Springboot整合jdbctemplate进行数据查询

1.项目结构

2.pom.xml和application.properties

pom.xml

<?xml version&＃61;"1.0" encoding&＃61;"UTF-8"?>
<project xmlns&＃61;"http://maven.apache.org/POM/4.0.0" xmlns:xsi&＃61;"http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation&＃61;"http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.1.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><name>demo</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><!-- devtools --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><!-- web --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- mysql --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!-- 数据源 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.21</version></dependency><!--jdbc --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><!-- test --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

application.properties

#jdbc连接
spring.datasource.url&＃61;jdbc:mysql://localhost:3306/springboottest?useUnicode&＃61;true&characterEncoding&＃61;utf8&serverTimezone&＃61;UTC
spring.datasource.username&＃61;root
spring.datasource.password&＃61;123456
spring.datasource.driver-class-name&＃61;com.mysql.cj.jdbc.Driver
#数据源
spring.datasource.type&＃61;com.alibaba.druid.pool.DruidDataSource
#tomcat端口
server.port&＃61;8888


3.UserController

package com.example.demo.controller;import java.util.HashMap;
import java.util.Map;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.example.demo.bean.User;
import com.example.demo.service.UserService;&＃64;Controller
&＃64;RequestMapping("user")
public class UserController {&＃64;Autowiredprivate UserService userService;&＃64;ResponseBody&＃64;RequestMapping("login")public Map<String,String> login(User user){HashMap<String, String> map &＃61; new HashMap<String,String>();try {User user2 &＃61; userService.findUser(user);if(null !&＃61;user2) {map.put("success", user2.getName()&＃43;":欢迎您登录成功");}else {map.put("success", "用户名和密码不正确");}} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();map.put("error", "程序出现异常");}return map;}
}

4.UserService

package com.example.demo.service;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import com.example.demo.bean.User;
import com.example.demo.dao.UserDao;&＃64;Service
public class UserService {&＃64;Autowiredprivate UserDao userDao;public User findUser(User user) {User user2 &＃61; userDao.findUser(user);return user2;}}

5.UserDao

package com.example.demo.dao;import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;import com.example.demo.bean.User;&＃64;Repository
public class UserDao {&＃64;Autowiredprivate JdbcTemplate jdbcTemplate;public User findUser(User user) {String sql&＃61;"select * from user where name&＃61;? and pass&＃61;?";RowMapper<User> mapper &＃61; BeanPropertyRowMapper.newInstance(User.class);ArrayList<Object> agrList &＃61; new ArrayList<Object>();agrList.add(user.getName());agrList.add(user.getPass());List<User> userList &＃61; jdbcTemplate.query(sql, mapper,agrList.toArray());return userList.get(0);}}

6.spring boot添加事务

在service的类上添加&＃64;Transactional&＃xff0c;表示这个类所有方法都添加事务。
在service的单个方法上添加&＃64;Transactional&＃xff0c;表明这个方法添加事务。

&＃64;Service
&＃64;Transactional
public class UserService {&＃64;Autowiredprivate UserDao userDao;public User findUser(User user) {User user2 &＃61; userDao.findUser(user);return user2;}&＃64;Transactionalpublic void addUser(User user) {userDao.addUser(user);System.out.println(1/0);userDao.addUser(user);}}