mybatis物理分页的实现(转)

转：http://dove19900520.iteye.com/blog/1724414

最近两周一直在学习mybatis，昨天经理让我将mybatis的物理分页整理一下，打成一个jar包供以后调用。结果昨天我整了一天，也没整出个1、2、3来。现在终于写出来了，先记录下来再说，哈哈。

下面是所有的代码：

Java代码



package com.xxyd.mybatis.pojo;

import java.io.Serializable;

/**

* 实体类

* @author dove

*

*/

public class TestEntity implements Serializable{

private static final long serialVersionUID = -5849200248418883686L;

private int id ;

private String name;

private int no;

private int sex;

private int age;

private String count;

private String school;

private int weight;

private int height;

private String habbit;

private String memo;

public int getId() {

return id;

}

public void setId(int id) {

this.id = id;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public int getNo() {

return no;

}

public void setNo(int no) {

this.no = no;

}

public int getSex() {

return sex;

}

public void setSex(int sex) {

this.sex = sex;

}

public int getAge() {

return age;

}

public void setAge(int age) {

this.age = age;

}

public String getCount() {

return count;

}

public void setCount(String count) {

this.count = count;

}

public String getSchool() {

return school;

}

public void setSchool(String school) {

this.school = school;

}

public int getWeight() {

return weight;

}

public void setWeight(int weight) {

this.weight = weight;

}

public int getHeight() {

return height;

}

public void setHeight(int height) {

this.height = height;

}

public String getHabbit() {

return habbit;

}

public void setHabbit(String habbit) {

this.habbit = habbit;

}

public String getMemo() {

return memo;

}

public void setMemo(String memo) {

this.memo = memo;

}

@Override

public String toString() {

return "TestEntity [id=" + id + ", name=" + name + ", no=" + no

+ ", sex=" + sex + ", age=" + age + ", count=" + count

+ ", school=" + school + ", weight=" + weight + ", height="

+ height + ", habbit=" + habbit + ", memo=" + memo + "]";

}

}

2、DAO接口

Java代码



package com.xxyd.mybatis.dao;

import java.util.List;

import org.apache.ibatis.annotations.Param;

import com.xxyd.mybatis.pojo.TestEntity;

/**

* dao接口

* @author dove

*

*/

public interface TestMapper {

public void createTestEntity(TestEntity entity);

public List<TestEntity> getTestEntityByPager(@Param("pageNo")int pageNo,@Param("pageSize") int pageSize);

public List<TestEntity> getListTestEntity();

public int getTotalCount(@Param("pageNo")int pageNo,@Param("pageSize") int pageSize);

public void updateTestEntity(TestEntity entity);

public void deleteTestEntityById(@Param("id") int id);

}

3、映射文件TestMapper.xml

Xml代码



<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper SYSTEM "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >

<mapper namespace="com.xxyd.mybatis.dao.TestMapper">

<resultMap type="com.xxyd.mybatis.pojo.TestEntity" id="test_test">

<id property="id" column="id" javaType="int" jdbcType="INTEGER"/>

<result property="name" column="name" javaType="String" jdbcType="VARCHAR"/>

<result property="no" column="no" javaType="int" jdbcType="INTEGER"/>

<result property="sex" column="sex" javaType="int" jdbcType="INTEGER"/>

<result property="age" column="age" javaType="int" jdbcType="INTEGER"/>

<result property="count" column="count" javaType="String" jdbcType="VARCHAR"/>

<result property="school" column="school" javaType="String" jdbcType="VARCHAR"/>

<result property="weight" column="weight" javaType="int" jdbcType="INTEGER"/>

<result property="height" column="height" javaType="int" jdbcType="INTEGER"/>

<result property="habbit" column="habbit" javaType="String" jdbcType="VARCHAR"/>

<result property="memo" column="memo" javaType="String" jdbcType="VARCHAR"/>

</resultMap>

<insert id="createTestEntity" useGeneratedKeys="true" parameterType="com.xxyd.mybatis.pojo.TestEntity">

insert into test_test(name,no,sex, age,count,school,weight,height,habbit,memo)

values(#{name},#{no},#{sex},#{age},#{count},#{school},#{weight},#{height},#{habbit},#{memo});

