mybatis与spring的整合(使用sqlSession进行crud)

上次介绍了用接口的方法极大的节省了dao层，只需通过 配置文件和接口就可以实现，这次介绍的是通过splsession来实现dao，这种方法比较灵活；

先不说，上配置文件：

1、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app  xmlns="http://xmlns.jcp.org/xml/ns/javaee"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
          version="3.1">

  <display-name>Archetype Created Web Application</display-name>

    <!--引入spring-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:application.xml</param-value>
    </context-param>

    <!--springmvc DispathcherServlet-->
    <servlet>
        <servlet-name>action</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>action</servlet-name>
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>

</web-app>

2、application.xml

<?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: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.xsd
                            http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx.xsd
                            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

    <!--spring注解-->
    <context:component-scan base-package="com.seven"/>

    <!-- 导入外部的配置文件 -->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="jdbcUrl" value="${jdbcUrl}"/>
        <property name="driverClass" value="${driverClass}"/>
        <property name="user" value="${user}"/>
        <property name="password" value="${password}"/>
    </bean>

    <!--mybatis 的 sqlsessionFactoryNean-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
      <!--  <property name="configLocation" value="classpath:conf.xml"/>-->
        <property name="mapperLocations" value="classpath:com/seven/dao/*.xml"/>
        <property name="typeAliasesPackage" value="com.seven.domain"/><!--指定实体类包，自动将实体类的简单类名映射为别名-->
    </bean>

    <!--映射器接口  有了 下面配置就不用了-->
   <!-- <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
        <property name="mapperInterface" value="com.seven.dao.UserMapper"/>
    </bean>-->

    <!--mybatis自动扫描加载映射接口:mapperScannerConfigurer-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.seven.dao"/><!--指定映射接口所在的包-->
       <!-- <property name="sqlSessionFactory" ref="sqlSessionFactory"/>-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
     </bean>

    <!--事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

   <!-- <context:component-scan base-package="com.seven.*">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>-->

    <!--声明事务-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

</beans>

3.sprin-mvc.xml

<?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:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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">

    <!--spring注解扫描包-->
    <context:component-scan base-package="com.seven"/>

    <!--springmvc注解驱动-->
    <mvc:annotation-driven/>

    <!-- 资源管理 -->
    <mvc:resources location="/resources/" mapping="/resources/**"/>
    <mvc:resources location="/upload/" mapping="/upload/**"/>

    <!-- 上传文件解析器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485670"/> <!-- 10M -->
    </bean>

    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/admin/**"/>
            <mvc:exclude-mapping path="/admin/loginUI.action"/>
            <mvc:exclude-mapping path="/admin/managerLogin.action"/>
            <mvc:exclude-mapping path="/admin/validateManager.action"/>
            <bean class="com.seven.interceptor.CheckLoginInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>

    <!--内部资源解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".html"/>
    </bean>

</beans>

4、相关配置文件

　　jdbc.properties

jdbcUrl=jdbc:mysql://localhost:3306/db_articlemanage
driverClass=com.mysql.jdbc.Driver
user=root
password=root

5、javabean

例如User

package com.seven.domain;

import org.apache.ibatis.type.Alias;

import java.io.Serializable;
import java.util.Set;

/**
 * Created by Seven on 2015/5/29.
 */

public class User implements Serializable{

    private Long id;
    private String loginname;
    private String username;
    private String password;
    private String intro;

    private Set<Role> roles;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getLoginname() {
        return loginname;
    }

    public void setLoginname(String loginname) {
        this.loginname = loginname;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getIntro() {
        return intro;
    }

    public void setIntro(String intro) {
        this.intro = intro;
    }

    public Set<Role> getRoles() {
        return roles;
    }

    public void setRoles(Set<Role> roles) {
        this.roles = roles;
    }

}

User对应的mapper

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--使用mapper编程的时候，namespace必须是接口的全类名  -->
<mapper namespace="User">

