mybatis物理分页的实现

2653885

　　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：

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

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 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 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

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 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： 

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。