--no commit message

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h2/src/main/org/h2/schema/Constant.java

@@ -26,6 +26,10 @@ public class Constant extends SchemaObject {
     public String getCreateSQLForCopy(Table table, String quotedName) {
         throw Message.getInternalError();
     }
+    
+    public String getDropSQL() {
+        return null;
+    }
 
     public String getCreateSQL() {
         StringBuffer buff = new StringBuffer();

h2/src/main/org/h2/schema/Schema.java

@@ -45,6 +45,10 @@ public class Schema extends DbObject {
     public String getCreateSQLForCopy(Table table, String quotedName) {
         throw Message.getInternalError();
     }
+    
+    public String getDropSQL() {
+        return null;
+    }
 
     public String getCreateSQL() {
         if(system) {

h2/src/main/org/h2/schema/Sequence.java

@@ -45,6 +45,13 @@ public class Sequence extends SchemaObject {
         this.increment = inc;
     }
     
+    public String getDropSQL() {
+        if(getBelongsToTable()) {
+            return null;
+        }
+        return "DROP SEQUENCE IF EXISTS " + getSQL();
+    }
+    
     public String getCreateSQLForCopy(Table table, String quotedName) {
         throw Message.getInternalError();
     }    

h2/src/main/org/h2/schema/TriggerObject.java

@@ -161,6 +161,10 @@ public class TriggerObject extends SchemaObject {
     public boolean getNoWait() {
         return noWait;
     }
+    
+    public String getDropSQL() {
+        return null;
+    }
 
     public String getCreateSQLForCopy(Table table, String quotedName) {
         StringBuffer buff = new StringBuffer();