一、问题反馈
今天公司测试向我反馈,系统用户模糊查询功能在用户名称包含特殊字符时(_、\、%)无法正常查询结果。
二、问题验证
1、当like中包含_
时,查询仍为全部,即 like '%_%'
查询出来的结果与like '%%'
一致,并不能查询出实际字段中包含有_
特殊字符的结果条目
2、like中包括%
时,与1中相同
3、like中包含\
时,带入查询时,%\%
无法查询到包含字段中有\
的条目
三、问题解决思路
采用MyBatis 拦截器机制,处理模糊查询中包含特殊字符(_、\、%)
四、核心功能代码
4.1 MyBatis 特殊字符拦截器编写
package com.zzg.sql.interceptor;
import java.util.HashMap;
import java.util.Properties;
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
@Intercepts({
@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
RowBounds.class, ResultHandler.class }),
@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class }) })
public class EscapeInterceptor implements Interceptor {
@Override
public Object intercept(Invocation invocation) throws Throwable {
// TODO Auto-generated method stub
// 拦截sql
Object[] args = invocation.getArgs();
MappedStatement statement = (MappedStatement) args[0];
// 请求参数对象
Object parameterObject = args[1];
// 获取 SQL
SqlCommandType sqlCommandType = statement.getSqlCommandType();
if (SqlCommandType.SELECT.equals(sqlCommandType)) {
if (parameterObject instanceof HashMap) {
// 调用特殊字符处理方法
HashMap hash = (HashMap) parameterObject;
hash.forEach((k, v) -> {
// 仅拦截字符串类型且值不为空
if (v != null && v instanceof String) {
String value = (String) v;
value = value.replaceAll("\\\\", "\\\\\\\\");
value = value.replaceAll("_", "\\\\_");
value = value.replaceAll("%", "\\\\%");
// 请求参数对象HashMap重新赋值转义后的值
hash.put(k, value);
}
});
}
}
// 返回
return invocation.proceed();
}
@Override
public Object plugin(Object target) {
// TODO Auto-generated method stub
return Plugin.wrap(target, this);
}
@Override
public void setProperties(Properties properties) {
// TODO Auto-generated method stub
}
}
4.2 通过@Configuration标签
实例化EscapeInterceptor 拦截器。
package com.zzg.config;
import java.util.Properties;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.zzg.sql.interceptor.EscapeInterceptor;
import com.github.pagehelper.PageHelper;
@Configuration
public class MyBatisConfig {
@Bean
public EscapeInterceptor getEscapeInterceptor(){
EscapeInterceptor interceptor = new EscapeInterceptor();
return interceptor;
}
@Bean
public PageHelper pageHelper() {
PageHelper pageHelper = new PageHelper();
Properties p = new Properties();
p.setProperty("offsetAsPageNum", "true");
p.setProperty("rowBoundsWithCount", "true");
p.setProperty("reasonable", "true");
p.setProperty("dialect", "mysql");
pageHelper.setProperties(p);
return pageHelper;
}
}
效果展示:
总结
以上为个人经验,希望能给大家一个参考,也希望大家多多支持编程网。