吴裕雄--天生自然--Spring Boot--Spring Boot使用JdbcTemplate

2023-10-26 20:04:04

    JDBC模板（JdbcTemplate）是Spring对数据库的操作在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。

使用JdbcTemplate操作数据库。
具体实现步骤如下。
1．创建Spring Boot Web应用
2．修改pom.xml文件
3．设置Web应用ch6_5的上下文路径及数据源配置信息
4．创建实体类
5．创建数据访问层
6．创建业务层
7．创建控制器类MyUserController
8．运行

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.JDBC</groupId>
    <artifactId>SpringBootJdbcTemplate</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <!-- 声明项目配置依赖编码格式为 utf-8 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <fastjson.version>1.2.24</fastjson.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <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>
            <scope>runtime</scope>
            <version>8.0.13</version><!--$NO-MVN-MAN-VER$ -->
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        
        <!-- 添加jdbc依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

server.port=8089

server.servlet.context-path=/ch6_5
spring.datasource.url=jdbc:mysql://localhost:3306/springbootjpa?serverTimezone=UTC&autoReconnect=true
spring.datasource.username=root
spring.datasource.password=admin
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.jpa.database=MYSQL
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=update
spring.jackson.serialization.indent-output=true

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;
    }
}

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);
}

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);
    }

    @Override
    public List<MyUser> findAll() {
        String sql = "select * from user ";
        // 定义一个RowMapper
        RowMapper<MyUser> rowMapper = new BeanPropertyRowMapper<MyUser>(MyUser.class);
        return jdbcTemplate.query(sql, rowMapper);
    }

    @Override
    public MyUser findUserById(Integer id) {
        String sql = "select * from user where id = ? ";
        Object args[] = { id };
        // 定义一个RowMapper
        RowMapper<MyUser> rowMapper = new BeanPropertyRowMapper<MyUser>(MyUser.class);
        return jdbcTemplate.queryForObject(sql, args, rowMapper);
    }
}

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);
}

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) {
        return myUserRepository.saveUser(myUser);
    }

    @Override
    public int deleteUser(Integer id) {
        return myUserRepository.deleteUser(id);
    }

    @Override
    public int updateUser(MyUser myUser) {
        return myUserRepository.updateUser(myUser);
    }

    @Override
    public List<MyUser> findAll() {
        return myUserRepository.findAll();
    }

    @Override
    public MyUser findUserById(Integer id) {
        return myUserRepository.findUserById(id);
    }
}

package com.ch.ch6_5.controller;

import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.ch.ch6_5.entity.MyUser;
import com.ch.ch6_5.service.MyUserService;

@RestController
public class MyUserController {
    @Autowired
    private MyUserService myUserService;

    @RequestMapping("/saveUser")
    public int saveUser(MyUser myUser) {
        return myUserService.saveUser(myUser);
    }

    @RequestMapping("/deleteUser")
    public int deleteUser(Integer id) {
        return myUserService.deleteUser(id);
    }

    @RequestMapping("/updateUser")
    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);
    }
}

package com.ch.ch6_5;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Ch65Application {
    public static void main(String[] args) {
        SpringApplication.run(Ch65Application.class, args);
    }
}

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