<?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">

    <!--配置JdbcTemplate-->
    <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://127.0.0.1:3306/eesy?useSSL=false&amp;serverTimezone=GMT%2B8"></property>
        <property name="username" value="root"></property>
        <property name="password" value="nimahaoma49"></property>
    </bean>
</beans>

package com.itheima.jdbctemplate;

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 org.springframework.jdbc.datasource.DriverManagerDataSource;

import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

/**
 * JdbcTemplate的最基本用法
 */

public class JdbcTemplateDemo1 {

    public static void main(String[] args) {
        //1.获取容器
        ApplicationContext ac = new ClassPathXmlApplicationContext("bean.xml");
        //2.获取对象
        JdbcTemplate jt = (JdbcTemplate) ac.getBean("jdbcTemplate");

        //3.执行操作
        //保存
        jt.update("insert into account(name,money) values(?,?)","eee",3333f);
        //更新
        jt.update("update account set name=?,money=? where id=?","test",4567,7);
        //删除
        jt.update("delete from account where id=?",8);
        //查询所有
        //List<Account> accounts = jt.query("select * from account where money>?",new AccountRowMapper(),1000f);
        List<Account> accounts = jt.query(  //直接进行映射
                "select * from account where money>?",new BeanPropertyRowMapper<Account>(Account.class),1000f);
        for(Account account:accounts)
            System.out.println(account);
        //查询一个
        System.out.println(accounts.get(0));
        //查询返回一行一列(使用聚合函数，但不加group by子句)
        Long count = jt.queryForObject("select count(*) from account",Long.class);
        System.out.println(count);
    }
}

/**
 * 定义把结果集的元组封装成一个Account的封装策略
 */
class AccountRowMapper implements RowMapper<Account>{
    /**
     * 把结果集中的数据封装到Account中，然后由spring把每个Account加到集合中
     * @param resultSet
     * @param i
     * @return
     * @throws SQLException
     */
    @Override
    public Account mapRow(ResultSet resultSet, int i) throws SQLException {
        Account account = new Account();
        account.setId(resultSet.getInt("id"));
        account.setName(resultSet.getString("name"));
        account.setMoney(resultSet.getFloat("money"));
        return account;
    }
}