mybatis使用经验是怎样的

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@Param的使用

Java代码中指定@Param("model")，mapper.xml配置中也需要

	List<ProductInfo> queryByPage(@Param("model") ProductQueryReq queryModel);

 <select id="queryByPage" resultMap="BaseResultMap">
    select 
    <include refid="Base_Column_List" />
    from product_info
    where is_deleted='N'
    <if test= "model.productStatus != null">
        and  status = #{model.productStatus,jdbcType=INTEGER}
    </if>
  </select>

mapper.xml中不写则启动报错：

BoundSql.getParameterObject()： 

只有一个参数可以不指定@Param， 且mapper.xml中可直接用对象属性

List<ProductInfo> queryByPage(ProductQueryReq queryModel);

如果mapper.xml用了别名报错：

有多个相同类型参数也需要定义@Param

	UserImageTransfer selectFirstHistoryOrcInfo(String productCode, String userId);

collection的用法

collection 下 主表 和附表 都需要查出主键；即使<id>标签写了其他字段也没用，一定是数据库表真实的主键.

<resultMap id="BaseResultMap" type="com.noob.domain.CmbClaimPackage" >
    <id column="id" property="id" jdbcType="BIGINT" />
    <result column="batch_no" property="batchNo" jdbcType="VARCHAR" />
    <result column="product_code" property="productCode" jdbcType="VARCHAR" />
    <result column="package_no" property="packageNo" jdbcType="VARCHAR" />
    <result column="serial_no" property="serialNo" jdbcType="VARCHAR" />
    <result column="amount" property="amount" jdbcType="DECIMAL" />
    <result column="total_count" property="totalCount" jdbcType="DECIMAL" />
    <result column="origin_info" property="originInfo" jdbcType="VARCHAR" />
    <result column="trade_status" property="tradeStatus" jdbcType="INTEGER" />
    <result column="return_info" property="returnInfo" jdbcType="VARCHAR" />
    <result column="upload_sign" property="uploadSign" jdbcType="CHAR" />
    <result column="last_upload_date" property="lastUploadDate" jdbcType="VARCHAR" />
    <result column="remark" property="remark" jdbcType="VARCHAR" />
    <result column="creator" property="creator" jdbcType="VARCHAR" />
    <result column="gmt_created" property="gmtCreated" jdbcType="TIMESTAMP" />
    <result column="modifier" property="modifier" jdbcType="VARCHAR" />
    <result column="gmt_modified" property="gmtModified" jdbcType="TIMESTAMP" />
    <result column="is_deleted" property="isDeleted" jdbcType="CHAR" />
  </resultMap>

	<resultMap id="PackageModelResultMap" type="com.noob.model.CmbClaimPackageModel" extends="BaseResultMap">
		<collection property="detailList" javaType="list" ofType="com.noob.domain.CmbClaimDetail">
	        <id column="d_id" property="id" jdbcType="BIGINT" />
	        <result  column="d_batch_no" property="batchNo" jdbcType="VARCHAR" />
	        <result  column="d_product_code" property="productCode" jdbcType="VARCHAR" />
		    <result column="d_amount" property="amount" jdbcType="DECIMAL" />
		    <result column="d_package_no" property="packageNo" jdbcType="VARCHAR" />
		    <result column="d_contract_no" property="contractNo" jdbcType="VARCHAR" />
            <result column="d_policy_no" property="policyNo" jdbcType="VARCHAR" />
            <result column="d_serial_no" property="serialNo" jdbcType="VARCHAR" />
		    <result column="d_trade_no" property="tradeNo" jdbcType="VARCHAR" />
		    <result column="d_report_amount" property="reportAmt" jdbcType="DECIMAL" />
		    <result column="d_trade_status" property="tradeStatus" jdbcType="INTEGER" />
		    <result column="d_resp_code" property="respCode" jdbcType="VARCHAR" />
		    <result column="d_resp_msg" property="respMsg" jdbcType="VARCHAR" />
		    <result column="d_report_no" property="reportNo" jdbcType="VARCHAR" />
		    <result column="d_claim_no" property="claimNo" jdbcType="VARCHAR" />
		    <result column="d_return_info" property="returnInfo" jdbcType="VARCHAR" />
		    <result column="d_agreed_repay_date" property="agreedRepayDate" jdbcType="VARCHAR" />
		    <result column="d_gmt_created" property="gmtCreated" jdbcType="TIMESTAMP" />
		</collection>
	</resultMap>


<select id="selectDoing" resultMap="PackageModelResultMap" parameterType="java.util.Date" >
    select  p.id,
            p.batch_no, 
            p.serial_no, 
            p.product_code, 
            p.package_no, 
            p.amount, 
            p.origin_info,  
            p.trade_status,  
            p.return_info,  
            d.id d_id,
            d.product_code d_product_code,
            d.package_no d_package_no,
            d.batch_no  d_batch_no,
            d.serial_no d_serial_no, 
            d.amount  d_amount, 
            d.contract_no d_contract_no, 
            d.policy_no  d_policy_no, 
            d.trade_no d_trade_no, 
            d.report_amount d_report_amount, 
            d.trade_status d_trade_status, 
            d.resp_code d_resp_code, 
            d.resp_msg d_resp_msg, 
            d.report_no d_report_no, 
            d.claim_no  d_claim_no, 
            d.agreed_repay_date d_agreed_repay_date,
            d.gmt_created d_gmt_created,
            d.return_info d_return_info
         from cmb_creditcard_claim_package p inner join cmb_creditcard_claim_detail d on p.batch_no = d.batch_no
           where   p.gmt_created >= #{beginDate,jdbcType=TIMESTAMP} 
                   and  <include refid="doing_condition"/>
                   and  <include refid="alive_condition"/>
  </select>

以上就是mybatis使用经验是怎样的，小编相信有部分知识点可能是我们日常工作会见到或用到的。希望你能通过这篇文章学到更多知识。更多详情敬请关注亿速云行业资讯频道。