    <!--user结果映射-->
    <resultMap id="userResult" type="User">
        <result column="id" property="id"/>
        <result column="loginname" property="loginname"/>
        <result column="username" property="username"/>
        <result column="password" property="password"/>
        <result column="intro" property="intro"/>

    </resultMap>

    <!-- 取得插入数据后的id -->
    <insert id="insert" parameterType="map">
        insert into tb_user(loginname,username,password,intro)
        values(#{loginname},#{username},#{password},#{intro})
    </insert>

    <update id="update">
        update tb_user
        set loginname = #{loginname},
        username = #{username},
        password = #{password},
        intro = #{intro}
        where id = #{id}
    </update>

    <delete id="delete">
        delete from tb_user
        where id = #{id}
    </delete>

    <select id="findById" resultMap="userResult">
        select *
        from tb_user
        where id = #{id}
    </select>

    <select id="findAll" resultMap="userResult">
        select *
        from tb_user
    </select>

    <select id="findByIds" resultMap="userResult">
        select *
        from tb_user
        where id IN (#{ids})
    </select>

    <select id="getPage" resultMap="userResult" parameterType="map">
        select *
        from tb_user
        LIMIT #{startIndex},#{pageSize}
    </select>

    <select id="findByloginnameAndPwd" resultMap="userResult">
        SELECT *
        FROM tb_user
        WHERE loginname=#{loginname}
        AND password=#{password}
    </select>

</mapper>

7.queryhepler

package com.seven.utils;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by Seven on 2015/6/12.
 */
public class QueryHelper {

    private String nameSpace;
    private String methodId;
    private Object param;
    private Map<String,Object> params;

    /**
     * 设置命名空间.
     * @param nameSpace
     * @return
     */
    public QueryHelper setNameSpace(String nameSpace){
        this.nameSpace = nameSpace;
        return this;
    }

    /**
     * 设置dao方法的ID.
     * @param methodId
     * @return
     */
    public QueryHelper setMethodId(String methodId){
        this.methodId = methodId;
        return this;
    }

    /**
     * 设置一个参数.
     * @param param
     * @return
     */
    public QueryHelper setParam(Object param){
        this.param = param;
        return this;
    }

    /**
     * 设置多个参数.
     * @param key
     * @param value
     * @return
     */
    public QueryHelper setParams(String key,Object value){
        if(params == null){
            params = new HashMap<String, Object>();
        }
        params.put(key,value);
        return this;
    }

    /**
     * 获取一个参数.
     * @return
     */
    public Object getParam(){
        return param;
    }

    /**
     * 获得多个参数.
     * @return
     */
    public Map<String,Object> getParams(){
        return params;
    }

    /**
     * 获取非空的参数.
     * @return
     */
    public Object getRealParams(){
        return param == null ? params : param;
    }

    /**
     * 得到结果.
     * @return
     */
    public String getMethod(){
        return nameSpace+"."+methodId;
    }

}

8、daoSupport和daoSupportImpl

　　daosupport

package com.seven.base;

import com.seven.utils.QueryHelper;

import java.util.List;
import java.util.Map;

/**
 * Created by Seven on 2015/6/12.
 */
public interface DaoSupport {

    public void insert(QueryHelper queryHelper);

    public void insert(String method,Object param);

    public void delete(QueryHelper queryHelper);

    public void delete(String method,Object o);

    public void update(QueryHelper queryHelper);

    public void update(String method,Object o);

    public<T> T select(QueryHelper queryHelper);

    public<T> T select(String method,Object o);

    public<T> List<T> selectList(QueryHelper queryHelper);

    public<T> List<T> selectList(String method,Object o);

    public<T> List<T> getPageData(int pageNum,int pageSize,QueryHelper queryHelper);
}

　　daosupportImpl

package com.seven.base;

import com.seven.utils.QueryHelper;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import javax.annotation.Resource;
import java.lang.reflect.ParameterizedType;
import java.util.List;
import java.util.Map;

