solution v1

(cherry picked from commit 3d83c6bd0e2bcca6fc04f73ce08983266b9df636)

ebean-ddl-generator/src/main/java/io/ebeaninternal/dbmigration/ddlgeneration/platform/PlatformDdl.java

@@ -1,6 +1,7 @@
 package io.ebeaninternal.dbmigration.ddlgeneration.platform;
 
 import io.ebean.annotation.ConstraintMode;
+import io.ebean.annotation.Platform;
 import io.ebean.config.DatabaseConfig;
 import io.ebean.config.DbConstraintNaming;
 import io.ebean.config.dbplatform.DatabasePlatform;
@@ -24,6 +25,7 @@ import io.ebeaninternal.dbmigration.model.MTable;
 import java.io.IOException;
 import java.util.Collection;
 import java.util.List;
+import java.util.Locale;
 
 /**
  * Controls the DDL generation for a specific database platform.
@@ -317,12 +319,32 @@ public class PlatformDdl {
     if (type == null) {
       return null;
     }
+    
+    type = extract(type);
+    
     if (type.contains("[]")) {
       return convertArrayType(type);
     }
     return typeConverter.convert(type);
   }
 
+  // if columnType is different for different platforms, use pattern
+  // @Column(columnDefinition = PLATFORM1;DEFINITION1;PLATFORM2;DEFINITON2;DEFINITON-DEFAULT)
+  // e.g. @Column(columnDefinition = "db2;blob(64M);sqlserver,h2;varchar(227);varchar(127)")
+  private String extract(String type) {
+    String[] tmp = type.split(";");
+    assert tmp.length % 2 == 1;
+    for (int i = 0; i < tmp.length - 2; i+=2) {
+      String[] platforms = tmp[i].split(",");
+      for (String plat : platforms) {
+        if (platform.isPlatform(Platform.valueOf(plat.toUpperCase(Locale.ENGLISH)))) {
+          return tmp[i+1];
+        }
+      }
+    }
+    return tmp[tmp.length-1]; // else
+  }
+
   /**
    * Convert the logical array type to a db platform specific type to support the array data.
    */

ebean-test/src/test/java/misc/migration/v1_0/EBasic.java

@@ -5,6 +5,7 @@ import io.ebean.annotation.EnumValue;
 import io.ebean.annotation.Index;
 import io.ebean.annotation.NotNull;
 
+import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.Id;
 import javax.persistence.ManyToOne;
@@ -39,7 +40,8 @@ public class EBasic {
   @Size(max=127)
   String name;
 
-  @Size(max=127)
+ // @Size(max=127)
+  @Column(columnDefinition = "db2;blob(64M);sqlserver,h2;varchar(227);varchar(127)")
   String description;
 
   Timestamp someDate;