improve sql parser for mysql

src/main/java/com/alibaba/druid/sql/parser/SQLExprParser.java

@@ -1421,7 +1421,9 @@ public class SQLExprParser extends SQLParser {
 
         if (lexer.token == Token.UNIQUE) {
             lexer.nextToken();
-            accept(Token.KEY);
+            if (lexer.token() == Token.KEY) {
+                lexer.nextToken();
+            }
             column.getConstaints().add(new SQLColumnPrimaryKey());
             return parseColumnRest(column);
         }

src/test/java/com/alibaba/druid/bvt/sql/mysql/MySqlCreateTableTest49.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.mysql;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.sql.MysqlTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
+import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlSchemaStatVisitor;
+import com.alibaba.druid.stat.TableStat;
+
+public class MySqlCreateTableTest49 extends MysqlTest {
+
+    public void test_0() throws Exception {
+        String sql = "    create table tauth (" //
+                     + "        cid varchar(36) not null unique,"//
+                     + "        cdesc varchar(200),"//
+                     + "        cname varchar(100) not null,"//
+                     + "        cseq decimal(22,0),"//
+                     + "        curl varchar(200),"//
+                     + "        cpid varchar(36),"//
+                     + "        primary key (cid)"//
+                     + "    )"; //
+
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        SQLStatement stmt = parser.parseCreateTable();
+
+        MySqlSchemaStatVisitor visitor = new MySqlSchemaStatVisitor();
+        stmt.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        Assert.assertEquals(1, visitor.getTables().size());
+        Assert.assertEquals(6, visitor.getColumns().size());
+        Assert.assertEquals(0, visitor.getConditions().size());
+
+        Assert.assertTrue(visitor.getTables().containsKey(new TableStat.Name("tauth")));
+
+        String output = SQLUtils.toMySqlString(stmt);
+        Assert.assertEquals("CREATE TABLE tauth (" //
+                            + "\n\tcid varchar(36) NOT NULL PRIMARY KEY, "//
+                            + "\n\tcdesc varchar(200), "//
+                            + "\n\tcname varchar(100) NOT NULL, "//
+                            + "\n\tcseq decimal(22, 0), "//
+                            + "\n\tcurl varchar(200), "//
+                            + "\n\tcpid varchar(36), "//
+                            + "\n\tPRIMARY KEY (cid)"//
+                            + "\n)",//
+                            output);
+
+    }
+}