Spring JdbcTemplate
Spring JdbcTemplate基本使用
JdbcTemplate概述
它是spring框架中提供的一个对象,是对原始繁琐的Jdbc API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 HibernateTemplate,操作nosql数据库的 RedisTemplate,操作消息队列的JmsTemplate等等。
JdbcTemplate开发步骤
- 导入spring-jdbc和spring-tx坐标
- 创建数据库表和实体
- 创建JdbcTemplate对象
- 执行数据库操作
JdbcTemplate快速入门
导坐标
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.0.5.RELEASE</version>
</dependency>
创建accout表和Accout实体
![061](/i/l/?n=22&i=blog/2258925/202210/2258925-20221028215713139-2103878271.png)
package com.kiang.domain;
public class Account {
private String name;
private double money;
//省略一堆get set to
}
创建JdbcTemplate对象 & 执行数据库操作
package com.kiang.test;
public class JdbcTemplateTest {
@Test
public void test1() throws PropertyVetoException {
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql://localhost:3306/testjdbc?serverTimezone=UTC");
dataSource.setUser("root");
dataSource.setPassword("102576");
JdbcTemplate jdbcTemplate = new JdbcTemplate();
jdbcTemplate.setDataSource(dataSource);
int row = jdbcTemplate.update("insert into account values (?,?)","zhangsan",8000);
System.out.println(row);
}
}
Tips:
- .setJdbcUrl() 记得加 ?serverTimezone=UTC 参数
- 提示无法解析 table 'account' 可以在IDEA里连一下数据库
Spring产生JdbcTemplate对象
我们可以将JdbcTemplate的创建权交给Spring,将数据源DataSource的创建权也交给Spring,在Spring容器内部将数据源DataSource注入到JdbcTemplate模版对象中。
抽取jdbc.properties:
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/testjdbc?serverTimezone=UTC
jdbc.username=root
jdbc.password=102576
applicationContext.xml配置如下:
<?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.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:jdbc.properties"/>
<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>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"/>
</bean>
</beans>
从容器中获得JdbcTemplate进行添加操作:
@Test
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 (?,?)","lisi",9000);
System.out.println(row);
}
JdbcTemplate的常用操作
修改操作
package com.kiang.test;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class JdbcTemplateCRUDTest {
@Autowired
private JdbcTemplate jdbcTemplate;
@Test
public void testUpdate() {
jdbcTemplate.update("update account set money=? where name=?",10000,"lisi");
}
}
删除和查询全部操作
@Test
public void testDelete() {
jdbcTemplate.update("delete from account where name=?","lisi");
}
@Test
public void testQueryAll() {
List<Account> accountList = jdbcTemplate.query("select * from account", new BeanPropertyRowMapper<Account>(Account.class));
System.out.println(accountList);
}
查询单个数据操作操作
@Test
public void testQueryOne() {
Account zhangsan = jdbcTemplate.queryForObject("select * from account where name=?", new BeanPropertyRowMapper<Account>(Account.class), "zhangsan");
System.out.println(zhangsan);
}
查询计算
@Test
public void testQueryCount() {
Long aLong = jdbcTemplate.queryForObject("select count(*) from account", Long.class);
System.out.println(aLong);
}
标签:account,jdbc,Spring,class,JdbcTemplate,public,jdbcTemplate
From: https://www.cnblogs.com/AncilunKiang/p/16837666.html