Springboot集成Mybatis-puls
1.Mybatis-plus特點
- 無侵入:只做增強不做改變,引入它不會對現有工程產生影響,如絲般順滑
- 損耗小:啓動即會自動注入基本 CURD,性能基本無損耗,直接面向對象操作
- 強大的 CRUD 操作:內置通用 Mapper、通用 Service,僅僅通過少量配置即可實現單表大部分 CRUD 操作, 更有強大的條件構造器,滿足各類使用需求
- 支持 Lambda 形式調用:通過 Lambda 表達式,方便的編寫各類查詢條件,無需再擔心字段寫錯
- 支持多種數據庫:支持 MySQL、MariaDB、Oracle、DB2、H2、HSQL、SQLite、Postgre、 SQLServer2005、SQLServer 等多種數據庫
- 支持主鍵自動生成:支持多達 4 種主鍵策略(內含分佈式唯一 ID 生成器 - Sequence),可自由配置,完美解 決主鍵問題
- 支持 XML 熱加載:Mapper 對應的 XML 支持熱加載,對於簡單的 CRUD 操作,甚至可以無 XML 啓動 - 支持 ActiveRecord 模式:支持 ActiveRecord 形式調用,實體類只需繼承 Model 類即可進行強大的 CRUD 操 作
- 支持自定義全局通用操作:支持全局通用方法注入( Write once, use anywhere )
- 支持關鍵詞自動轉義:支持數據庫關鍵詞(order、key…)自動轉義,還可自定義關鍵詞
- 內置代碼生成器:採用代碼或者 Maven 插件可快速生成 Mapper 、 Model 、 Service 、 Controller 層代碼, 支持模板引擎,更有超多自定義配置等您來使用
- 內置分頁插件:基於 MyBatis 物理分頁,開發者無需關心具體操作,配置好插件之後,寫分頁等同於普通 List 查詢
- 內置性能分析插件:可輸出 Sql 語句以及其執行時間,建議開發測試時啓用該功能,能快速揪出慢查詢 - 內置全局攔截插件:提供全表 delete 、 update 操作智能分析阻斷,也可自定義攔截規則,預防誤操作 - 內置 Sql 注入剝離器:支持 Sql 注入剝離,有效預防 Sql 注入攻擊
2. 架構
3.作者
Mybatis-Plus是由baomidou(苞米豆)組織開發並且開源的,目前該組織大概有30人左右。 碼雲地址:https://gitee.com/organizations/baomidou
4.快速開始
sql語句
-- 創建測試表
CREATE TABLE `tb_user` (
`id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主鍵ID',
`user_name` VARCHAR(20) NOT NULL COMMENT '用戶名',
`password` VARCHAR(20) NOT NULL COMMENT '密碼',
`name` VARCHAR(30) DEFAULT NULL COMMENT '姓名',
`age` INT(11) DEFAULT NULL COMMENT '年齡',
`email` VARCHAR(50) DEFAULT NULL COMMENT '郵箱',
PRIMARY KEY (`id`) ) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
-- 插入測試數據
INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES
('1', 'zhangsan', '123456', '張三', '18', '[email protected]');
INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES
('2', 'lisi', '123456', '李四', '20', '[email protected]');
INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES
('3', 'wangwu', '123456', '王五', '28', '[email protected]');
INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES
('4', 'zhaoliu', '123456', '趙六', '21', '[email protected]');
INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES
('5', 'sunqi', '123456', '孫七', '24', '[email protected]');
項目結構
導入依賴
<?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>2.3.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.capgemini</groupId>
<artifactId>springboot_mybatisplus</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>springboot_mybatisplus</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</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--簡化代碼的工具包-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<!--mybatis-plus的springboot支持-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.1.1</version>
</dependency>
<!--mysql驅動-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
User類
package com.capgemini.pojo;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@NoArgsConstructor
@AllArgsConstructor
//@TableName("tb_user")
public class User {
// @TableId(type = IdType.AUTO)
private Long id;
private String userName;
@TableField(select = false) //查詢時不返回該字段的值
private String password;
private String name;
private Integer age;
@TableField(value = "email") //指定數據表中字段名
private String mail;
@TableField(exist = false)
private String address; //在數據庫表中是不存在的
}
UserMapper類
package com.capgemini.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.capgemini.pojo.User;
public interface UserMapper extends BaseMapper<User> {
User findById(Long id);
}
MybatisPlusConfig類
package com.capgemini.config;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
@MapperScan("com.capgemini.mapper") //設置mapper接口的掃描包
public class MybatisPlusConfig {
@Bean //配置分頁插件
public PaginationInterceptor paginationInterceptor(){
return new PaginationInterceptor();
}
}
application.properties
```java
spring.application.name = itcast-mp-springboot
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://rm-2ze3k6ugj5013171s7o.mysql.rds.aliyuncs.com:3306/work?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false
spring.datasource.username=
spring.datasource.password=
