fix bug metabase

dlink-common/src/main/java/com/dlink/model/Table.java

@@ -129,10 +129,10 @@ public class Table implements Serializable, Comparable<Table> {
                 sb.append(",");
             }
             String columnComment= columns.get(i).getComment();
-            if(columnComment.contains("\'") | columnComment.contains("\"")) {
-                columnComment = columnComment.replaceAll("\"|'","");
-            }
             if(Asserts.isNotNullString(columnComment)){
+                if (columnComment.contains("\'") | columnComment.contains("\"")) {
+                    columnComment = columnComment.replaceAll("\"|'", "");
+                }
                 sb.append("`"+columns.get(i).getName() + "`  --  " + columnComment + " \n");
             }else {
                 sb.append("`"+columns.get(i).getName() + "` \n");

dlink-metadata/dlink-metadata-base/src/main/java/com/dlink/metadata/driver/AbstractJdbcDriver.java

@@ -208,7 +208,7 @@ public abstract class AbstractJdbcDriver extends AbstractDriver {
                 if(columnList.contains(dbQuery.columnType())) {
                     field.setType(results.getString(dbQuery.columnType()));
                 }
-                if(columnList.contains(dbQuery.columnComment())) {
+                if(columnList.contains(dbQuery.columnComment())&& Asserts.isNotNull(results.getString(dbQuery.columnComment()))) {
                     String columnComment = results.getString(dbQuery.columnComment()).replaceAll("\"|'", "");
                     field.setComment(columnComment);
                 }