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;
- }
- }
JdbcTemplate 测试类
- 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 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 JdbcTemplateDemo3 {
- public static void main(String[] args) {
- //1. 获取容器
- ApplicationContext applicationContext = new ClassPathXmlApplicationContext("bean.xml");
- //2. 获取对象
- JdbcTemplate jt = (JdbcTemplate) applicationContext.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",1523f,7);
- // 删除
- jt.update("delete from account where id=?", 8);
- // 查询所有
- //List<Account> accountList = jt.query("select * from account where money> ?",new AccountRowMapper() , 1000f);
- List<Account> accountList = jt.query("select * from account where money> ?",new BeanPropertyRowMapper<Account>(Account.class), 1000f);
- for(Account account : accountList){
- //System.out.println(account);
- }
- // 查询一个
- List<Account> accountList1 = jt.query("select * from account where id = ?",new BeanPropertyRowMapper<Account>(Account.class), 1);
- System.out.println(accountList1.isEmpty()?"没有内容":accountList1.get(0));
- // 查询返回一行一列 (使用聚合函数, 但不使用 group by 子句)
- Long count = jt.queryForObject("select count(*) from account where money> ?",Long.class, 1000f);
- System.out.println(count);
- }
- }
- // 定义 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
- public Account mapRow(ResultSet resultSet, int rowNum) throws SQLException {
- Account account = new Account();
- account.setId(resultSet.getInt("id"));
- account.setMoney(resultSet.getFloat("money"));
- account.setName(resultSet.getString("name"));
- return account;
- }
- }
配置文件 bean.xml
- <?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 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&characterEncoding=utf8&useSSL=false"></property>
- <property name="username" value="root"></property>
- <property name="password" value="123456"></property>
- </bean>
- </beans>
来源: http://www.bubuko.com/infodetail-3412572.html