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An enhanced toolkit of Mybatis to simplify development.

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/*
 * Copyright (c) 2011-2023, baomidou ([email protected]).
 *
 * 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.baomidou.mybatisplus.extension.plugins.pagination.dialects;

import com.baomidou.mybatisplus.extension.plugins.pagination.DialectModel;

/**
 * ORACLE 数据库分页语句组装实现
 * 通用分页版本
 *
 * @author hubin
 * @since 2016-01-23
 */
public class OracleDialect implements IDialect {

    @Override
    public DialectModel buildPaginationSql(String originalSql, long offset, long limit) {
        limit = (offset >= 1) ? (offset + limit) : limit;
        String sql = "SELECT * FROM ( SELECT TMP.*, ROWNUM ROW_ID FROM ( " +
            originalSql + " ) TMP WHERE ROWNUM <=" + FIRST_MARK + ") WHERE ROW_ID > " + SECOND_MARK;
        return new DialectModel(sql, limit, offset).setConsumerChain();
    }
}