JAVA增删改查实践小项目(SpringBoot)_java增删改查入门小项目

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前言

基于SpringBoot的增删改查的小项目。

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一、数据库建表

CREATE TABLE `staff` (
  `s_id` int(5) NOT NULL AUTO_INCREMENT COMMENT '员工主键',
  `s_name` varchar(10) DEFAULT NULL COMMENT '员工姓名',
  `s_phone` varchar(11) DEFAULT NULL COMMENT '员工电话号',
  `s_number` varchar(18) DEFAULT NULL COMMENT '身份证号',
  PRIMARY KEY (`s_id`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;

/*Data for the table `staff` */

insert  into `staff`(`s_id`,`s_name`,`s_phone`,`s_number`) values 
(1,'王晓明','130****5585','4886********0000'),
(2,'张东志','130****9999','4886********9999'),
(3,'吴晓','130****5555','4325********4455'),
(4,'刘慧','130****5556','4377********4265'),
(6,'武动','130****5558','4886********5568'),
(7,'黑信','130****5559','4206********8877'),
(8,'王潇','130****5560','4386********6666'),
(9,'灰岁','130****5544','4306********3333'),
(10,'王戊戌','130****5533','4396********9999'),
(11,'许四星','130****5522','5306********7777'),
(16,'张','1234567891','4444');
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二、文件结构

三、准备工作

application.properties

####################
#数据库四要素
#spring.datasource.url=jdbc:mysql://localhost:3306/mydb?charaterEncoding=utf-8&serverTimezone=UTC
#                                                 [    ]
#                                         上面这个位置填写数据库名字
####################
spring.datasource.url=jdbc:mysql://localhost:3306/mydb?charaterEncoding=utf-8&serverTimezone=UTC
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
#####################
#下面填写自己的数据库名字
#####################
spring.datasource.username=root
#####################
#这里是密码
#####################
spring.datasource.password=root
####################
#JPA设置
####################
spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.format_sql=true
spring.jpa.database=mysql
spring.jpa.properties.hibernate.enable.enable_lazy_load_no_trans=true
#########################
#模板缓存关闭
#########################
spring.thymeleaf.cache=false
##########################
#mybatis设置
##########################
#配置别名（统一配置包中所有实体类的别名，别名为类的简单别名）
mybatis.type-aliases-package=com.newture.entity
#配置映射文件的位置
mybatis.mapper-locations=classpath:mapper/*.xml

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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>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.newture</groupId>
    <artifactId>springboot-pagehelper</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-pagehelper</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!---->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>
        <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
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