昨天总结了本人学习springboot整合mybatis第一阶段的一些学习心得和源码，主要就算是敲了一下SpringBoot的门儿，希望能给各位的入门带给一点儿捷径，今天给各位温习一下MyBatis的分页插件PageHelper和SpringBoot的集成，它的使用也非常简单，开发更为高效。因为PageHelper插件是属于MyBatis框架的。
0.目录结构:
1.pom.xml引入jar包:
<dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.1.2</version> </dependency>
----------------------第一种整合方式(修改配置文件)---------------------------------------
2.修改Mybatis主配置文件,加上插件:(注意property的name用helperDialect，与spring整合必须用helperDialect，用dialect会报错)
SqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- <settings> 开启二级缓存 <setting name="cacheEnabled" value="true" /> </settings> --> <!-- 只需要定义个别名,这个应该有 --> <plugins> <!-- com.github.pagehelper为PageHelper类所在包名 --> <plugin interceptor="com.github.pagehelper.PageInterceptor"> <!-- 使用下面的方式配置参数，后面会有所有的参数介绍 --> <property name="helperDialect" value="mysql" /> </plugin> </plugins> </configuration>
3.MyBatisConfig .java (mybatis配置类)
package cn.qlq.config; import java.util.Properties; import javax.sql.DataSource; import org.apache.ibatis.plugin.Interceptor; import org.mybatis.spring.SqlSessionFactoryBean; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.core.io.support.ResourcePatternResolver; import com.github.pagehelper.PageInterceptor; @Configuration public class MyBatisConfig { @Bean @ConditionalOnMissingBean // 当容器里没有指定的Bean的情况下创建该对象 public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource) { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); // 设置数据源 sqlSessionFactoryBean.setDataSource(dataSource); // 设置mybatis的主配置文件 ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); Resource mybatisConfigXml = resolver.getResource("classpath:mybatis/SqlMapConfig.xml"); sqlSessionFactoryBean.setConfigLocation(mybatisConfigXml); // 设置别名包 sqlSessionFactoryBean.setTypeAliasesPackage("cn.qlq.bean"); return sqlSessionFactoryBean; } }
4.测试:
@RequestMapping("list")
public List<User> list(){
//只对紧邻的下一条select语句进行分页查询，对之后的select不起作用
PageHelper.startPage(1,3);
List<User> list = userService.findAllUser();
return list;
}
4.启动测试:
----------------------第二种整合方式(修改配置类)---------------------------------------
- SqlMapConfig.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- <settings> 开启二级缓存 <setting name="cacheEnabled" value="true" /> </settings> -->
<!-- 只需要定义个别名,这个应该有 -->
</configuration>
- MyBatisConfig .java (mybatis配置类 参数也要用helperDialect，否则会报错)
package cn.qlq.config; import java.util.Properties; import javax.sql.DataSource; import org.apache.ibatis.plugin.Interceptor; import org.mybatis.spring.SqlSessionFactoryBean; import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.core.io.Resource; import org.springframework.core.io.support.PathMatchingResourcePatternResolver; import org.springframework.core.io.support.ResourcePatternResolver; import com.github.pagehelper.PageInterceptor; @Configuration public class MyBatisConfig { @Bean @ConditionalOnMissingBean // 当容器里没有指定的Bean的情况下创建该对象 public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource) { SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); // 设置数据源 sqlSessionFactoryBean.setDataSource(dataSource); // 设置mybatis的主配置文件 ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver(); Resource mybatisConfigXml = resolver.getResource("classpath:mybatis/SqlMapConfig.xml"); sqlSessionFactoryBean.setConfigLocation(mybatisConfigXml); // 设置别名包 sqlSessionFactoryBean.setTypeAliasesPackage("cn.qlq.bean"); //分页插件 PageInterceptor pageInterceptor = new PageInterceptor(); Properties properties = new Properties(); properties.setProperty("helperDialect", "mysql"); properties.setProperty("reasonable", "true"); properties.setProperty("params", "pageNum=pageNum;pageSize=pageSize"); pageInterceptor.setProperties(properties); //添加插件 sqlSessionFactoryBean.setPlugins(new Interceptor[]{pageInterceptor}); return sqlSessionFactoryBean; } }
- 启动测试
pageHelper使用以及未集成springboot配置参考: http://www.cnblogs.com/qlqwjy/p/8442148.html
