SpringBoot整合MybatisPlus基本的增删改查，保姆级教程

1|0概述
MybatisPlus是国产的第三方插件， 它封装了许多常用的CURDapi，免去了我们写mapper.xml的重复劳动，这里介绍了基本的整合SpringBoot和基础用法。

2|0引入依赖

在项目中pom文件引入mybatisplus和mysql驱动依赖，如下图

    <dependency>        <groupId>com.baomidou</groupId>        <artifactId>mybatis-plus-boot-starter</artifactId>        <version>3.5.1</version>    </dependency>     <dependency>         <groupId>mysql</groupId>         <artifactId>mysql-connector-java</artifactId>         <version>8.0.26</version>     </dependency>

3|0配置连接信息

在项目中application.yaml文件中配置数据库的连接信息

spring:  datasource:    driver-class-name: com.mysql.cj.jdbc.Driver    url: jdbc:mysql://127.0.0.1:3306/didiadmin?useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull&useSSL=true&serverTimezone=GMT%2B8&nullCatalogMeansCurrent=true    username: root    password: 123456

4|0新建两个表

本案例通过一个完整的业务流程来介绍如何使用mybatispuls，首先在数据库中新建两个表，一个是字典类型表sys_dict_type和一个字典数据表sys_dict_data

CREATE TABLE `sys_dict_type` (`id` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '标识',`type_name` VARCHAR (255) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '字典类型名称', `type_code` VARCHAR (255) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '字典类型标识', `description` VARCHAR (255) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '字典类型描述', `enable` CHAR (1) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '是否启用', `create_by` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '创建人ID',  `create_name` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '创建人名称', `create_time` datetime DEFAULT NULL COMMENT '创建时间', `update_by` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '修改人ID', `update_name` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '修改人名称', `update_time` datetime DEFAULT NULL COMMENT '修改时间', `remark` VARCHAR (255) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '备注', PRIMARY KEY (`id`) USING BTREE) ENGINE = INNODB DEFAULT CHARSET = utf8mb4 COLLATE = utf8mb4_general_ci ROW_FORMAT = DYNAMICCREATE TABLE `sys_dict_data` (`data_id` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '标识',`data_label` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '字典标签', `data_value` CHAR (20) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '字典值', `type_code` CHAR (20) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '所属类型', `is_default` CHAR (1) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '是否默认', `update_by` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '修改人ID',   `update_name` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '修改人名称', `update_time` datetime DEFAULT NULL COMMENT '修改时间', `create_by` VARCHAR (255) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT '创建人ID',   `create_name` CHAR (19) CHARACTERSET utf8mb4 COLLATE utf8mb4_general_ci DEFAULT NULL COMMENT