From a0e60fd91b65d95d55dd99b2420c06912333387e Mon Sep 17 00:00:00 2001
From: "gu.martinm@gmail.com" <gu.martinm@gmail.com>
Date: Wed, 4 Mar 2015 11:24:41 +0100
Subject: [PATCH] Pseudo batch update with CASE

---
 .../mybatis/repository/mapper/AdCustomMapper.java  |  2 ++
 .../spring/service/ExampleCustomService.java       |  3 ++-
 .../mybatis/repository/mapper/AdCustomMapper.xml   | 24 ++++++++++++++++++++++
 3 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/repository/mapper/AdCustomMapper.java b/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/repository/mapper/AdCustomMapper.java
index f6c6bdf..f73aa47 100644
--- a/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/repository/mapper/AdCustomMapper.java
+++ b/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/repository/mapper/AdCustomMapper.java
@@ -14,4 +14,6 @@ public interface AdCustomMapper extends MyBatisScanFilter {
 	List<Ad> selectAdsList();
 	
 	void updateAdsBatch(List<Ad> ads);
+	
+	void updateAdsBatchWithCase(List<Ad> ads);
 }
diff --git a/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/spring/service/ExampleCustomService.java b/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/spring/service/ExampleCustomService.java
index b69f69d..6fbdef3 100644
--- a/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/spring/service/ExampleCustomService.java
+++ b/MyBatis/MyBatis-Spring/src/main/java/de/example/mybatis/spring/service/ExampleCustomService.java
@@ -49,7 +49,7 @@ public class ExampleCustomService {
     	final List<Ad> ads = this.adCustomMapper.selectAdsList();
     	final List<Ad> updateAds = new ArrayList<Ad>();
     	
-    	long companyId = 10;
+    	long companyId = 66;
     	long companyCategId = 20;
     	String mobileImage = "newimage.jpg";
         for (final Ad ad : ads) {
@@ -62,6 +62,7 @@ public class ExampleCustomService {
         	companyCategId++;
         }
         
+        this.adCustomMapper.updateAdsBatchWithCase(updateAds);
         this.adCustomMapper.updateAdsBatch(updateAds);
     }
 }
diff --git a/MyBatis/MyBatis-Spring/src/main/resources/de/example/mybatis/repository/mapper/AdCustomMapper.xml b/MyBatis/MyBatis-Spring/src/main/resources/de/example/mybatis/repository/mapper/AdCustomMapper.xml
index a1464d2..b51bd4a 100644
--- a/MyBatis/MyBatis-Spring/src/main/resources/de/example/mybatis/repository/mapper/AdCustomMapper.xml
+++ b/MyBatis/MyBatis-Spring/src/main/resources/de/example/mybatis/repository/mapper/AdCustomMapper.xml
@@ -20,6 +20,30 @@
   		</foreach>
   </update>
   
+    <update id="updateAdsBatchWithCase" parameterType="List">		
+    		UPDATE ad
+    			SET
+    			company_id = CASE id
+    				<foreach collection="list" item="ad">
+    				WHEN #{ad.id} THEN #{ad.companyId}    					
+    				</foreach>
+    			END,
+    			company_categ_id = CASE id
+    				<foreach collection="list" item="ad">
+    				WHEN #{ad.id} THEN #{ad.companyCategId}    					
+    				</foreach>
+    			END,
+    			ad_mobile_image = CASE id
+    				<foreach collection="list" item="ad">
+    				WHEN #{ad.id} THEN #{ad.adMobileImage}    					
+    				</foreach>
+    			END
+    		WHERE id IN (
+    		<foreach collection="list" item="ad" separator=",">
+    			#{ad.id}   					
+    		</foreach> )
+  </update>
+  
    <select id="selectAdsList" resultType="de.example.mybatis.model.Ad" flushCache="false" useCache="true" timeout="10000" statementType="PREPARED">
   		select * FROM ad
   </select>
-- 
2.1.4