iBATIS動態標籤
ibatis動態查詢:iBATIS動態查詢的實現淺析
iBATIS動態查詢實現主要是在iBATIS中使用安全拼接語句,動態查詢 iBATIS比JDBC的優勢:安全高效
iBATIS動態查詢例子:(介紹說明文字在註釋中)
<select id ="selectAllProducts" parameterClass ="Product" resultMap ="ProductResult"> select id,note from Product <dynamic prepend ="WHERE">
<!-- isNotNull判斷引數是否存在,Integer型別 --> <isNotNull property ="id">
<!-- isGreaterThan判斷引數是否大於compareValue,isGreaterEquals是大於等於 --> <isGreaterThan prepend =" and " property ="id" compareValue ="0"> id = #id# </isGreaterThan> </isNotNull>
<!-- isNotEmpty判斷字串不為空,isEmpty可以判斷字串為空 --> <isNotEmpty prepend =" and " property ="note">
<!-- 模糊查詢不能用#,#在是用prepareStatement?插入引數,$是文字替換 --> note like '%$note$%' </isNotEmpty> </dynamic> </select>
iBATIS動態查詢解釋:
用Map傳引數
<select id ="selectAllProducts" parameterClass ="java.util.HashMap" resultMap
="ProductResult">
select id,note from Product <dynamic prepend ="WHERE">
<!-- isPropertyAvailable判斷屬性是否有效 --> <isPropertyAvailable property ="id"> <isNotNull property ="id">
<!-- isLessThan判斷引數是否小於compareValue,isLessEquals是小於等於 --> <isLessThan prepend =" and " property ="id" compareValue ="10"> id = #id# </isLessThan> </isNotNull>
</isPropertyAvailable> </dynamic> </select>
iBATIS動態查詢幾個常用屬性
< isPropertyAvailable > 屬性是存在
< isNotPropertyAvailable > 屬性不存在
< isNull > 屬性值是null
< isEmpty > 判斷Collection.size < 1 或String.length<1
<isEqual > 等於
< isNotEqual > 不等於
< isGreaterThan > 大於
< isGreaterEqual > 大於等於
< isLessThan > 小於
< isLessEqual > 小於等於
iBATIS動態查詢相關資訊就向你介紹到這裡希望對你瞭解iBATIS動態查詢有所幫助
§<dynamic>標籤
§二元標籤
§一元標籤
§<iterate>標籤
§ 共同的屬性 prepend,open,close
<dynamic>標籤
§<dynamic>標籤
§屬性 prepend,open,close
二元條件標籤
§<isEqual property=“age”compareValue=“20”>
比較屬性值和靜態值或另一個屬性值是否相等
§<isNotEqual>
比較屬性值和靜態值或另一個屬性值是否不相等。
§<isGreaterThan>
比較屬性值是否大於靜態值或另一個屬性值。
§<isGreaterEqual>
比較屬性值是否大於等於靜態值或另一個屬性值。
§<isLessThan>
比較屬性值是否小於靜態值或另一個屬性值。
§<isLessEqual>
比較屬性值是否小於等於靜態值或另一個屬性值。
一元條件標籤
§<isPropertyAvailable>
檢查是否存在該屬性（存在parameter bean的屬性）
§<isNotPropertyAvailable>
檢查是否不存在該屬性（不存在parameter bean的屬性）
§<isNull>
檢查屬性是否為null
§<isNotNull>
檢查屬性是否不為null
§<isEmpty>
檢查Collection.size()的值，屬性的String或String.valueOf()值,是否為null或空（“”或size() < 1）
§<isNotEmpty>
檢查Collection.size()的值，屬性的String或String.valueOf()值,是否不為null或不為空（“”或size() > 0）
其他標籤
§<isParameterPresent>
檢查是否存在引數物件（不為null）
§<isNotParameterPresent>
檢查是否不存在引數物件（引數物件為null）
§<iterate>
遍歷型別為java.util.List的元素。
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<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMap PUBLIC "-//ibatis.apache.org//DTD SQL Map2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap>
<!-- 動態查詢1-->
<select id="getOrders1"parameterClass="com.air.Account"
resultClass="com.air.Product">
SELECT
orders.id as id,
orders.product asproduct,
orders.customer ascustomer
FROM orders
<dynamic prepend=" WHERE">
<isNullproperty="username">customer IS NOT NULL</isNull>
<isNotNullproperty="username">
orders.customer=#username#
</isNotNull>
</dynamic>
</select>
<!-- 動態查詢2-->
<select id="getOrders2"parameterClass="com.air.Account"
resultClass="com.air.Product">
SELECT
o.id as id,
o.product as product,
