/* * 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.dialect.helper; import com.github.pagehelper.Page; import com.github.pagehelper.dialect.AbstractHelperDialect; import com.github.pagehelper.util.MetaObjectUtil; import org.apache.ibatis.cache.CacheKey; import org.apache.ibatis.mapping.BoundSql; import org.apache.ibatis.mapping.MappedStatement; import org.apache.ibatis.mapping.ParameterMapping; import org.apache.ibatis.reflection.MetaObject; import java.util.ArrayList; import java.util.List; import java.util.Map; /** * @author liuzh */ public class MySqlDialect extends AbstractHelperDialect { @Override public Object processPageParameter(MappedStatement ms, Map<String, Object> paramMap, Page page, BoundSql boundSql, CacheKey pageKey) { paramMap.put(PAGEPARAMETER_FIRST, page.getStartRow()); paramMap.put(PAGEPARAMETER_SECOND, page.getPageSize()); //处理pageKey pageKey.update(page.getStartRow()); pageKey.update(page.getPageSize()); //处理参数配置 if (boundSql.getParameterMappings() != null) { List<ParameterMapping> newParameterMappings = new ArrayList<ParameterMapping>(boundSql.getParameterMappings()); if (page.getStartRow() == 0) { newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), PAGEPARAMETER_SECOND, Integer.class).build()); } else { newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), PAGEPARAMETER_FIRST, Integer.class).build()); newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), PAGEPARAMETER_SECOND, Integer.class).build()); } MetaObject metaObject = MetaObjectUtil.forObject(boundSql); metaObject.setValue("parameterMappings", newParameterMappings); } return paramMap; } @Override public String getPageSql(String sql, Page page, CacheKey pageKey) { StringBuilder sqlBuilder = new StringBuilder(sql.length() + 14); sqlBuilder.append(sql); if (page.getStartRow() == 0) { sqlBuilder.append(" LIMIT ? "); } else { sqlBuilder.append(" LIMIT ?, ? "); } return sqlBuilder.toString(); } }