Java：SpringBoot整合JDBC实现对数据库的CURD增删改查-CFANZ编程社区

JDBC 是 Java数据库连接，是 Java Database Connectivity 的简称，是 Java 语言中用来规范客户端程序如何来访问数据库的应用程序接口，提供了诸如查询和更新数据库中数据的方法

完整代码：https://github.com/mouday/spring-boot-demo/SpringBoot-JDBC

引入依赖

jdbc依赖

<!--spring jdbc  Spring 持久化层支持jar包-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jdbc</artifactId>
</dependency>

<!-- MySQL驱动 -->
<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>1.2.15</version>
</dependency>

完整pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 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>2.7.7</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>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

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

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>

        <!--spring jdbc  Spring 持久化层支持jar包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>

        <!-- MySQL驱动 -->
        <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>1.2.15</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

创建数据表

CREATE TABLE `t_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(20) DEFAULT NULL COMMENT '姓名',
  `age` int(11) DEFAULT NULL COMMENT '年龄',
  `sex` varchar(2) DEFAULT NULL COMMENT '性别',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

实体类对象

package com.example.demo.entity;

import lombok.Data;

@Data
public class User {
    private Integer id;
    private String name;
    private Integer age;
    private String sex;
}

数据库配置

application.yml

# DataSource Config
spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://127.0.0.1:3306/data?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
    username: root
    password: 123456

CURD测试

package com.example.demo;

import com.example.demo.entity.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;

import java.util.List;

@SpringBootTest
class ApplicationTests {

    @Autowired
    private JdbcTemplate jdbcTemplate;

    /**
     * 添加数据
     */
    @Test
    void testAdd() {
        String sql = "insert into t_user (name, age, sex) values (?, ?, ?)";
        int update = jdbcTemplate.update(sql, "张三", 20, "男");
        System.out.println(update); // 1
    }

    /**
     * 更新数据
     */
    @Test
    void testUpdate() {
        String sql = "update t_user set name = ? where id = ?";
        int update = jdbcTemplate.update(sql, "李四", 1);
        System.out.println(update); // 1
    }

    /**
     * 删除数据
     */
    @Test
    void testDelete() {
        String sql = "delete from t_user where id = ?";
        int update = jdbcTemplate.update(sql, 1);
        System.out.println(update); // 1
    }

    /**
     * 查询单条数据
     */
    @Test
    void testSelectOne() {
        String sql = "select * from t_user where id = ?";
        User user = jdbcTemplate.queryForObject(
                sql,
                new BeanPropertyRowMapper<>(User.class),
                1);

        System.out.println(user);
        // User(id=1, name=张三, age=20, sex=男)
    }

    /**
     * 查询多条数据
     */
    @Test
    void testSelectList() {
        String sql = "select * from t_user where id = ?";
        List<User> user = jdbcTemplate.query(
                sql,
                new BeanPropertyRowMapper<>(User.class),
                1);

        System.out.println(user);
        // [User(id=1, name=张三, age=20, sex=男)]
    }

    /**
     * 查询单个数据
     */
    @Test
    void testSelectCount() {
        String sql = "select count(*) from t_user";
        Integer count = jdbcTemplate.queryForObject(sql, Integer.class);
        System.out.println(count);
        // 1
    }
}

参考文章

Spring Boot 集成 JDBC