Java：Spring Boot整合mybatis-plus示例

标签：Java name 示例 Spring email baomidou import com id

文档

使用示例

$ tree -I target
.
├── pom.xml
└── src
    ├── main
    │   ├── java
    │   │   └── com
    │   │       └── example
    │   │           └── demo
    │   │               ├── DemoApplication.java
    │   │               ├── entity
    │   │               │   └── User.java
    │   │               └── mapper
    │   │                   └── UserMapper.java
    │   └── resources
    │       ├── application.yml
    │       ├── db
    │       │   ├── data-h2.sql
    │       │   └── schema-h2.sql
    │       └── spy.properties
    └── test
        └── java
            └── com
                └── example
                    └── demo
                        └── SampleTest.java

下载初始项目 https://start.spring.io/

Project Maven Project
Language Java
Spring Boot 2.7.5
Packaging Jar
Java 8

依赖

pom.xml

<parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.7.5</version>
  <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
  <java.version>1.8</java.version>
</properties>

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

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

  <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.2</version>
  </dependency>

  <dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <scope>runtime</scope>
  </dependency>

  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.24</version>
    <scope>provided</scope>
  </dependency>

  <dependency>
    <groupId>p6spy</groupId>
    <artifactId>p6spy</artifactId>
    <version>3.9.1</version>
  </dependency>
</dependencies>

SQL文件

schema-h2.sql

DROP TABLE IF EXISTS `user`;

CREATE TABLE `user`
(
    id BIGINT NOT NULL COMMENT '主键ID',
    name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名',
    age INT NULL DEFAULT NULL COMMENT '年龄',
    email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱',
    PRIMARY KEY (id)
);

data-h2.sql

DELETE FROM `user`;

INSERT INTO `user` (id, name, age, email) VALUES
(1, 'Jone', 18, '[email protected]'),
(2, 'Jack', 20, '[email protected]'),
(3, 'Tom', 28, '[email protected]'),
(4, 'Sandy', 21, '[email protected]'),
(5, 'Billie', 24, '[email protected]');

配置文件

application.yml

# DataSource Config
spring:
  datasource:
    # driver-class-name: org.h2.Driver
    # 打印执行SQL
    driver-class-name: com.p6spy.engine.spy.P6SpyDriver
    url: jdbc:p6spy:h2:mem:test
    username: root
    password: test
  sql:
    init:
      schema-locations: classpath:db/schema-h2.sql
      data-locations: classpath:db/data-h2.sql
      encoding: UTF-8

spy.properties

#3.2.1以上使用
modulelist=com.baomidou.mybatisplus.extension.p6spy.MybatisPlusLogFactory,com.p6spy.engine.outage.P6OutageFactory
#3.2.1以下使用或者不配置
#modulelist=com.p6spy.engine.logging.P6LogFactory,com.p6spy.engine.outage.P6OutageFactory
# 自定义日志打印
logMessageFormat=com.baomidou.mybatisplus.extension.p6spy.P6SpyLogger
#日志输出到控制台
appender=com.baomidou.mybatisplus.extension.p6spy.StdoutLogger
# 使用日志系统记录 sql
#appender=com.p6spy.engine.spy.appender.Slf4JLogger
# 设置 p6spy driver 代理
deregisterdrivers=true
# 取消JDBC URL前缀
useprefix=true
# 配置记录 Log 例外,可去掉的结果集有error,info,batch,debug,statement,commit,rollback,result,resultset.
excludecategories=info,debug,result,commit,resultset
# 日期格式
dateformat=yyyy-MM-dd HH:mm:ss
# 实际驱动可多个
#driverlist=org.h2.Driver
# 是否开启慢SQL记录
outagedetection=true
# 慢SQL记录标准 2 秒
outagedetectioninterval=2

实体类

User.java

package com.example.demo.entity;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;


@Data
@TableName("`user`")
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

Mapper

UserMapper.java

package com.example.demo.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.example.demo.entity.User;

public interface UserMapper extends BaseMapper<User> {

}

程序入口

DemoApplication.java

package com.example.demo;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.example.demo.mapper")
public class DemoApplication {

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

}

查询测试

SampleTest.java

package com.example.demo;


import com.example.demo.entity.User;
import com.example.demo.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;


import java.util.List;

@SpringBootTest
public class SampleTest {

    @Autowired
    private UserMapper userMapper;

    @Test
    public void testSelect() {
        System.out.println(("----- selectAll method test ------"));
        List<User> userList = userMapper.selectList(null);
        userList.forEach(System.out::println);
    }
}

打印日志

Consume Time：2 ms 2022-11-22 09:42:16
 Execute SQL：DROP TABLE IF EXISTS `user`

 Consume Time：5 ms 2022-11-22 09:42:16
 Execute SQL：CREATE TABLE `user` ( 
    id BIGINT NOT NULL COMMENT '主键ID', 
    name VARCHAR(30) NULL DEFAULT NULL COMMENT '姓名', 
    age INT NULL DEFAULT NULL COMMENT '年龄', 
    email VARCHAR(50) NULL DEFAULT NULL COMMENT '邮箱', 
    PRIMARY KEY (id) 
)

 Consume Time：3 ms 2022-11-22 09:42:16
 Execute SQL：DELETE FROM `user`

 Consume Time：2 ms 2022-11-22 09:42:16
 Execute SQL：INSERT INTO `user` (id, name, age, email) VALUES 
 (1, 'Jone', 18, '[email protected]'), 
 (2, 'Jack', 20, '[email protected]'), 
 (3, 'Tom', 28, '[email protected]'), 
 (4, 'Sandy', 21, '[email protected]'), 
 (5, 'Billie', 24, '[email protected]')

----- selectAll method test ------
 Consume Time：3 ms 2022-11-22 09:42:16
 Execute SQL：SELECT id,name,age,email FROM `user`

User(id=1, name=Jone, age=18, [email protected])
User(id=2, name=Jack, age=20, [email protected])
User(id=3, name=Tom, age=28, [email protected])
User(id=4, name=Sandy, age=21, [email protected])
User(id=5, name=Billie, age=24, [email protected])

报错及解决

报错

org.springframework.jdbc.BadSqlGrammarException: 
### Error querying database.  Cause: org.h2.jdbc.JdbcSQLSyntaxErrorException: 
Syntax error in SQL statement "SELECT  id,name,age,email  FROM [*]user";
expected "identifier";SQL statement:
SELECT  id,name,age,email  FROM user [42001-214]

解决

package com.example.demo.entity;

import com.baomidou.mybatisplus.annotation.TableName;
import lombok.Data;

// 增加表名注解`user`
@Data
@TableName("`user`")
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
}

标签：Java,name,示例,Spring,email,baomidou,import,com,id
From： https://blog.51cto.com/mouday/5889751