SpringBoot用JdbcTemplates操作Mysql实例代码详解

目录

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JDBC模板是Spring对数据库的操作再JDBC基础上做了封装,建立了一个JDBC存取框架,在Spring Boot应用中,如果使用JdbcTemplate操作数据库,那么只需要在pom.xml文件中添加spring-boot-starter-jdbc模块,即可通过@Autowired注解依赖注入JdbcTemplate对象,然后调用JdbcTemplate提供的方法操作数据库

下面通过实例讲解如何在Spring Boot应用中使用JdbcTemplate操作数据库

1、创建Spring Boot Web应用

此处不再赘述 详情可参考我这篇

2、修改pom.xml文件

在文件中添加MYSQL连接器和spring-boot-starter-jdbc模块 具体代码如下

<?xml version="1.0" encoding="UTF-8"?>
-<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://maven.apache.org/POM/4.0.0">
<modelVersion>4.0.0</modelVersion>
-<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.7.RELEASE</version>
<relativePath/>
<!-- lookup parent from repository -->
</parent>
<groupId>com.ch</groupId>
<artifactId>ch6_5</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>ch6_5</name>
<description>Demo project for Spring Boot</description>
-<properties>
<java.version>11</java.version>
</properties>
-<dependencies>
-<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 添加MySQL依赖 -->
-<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.45</version>
<!-- MySQL8.x时,请使用8.x的连接器 -->
</dependency>
<!-- 添加jdbc依赖 -->
-<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
-<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
-<build>
-<plugins>
-<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

3、设置Web应用的上下文路径以及数据源配置信息

在application.properties文件中配置如下内容

server.servlet.context-path=/ch6_5#####数据源信息配置####数据库地址spring.datasource.url=jdbc:mysql://localhost:3306/springbootjpa?characterEncoding=utf8#数据库MySQL为8.x时,url为jdbc:mysql://localhost:3306/springbootjpa?useSSL=false&serverTimezone=Asia/Beijing&characterEncoding=utf-8#数据库用户名spring.datasource.username=root#数据库密码spring.datasource.password=root#数据库驱动spring.datasource.driver-class-name=com.mysql.jdbc.Driver#数据库MySQL为8.x时,驱动类为com.mysql.cj.jdbc.Driverspring.jackson.serialization.indent-output=true  #让控制器输出的JSON字符串格式更美观

4、创建实体类

创建名为com.ch.ch6_5.entity的包 并在该包中出啊关键MyUser实体类 代码如下

package com.ch.ch6_5.entity;
public class MyUser {
	private Integer id;
	private String username;
	private String password;
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
}

5、创建数据访问层

创建名为com.ch.ch6_5.repository的包 并创建接口和其实现类

接口代码如下

package com.ch.ch6_5.repository;
import java.util.List;
import com.ch.ch6_5.entity.MyUser;
public interface MyUserRepository {
	public int saveUser(MyUser myUser);
	public int deleteUser(Integer id);
	public int updateUser(MyUser myUser);
	public List<MyUser> findAll();
	public MyUser findUserById(Integer id);
}

实现类代码如下

package com.ch.ch6_5.repository;
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.ch.ch6_5.entity.MyUser;
@Repository
public class MyUserRepositoryImpl implements MyUserRepository{
	@Autowired
	private JdbcTemplate jdbcTemplate;
	@Override
	public int saveUser(MyUser myUser) {
		String sql = "insert into user (username, password) values (?,?)";
		Object args[] = {
				myUser.getUsername(),
				myUser.getPassword()
		};
		return jdbcTemplate.update(sql, args);
	}
	@Override
	public int deleteUser(Integer id) {
		String sql = "delete from user where id = ? ";
		Object args[] = {
				id
		};
		return jdbcTemplate.update(sql, args);
	}
	@Override
	public int updateUser(MyUser myUser) {
		String sql = "update user set username = ?, password = ? where id = ? ";
		Object args[] = {
				myUser.getUsername(),
				myUser.getPassword(),
				myUser.getId()
		};
		return jdbcTemplate.update(sql, args);

6、创建业务层

创建名为com.ch.ch6_5.service的包 并创建接口和实现类

接口代码如下

package com.ch.ch6_5.service;
import java.util.List;
import com.ch.ch6_5.entity.MyUser;
public interface MyUserService {
	public int saveUser(MyUser myUser);
	public int deleteUser(Integer id);
	public int updateUser(MyUser myUser);
	public List<MyUser> findAll();
	public MyUser findUserById(Integer id);
}

实现类代码如下

package com.ch.ch6_5.service;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.ch.ch6_5.entity.MyUser;
import com.ch.ch6_5.repository.MyUserRepository;
@Service
public class MyUserServiceImpl implements MyUserService{
	@Autowired
	private MyUserRepository myUserRepository;
	@Override
	public int saveUser(MyUser myUser) {
 
	public List<MyUser> findAll() {
		return myUserRepository.findAll();
	}
	@Override
	public MyUser findUserById(Integer id) {
		return myUserRepository.findUserById(id);
	}
}

7、创建控制器类

创建名为com.ch.ch6_5.controller的包 并创建MyUserController控制器类

代码如下

package com.ch.ch6_5.controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
im
	public int updateUser(MyUser myUser) {
		return myUserService.updateUser(myUser);
	}
	@RequestMapping("/findAll")
	public List<MyUser> findAll(){
		return myUserService.findAll();
	}
	@RequestMapping("/findUserById")
	public MyUser findUserById(Integer id) {
		return myUserService.findUserById(id);
	}
}

接下来运行Ch65Application主类然后访问即可

原文地址:https://blog.csdn.net/jiebaoshayebuhui/article/details/127512849
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