Spring Boot 11-jdbcTemplate整合

jdbcTemplate 引入

        <!-- jdbctemplate -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <!-- mysql -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

配置数据源信息

spring.datasource.url=jdbc:mysql://XX.XXX.XXX.XX:3306/XXXX
spring.datasource.username=root
spring.datasource.password=XXXX
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

编写service

package com.tzp.jdbc.service;

import java.util.List;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl {
    @Autowired
    private JdbcTemplate jdbcTemplate;
    
    public List<Map<String, Object>> queryUsers(){
        List<Map<String, Object>> list = jdbcTemplate.queryForList(" select * from t_user ");
        return list;
    }
}

测试

package com.tzp.jdbc;

import java.util.List;
import java.util.Map;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import com.tzp.jdbc.service.UserServiceImpl;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootJdbcApplicationTests {

    @Autowired
    private UserServiceImpl impl;
    
    @Test
    public void contextLoads() {
        List<Map<String, Object>> list = impl.queryUsers();
        System.out.println(list.get(0).get("user_name"));
    }

}

测试结果

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.1.4.RELEASE)

2019-05-05 23:01:20.219  INFO 11236 --- [           main] c.t.jdbc.SpringbootJdbcApplicationTests  : Starting SpringbootJdbcApplicationTests on DESKTOP-J6HT18A with PID 11236 (started by tangzengping in D:\eclipse-workspace\springboot-workspace\springboot-jdbc)
2019-05-05 23:01:20.219  INFO 11236 --- [           main] c.t.jdbc.SpringbootJdbcApplicationTests  : No active profile set, falling back to default profiles: default
Loading class `com.mysql.jdbc.Driver'. This is deprecated. The new driver class is `com.mysql.cj.jdbc.Driver'. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
2019-05-05 23:01:24.356  INFO 11236 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2019-05-05 23:01:24.670  WARN 11236 --- [           main] ion$DefaultTemplateResolverConfiguration : Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
2019-05-05 23:01:25.623  INFO 11236 --- [           main] c.t.jdbc.SpringbootJdbcApplicationTests  : Started SpringbootJdbcApplicationTests in 5.845 seconds (JVM running for 8.654)
2019-05-05 23:01:26.398  INFO 11236 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2019-05-05 23:01:26.429  WARN 11236 --- [           main] com.zaxxer.hikari.util.DriverDataSource  : Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation.
2019-05-05 23:01:28.804  INFO 11236 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
张三
2019-05-05 23:01:28.965  INFO 11236 --- [       Thread-3] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2019-05-05 23:01:29.028  INFO 11236 --- [       Thread-3] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2019-05-05 23:01:29.075  INFO 11236 --- [       Thread-3] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.