wordpress开启全站ssl,html代码按钮,备案 个人网站建设方案书,龙采网站建设案例前言
工作中写的一段代码#xff0c;备个份#xff0c;以后兴许能直接用 功能描述#xff1a;如果前端传入了排序规则#xff0c;则优先按传入的字段进行排序#xff0c;SQL原有的排序规则追加到末尾 正文
定义拦截器 import cn.hutool.core.bean.BeanUtil;
import cn.h…前言
工作中写的一段代码备个份以后兴许能直接用 功能描述如果前端传入了排序规则则优先按传入的字段进行排序SQL原有的排序规则追加到末尾 正文
定义拦截器 import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.collection.CollUtil;
import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
import com.baomidou.mybatisplus.extension.parser.JsqlParserSupport;
import com.baomidou.mybatisplus.extension.plugins.inner.InnerInterceptor;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.schema.Column;
import net.sf.jsqlparser.statement.select.OrderByElement;
import net.sf.jsqlparser.statement.select.PlainSelect;
import net.sf.jsqlparser.statement.select.Select;
import org.apache.ibatis.binding.MapperMethod;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.jetbrains.annotations.Nullable;import java.sql.Connection;
import java.util.List;/*** 添加自定义排序规则* 如果前端传入了排序规则则优先按传入的字段进行排序SQL原有的排序规则追加到末尾* 这个SQL的处理方式【不是基于】字符串拼接底层的SQL执行是基于 com.mysql.cj.jdbc.ClientPreparedStatement.execute,* PreparedStatement 是防SQL注入的强行做SQL注入会抛语法错误的异常 - syntax exception* author weiheng* date 2024-01-23**/
Slf4j
public class MybatisPageOrderSqlInterceptor extends JsqlParserSupport implements InnerInterceptor {/** 排序方式 - 升序 */private static final String SORT_ASC asc;Overridepublic void beforePrepare(StatementHandler sh, Connection connection, Integer transactionTimeout) {if (log.isDebugEnabled()) {log.info( 自定义排序拦截 StatementHandler[{}], sh);log.info( 自定义排序拦截 connection[{}], connection);log.info( 自定义排序拦截 transactionTimeout[{}], transactionTimeout);}PluginUtils.MPStatementHandler mpSh PluginUtils.mpStatementHandler(sh);PluginUtils.MPBoundSql mpBs mpSh.mPBoundSql();// 取分页查询的入参 PageDTOPageDTO pageDto getPageDTO(mpSh);if (pageDto null || CollUtil.isEmpty(pageDto.getOrderColumns())) {// 不是自定义分页查询不做处理return;}mpBs.sql(parserMulti(mpBs.sql(), pageDto));}Overrideprotected void processSelect(Select select, int index, String sql, Object obj) {PageDTO dto;if (obj instanceof PageDTO) {dto (PageDTO) obj;} else {// 如果不是分页查询则不做处理return;}// 1. 解析SQLPlainSelect plainSelect (PlainSelect) select.getSelectBody();ListOrderByElement originOrderList plainSelect.getOrderByElements();ListOrderByElement clonedOriginOrder null;if (CollUtil.isNotEmpty(originOrderList)) {// 创建副本然后删除原有排序规则clonedOriginOrder BeanUtil.copyToList(originOrderList, OrderByElement.class);originOrderList.clear();}// 2. 向 plainSelect 中添加自定义排序规则addCustomizeSortColumns(dto, plainSelect);// 3. 添加SQL的原始排序规则 - 追加到末尾if (CollUtil.isNotEmpty(clonedOriginOrder)) {plainSelect.addOrderByElements(clonedOriginOrder);}if (log.isDebugEnabled()) {log.info( 自定义排序拦截 plainSelect[{}], plainSelect);}}/*** 添加自定义排序规则** param dto SQL查询入参* param plainSelect 明文* author weiheng**/private void addCustomizeSortColumns(PageDTO dto, PlainSelect plainSelect) {ListOrderColumnDTO orderColumns dto.getOrderColumns();for (OrderColumnDTO c : orderColumns) {// 构建新的排序规则OrderByElement orderByElement new OrderByElement();// 设置排序 - 不传值则默认asc升序orderByElement.setAsc(SORT_ASC.equalsIgnoreCase(c.getSort()));// 设置排序字段orderByElement.setExpression(new Column(c.getOrderColumn()));// 重新封装条件 - 优先按自定义进行排序plainSelect.addOrderByElements(orderByElement);}}/*** 分页查询入参获取* 大概搜了下没有到3个入参的如果有请将 PageDTO 放到第1或第2的位置* param mpSh 处理对象* return 分页查询入参* author weiheng**/Nullableprivate PageDTO getPageDTO(PluginUtils.MPStatementHandler mpSh) {PageDTO pageDto null;Object obj mpSh.parameterHandler().getParameterObject();try {Object param ((MapperMethod.ParamMap?) obj).get(param1);if (param instanceof PageDTO) {pageDto (PageDTO) param;} else {param ((MapperMethod.ParamMap?) obj).get(param2);if (param instanceof PageDTO) {pageDto (PageDTO) param;}}} catch (Exception e) {// 没有从SQL中获取到对应的参数没有param1或param2不走自定义分页逻辑}return pageDto;}}添加插件 - 添加自定义的拦截器 import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.BlockAttackInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.OptimisticLockerInnerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** mybatis配置* author Heng.Wei* date 2022-05-11**/
Configuration
public class MybatisPlusConfig {Beanpublic MybatisPlusInterceptor paginationInterceptor() {MybatisPlusInterceptor interceptor new MybatisPlusInterceptor();// 乐观锁插件interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());// 分页插件interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));// 添加防止全表更新与删除插件interceptor.addInnerInterceptor(new BlockAttackInnerInterceptor());// 深度分页插件interceptor.addInnerInterceptor(new MybatisHighPageInterceptor());// 添加自定义排序interceptor.addInnerInterceptor(new MybatisPageOrderSqlInterceptor());return interceptor;}
}代码很简单不多做废话了自测OK
