Spring Boot(三)整合MyBatis,MyBatis Generator
阿新 • • 發佈:2018-11-08
簡介
MyBatis 是一款優秀的持久層框架,它支援定製化 SQL、儲存過程以及高階對映。MyBatis 避免了幾乎所有的 JDBC 程式碼和手動設定引數以及獲取結果集。MyBatis 可以使用簡單的 XML 或註解來配置和對映原生資訊,將介面和 Java 的 POJOs(Plain Old Java Objects,普通的 Java物件)對映成資料庫中的記錄。
MyBatis Generator 是一款MyBatis 的程式碼生成器外掛,可以根據資料庫表字段自動生成對應的pojo類、mapper.xml檔案、dao介面。自動生成的mapper.xml檔案有常用的sql語句,能省去我們一大堆工作量。
引入依賴
Spring Boot整合Mybatis需要引入以下依賴:
<!--spring boot與mybatis的整合--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <!--mysql驅動--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency>
引入generator外掛
在maven的plugins節點下引入該generator的外掛:
<plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.5</version> <dependencies> <dependency> <groupId> mysql</groupId> <artifactId> mysql-connector-java</artifactId> <version> 5.1.39</version> </dependency> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.3.5</version> </dependency> </dependencies> <executions> <execution> <id>Generate MyBatis Artifacts</id> <phase>package</phase> <goals> <goal>generate</goal> </goals> </execution> </executions> <configuration> <!--允許移動生成的檔案 --> <verbose>true</verbose> <!-- 是否覆蓋 --> <overwrite>true</overwrite> <!-- 自動生成的配置 --> <configurationFile> src/main/resources/mybatis-generator.xml</configurationFile> </configuration> </plugin>
表結構
tbl_user表的結構與資料如下:
基本配置
在application.yml中配置資料庫連線資訊與mybatis的相關配置:
spring:
datasource: #資料來源配置
url: jdbc:mysql://localhost:3306/ssm-crud?characterEncoding=utf-8&useSSL=false
username: root
password: 123456
driver-class-name: com.mysql.cj.jdbc.Driver
mybatis:
type-aliases-package: com.huang.bean #配置pojo類的位置
mapper-locations: classpath:mapper/*.xml #配置mapper.xml的位置
configuration:
map-underscore-to-camel-case: true #開啟駝峰命名
generator配置
在src\main\resources下新建mybatis-generator.xml檔案:
<?xml version="1.0" encoding="UTF-8"?>
<!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="DB2Tables" targetRuntime="MyBatis3">
<!--不生成註釋-->
<commentGenerator>
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--配置資料庫連線-->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/ssm-crud?useSSL=false"
userId="root"
password="123456">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--
指定javaBean生成的位置
targetPackage:生成的包的位置
targetProject:生成在哪個工程下
-->
<javaModelGenerator targetPackage="com.huang.bean" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--指定sql對映檔案生成的位置-->
<sqlMapGenerator targetPackage="mapper" targetProject=".\src\main\resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--指定dao介面生成的位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.huang.dao" targetProject=".\src\main\java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--
指定每個表的生成策略
tableName:表明
domainObjectName:javabean的類名
-->
<table tableName="tbl_user" domainObjectName="User"/>
</context>
</generatorConfiguration>
執行generator
根據上面再mybatis-generator.xml配置的路徑,建立對應的package,雙擊maven外掛執行generator外掛:
控制檯輸出BUILD SUCCESS則證明generator外掛執行成功:
[INFO] Scanning for projects...
[INFO]
[INFO] --------------------< com.huang:springbootmybatis >---------------------
[INFO] Building springbootmybatis 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- mybatis-generator-maven-plugin:1.3.5:generate (default-cli) @ springbootmybatis ---
[INFO] Connecting to the Database
[INFO] Introspecting table tbl_user
[INFO] Generating Example class for table tbl_user
[INFO] Generating Record class for table tbl_user
[INFO] Generating Mapper Interface for table tbl_user
[INFO] Generating SQL Map for table tbl_user
[INFO] Saving file UserMapper.xml
[INFO] Saving file UserExample.java
[INFO] Saving file User.java
[INFO] Saving file UserMapper.java
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.926 s
[INFO] Finished at: 2018-11-02T19:55:25+08:00
[INFO] ------------------------------------------------------------------------
執行完generator外掛後,會在對應的包生成對應的檔案:
編寫程式碼
IUserService.java
public interface IUserService {
User get(Integer id);
}
UserServiceImpl.java
@Service("iUserService")
public class UserServiceImpl implements IUserService {
@Autowired
private UserMapper userMapper;
@Override
public User get(Integer id) {
return userMapper.selectByPrimaryKey(id);
}
}
UserController.java
@RestController
public class UserController {
@Autowired
private IUserService iUserService;
@GetMapping("/get_user/{userId}")
public User getUser(@PathVariable("userId") Integer userId){
User user =iUserService.get(userId);
return user;
}
}
測試
執行專案,訪問localhost:8080/get_user/1,瀏覽器輸出資訊如下,整合成功: