SpringBoot整合MyBatis 使用Generatot外掛
阿新 • • 發佈：2021-10-19
SpringBoot整合MyBatis
使用MyBatis Generatot外掛
系統要求
Java 8+
springBoot2.5 +
建立springBoot專案工程
匯入依賴
<properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.5</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.2.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> <optional>true</optional> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.25</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.4.0</version> <dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.7</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.25</version> </dependency> </dependencies> <executions> <execution> <id>Generate MyBatis Artifacts</id> <goals> <goal>generate</goal> </goals> </execution> </executions> <configuration> <overwrite>true</overwrite> </configuration> </plugin> <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>
檢視是否有MyBatis Generator外掛
配置application.yml
spring: datasource: driver-class-name: com.mysql.cj.jdbc.Driver url: jdbc:mysql://localhost:3307/webapp1 # ?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8 username: webapp1 password: webapp1 #Spring Boot 預設是不注入這些屬性值的，需要自己繫結 #druid 資料來源專有配置 # 初始化大小，最小，最大 initialSize: 5 minIdle: 5 maxActive: 200 # 配置獲取連線等待超時的時間 maxWait: 60000 # 配置間隔多久才進行一次檢測，檢測需要關閉的空閒連線，單位是毫秒 timeBetweenEvictionRunsMillis: 60000 # 配置一個連線在池中最小生存的時間，單位是毫秒 minEvictableIdleTimeMillis: 300000 # 用來檢測連線是否有效的sql，要求是一個查詢語句 validationQuery: SELECT 1 FROM DUAL # 建議配置為true，不影響效能，並且保證安全性。申請連線的時候檢測，如果空閒時間大於timeBetweenEvictionRunsMillis，執行validationQuery檢測連線是否有效。 testWhileIdle: true # 申請連線時執行validationQuery檢測連線是否有效，做了這個配置會降低效能 testOnBorrow: false # 歸還連線時執行validationQuery檢測連線是否有效，做了這個配置會降低效能。 testOnReturn: false # 是否快取preparedStatement，也就是PSCache。PSCache對支援遊標的資料庫效能提升巨大，比如說oracle。在mysql下建議關閉。 poolPreparedStatements: true # 要啟用PSCache，必須配置大於0，當大於0時，poolPreparedStatements自動觸發修改為true。 max-pool-prepared-statement-per-connection-size: 50 #配置監控統計攔截的filters，stat:監控統計、log4j：日誌記錄、wall：防禦sql注入 #如果允許時報錯 java.lang.ClassNotFoundException: org.apache.log4j.Priority #則匯入 log4j 依賴即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j filters: stat,wall,log4j # 合併多個DruidDataSource的監控資料 useGlobalDataSourceStat: true # 通過connectProperties屬性來開啟mergeSql功能；慢SQL記錄 connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500 mybatis: #sql對映檔案的位置 # mapper-locations: classpath:com/xiang/mapper/*.xml mapper-locations: classpath:mapper/*.xml #開啟駝峰命名轉化 configuration: map-underscore-to-camel-case: true #開啟別名 # type-aliases-package: com.xiang
配置generatorConfig.xml
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"> <generatorConfiguration> <context id="simple" targetRuntime="MyBatis3Simple"> <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3307/webapp1" userId="webapp1" password="webapp1"/> <!-- useSSL=true&useUnicode=true&characterEncoding=UTF-8"--> <!-- <commentGenerator>--> <!-- <!– 是否去除自動生成的註釋 true：是 ： false:否 –>--> <!-- <property name="suppressAllComments" value="false" />--> <!-- </commentGenerator>--> <javaModelGenerator targetPackage="com.xiang.model" targetProject="src/main/java"/> <sqlMapGenerator targetPackage="com.xiang.mapper" targetProject="src/main/resources"/> <javaClientGenerator targetPackage="com.xiang.mapper" targetProject="src/main/java" type="XMLMAPPER"/> <table tableName="user"/> </context> </generatorConfiguration>
編寫mapper、model 這兩個包。
（只寫包名就好）包下邊的實體類、與介面、xml檔案使用外掛生成
如圖所示：
現在點選外掛
生成實體類、與介面、xml檔案
生成的檔案如圖所示
接下來建立service、controller層
編寫UserService
package com.xiang.service;
import com.xiang.model.User;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/19 11:24
*/
public interface UserService {
int deleteByPrimaryKey(Integer id);
int insert(User record);
User selectByPrimaryKey(Integer id);
List<User> selectAll();
int updateByPrimaryKey(User record);
}
編寫UserServiceImpl
package com.xiang.service.impl;
import com.xiang.mapper.UserMapper;
import com.xiang.model.User;
import com.xiang.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/19 11:27
*/
@Repository
public class UserServiceImpl implements UserService{
@Autowired
UserMapper userMapper;
@Override
public int deleteByPrimaryKey(Integer id) {
return userMapper.deleteByPrimaryKey(id);
}
@Override
public int insert(User record) {
return userMapper.insert(record);
}
@Override
public User selectByPrimaryKey(Integer id) {
return userMapper.selectByPrimaryKey(id);
}
@Override
public List<User> selectAll() {
return userMapper.selectAll();
}
@Override
public int updateByPrimaryKey(User record) {
return userMapper.updateByPrimaryKey(record);
}
}
執行測試UserServiceImpl
package com.xiang.service;
import com.xiang.mapper.UserMapper;
import com.xiang.model.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/19 11:30
*/
/**
* int deleteByPrimaryKey(Integer id);
* int insert(User record);
* User selectByPrimaryKey(Integer id);
* List<User> selectAll();
* int updateByPrimaryKey(User record);
*/
@SpringBootTest
public class UserServiceImpl {
@Autowired
UserService userService;
/**
* 查所有
*/
@Test
public void selectAll() {
List<User> list = userService.selectAll();
for (User user : list) {
System.out.println(user);
}
}
}