spring-boot集成PageHelper和通用Mapper

前提条件：已经集成mybatis

代码生成步骤：

添加依赖

<dependency>    <groupId>tk.mybatis</groupId>    <artifactId>mapper-spring-boot-starter</artifactId>    <version>1.1.4</version></dependency><dependency>    <groupId>org.mybatis.generator</groupId>    <artifactId>mybatis-generator-core</artifactId>    <version>1.3.6</version></dependency>

创建一个拥有main方法的类，代码如下

package com.ghaien.generator;import org.mybatis.generator.api.MyBatisGenerator;import org.mybatis.generator.config.Configuration;import org.mybatis.generator.config.xml.ConfigurationParser;import org.mybatis.generator.internal.DefaultShellCallback;import sun.nio.cs.Surrogate.Generator;import java.util.ArrayList;import java.util.List;public class GeneratorMain {    /**     * 代码生成器     * @param args     * @throws Exception     */    public static void main(String[] args) throws Exception {        List<String> warnings = new ArrayList<>();        boolean overwrite = true;        ConfigurationParser cp = new ConfigurationParser(warnings);        Configuration config = cp.parseConfiguration(                  Generator.class.getResourceAsStream("/generator/generatorConfig.xml"));        DefaultShellCallback callback = new DefaultShellCallback(overwrite);        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config, callback, warnings);        myBatisGenerator.generate(null);    }}

在上面代码中对应的目录下创建generatorConfig.xml配置文件

<?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="Mysql" targetRuntime="MyBatis3Simple" defaultModelType="flat">        <plugin type="tk.mybatis.mapper.generator.MapperPlugin">            <property name="mappers" value="tk.mybatis.mapper.common.Mapper"/>            <!-- caseSensitive默认false，当数据库表名区分大小写时，可以将该属性设置为true -->            <property name="caseSensitive" value="true"/>        </plugin>        <jdbcConnection driverClass="com.mysql.jdbc.Driver"                        connectionURL="jdbc:mysql://localhost:3306/test"                        userId="root"                        password="1234">        </jdbcConnection>        <!--生成的实体类的存储路径和包名-->        <javaModelGenerator targetPackage="com.ghaien.dao.pojo.vo"              targetProject="E:\document\IdeaProjects\spring-boot-demo\src\main\java"/>        <!--生成的*Mapper.xml文件的存储位置-->        <sqlMapGenerator targetPackage="mapper"               targetProject="E:\document\IdeaProjects\spring-boot-demo\src\main\resources"/>        <!--生成的*Mapper.java文件的存储位置和包名-->        <javaClientGenerator targetPackage="com.ghaien.dao.mapper"              targetProject="E:\document\IdeaProjects\spring-boot-demo\src\main\java" type="XMLMAPPER" />        <!--对应数据库中表名（可以使用"%" 对应所有表）-->        <table tableName="user" >            <!--该表有一个id自增的主键，在生成实体类的时候会根据该配置生成相应的注解-->            <generatedKey column="id" sqlStatement="Mysql" identity="true"/>        </table>    </context></generatorConfiguration>

以上配置可根据具体的需求进行配置

执行main方法

集成步骤：

添加依赖

<dependency>    <groupId>tk.mybatis</groupId>    <artifactId>mapper-spring-boot-starter</artifactId>    <version>1.1.4</version></dependency><dependency>    <groupId>com.github.pagehelper</groupId>    <artifactId>pagehelper-spring-boot-starter</artifactId>    <version>1.2.1</version></dependency>

application.properties中增加如下配置

##mapper##mappers 多个接口时逗号隔开mapper.mappers=com.ghaien.utils.mapper.BaseMappermapper.not-empty=falsemapper.identity=MYSQL###pagehelperpagehelper.helperDialect=mysqlpagehelper.reasonable=truepagehelper.supportMethodsArguments=truepagehelper.params=count=countSql

将生成的*Mapper.xml文件移动到application.properties中mybatis.mapperLocations对用的目录下，随意移动生成的实体类位置创建BaseMapper(命名随意)接口，位置跟配置文件中的mapper.mappers对应，代码如下

package com.ghaien.utils.mapper;import tk.mybatis.mapper.common.Mapper;import tk.mybatis.mapper.common.MySqlMapper;public interface BaseMapper<T> extends Mapper<T>, MySqlMapper<T> {}

修改生成的*Mapper.java文件，使其继承BaseMapper，并移动到@MapperScan能扫描到的路径下，代码如下

package com.ghaien.dao.mapper;import com.ghaien.dao.pojo.vo.User;import org.apache.ibatis.annotations.Param;import tk.mybatis.mapper.common.BaseMapper;public interface UserMapper extends BaseMapper<User> {    /**     * 测试UserMapper.xml文件路径是否正确     * @param id     * @return     */    User queryById(@Param("id") Long id);}

注意：BaseMapper不能被@MapperScan扫描到

测试是否成功集成，代码如下

package com.ghaien.dao.mapper;import com.ghaien.dao.pojo.vo.User;import com.github.pagehelper.Page;import com.github.pagehelper.PageHelper;import org.junit.Test;import org.junit.runner.RunWith;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import java.util.List;/** * Created by ghaien on 2018/1/29. */@SpringBootTest@RunWith(SpringRunner.class)public class UserMapperTest {    @Autowired    private UserMapper userMapper;    private Logger log = LoggerFactory.getLogger(this.getClass());    @Test    public void testQueryByPage() {//        PageHelper.startPage(2, 1);//        List<User> users = userMapper.selectAll();//        for (User user : users) {//            log.info("userName = " + user.getUserName());//        }        Page<User> page = PageHelper.startPage(2, 1).doSelectPage(() -> {            userMapper.selectAll();        });        for (User user : page) {            log.info("userName = " + user.getUserName());        }    }}

以上两种方法最后输出的结果是一致的，若想查看sql语句只需在配置文件中增加如下配置即可

logging.level.com.ghaien.dao=debug

完整代码

一个人的天地是冷得连呼吸都会寂寞的颤栗，而麻烦，