详解mybatis collection标签一对多的使用

查询， 结果集为AssociatedInfo：

<select resultMap='AssociatedInfo'> SELECT r.requisition_number AS business_code, r.id AS header_id, r.document_type_id AS reportTypeId, r.applicant_id as employeeId FROM fec_expense.exp_report_payment_schedule b,fec_expense.exp_report_header r WHERE b.exp_report_header_id=r.id and r.`status`=1004 and b.frozen_flag ='Y' and r.applicant_id=#{applicationId} <if test='reportNumber!=null and reportNumber != ’’'> AND r.requisition_number LIKE concat( ’%’, concat(#{reportNumber,jdbcType=VARCHAR}, ’%’)) </if> <if test='documentTypeId !=null and reportNumber != ’’'> AND r.document_type_id = #{documentTypeId} </if> <if test='formTypes != null and formTypes.size > 0'> AND r.document_type_id IN <foreach collection='formTypes' item='formId' open='(' separator=',' close=')'>#{formId} </foreach> </if> AND ( b.amount - ( SELECT COALESCE(sum( c.write_off_amount ), 0) AS write_off_amount FROM csh_write_off c WHERE c.document_header_id = b.exp_report_header_id AND c.document_line_id = b.id AND ( c.STATUS = ’Y’ OR ( c.STATUS = ’P’ AND c.operation_type = ’WRITE_OFF’ ) ) ) - ( SELECT COALESCE(sum( a.amount ), 0) AS commit_amount FROM csh_data_relation_acp a WHERE a.report_head_id = b.exp_report_header_id AND a.report_line_id = b.id AND a.document_type = ’ACP_REQUISITION’ ) > 0 ) GROUP BY r.requisition_number, b.exp_report_header_id, r.document_type_id, b.applicant_id ORDER BY r.requisition_number </select>

结果集 AssociatedInfo: 使用collection 实现1对多的场景, CashDataPublicReportHeaderDTO实体里包含一个行的集合List<CashDataPublicReportLineDTO> lines：

<resultMap type='com.hand.hcf.app.payment.web.dto.CashDataPublicReportHeaderDTO'> <result column='header_id' property='reportHeadId'/> <result column='business_code' property='reportNumber'/> <result column='form_name' property='reportTypeName'/> <collection property='lineList' column='{headerId=header_id}' ofType='ArrayList' select='getPaymentInfo'/> </resultMap> <select resultType='com.hand.hcf.app.payment.web.dto.CashDataPublicReportLineDTO'> SELECTtemp.id scheduleLineId,'' AS cshTransactionId,temp.amount,temp.associated_amount associatedAmount,(temp.amount - temp.associated_amount - (SELECT COALESCE( sum( c.write_off_amount ), 0 ) AS write_off_amountFROMcsh_write_off cWHEREc.document_header_id = temp.exp_report_header_idAND c.document_line_id = temp.idAND c.document_type = 'PUBLIC_REPORT'AND ( c.STATUS = ’Y’ OR ( c.STATUS = ’P’ AND c.operation_type = ’WRITE_OFF’ ) ))) AS availableAmount,temp.exp_report_header_id expReportHeaderId,0 AS scheduleLineNumber,temp.company_id companyId,temp.currency_code currency,temp.description description,temp.exchange_rate exchangeRate,temp.payment_schedule_date schedulePaymentDate,temp.payment_method paymentMethod,temp.payment_type,temp.prop_flag prop_flag,temp.csh_transaction_class_id cshTransactionClassId,( SELECT ctc.description FROM csh_transaction_class ctc WHERE ctc.id = temp.csh_transaction_class_id ) AS cshTransactionClassName,temp.cash_flow_item_id cashFlowItemId,temp.payee_category payeeCategory,temp.payee_id payeeId,temp.account_number accountNumber,temp.account_name accountName,temp.bank_code bankCode,temp.bank_name bankName,temp.bank_code bankLocationCode,temp.bank_name bankLocationName,'' provinceCode,'' provinceName,''cityCode,'' cityName, (select c.type_code from csh_transaction_class c where c.id=temp.csh_transaction_class_id ) cshTransactionTypeCode,''contractHeaderIdFROM(SELECT b.*,(SELECT COALESCE( sum( a.amount ), 0 ) AS associated_amountFROMcsh_data_relation_acp aWHEREa.report_head_id = b.exp_report_header_idAND a.report_line_id = b.idAND a.document_type = ’ACP_REQUISITION’) AS associated_amountFROMfec_expense.exp_report_payment_schedule b ,fec_expense.exp_report_header rWHEREb.frozen_flag = 'Y'and b.exp_report_header_id=r.idAND b.exp_report_header_id = #{headerId}) temp </select>

包含列表的实体类 CashDataPublicReportHeaderDTO ：

package com.hand.hcf.app.payment.web.dto; import com.fasterxml.jackson.databind.annotation.JsonSerialize;import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;import lombok.Data; import java.time.ZonedDateTime;import java.util.List; @Datapublic class CashDataPublicReportHeaderDTO { @JsonSerialize(using = ToStringSerializer.class) private Long reportHeadId;//报账单头ID private String reportNumber;//报账单编号 private String reportTypeName;//报账单类型 @JsonSerialize(using = ToStringSerializer.class) private Long reportTypeId;// 报账单类型ID private List<CashDataPublicReportLineDTO> lineList;//报账单计划付款行 @JsonSerialize(using = ToStringSerializer.class) private Long employeeId;//员工ID private String employeeName;//员工名称 private ZonedDateTime requisitionDate; // 申请日期}

总结

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