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This article mainly introduces SpringBoot how to use JdbcTemplate operation database related knowledge, detailed and easy to understand, simple and fast operation, has a certain reference value, I believe that everyone will have a harvest after reading this SpringBoot how to use JdbcTemplate operation database article, let's take a look at it.

JdbcTemplate is a JDBC template framework provided by Spring, which uses AOP technology to solve the problem of a large number of duplicate codes when using JDBC directly. Although not as flexible as MyBatis, it is much more convenient than using JDBC directly.

I. Creating tables

CREATE TABLE `t_demo` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `name` varchar(120) NOT NULL, `num` int(11) NOT NULL, `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY (`id`)) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8 COMMENT='demo table';

Second, add dependencies, configuration

First edit the pom.xml file and add dependencies.

org.springframework.boot spring-boot-starter-jdbc mysql mysql-connector-java com.alibaba druid 1.1.9

2. Write configuration

spring.datasource.type = com.alibaba.druid.pool.DruidDataSourcespring.datasource.url = jdbc:mysql://localhost:3306/PiaoDB? useUnicode=swater&characterEncoding=UTF-8spring.datasource.username = rootspring.datasource.password = rootspring.datasource.driver-class-name = com.mysql.jdbc.Driver

III. Writing code

1. Write entity class

@Data@Accessors(chain = true)public class Demo { private Integer id; private String name; private Integer num; private Date createTime;}

2. Write Dao code

@Repositorypublic class DemoDao { @Autowired private JdbcTemplate jdbcTemplate; //New data public int addDemo(Demo demo) { return jdbcTemplate.update("INSERT INTO t_demo(name, num) VALUE (?, ?) ", demo.getName(), demo.getNum()); } //modify data public int updateDemo(Demo demo) { return jdbcTemplate.update("UPDATE t_demo SET name=?, num=? WHERE id=? ", demo.getName(), demo.getNum(), demo.getId()); } //Delete data public int deleteDemoById(Integer id) { return jdbcTemplate.update("DELETE FROM t_demo WHERE id=? ", id); } //Get single data public Demo getDemoById(Integer id) { return jdbcTemplate.queryForObject("SELECT * FROM t_demo WHERE id=? ", new BeanPropertyRowMapper(Demo.class), id); } //Get multiple data public List getAllDemos() { return jdbcTemplate.query("SELECT * FROM t_demo", new BeanPropertyRowMapper(Demo.class)); }}

3. Write Controller Code

@RestController@RequestMapping("/demo")public class DemoController { @Autowired private DemoDao demoDao; @RequestMapping("") public void test(){ //New data int num = demoDao.addDemo(new Demo().setName("piao").setNum(20)); System.out.println("Insert a data: " + num); //modify data int num2 = demoDao.updateDemo(new Demo().setId(15).setName("piao").setNum(22)); System.out.println("Update a piece of data: " + num2); //Delete data int num3 = demoDao.deleteDemoById(13); System.out.println("Delete a piece of data: " + num3); //Query single data Demo demo = demoDao.getDemoById(15); System.out.println("Query 1 data: " + demo.toString()); //Query multiple data List demos = demoDao.getAllDemos(); System.out.println("Query multiple data: " + demos); }}

IV. Verification Results

About "SpringBoot how to use JdbcTemplate operation database" the content of this article is introduced here, thank you for reading! I believe everyone has a certain understanding of "SpringBoot how to use JdbcTemplate to operate database" knowledge, if you still want to learn more knowledge, welcome to pay attention to the industry information channel.

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