spring boot和mybatis整合分頁外掛
MyBatis提供了攔截器介面,我們可以實現自己的攔截器,將其作為一個plugin裝入到SqlSessionFactory中。
首先要說的是,Spring在依賴注入bean的時候,會把所有實現MyBatis中Interceptor介面的所有類都注入到SqlSessionFactory中,作為plugin存在。既然如此,我們整合一個plugin便很簡單了,只需要使用@Bean建立PageHelper物件即可。
1、新增pom依賴
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>4.1.0</version>
</dependency>
2、MyBatisConfiguration.java類配置
package com.example.mybatis;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.transaction.annotation.TransactionManagementConfigurer;
import com.github.pagehelper.PageHelper;
@Configuration
//加上這個註解,使得支援事務
@EnableTransactionManagement
public class MyBatisConfig implements TransactionManagementConfigurer {
@Autowired
private DataSource dataSource;
@Override
public PlatformTransactionManager annotationDrivenTransactionManager() {
return new DataSourceTransactionManager(dataSource);
}
@Bean(name = "sqlSessionFactory")
public SqlSessionFactory sqlSessionFactoryBean(PageHelper pageHelper) {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(dataSource);
//自定義資料庫配置的時候,需要將pageHelper的bean注入到Plugins中,如果採用系統預設的資料庫配置,則只需要定義pageHelper的bean,會自動注入。
bean.setPlugins(new Interceptor[] { pageHelper });
try {
return bean.getObject();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
@Bean
public SqlSessionTemplate sqlSessionTemplate(SqlSessionFactory sqlSessionFactory) {
return new SqlSessionTemplate(sqlSessionFactory);
}
@Bean
public PageHelper pageHelper() {
PageHelper pageHelper = new PageHelper();
Properties p = new Properties();
p.setProperty("offsetAsPageNum", "true");
p.setProperty("rowBoundsWithCount", "true");
p.setProperty("reasonable", "true");
p.setProperty("dialect", "mysql");
pageHelper.setProperties(p);
return pageHelper;
}
}
3、分頁查詢測試
@RequestMapping("/likename")
public List<Student> likeName(@RequestParam String name){
PageHelper.startPage(1, 1);
return stuMapper.likeName(name);
}