iBatis中使用动态查询

iBatis中的动态查询还是比较好用的

如果想深入学习，可以参考 Manning.iBATIS.in.Action.Jan.2007

下面给出几个例子和dtd定义：

<select id="selectDispatchedKey" parameterClass="KeyAndKeyFlowInfo" resultMap="KeyAndKeyFlowResult">
   select distinct
    KEY_ID,
    USER_ID,
    INITIATOR,
    INIT_DATE,
    INITIATOR_EMAIL,
    SGS_KEY.BRANCH_NAME,
    APPROVER,
    APPROVER_EMAIL,
    APPROVE_DATE
   from
    SGS_KEY,
    SGS_KEY_FLOW
   where SGS_KEY.APPLY_FLOW_ID=SGS_KEY_FLOW.KEY_FLOW_ID
   <dynamic prepend="and" open="(" close=")">  
    <isNotNull property="ki.userId" prepend="and" removeFirstPrepend="false">
     USER_ID = #ki.userId#
    </isNotNull>
    <isNotNull property="kfi.initiator" prepend="and">
     INITIATOR = #kfi.initiator#
    </isNotNull>
    <isNotNull property="kfi.initDate" prepend="and">
     INIT_DATE = #kfi.initDate#
    </isNotNull>
   </dynamic>
</select>

<update id="updateKeyFlow" parameterClass="KeyFlowInfo">
   update SGS_KEY_FLOW set
   <dynamic>
     KEY_FLOW_ID =#keyFlowId#
    <isNotNull property="branchName" prepend=",">
     BRANCH_NAME = #branchName#
    </isNotNull>
    <isNotEqual property="operation" prepend="," compareProperty="operation" compareValue="0">
     OPERATION = #operation#
    </isNotEqual>
    <isNotNull property="initiator" prepend=",">
     INITIATOR = #initiator#
    </isNotNull>
    <isNotNull property="initiatorEmail" prepend=",">
     INITIATOR_EMAIL = #initiatorEmail#
    </isNotNull>
    <isNotNull property="initDate" prepend=",">
     INIT_DATE = #initDate#
    </isNotNull>
    <isNotNull property="approver" prepend=",">
     APPROVER = #approver#
    </isNotNull>
    <isNotNull property="approverEmail" prepend=",">
     APPROVER_EMAIL = #approverEmail#
    </isNotNull>
    <isNotNull property="approveDate" prepend=",">
     APPROVE_DATE = #approveDate#
    </isNotNull>
    <isNotEqual property="keyNum" prepend="," compareProperty="keyNum" compareValue="0">
     KEY_NUM = #keyNum#
    </isNotEqual>
    <isNotNull property="applyReason" prepend=",">
     APPLY_REASON = #applyReason#
    </isNotNull>
    <isNotNull property="rejectReason" prepend=",">
     REJECT_REASON = #rejectReason#
    </isNotNull>                       
   </dynamic>
   where
    KEY_FLOW_ID =#keyFlowId#
</update>

0:26 2008-2-20补充:

让iBatis中的insert返回主键 [ibatis insert 返回 自增主键]

iBatis SQL-map 文件书写注意事项

http://ibatis.apache.org/dtd/sql-map-2.dtd 中有<dynamic>的定义

<!-- - - - - - - - - - - - - - - - - - - - - - - - -
                 DYNAMIC ELEMENTS
- - - - - - - - - - - - - - - - - - - - - - - - -->

<!ELEMENT dynamic (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST dynamic
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
>

<!ELEMENT isNotNull (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isNotNull
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isNull (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isNull
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isNotPropertyAvailable (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isNotPropertyAvailable
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #REQUIRED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isPropertyAvailable (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isPropertyAvailable
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #REQUIRED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isEqual (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isEqual
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
compareProperty CDATA #IMPLIED
compareValue CDATA #IMPLIED
>

<!ELEMENT isNotEqual (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isNotEqual
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
compareProperty CDATA #IMPLIED
compareValue CDATA #IMPLIED
>

<!ELEMENT isGreaterThan (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isGreaterThan
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
compareProperty CDATA #IMPLIED
compareValue CDATA #IMPLIED
>

<!ELEMENT isGreaterEqual (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isGreaterEqual
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
compareProperty CDATA #IMPLIED
compareValue CDATA #IMPLIED
>

<!ELEMENT isLessThan (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isLessThan
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
compareProperty CDATA #IMPLIED
compareValue CDATA #IMPLIED
>

<!ELEMENT isLessEqual (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isLessEqual
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
compareProperty CDATA #IMPLIED
compareValue CDATA #IMPLIED
>

<!ELEMENT isEmpty (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isEmpty
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isNotEmpty (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isNotEmpty
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isParameterPresent (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isParameterPresent
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT isNotParameterPresent (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST isNotParameterPresent
prepend CDATA #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
removeFirstPrepend (true|false) #IMPLIED
>

<!ELEMENT iterate (#PCDATA | include | iterate | isParameterPresent | isNotParameterPresent | isEmpty | isNotEmpty | isNotNull | isNull | isNotEqual | isEqual | isGreaterThan | isGreaterEqual | isLessThan | isLessEqual | isPropertyAvailable | isNotPropertyAvailable)*>
<!ATTLIST iterate
prepend CDATA #IMPLIED
property CDATA #IMPLIED
removeFirstPrepend (true|false|iterate) #IMPLIED
open CDATA #IMPLIED
close CDATA #IMPLIED
conjunction CDATA #IMPLIED
>

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