PageHelper在Spring+Spring MVC+MyBatis中的配置使用
阿新 • • 發佈:2018-12-01
本文件基於配置好了的Spring + Spring MVC + MyBatis,可以參考:
http://www.cnblogs.com/QingXiaxu/p/8144968.html
裡面有原始碼下載,基於其中的ssm程式碼
1、新增PageHelper依賴
<!-- pagehelper分頁外掛 --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.1.2</version> </dependency>
2、在applicationContext.xml中新增PageHelper配置(黃色背景處)
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:mybatis="http://mybatis.org/schema/mybatis-spring" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd "> <!-- mybatis:scan會將com.app.mapper包裡的所有介面當作mapper配置,之後可以自動引入mapper類 --> <mybatis:scan base-package="com.app.mapper" /> <!-- 掃描com.app包下面的java檔案,有Spring的相關注解的類,則把這些類註冊為Spring的bean --> <context:component-scan base-package="com.app" /> <!-- 使用PropertyOverrideConfigurer後處理器載入資料來源引數 --> <context:property-override location="classpath:db.properties" /> <!-- 配置c3p0資料來源 --> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" /> <!-- 配置SqlSessionFactory,org.mybatis.spring.SqlSessionFactoryBean是Mybatis社群開發用於整合Spring的bean --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" p:dataSource-ref="dataSource"> <property name="plugins"> <array> <bean class="com.github.pagehelper.PageInterceptor"> <property name="properties"> <value> helperDialect=mysql </value> </property> </bean> </array> </property> </bean> <!-- JDBC事務管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" p:dataSource-ref="dataSource" /> <!-- 啟用支援annotation註解方式事務管理 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
3、在UserMapper.java裡面新增一個查詢所有資料的方法(黃色背景處)
package com.app.mapper; import java.util.List; import org.apache.ibatis.annotations.Insert; import org.apache.ibatis.annotations.Options; import org.apache.ibatis.annotations.Select; import com.app.entity.User; public interface UserMapper { @Select("select * from tb_user where id = #{id}") User findUserById(Integer id); @Insert("insert into tb_user(userName, birth) values(#{userName}, #{birth})") @Options(useGeneratedKeys = true, keyProperty = "id") public Integer saveUser(User user); @Select("select * from tb_user") public List<User> findAllUser(); }
4、Service層
UserServer.java
package com.app.servcie; import java.util.List; import com.app.entity.User; public interface UserService { User findUserById(Integer id); Integer saveUser(User user); List<User> findAllUser(); }
UserServiceImp.java
package com.app.servcie; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.app.entity.User; import com.app.mapper.UserMapper; @Service(value = "userService") public class UserServiceImp implements UserService { @Autowired private UserMapper userMapper; @Override public Integer saveUser(User user) { return userMapper.saveUser(user); } @Override public User findUserById(Integer id) { return userMapper.findUserById(id); } @Override public List<User> findAllUser() { return userMapper.findAllUser(); } }
5、UserController,java新增一個查詢所有使用者資訊的介面(黃色背景處)
package com.app.controller; import java.util.ArrayList; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.ResponseBody; import com.app.entity.User; import com.app.servcie.UserService; import com.github.pagehelper.PageHelper; import com.github.pagehelper.PageInfo; @Controller public class UserController { @Autowired private UserService userService; @RequestMapping("/insertUser") @ResponseBody public User insertUser(User user) { userService.saveUser(user); User resultUser = userService.findUserById(user.getId()); return resultUser; } @RequestMapping("/getAllUser") @ResponseBody public List<User> getAllUser(@RequestParam(required = false, defaultValue = "1") Integer startPage, @RequestParam(required = false, defaultValue = "5") Integer PageSize) { PageHelper.startPage(startPage, PageSize); List<User> users = new ArrayList<>(); users = userService.findAllUser(); PageInfo<User> pi = new PageInfo<>(users); return users; } }
6、測試(查詢第2頁的5條資料)