Java框架之MyBatis 07-动态SQL-缓存机制-逆向工程-分页插件

    <select id="getBook" resultType="main.beans.Book">
        SELECT id,title,author,price
        FROM books
        <where>
            <if test="id != null"> and id= #{id}</if>
            <if test="title != null"> and title = #{title}</if>
        </where>
    </select>

    <delete id="deleteBook">
        DELETE FROM books
        <trim prefix="WHERE" suffixOverrides="and">
            <if test="id != null">id = #{id} and</if>
            <if test="title != null">itle = #{title} and</if>
        </trim >
    </delete>

    <update id="updateBook">
        UPDATE books
        <set>
            <if test="title != null">title = #{title},</if>
            <if test="author != null">author = #{author},</if>
        </set>
        where id = #{id}
    </update>

    <sql id="bookFields">
        id,title,author,price,sales,stock,img_path
    </sql>
    <insert id="insertBook" useGeneratedKeys="true" keyProperty="id">
        INSERT INTO books (<include refid="bookFields"></include>)
        VALUES(#{id},#{title},#{author},#{price},#{sales},#{stock},#{imgPath})
    </insert>

    <select id="selectBookPrice" resultType="main.beans.Book">
        SELECT <include refid="bookFields"></include>
        FROM books
        <where>
            <choose>
                <when test="id != null">id = #{id}</when>
                <otherwise>price > #{price}</otherwise>
            </choose>
        </where>
    </select>

    <select id="getBooks" resultType="main.beans.Book">
        SELECT <include refid="bookFields"></include>
        FROM books where id in
        <foreach collection="ids" item="id" separator="," open="(" close=")" >
            #{id}
        </foreach>
    </select>

　　　　　　<cache type="org.mybatis.caches.ehcache.EhcacheCache"></cache>

<?xml version="1.0" encoding="UTF-8"?>
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="../config/ehcache.xsd">
 <!-- 磁盘保存路径 -->
 <diskStore path="F:\code\mysql\ehcache" />
 <defaultCache 
   maxElementsInMemory="1000" 
   maxElementsOnDisk="10000000"
   eternal="false" 
   overflowToDisk="true" 
   timeToIdleSeconds="120"
   timeToLiveSeconds="120" 
   diskExpiryThreadIntervalSeconds="120"
   memoryStoreEvictionPolicy="LRU">
 </defaultCache>
</ehcache>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!--
            targetRuntime: 执行生成的逆向工程的版本
                  MyBatis3Simple: 生成基本的CRUD
                  MyBatis3: 生成带条件的CRUD
   -->
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!--        数据库连接设置-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/bookstore?allowMultiQueries=true"
                        userId="root"
                        password="12345">
        </jdbcConnection>
        <!-- javaBean的生成策略 bean的存放路径-->
        <javaModelGenerator targetPackage="main.beans" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- SQL映射文件的生成策略 mapper.xml文件路径-->
        <sqlMapGenerator targetPackage="main.mapper" targetProject=".\conf">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- Mapper接口的生成策略 mapper接口路径-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="main.mapper" targetProject=".\src">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 逆向分析的表 表名对应的javaBean名-->
        <table tableName="books" domainObjectName="Book"></table>
        <table tableName="users" domainObjectName="User"></table>
    </context>
</generatorConfiguration>

    @Test
    public void testMbg() throws Exception {
        List<String> warnings = new ArrayList<String>();
        boolean overwrite = true;
        File configFile = new File("mbg.xml");
        ConfigurationParser cp = new ConfigurationParser(warnings);
        Configuration config = cp.parseConfiguration(configFile);
        DefaultShellCallback callback = new DefaultShellCallback(overwrite);
        MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,callback, warnings);
        myBatisGenerator.generate(null);
    }

    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>

        Page<Book> page = PageHelper.startPage(3,2 );
        List<Book> books = mapper.selectByExample(bookExample);
        //查询出当前为第3页，每页显示2条的图书信息，其还可得到更多页码相关值
        books.forEach((book -> System.out.println("book = " + book)));
        PageInfo<Book> info = new PageInfo<>(books,3);
        System.out.println("=============获取详细分页相关的信息=================");
        System.out.println("当前页: " + info.getPageNum());
        System.out.println("总页码: " + info.getPages());
        System.out.println("总条数: " + info.getTotal());
        System.out.println("每页显示的条数: " + info.getPageSize());
        System.out.println("是否是第一页: " + info.isIsFirstPage());
        System.out.println("是否是最后一页: " + info.isIsLastPage());
        System.out.println("是否有上一页: " + info.isHasPreviousPage());
        System.out.println("是否有下一页: " + info.isHasNextPage());
        System.out.println("============分页逻辑===============");
        int[] nums = info.getNavigatepageNums();
        for (int num : nums) {
            System.out.println("num = " + num);
        }