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:
- 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。