# 指定全局的配置文件
#mybatis-plus.config-location=classpath:mybatis-config.xml
# 指定Mapper.xml文件的路徑
mybatis-plus.mapper-locations = classpath*:mybatis/*.xml
# 實體對象的掃描包
mybatis-plus.type-aliases-package = com.capgemini.pojo
# 禁用自定的駝峯映射
mybatis-plus.configuration.map-underscore-to-camel-case=true
# 禁用緩存
mybatis-plus.configuration.cache-enabled=false
# 全局的id生成策略
mybatis-plus.global-config.db-config.id-type=auto
# 全局的表名的前綴
mybatis-plus.global-config.db-config.table-prefix=tb_
UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.capgemini.mapper.UserMapper">
<select id="findById" resultType="com.capgemini.pojo.User">
select * from tb_user where id = #{id}
</select>
</mapper>
log4j.properties
log4j.rootLogger=DEBUG,A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=[%t] [%c]-[%p] %m%n
mybatis-config.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--<plugins>-->
<!--<plugin interceptor="com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor"></plugin>-->
<!--</plugins>-->
</configuration>
5測試
TestMybatisSpringBoot
package com.capgemini;
import com.capgemini.mapper.UserMapper;
import com.capgemini.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import java.util.List;
@RunWith(SpringJUnit4ClassRunner.class)
@SpringBootTest
public class TestMybatisSpringBoot {
@Autowired
private UserMapper userMapper;
@Test
public void testSelectList(){
List<User> users = this.userMapper.selectList(null);
for (User user : users) {
System.out.println(user);
}
}
}
TestUserMapper
package com.capgemini;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.capgemini.mapper.UserMapper;
import com.capgemini.pojo.User;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@RunWith(SpringRunner.class)
@SpringBootTest
public class TestUserMapper {
@Autowired
private UserMapper userMapper;
@Test
public void testInsert() {
User user = new User();
user.setMail("2capgemini.com");
user.setAge(301);
user.setUserName("caocao1");
user.setName("曹操1");
user.setPassword("123456");
user.setAddress("北京");
int result = this.userMapper.insert(user); //result數據庫受影響的行數
System.out.println("result => " + result);
//獲取自增長後的id值, 自增長後的id值會回填到user對象中
System.out.println("id => " + user.getId());
}
@Test
public void testSelectById() {
User user = this.userMapper.selectById(2L);
System.out.println(user);
}
@Test
public void testUpdateById() {
User user = new User();
user.setId(1L); //條件,根據id更新
user.setAge(19); //更新的字段
user.setPassword("666666");
int result = this.userMapper.updateById(user);
System.out.println("result => " + result);
}
@Test
public void testUpdate() {
User user = new User();
user.setAge(20); //更新的字段
user.setPassword("8888888");
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.eq("user_name", "zhangsan"); //匹配user_name = zhangsan 的用戶數據
//根據條件做更新
int result = this.userMapper.update(user, wrapper);
System.out.println("result => " + result);
}
@Test
public void testUpdate2() {
UpdateWrapper<User> wrapper = new UpdateWrapper<>();
wrapper.set("age", 21).set("password", "999999") //更新的字段
.eq("user_name", "zhangsan"); //更新的條件
//根據條件做更新
int result = this.userMapper.update(null, wrapper);
System.out.println("result => " + result);
}
@Test
public void testDeleteById() {
// 根據id刪除數據
int result = this.userMapper.deleteById(9L);
System.out.println("result => " + result);
}
@Test
public void testDeleteByMap() {
Map<String, Object> map = new HashMap<>();
map.put("user_name", "zhangsan");
map.put("password", "999999");
// 根據map刪除數據,多條件之間是and關係
int result = this.userMapper.deleteByMap(map);
System.out.println("result => " + result);
}
@Test
public void testDelete() {
//用法一:
// QueryWrapper<User> wrapper = new QueryWrapper<>();
// wrapper.eq("user_name", "caocao1")
// .eq("password", "123456");
//用法二:
User user = new User();
user.setPassword("123456");
user.setUserName("caocao");
QueryWrapper<User> wrapper = new QueryWrapper<>(user);
// 根據包裝條件做刪除
int result = this.userMapper.delete(wrapper);
System.out.println("result => " + result);
}
@Test
