SpringBoot 整合mybatis 及使用generator，pageHelper外掛
阿新 • • 發佈：2018-11-01
SpringBoot 整合mybatis 及使用generator，pageHelper外掛
一.新建springBoot專案
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二.pom檔案配置
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.example</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.5.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!--mysql驅動包--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.46</version> </dependency> <!--阿里資料連線源--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.9</version> </dependency> <!--mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.0</version> </dependency> <!-- 分頁外掛 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>RELEASE</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- mybatis generator 自動生成程式碼外掛 --> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>1.3.2</version> <configuration> <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile> <overwrite>true</overwrite> <verbose>true</verbose> </configuration> </plugin> </plugins> </build> </project>
注意這裡匯入的包都是與springBoot相關的，導錯包會導致專案啟動失敗
導完包ReImport一下 pom檔案右鍵
三.建立資料庫
CREATE TABLE `user` ( `id` int(10) NOT NULL AUTO_INCREMENT, `username` char(16) DEFAULT NULL, `password` char(6) DEFAULT NULL, `isVip` tinyint(1) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8;
四.建立專案結構目錄
generator用於存放自動生成程式碼的配置檔案，mapper用於存放自動生成的mybatis的對映檔案，model用於存放自動生成的實體類pojo
五.springBoot配置檔案配置
這裡使用yml格式的配置檔案
server: port: 8080 spring: datasource: name: mysql_test type: com.alibaba.druid.pool.DruidDataSource #druid相關配置 druid: #監控統計攔截的filters filters: stat driver-class-name: com.mysql.jdbc.Driver #基本屬性 url: jdbc:mysql://127.0.0.1:3306/test username: root password: 123456.. #配置初始化大小/最小/最大 initial-size: 1 min-idle: 1 max-active: 20 #獲取連線等待超時時間 max-wait: 60000 #間隔多久進行一次檢測，檢測需要關閉的空閒連線 time-between-eviction-runs-millis: 60000 #一個連線在池中最小生存的時間 min-evictable-idle-time-millis: 300000 validation-query: SELECT 'x' test-while-idle: true test-on-borrow: false test-on-return: false #開啟PSCache，並指定每個連線上PSCache的大小。oracle設為true，mysql設為false。分庫分表較多推薦設定為false pool-prepared-statements: false max-pool-prepared-statement-per-connection-size: 20 #mybatis mybatis: type-aliases-package: com.example.demo.model mapper-locations: classpath:mapper/*.xml #pagehelper pagehelper: helperDialect: mysql reasonable: true supportMethodsArguments: true params: count=countSql returnPageInfo: check
六.自動生成程式碼
建立自動生成的配置檔案generatorConfig.xml
<?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>
<!-- 資料庫驅動:選擇你的本地硬碟上面的資料庫驅動包-->
<classPathEntry location="E:\Java\mysql\mysql-connector-java-5.1.45-bin.jar"/>
<context id="DB2Tables" targetRuntime="MyBatis3">
<commentGenerator>
<property name="suppressDate" value="true"/>
<!-- 是否去除自動生成的註釋 true：是 ： false:否 -->
<property name="suppressAllComments" value="true"/>
</commentGenerator>
<!--資料庫連結URL，使用者名稱、密碼 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/test" userId="root" password="123456..">
</jdbcConnection>
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!-- 生成模型的包名和位置-->
<javaModelGenerator targetPackage="com.example.demo.model" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!-- 生成對映檔案的包名和位置-->
<sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!-- 生成DAO的包名和位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.example.demo.dao" targetProject="src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!-- 要生成的表 tableName是資料庫中的表名或檢視名 domainObjectName是實體類名-->
<table tableName="user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
</context>
</generatorConfiguration>
這裡的自動生成的路徑要根據專案的實際路徑進行更改，資料庫驅動選擇本地的jar包。
下面建立自動生成程式碼的maven命令
idea右上角
選擇Maven
點選OK，並執行
此時自動生成了pojo檔案，UserMapper及UserMapper.xml檔案
七.簡單的實現各層程式碼
UserMapper介面增加一個方法以便測試分頁
package com.example.demo.dao;
import com.example.demo.model.User;
import java.util.List;
public interface UserMapper {
int deleteByPrimaryKey(Integer id);
int insert(User record);
int insertSelective(User record);
User selectByPrimaryKey(Integer id);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);
//增加的方法
List<User> selectAll();
}
UserMapperImp.java
package com.example.demo.mapper.imp;
import com.example.demo.mapper.UserMapper;
import com.example.demo.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public class UserMapperImp implements UserMapper {
@Autowired
private UserMapper userMapper;
@Override
public int deleteByPrimaryKey(Integer id) {
return userMapper.deleteByPrimaryKey(id);
}
@Override
public int insert(User record) {
return userMapper.insert(record);
}
@Override
public int insertSelective(User record) {
return userMapper.insertSelective(record);
}
@Override
public User selectByPrimaryKey(Integer id) {
return userMapper.selectByPrimaryKey(id);
}
@Override
public int updateByPrimaryKeySelective(User record) {
return userMapper.updateByPrimaryKeySelective(record);
}
@Override
public int updateByPrimaryKey(User record) {
return userMapper.updateByPrimaryKey(record);
}
@Override
public List<User> selectAll() {
return userMapper.selectAll();
}
}
UserService介面
package com.example.demo.service;
import com.example.demo.model.User;
import java.util.List;
public interface UserService {
List<User> selectAll();
}
UserServiceImp.java
package com.example.demo.service.imp;
import com.example.demo.dao.UserMapper;
import com.example.demo.model.User;
import com.example.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImp implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public List<User> selectAll() {
return userMapper.selectAll();
}
}
TestController.java
package com.example.demo.controller;
import com.example.demo.model.User;
import com.example.demo.service.UserService;
import com.github.pagehelper.PageHelper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class TestController {
@Autowired
private UserService userService;
@RequestMapping(value = "selectAll")
public Object selectAll(){
PageHelper.startPage(3,3);
List<User> users = userService.selectAll();
return users;
}
}
UserMapper.xml實現測試sql
<select id="selectAll" resultType="com.example.demo.model.User">
select * from user
</select>
啟動函式加入掃描
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.dao")
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
八.測試
執行啟動函式
用瀏覽器測試，資料庫裡只放了7條資料所以第三頁只有一條資料
轉載於springboot整合mybatis
