add testcase.

src/test/java/com/alibaba/druid/bvt/sql/mysql/alter/MySqlAlterTableTest35_multi.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright 1999-2018 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.alter;
+
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.util.JdbcConstants;
+import junit.framework.TestCase;
+
+import java.util.List;
+
+public class MySqlAlterTableTest35_multi extends TestCase {
+
+    public void test_alter_add_key() throws Exception {
+        String sql = "ALTER TABLE `datacompute`.`users_quan` \n" +
+                "DROP COLUMN `address`,\n" +
+                "CHANGE COLUMN `name` `username` VARCHAR(255) NULL DEFAULT 'username' ,\n" +
+                "ADD COLUMN `age` VARCHAR(45) NULL DEFAULT 'age' AFTER `username`,\n" +
+                "ADD UNIQUE INDEX `idx_username` (`username` ASC), RENAME TO  `datacompute`.`users_dc` ;";
+        List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, JdbcConstants.MYSQL);
+        assertEquals(1, stmtList.size());
+        SQLStatement stmt = stmtList.get(0);
+        String output = SQLUtils.toMySqlString(stmt);
+        assertEquals("ALTER TABLE `datacompute`.`users_quan`\n" +
+                "\tDROP COLUMN `address`,\n" +
+                "\tCHANGE COLUMN `name` `username` VARCHAR(255) NULL DEFAULT 'username',\n" +
+                "\tADD COLUMN `age` VARCHAR(45) NULL DEFAULT 'age' AFTER `username`,\n" +
+                "\tADD UNIQUE INDEX `idx_username` (`username` ASC),\n" +
+                "\tRENAME TO `datacompute`.`users_dc`;", output);
+    }
+}