** * @Author: lijiahao * @Description: jdbctemplate的最基本用法：CRUD * @Data: Create in 1:34 2020/2/9 * @Modified By: */public class JdbcTemplateDemo4 {    public static void main(String[] args) {        //1.获取容器        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");        //2.获取对象        IAccountDao accountDao = (IAccountDao) applicationContext.getBean("accountDao");        Account account = accountDao.findAccountById(1);        System.out.println(account);        account.setMoney(10000f);        accountDao.updateAccount(account);    }}配置文件

<?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        https://www.springframework.org/schema/beans/spring-beans.xsd">    <!--配置账户的持久层-->    <bean id="accountDao" class="com.itheima.Dao.impl.AccountDaoImpl">        <property name="jdbcTemplate" ref="jdbcTemplate"></property>    </bean>    <!--配置JdbTemplate-->    <bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">        <property name="dataSource" ref="dataSource"></property>    </bean>    <!--配置数据源-->    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>        <property name="url" value="jdbc:mysql://localhost:3306/eesy?serverTimezone=Asia/Shanghai&amp;characterEncoding=utf8&amp;useSSL=false"></property>        <property name="username" value="root"></property>        <property name="password" value="123456"></property>    </bean></beans>

来源：https://www.cnblogs.com/lijiahaoAA/p/12286069.html