public void testDeleteBatchIds() {
// 根據id批量刪除數據
int result = this.userMapper.deleteBatchIds(Arrays.asList(10L, 11L));
System.out.println("result => " + result);
}
@Test
public void testSelectBatchIds() {
// 根據id批量查詢數據
List<User> users = this.userMapper.selectBatchIds(Arrays.asList(2L, 3L, 4L, 100L));
for (User user : users) {
System.out.println(user);
}
}
@Test
public void testSelectOne() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
//查詢條件
wrapper.eq("password", "123456");
// 查詢的數據超過一條時,會拋出異常
User user = this.userMapper.selectOne(wrapper);
System.out.println(user);
}
@Test
public void testSelectCount() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
wrapper.gt("age", 20); // 條件:年齡大於20歲的用戶
// 根據條件查詢數據條數
Integer count = this.userMapper.selectCount(wrapper);
System.out.println("count => " + count);
}
@Test
public void testSelectList() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
//設置查詢條件
wrapper.like("email", "itcast");
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
// 測試分頁查詢
@Test
public void testSelectPage() {
Page<User> page = new Page<>(3, 1); //查詢第一頁,查詢1條數據
QueryWrapper<User> wrapper = new QueryWrapper<>();
//設置查詢條件
wrapper.like("email", "itcast");
IPage<User> iPage = this.userMapper.selectPage(page, wrapper);
System.out.println("數據總條數: " + iPage.getTotal());
System.out.println("數據總頁數: " + iPage.getPages());
System.out.println("當前頁數: " + iPage.getCurrent());
List<User> records = iPage.getRecords();
for (User record : records) {
System.out.println(record);
}
}
/**
* 自定義的方法
*/
@Test
public void testFindById() {
User user = this.userMapper.findById(2L);
System.out.println(user);
}
@Test
public void testAllEq() {
Map<String, Object> params = new HashMap<>();
params.put("name", "李四");
params.put("age", "20");
params.put("password", null);
QueryWrapper<User> wrapper = new QueryWrapper<>();
//SELECT id,user_name,name,age,email AS mail FROM tb_user WHERE password IS NULL AND name = ? AND age = ?
// wrapper.allEq(params);
//SELECT id,user_name,name,age,email AS mail FROM tb_user WHERE name = ? AND age = ?
// wrapper.allEq(params, false);
//SELECT id,user_name,name,age,email AS mail FROM tb_user WHERE age = ?
// wrapper.allEq((k, v) -> (k.equals("age") || k.equals("id")) , params);
//SELECT id,user_name,name,age,email AS mail FROM tb_user WHERE name = ? AND age = ?
wrapper.allEq((k, v) -> (k.equals("age") || k.equals("id") || k.equals("name")), params);
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
@Test
public void testEq() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
//SELECT id,user_name,password,name,age,email FROM tb_user WHERE password = ? AND age >= ? AND name IN (?,?,?)
wrapper.eq("password", "123456")
.ge("age", 20)
.in("name", "李四", "王五", "趙六");
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
@Test
public void testLike() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
// SELECT id,user_name,name,age,email AS mail FROM tb_user WHERE name LIKE ?
// 參數:%五(String)
wrapper.likeLeft("name", "五");
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
@Test
public void testOrderByAgeDesc() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
//按照年齡倒序排序
// SELECT id,user_name,name,age,email AS mail FROM tb_user ORDER BY age DESC
wrapper.orderByDesc("age");
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
@Test
public void testOr() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
// SELECT id,user_name,name,age,email AS mail FROM tb_user WHERE name = ? OR age = ?
wrapper.eq("name", "王五").or().eq("age", 21);
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
@Test
public void testSelect() {
QueryWrapper<User> wrapper = new QueryWrapper<>();
//SELECT id,name,age FROM tb_user WHERE name = ? OR age = ?
wrapper.eq("name", "王五")
.or()
.eq("age", 21)
.select("id", "name", "age"); //指定查詢的字段
List<User> users = this.userMapper.selectList(wrapper);
for (User user : users) {
System.out.println(user);
}
}
}
源碼
https://gitee.com/du_jing_tao/springbootmybatis.git