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.BaseMapper mapper.not-empty=false mapper.identity=MYSQL # ##pagehelper pagehelper.helperDialect=mysql pagehelper.reasonable=true pagehelper.supportMethodsArguments=true pagehelper.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