</insert>

<select id="getTestEntityByPager" resultMap="test_test">

select id,name,no,sex, age,count,school,weight,height,habbit,memo

from test_test

limit #{pageNo, jdbcType=INTEGER} , #{pageSize, jdbcType=INTEGER}

</select>

<select id="getListTestEntity" resultMap="test_test">

select id,name,no,sex, age,count,school,weight,height,habbit,memo

from test_test

</select>

<select id="getTotalCount" resultType="int">

select count(sub.id) from

(select test.id as id from test_test test

limit #{pageNo, jdbcType=INTEGER} , #{pageSize, jdbcType=INTEGER}) as sub

</select>

<update id="updateTestEntity" parameterType="com.xxyd.mybatis.pojo.TestEntity">

update test_test

<set>

<if test="name != null and name != ''">

name = #{name , jdbcType=VARCHAR},

</if>

<if test="no != null and no != ''">

no = #{no , jdbcType=INTEGER},

</if>

<if test="sex != null and sex != ''">

sex = #{sex , jdbcType=INTEGER},

</if>

<if test="age != null and age != ''">

age = #{age , jdbcType=INTEGER},

</if>

<if test="count != null and count != ''">

count = #{count , jdbcType=VARCHAR},

</if>

<if test="school != null and school != ''">

school = #{school , jdbcType=VARCHAR},

</if>

<if test="weight != null and weight != ''">

weight = #{weight , jdbcType=INTEGER},

</if>

<if test="height != null and height != ''">

height = #{height , jdbcType=INTEGER},

</if>

<if test="habbit != null and habbit != ''">

habbit = #{habbit , jdbcType=VARCHAR},

</if>

<if test="memo != null and memo != ''">

memo = #{memo , jdbcType=VARCHAR},

</if>

</set>

where id = #{id ,jdbcType=INTEGER}

</update>

<delete id="deleteTestEntityById" parameterType="int">

delete from test_test where id = #{id}

</delete>

</mapper>

4、mybatis主配置文件mybatis-config.xml

Xml代码



<?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>

<!-- 配置数据库方言 目前只有mysql和oracle两种-->

<properties>

<property name="dialect" value="mysql"/>

</properties>

<!-- 配置mysql分页拦截器 start -->

<!-- com.xxyd.mybatis.interceptor.PaginationInterceptor 来自于jar包mybatis-pager-1.0.0.jar -->

<plugins>

<plugin interceptor="com.xxyd.mybatis.interceptor.PaginationInterceptor"></plugin>

</plugins>

<!-- 映射文件 -->

<mappers>

<mapper resource="com/xxyd/mybatis/mapper/TestMapper.xml" />

</mappers>

</configuration>

6、jdbc.properties文件

Xml代码



driverClass=com.mysql.jdbc.Driver

url=jdbc\:mysql\://127.0.0.1\:3306/student_manager

username=root

password=123456

7、spring配置文件部分配置

Xml代码



<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- Properties文件读取配置，base的properties -->

<context:property-placeholder location="classpath:jdbc.properties" />

<bean id="dataSource"

class="org.springframework.jdbc.datasource.DriverManagerDataSource">

<property name="driverClassName" value="${driverClass}" />

<property name="url" value="${url}" />

<property name="username" value="${username}"></property>

<property name="password" value="${password}"></property>

</bean>

<bean id="transactionManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

<property name="dataSource" ref="dataSource" />

</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">

<property name="configLocation" value="classpath:mybatis-config.xml" />

<property name="dataSource" ref="dataSource" />

</bean>

<!-- 测试用例start -->

<bean id="TestMapperTest" class="com.xxyd.mybatis.test.TestMapperTest">

<property name="sessionFactory" ref="sqlSessionFactory"/>

</bean>

<!-- 测试用例end -->

<!-- mapper bean -->

<bean id="TestMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">

<property name="mapperInterface" value="com.xxyd.mybatis.dao.TestMapper" />

<property name="sqlSessionFactory" ref="sqlSessionFactory" />

</bean>

</beans>

7、最后，测试类：

Java代码



package com.xxyd.mybatis.test;

import java.util.List;

import org.apache.ibatis.session.RowBounds;

import org.apache.ibatis.session.SqlSession;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.junit.Test;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.xxyd.mybatis.pojo.TestEntity;

public class TestMapperTest {

//private SqlSessionFactory sessionFactory;

private static SqlSessionFactoryBuilder builder;

private static SqlSessionFactory sessionFactory;

static {

builder = new SqlSessionFactoryBuilder();

sessionFactory = builder.build(Thread.currentThread()

.getContextClassLoader()

.getResourceAsStream("mybatis-config.xml"));

}

/**

* @param args

*/

public static void main(String[] args) {

ClassPathXmlApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");

TestMapperTest TestMapperTest = (TestMapperTest)ctx.getBean("TestMapperTest");

TestMapperTest.getList();

}

@Test

public void getList(){

SqlSession sqlSession = sessionFactory.openSession();

//TestEntity entity = new TestEntity();

List<TestEntity> list = sqlSession.selectList("com.xxyd.mybatis.dao.TestMapper.getListTestEntity", TestEntity.class, new RowBounds(0, 200));

sqlSession.commit();

sqlSession.close();

for (TestEntity testEntity : list) {

System.out.println(testEntity.toString());

}

}

//public SqlSessionFactory getSessionFactory() {

// return sessionFactory;

//}

//public void setSessionFactory(SqlSessionFactory sessionFactory) {

// this.sessionFactory = sessionFactory;

//}

}

能够成功运行的前提是，你已经将mybatis+spring的运行环境搭建好了，并且将mybatis-pager-1.0.0.jar也放置到classpath下。之后，直接运行测试类就可以了。

注意1：mybatis-pager-1.0.0.jar该包就是浪费我昨天一整天也没整出来的分页jar包，里面目前只适用于mysql和oracle两种数据库使用，其他的数据库还在研究中。

注意2：List<TestEntity> list = sqlSession.selectList("com.xxyd.mybatis.dao.TestMapper.getListTestEntity", TestEntity.class, new RowBounds(0, 200));
第一个参数标准写法是TestMapper.xml的名称空间+select的对应id（建议sql映射文件中的sql语句结尾不要有分号）；第二个参数是：实体类，当然也可以使字符串，只有是Object类型的就可以，目前还没发现什么异常，或许我研究的较为浅显的原因；第三个参数则是需要分页的数据。