/*
 * 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;

import java.util.List;

import com.alibaba.druid.sql.SQLUtils;
import com.alibaba.druid.util.JdbcConstants;
import org.junit.Assert;
import junit.framework.TestCase;

import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor;
import com.alibaba.druid.sql.parser.SQLStatementParser;

public class SHOW_COLUMNS_Syntax_Test extends TestCase {
    public void test_0() throws Exception {
        String sql = "SHOW COLUMNS FROM City;";

        SQLStatementParser parser = new MySqlStatementParser(sql);
        List<SQLStatement> stmtList = parser.parseStatementList();

        String text = output(stmtList);

        Assert.assertEquals("SHOW COLUMNS FROM City;", text);
    }

    public void test_1() throws Exception {
        String sql = "SHOW COLUMNS FROM mytable FROM mydb;";

        SQLStatementParser parser = new MySqlStatementParser(sql);
        List<SQLStatement> stmtList = parser.parseStatementList();

        String text = output(stmtList);

        Assert.assertEquals("SHOW COLUMNS FROM mydb.mytable;", text);
    }

    public void test_2() throws Exception {
        String sql = "SHOW COLUMNS FROM mydb.mytable;";

        SQLStatementParser parser = new MySqlStatementParser(sql);
        List<SQLStatement> stmtList = parser.parseStatementList();

        String text = output(stmtList);

        Assert.assertEquals("SHOW COLUMNS FROM mydb.mytable;", text);
    }

    public void test_3() throws Exception {
        String sql = "SHOW COLUMNS FROM mytable IN mydb;";

        SQLStatementParser parser = new MySqlStatementParser(sql);
        List<SQLStatement> stmtList = parser.parseStatementList();

        String text = output(stmtList);

        Assert.assertEquals("SHOW COLUMNS FROM mydb.mytable;", text);
    }

    private String output(List<SQLStatement> stmtList) {
        return SQLUtils.toSQLString(stmtList, JdbcConstants.MYSQL);
    }
}
