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/*
 * Copyright (C) 2018  Sun.Hao
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */

package lodsve.mybatis.dialect;

/**
 * mysql数据库方言.
 *
 * @author sunhao([email protected])
 * @version V1.0, 2016-2-18 15:42
 */
public class MySQLDialect extends AbstractDialect {
    @Override
    public String getPageSql(String sql, int offset, int limit) {
        StringBuilder sqlBuilder = new StringBuilder(sql);

        if (offset <= 0) {
            return sqlBuilder.append(" limit ").append(limit).toString();
        }
        return sqlBuilder.append(" limit ").append(offset).append(",").append(limit).toString();
    }

    @Override
    String existTableSql(String schema, String tableName) {
        StringBuilder sql = new StringBuilder("SELECT count(TABLE_NAME) count FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA='");
        sql.append(schema).append("' and TABLE_NAME = '").append(tableName).append("'");

        return sql.toString();
    }
}