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JdbcTemplate概述
它是spring框架中提供的一个对象，是对原始繁琐的JdbcAPI对象的简单封装。spring框架为我们提供了很多的操作模板类。例如:操作关系型数据的JdbcTemplate和MbernateTemplate，操作nosql数据库的RedisTemplate，操作消息队列的JmsTemplate等等。
JdbcTemplate开发步骤
① 导入spring-jdbc和spring-tx坐标
② 创建数据库表和实体
③ 创建JdbcTemplate对象
④ 执行数据库操作
@Test// 测试JdbcTemplate的开发步骤public void test2() throws PropertyVetoException {ApplicationContext app = new ClassPathXmlApplicationContext("applicationContext.xml");JdbcTemplate jdbcTemplate = app.getBean(JdbcTemplate.class);int row = jdbcTemplate.update("insert into account values(?, ?)", "lisi11", 1000);System.out.println(row);}//-----------------------------------------------------<?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"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"><!-- 加载jdbc.properties--><context:property-placeholder location="classpath:jdbc.properties"/><!-- 数据源对象--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${jdbc.driver}"/><property name="jdbcUrl" value="${jdbc.url}"/><property name="user" value="${jdbc.username}"/><property name="password" value="${jdbc.password}"/></bean><!-- jdbc模板对象--><bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate"><property name="dataSource" ref="dataSource"/></bean></beans>//----------------------------------------------jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=1234JdbcTemplate基本使用-常用操作-更新删除操作
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class JdbcTemplateCRUDTest {@Autowiredprivate JdbcTemplate jdbcTemplate;@Testpublic void testUpdate(){jdbcTemplate.update("update account set money = ? where name = ?",10001, "wangwu");}@Testpublic void testDelete(){jdbcTemplate.update("delete from account where money = ?", 10001);}
}JdbcTemplate基本使用-常用操作-查询操作
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class JdbcTemplateCRUDTest {@Autowiredprivate JdbcTemplate jdbcTemplate;@Testpublic void testUpdate(){jdbcTemplate.update("update account set money = ? where name = ?",10001, "wangwu");}@Testpublic void testDelete(){jdbcTemplate.update("delete from account where money = ?", 10001);}//查询多个@Testpublic void estQuery(){List<Account> accountList = jdbcTemplate.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));System.out.println(accountList);}//查询一个@Testpublic void testQueryOne(){List<Account> accountList = jdbcTemplate.query("select * from account where name=?", new BeanPropertyRowMapper<Account>(Account.class), "lisi");System.out.println(accountList);}//聚合查询@Testpublic void testQueryCount(){Long count = jdbcTemplate.queryForObject("select count(*) from account", Long.class);System.out.println(count);}
}