什么是 MyBatis ？

MyBatis 是支持定制化 SQL、存储过程以及高级映射的优秀的持久层框架。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以对配置和原生Map使用简单的 XML 或注解，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。

表：market_plan(营销计划(关联了用户))

market_plan_product(产品关联营销计划)
market_plan_label(标签关联营销计划)
market_plan_ideadata(创意素材关联营销计划)
user_ideadata_activity(活动关联用户，活动关联创意素材表)
user(用户表)

配置原则：A关联B，将A的resultMap关联(association)到B的resultMap中，这样才能在写关联查询sql语句的时候，查询出A,B表中的属性。多张表的关联也是一样的道理！

配置xml示例：

<resultMap id="userResultMap" type="com.mchuan.fastmarketplat.b.entity.User"><id column="USER_ID" property="id" /><result column="ACCOUNT" property="account" /><result column="NAME" property="name" /><result column="MOBILE" property="mobile" /></resultMap><resultMap id="labelResultMap"type="com.mchuan.fastmarketplat.b.entity.MarketPlanLabel"><id property="id" column="LABEL_ID" /><result property="gender" column="GENDER" /><result property="area" column="AREA" /><result property="age" column="AGE" /><result property="deviceType" column="DEVICE_TYPE" /><result property="communicationFee" column="COMMUNICATION_FEE" /><result property="actionLabels" column="ACTION_LABELS" /><result property="netScene" column="NET_SCENE" /></resultMap><resultMap id="productResultMap"type="com.mchuan.fastmarketplat.b.entity.MarketPlanProduct"><id property="id" column="PRODUCT_ID" /><result property="coverAmount" column="COVER_AMOUNT" /></resultMap><resultMap id="activityResultMap"type="com.mchuan.fastmarketplat.b.entity.UserActivity"><id column="AC_ID" property="id" /><result column="ACTIVITY_ID" property="activityId" jdbcType="INTEGER" /><result column="COVER_URL" property="coverUrl" jdbcType="VARCHAR" /><result column="ACTIVITY_URL" property="activityUrl" jdbcType="VARCHAR" /><result column="VIEW_URL" property="viewUrl" jdbcType="VARCHAR" /><result column="CREATE_TIME" property="createTime" /><result column="UPDATE_TIME" property="updateTime" /></resultMap><resultMap id="ideaDataResultMap"type="com.mchuan.fastmarketplat.b.entity.MarketPlanIdeaData"><id property="id" column="IDEA_DATA_ID" /><result property="content" column="CONTENT" /><result property="linkUrl" column="LINK_URL" /><!-- ideaData关联属性 --><association property="userActivity"javaType="com.mchuan.fastmarketplat.b.entity.UserActivity" resultMap="activityResultMap" /></resultMap><resultMap id="BaseResultMap" type="com.mchuan.fastmarketplat.b.entity.MarketPlan"><id column="ID" property="id" jdbcType="INTEGER" /><result column="PLAN_NAME" property="planName" jdbcType="VARCHAR" /><result column="BUDGET" property="budget" jdbcType="DECIMAL" /><result column="ACTUAL_BUDGET" property="actualBudget"jdbcType="DECIMAL" /><result column="DEMAND_TYPE" property="demandType" jdbcType="VARCHAR" /><result column="START_DATE" property="startDate" /><result column="END_DATE" property="endDate" /><result column="CREATE_STATUS" property="createStatus"jdbcType="INTEGER" /><result column="CREATE_TIME" property="createTime" /><result column="UPDATE_TIME" property="updateTime" /><result column="NOTE" property="note" jdbcType="VARCHAR" /><result column="STATUS" property="status" jdbcType="INTEGER" /><result column="DESTPAGE_URL" property="destpageUrl" jdbcType="VARCHAR" /><result column="IS_AWARD" property="isAward" jdbcType="INTEGER" /><result column="AWARD_MONEY" property="awardMoney" jdbcType="DECIMAL" /><result column="ADVERTISER" property="advertiser" jdbcType="VARCHAR" /><result column="INDUSTRY" property="industry" jdbcType="INTEGER" /><!-- marketPlan关联属性 --><association property="user"javaType="com.mchuan.fastmarketplat.b.entity.User" resultMap="userResultMap" /><association property="marketPlanLabel"javaType="com.mchuan.fastmarketplat.b.entity.MarketPlanLabel"resultMap="labelResultMap" /><association property="marketPlanProduct"javaType="com.mchuan.fastmarketplat.b.entity.MarketPlanProduct"resultMap="productResultMap" /><association property="marketPlanIdeaData"javaType="com.mchuan.fastmarketplat.b.entity.MarketPlanIdeaData"resultMap="ideaDataResultMap" /></resultMap>

以上所述是小编给大家介绍的 Mybatis 中的一对一，一对多，多对多的配置原则示例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！