JAVA中的iBATIS可以很方便的对数据库进行增删改、查询
最近在用iBATIS，这里列出一些我认为比较好的地方：

1、增加记录时返回随机生成的主键值：
 <insert id="insertIntoDB" parameterClass="BepsContract">
   <selectKey resultClass="int" keyProperty="contractPk">
   SELECT BEPS_CONTRACT_PK.NEXTVAL FROM DUAL
  </selectKey>
  insert into NCS_BEPS_CONTRACT (CONTRACT_NO,ACK_NO,PAYER_NAME,PAYER_ACCOUNT,PAYEE_NAME,PAYEE_ACCOUNT,ACK_FLAG,DIRECTION,BRANCH_ID,PROCESS_STATUS,CREATE_ON,CREATE_BY,MODIFY_ON,MODIFY_BY,TYPE_ID,TYPE_DESC,CONTRACT_PK,type,SDN_STATUS,DDA_STATUS,LOAD_FILE_NAME,TXN_REF_NO,DESTINATION,EXPIRY_DATE,PAYER_BANKCODE,PAYER_BRANCH_CODE,PAYEE_BANKCODE,PAYEE_BRANCH_CODE,BUYER_SUBSCRIPTION_REF,MERCHANT_ID,TXN_CYCLE,PAYER_BANKNAME,PAYEE_BANKNAME,TXN_AMOUNT_LIMIT,CUMULATIVE_AMOUNT_LIMIT,TXN_COUNT_LIMIT,IS_FROM_BACKEND)
     values (
     #contractNo:VARCHAR#,
     #ackNo:VARCHAR#,
     #payerName:VARCHAR#,
     #payerAccount:VARCHAR#,
     #payeeName:VARCHAR#,
     #payeeAccount:VARCHAR#,
     #ackFlag:VARCHAR#,
     #direction:VARCHAR#,
     #branchId:VARCHAR#,
     #processStatus:VARCHAR#,
     SYSDATE,
     #createBy:VARCHAR#,
     SYSDATE,
     #modifyBy:VARCHAR#,
     #typeId:VARCHAR#,
     #typeDesc:VARCHAR#,
     #contractPk:NUMERIC#,
     #type:VARCHAR#,
              #sdnStatus:VARCHAR#,
     #ddaStatus:VARCHAR#,
     #loadFileName:VARCHAR#,
     #txnRefNo:VARCHAR#,
     #destination:VARCHAR#,
     #expiryDate:DATE#,
     #payerBankcode:VARCHAR#,
     #payerBranchCode:VARCHAR#,
     #payeeBankcode:VARCHAR#,
     #payeeBranchCode:VARCHAR#,
     #buyerSubscriptionRef:VARCHAR#,
     #merchantId:VARCHAR#,
     #txnCycle:VARCHAR#,
     #payerBankname:VARCHAR#,
     #payeeBankname:VARCHAR#,
              #txnAmountLimit:DOUBLE#,
     #cumulativeAmountLimit:DOUBLE#,
     #txnCountLimit:NUMERIC#,
     #isFromBackend:VARCHAR#
  )
 </insert>

2、一些特殊的查询：
 <select id="selectIncomingTimeDebitPkg" resultClass="java.util.HashMap" parameterClass="CondPkgheadTo">
  select B.*, FLOOR((select WORKING_DAY from NCS_BEPS_MBFE_STATUS where BRANCH_ID = #branchId:VARCHAR#) - B.CONSIGNED_DATE) AS REMAIN_DAYS
  from NCS_BEPS_PKGHEAD B
        where MSG_CODE = #msgCode:VARCHAR# and
                 BRANCH_ID = #branchId:VARCHAR# and
     package_head_pk in (select package_head_pk from ncs_beps_txn_in where
         MSG_CODE = #msgCode:VARCHAR# and
         BRANCH_ID = #branchId:VARCHAR# and
         GROUP_ID = #groupId:VARCHAR#
       <isNotNull property="processStatusList">
       <iterate prepend="and" property="processStatusList" open="(" close=")" conjunction="or">     
        PROCESS_STATUS =( #processStatusList[]# )
       </iterate>
       </isNotNull>
     )
           <iterate prepend = "and" property = "msgProcessStatusList" open = " (" close = ") " conjunction = "or">     
              MSG_PROCESS_STATUS = ( #msgProcessStatusList[]# )
              </iterate>  
    <isNotNull property="searchFailStatus" prepend="and">
     <![CDATA[ BEPS_STATUS <> 'BACK00' ]]>
    </isNotNull>
 </select>