o.customer as customer
FROM orders o
<isNotNullproperty="username">
INNER JOIN user_account a ONo.customer=a.username
</isNotNull>
<dynamicprepend="where ">
<isNotEmptyproperty="groupname" prepend="and " open="("close=")">
a.groupname=#groupname#
</isNotEmpty>
</dynamic>
</select>
<!-- 動態查詢3-->
<select id="getOrders3"parameterClass="com.air.Product"
resultClass="com.air.Product">
SELECT
orders.id as id,
orders.product asproduct,
orders.customer ascustomer
FROM orders
<dynamic prepend="WHERE">
<isNotEmptyproperty="product" prepend="and" open="("close=")" removeFirstPrepend="true">
product=#product#
</isNotEmpty>
<isNotEmptyproperty="customer" prepend="and" open="("close=")">
customer=#customer#
</isNotEmpty>
</dynamic>
</select>
<!-- 動態查詢4-->
<select id="getOrders4"parameterClass="com.air.Product"
resultClass="com.air.Product">
SELECT
*
FROM orders
<dynamic prepend="WHERE">
<iterateproperty="keywords" open="(" close=")"conjunction="OR">
product=#keywords[]#
</iterate>
</dynamic>
<!-- <dynamicprepend="WHERE product IN ">-->
<!-- <iterateproperty="keywords" open="(" close=")"conjunction=","> -->
<!-- #keywords[]#-->
<!-- </iterate>-->
<!-- </dynamic>-->
</select>
</sqlMap>
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE sqlMapPUBLIC "-//ibatis.apache.org//DTD SQL Map 2.0//EN"
"http://ibatis.apache.org/dtd/sql-map-2.dtd">
<sqlMap>
<!-- 動態查詢1-->
<select id="getOrders1" parameterClass="com.air.Account"
resultClass="com.air.Product">
SELECT
orders.id as id,
orders.product as product,
orders.customer as customer
FROM orders
<dynamic prepend=" WHERE">
<isNullproperty="username">customer IS NOT NULL</isNull>
<isNotNullproperty="username">
orders.customer=#username#
</isNotNull>
</dynamic>
</select>
<!-- 動態查詢2-->
<select id="getOrders2" parameterClass="com.air.Account"
resultClass="com.air.Product">
SELECT
o.id as id,
o.product as product,
o.customer as customer
FROM orders o
<isNotNullproperty="username">
INNER JOIN user_account a ONo.customer=a.username
</isNotNull>
<dynamic prepend="where">
<isNotEmptyproperty="groupname" prepend="and " open="("close=")">
a.groupname=#groupname#
</isNotEmpty>
</dynamic>
</select>
<!-- 動態查詢3-->
<select id="getOrders3" parameterClass="com.air.Product"
resultClass="com.air.Product">
SELECT
orders.id as id,
orders.product as product,
orders.customer as customer
FROM orders
<dynamic prepend="WHERE">
<isNotEmptyproperty="product" prepend="and" open="("close=")" removeFirstPrepend="true">
product=#product#
</isNotEmpty>
<isNotEmptyproperty="customer" prepend="and" open="("close=")">
customer=#customer#
</isNotEmpty>
</dynamic>
</select>
<!-- 動態查詢4-->
<select id="getOrders4" parameterClass="com.air.Product"
resultClass="com.air.Product">
SELECT
*
FROM orders
<dynamic prepend="WHERE">
<iterateproperty="keywords" open="(" close=")"conjunction="OR">
product=#keywords[]#
</iterate>
</dynamic>
<!-- <dynamic prepend="WHEREproduct IN ">-->
<!-- <iterateproperty="keywords" open="(" close=")"conjunction=","> -->
<!-- #keywords[]#-->
<!-- </iterate>-->
<!-- </dynamic>-->
</select>
</sqlMap>