improved sql parser.

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlCreateTableParser.java

@@ -72,10 +72,13 @@ public class MySqlCreateTableParser extends SQLCreateTableParser {
     }
 
     public MySqlCreateTableStatement parseCrateTable(boolean acceptCreate) {
+        MySqlCreateTableStatement stmt = new MySqlCreateTableStatement();
         if (acceptCreate) {
+            if (lexer.hasComment() && lexer.isKeepComments()) {
+                stmt.addBeforeComment(lexer.readAndResetComments());
+            }
             accept(Token.CREATE);
         }
-        MySqlCreateTableStatement stmt = new MySqlCreateTableStatement();
 
         if (identifierEquals("TEMPORARY")) {
             lexer.nextToken();

src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlLexer.java

@@ -71,8 +71,7 @@ public class MySqlLexer extends Lexer {
     }
 
     public MySqlLexer(String input){
-        super(input);
-        super.keywods = DEFAULT_MYSQL_KEYWORDS;
+        this(input, true, true);
     }
 
     public MySqlLexer(String input, boolean skipComment, boolean keepComments){
@@ -407,7 +406,7 @@ public class MySqlLexer extends Lexer {
                 bufPos++;
             }
 
-            stringVal = subString(mark, bufPos + 1);
+            stringVal = subString(mark, bufPos);
             token = Token.LINE_COMMENT;
             commentCount++;
             if (keepComments) {

src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java

@@ -471,6 +471,9 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
     }
 
     public boolean visit(MySqlCreateTableStatement x) {
+        if (isPrettyFormat() && x.hasBeforeComment()) {
+            printlnComments(x.getBeforeCommentsDirect());
+        }
 
         print0(ucase ? "CREATE " : "create ");
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleSelectTableSource.java

@@ -23,8 +23,4 @@ public interface OracleSelectTableSource extends SQLTableSource {
     OracleSelectPivotBase getPivot();
 
     void setPivot(OracleSelectPivotBase pivot);
-
-    SQLExpr getFlashback();
-
-    void setFlashback(SQLExpr flashback);
 }