/*
 * Copyright [2020-2030] [https://www.stylefeng.cn]
 *
 * 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.
 *
 * Guns采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：
 *
 * 1.请不要删除和修改根目录下的LICENSE文件。
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 */
package cn.stylefeng.roses.kernel.db.api.sqladapter.table;

import cn.stylefeng.roses.kernel.db.api.sqladapter.AbstractSql;
import lombok.Getter;

/**
 * 获取某个表的所有字段的sql
 *
 * @author fengshuonan
 * @since 2019-07-16-13:06
 */
@Getter
public class TableFieldListSql extends AbstractSql {

    @Override
    protected String mysql() {
        return "select COLUMN_NAME as columnName,COLUMN_COMMENT as columnComment from information_schema.COLUMNS where table_name = ? and table_schema = ?";
    }

    @Override
    protected String sqlServer() {
        return "SELECT A.name as columnName,\n" +
                "       CONVERT(varchar(200), isnull(G.[value], '')) as columnComment\n" +
                "  FROM syscolumns A\n" +
                "  Left Join systypes B On A.xusertype= B.xusertype\n" +
                "  Inner Join sysobjects D On A.id= D.id\n" +
                "   and D.xtype= 'U'\n" +
                "   and D.name<> 'dtproperties'\n" +
                "  Left Join syscomments E on A.cdefault= E.id\n" +
                "  Left Join sys.extended_properties G on A.id= G.major_id\n" +
                "   and A.colid= G.minor_id\n" +
                "  Left Join sys.extended_properties F On D.id= F.major_id\n" +
                "   and F.minor_id= 0\n" +
                " where d.name= ? \n" +
                " Order By A.id,\n" +
                "         A.colorder";
    }

    @Override
    protected String pgSql() {
        return "SELECT a.attname as \"columnName\" , col_description(a.attrelid,a.attnum) as \"columnComment\"\n" +
                "FROM pg_class as c,pg_attribute as a " +
                "where c.relname = ? and a.attrelid = c.oid and a.attnum>0";
    }

    @Override
    protected String oracle() {
        return "select column_name as columnName, comments as columnComment from user_col_comments where Table_Name= ?";
    }

    @Override
    protected String dm() {
        return oracle();
    }

    @Override
    protected String kingbase() {
        return pgSql();
    }

    @Override
    protected String vastbase() {
        return pgSql();
    }

    @Override
    protected String openGauss() {
        return pgSql();
    }

}