/**
 * Created by Seven on 2015/6/12.
 */

@Repository("daoSupport")
@Transactional
public class DaoSupportImpl implements DaoSupport{

    @Resource
    private SqlSessionFactory sqlSessionFactory;

    private SqlSession sqlSession = null;

    /**
     * 获取sqlSession.
     * @return
     */
    public SqlSession getSqlSession(){
        if(sqlSession==null){
            sqlSession = sqlSessionFactory.openSession();
        }
        return sqlSession;
    }

    /**
     * 插入.
     * @param queryHelper
     */
    public void insert(QueryHelper queryHelper) {
        getSqlSession().insert(queryHelper.getMethod(),queryHelper.getRealParams());
    }

    /**
     * 插入.
     * @param method
     * @param param
     */
    public void insert(String method, Object param) {
        getSqlSession().insert(method,param);
    }

    /**
     * 删除.
     * @param queryHelper
     */
    public void delete(QueryHelper queryHelper) {
        getSqlSession().delete(queryHelper.getMethod(),queryHelper.getRealParams());
    }

    /**
     * 删除.
     * @param method
     * @param o
     */
    public void delete(String method, Object o) {
        getSqlSession().delete(method,o);
    }

    /**
     * 更新.
     * @param queryHelper
     */
    public void update(QueryHelper queryHelper) {
        getSqlSession().update(queryHelper.getMethod(),queryHelper.getRealParams());
    }

    /**
     * 更新.
     * @param method
     * @param o
     */
    public void update(String method, Object o) {
        getSqlSession().update(method,o);
    }

    /**
     * 查找一个.
     * @param queryHelper
     * @param <T>
     * @return
     */
    public <T> T select(QueryHelper queryHelper) {
        return getSqlSession().selectOne(queryHelper.getMethod(),queryHelper.getRealParams());
    }

    /**
     * 查找一个.
     * @param method
     * @param o
     * @param <T>
     * @return
     */
    public <T> T select(String method, Object o) {
        return getSqlSession().selectOne(method,o);
    }

    /**
     * 查找多个.
     * @param queryHelper
     * @param <T>
     * @return
     */
    public <T> List<T> selectList(QueryHelper queryHelper) {
        return getSqlSession().selectList(queryHelper.getMethod(),queryHelper.getRealParams());
    }

    /**
     * 查找多个.
     * @param method
     * @param o
     * @param <T>
     * @return
     */
    public <T> List<T> selectList(String method, Object o) {
        return getSqlSession().selectList(method,o);
    }

    /**
     * 查找所有.
     * @param method
     * @param <T>
     * @return
     */
    public <T> List<T> selectWithoutParams(String method) {
        return getSqlSession().selectList(method);
    }

    /**
     * 分页数据.
     * @param pageNum
     * @param pageSize
     * @param queryHelper
     * @param <T>
     * @return
     */
    public <T> List<T> getPageData(int pageNum, int pageSize, QueryHelper queryHelper) {
        return null;
    }
}

9、通过以上配置与实现，我们就可以很简单的操作数据库了：

　　其中查询帮助类是用来帮助查询，其原理就是拼接命名空间，设置参数，方便查询

　　例如，查询分页数据

 /**
     * 获取分页数据.
     * @param pageNum
     * @return
     */
    public Page getPageData(int pageNum){
        int totleRecord = daoSupport.select("Article.getTotleRecord",null);
        Page page = new Page(pageNum, Configuration.pageSize,totleRecord);
        QueryHelper helper = new QueryHelper();
        helper.setNameSpace("Article")
                .setMethodId("getPageData")
                .setParams("startIndex",page.getStartIndex())
                .setParams("pageSize",page.getPageSize());
        List list = daoSupport.selectList(helper);
        page.setList(list);
        return page;
    }

天生不会写东西，但是很想分享给大家，有什么问题请大家指出！