/* * The MIT License (MIT) * * Copyright (c) 2014-2017 [email protected] * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package top.fastsql.util; import net.sf.jsqlparser.parser.CCJSqlParserUtil; import net.sf.jsqlparser.statement.Statement; import net.sf.jsqlparser.statement.select.*; import java.util.List; /** * 处理 Order by * * @author liuzh * @since 2015-06-27 */ public class OrderByParser { /** * convert to order by sql * * @param sql * @param orderBy * @return */ public static String converToOrderBySql(String sql, String orderBy) { //解析SQL Statement stmt = null; try { stmt = CCJSqlParserUtil.parse(sql); Select select = (Select) stmt; SelectBody selectBody = select.getSelectBody(); //处理body-去最外层order by List<OrderByElement> orderByElements = extraOrderBy(selectBody); String defaultOrderBy = PlainSelect.orderByToString(orderByElements); if (defaultOrderBy.indexOf('?') != -1) { throw new RuntimeException("原SQL[" + sql + "]中的order by包含参数,因此不能使用OrderBy插件进行修改!"); } //新的sql sql = select.toString(); } catch (Throwable e) { e.printStackTrace(); } return sql + " order by " + orderBy; } /** * extra order by and set default orderby to null * * @param selectBody */ public static List<OrderByElement> extraOrderBy(SelectBody selectBody) { if (selectBody instanceof PlainSelect) { List<OrderByElement> orderByElements = ((PlainSelect) selectBody).getOrderByElements(); ((PlainSelect) selectBody).setOrderByElements(null); return orderByElements; } else if (selectBody instanceof WithItem) { WithItem withItem = (WithItem) selectBody; if (withItem.getSelectBody() != null) { return extraOrderBy(withItem.getSelectBody()); } } else { SetOperationList operationList = (SetOperationList) selectBody; if (operationList.getSelects() != null && operationList.getSelects().size() > 0) { List<SelectBody> plainSelects = operationList.getSelects(); return extraOrderBy(plainSelects.get(plainSelects.size() - 1)); } } return null; } }