refactor select parser

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parsing/parser/dialect/mysql/MySQLSelectParser.java

@@ -40,8 +40,7 @@ public class MySQLSelectParser extends AbstractSelectParser {
     
     @Override
     public void query() {
-        if (getSqlParser().equalAny(DefaultKeyword.SELECT)) {
-            getSqlParser().getLexer().nextToken();
+        if (getSqlParser().skipIfEqual(DefaultKeyword.SELECT)) {
             parseDistinct();
             getSqlParser().skipAll(MySQLKeyword.HIGH_PRIORITY, DefaultKeyword.STRAIGHT_JOIN, MySQLKeyword.SQL_SMALL_RESULT, MySQLKeyword.SQL_BIG_RESULT, MySQLKeyword.SQL_BUFFER_RESULT,
                     MySQLKeyword.SQL_CACHE, MySQLKeyword.SQL_NO_CACHE, MySQLKeyword.SQL_CALC_FOUND_ROWS);

sharding-jdbc-core/src/main/java/com/dangdang/ddframe/rdb/sharding/parsing/parser/dialect/oracle/OracleSelectParser.java

@@ -34,8 +34,7 @@ public class OracleSelectParser extends AbstractSelectParser {
     
     @Override
     public void query() {
-        if (getSqlParser().equalAny(DefaultKeyword.SELECT)) {
-            getSqlParser().getLexer().nextToken();
+        if (getSqlParser().skipIfEqual(DefaultKeyword.SELECT)) {
             parseDistinct();
             parseSelectList();
         }