/* * 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 com.github.pagehelper.sql; import net.sf.jsqlparser.JSQLParserException; import net.sf.jsqlparser.expression.Expression; import net.sf.jsqlparser.expression.Function; import net.sf.jsqlparser.parser.CCJSqlParserUtil; import net.sf.jsqlparser.statement.Statement; import net.sf.jsqlparser.statement.select.PlainSelect; import net.sf.jsqlparser.statement.select.Select; import net.sf.jsqlparser.statement.select.SelectExpressionItem; import net.sf.jsqlparser.statement.select.SelectItem; import org.junit.Test; import java.util.List; /** * @author liuzh */ public class FunctionCountTest { public static Select select(String sql) { Statement stmt = null; try { stmt = CCJSqlParserUtil.parse(sql); } catch (JSQLParserException e) { throw new RuntimeException(e); } if (stmt instanceof Select) { return (Select) stmt; } throw new RuntimeException("仅支持Select查询"); } @Test public void test() { Select select = select("select max(name),code,min(aa),nvl(ab,0),heh from user where a > 100"); List<SelectItem> selectItems = ((PlainSelect) select.getSelectBody()).getSelectItems(); for (SelectItem item : selectItems) { if (item instanceof SelectExpressionItem) { Expression exp = ((SelectExpressionItem) item).getExpression(); if (exp instanceof Function) { System.out.println("Function:" + item.toString()); } else { System.out.println("Not a function:" + exp.toString()); } } else { System.out.println("Not a function:" + item.toString()); } } } @Test public void test2() { Select select = select("select distinct(name) from user where a > 100"); List<SelectItem> selectItems = ((PlainSelect) select.getSelectBody()).getSelectItems(); for (SelectItem item : selectItems) { if (item instanceof Function) { System.out.println("Function:" + item.toString()); } else { System.out.println("Not a function:" + item.toString()); } } } }