postgresql和kingbase关于模糊查询大小写兼容问题

在mysql中，会有相关的like关键词，并且默认的是忽略大小写的。但是在postgresql和kingbase中，只有ilike关键字，并且默认是大小写敏感的。当我们使用mybatisplus的时候，默认提供的api也只有like()。这里提供一种方式来对原始api进行拓展

import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.SqlCommandType;
import org.apache.ibatis.plugin.*;
import org.apache.ibatis.reflection.DefaultReflectorFactory;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;
import org.springframework.stereotype.Component;
import java.lang.reflect.Field;
import java.sql.Connection;
import java.util.Properties;/*** sql查询拦截器* <p>* 模糊查询时忽略大小写* </p>* @author lsh* @version 1.0* @date 2022/5/10 11:13*/
@Slf4j
@Component
@Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class, Integer.class})})
public class FuzzyQueryInterceptor implements Interceptor{private static final String FUZZY_QUERY_KEY = "like";private static final String IGNORE_FUZZY_QUERY_KEY = "ilike";@Overridepublic Object intercept(Invocation invocation) throws Throwable {// 这里添加判断容器中是否为KingBase获取postgresql的代码//拦截StatementHandler，获取Mybatis对象属性StatementHandler statementHandler = (StatementHandler) invocation.getTarget();MetaObject metaObject = MetaObject.forObject(statementHandler, SystemMetaObject.DEFAULT_OBJECT_FACTORY, SystemMetaObject.DEFAULT_OBJECT_WRAPPER_FACTORY,new DefaultReflectorFactory());MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");//执行mapper方法的全路径名String id = mappedStatement.getId();//只拦截查询语句，将like关键字替换成ilike，以忽略大小写if (SqlCommandType.SELECT.equals(mappedStatement.getSqlCommandType())){BoundSql boundSql = statementHandler.getBoundSql();String sql = boundSql.getSql();sql=sql.replaceAll("\\s+"," ");if (StringUtils.containsIgnoreCase(sql," like ") || StringUtils.containsIgnoreCase(sql," like ?")){String mSql = sql.replaceAll("(?i)"+FUZZY_QUERY_KEY ,IGNORE_FUZZY_QUERY_KEY )log.debug(id + "：原始查询语句 ==> " + sql);log.debug(id + "：替换后的查询语句 ==> " + mSql);//通过反射修改sql语句Field field = boundSql.getClass().getDeclaredField("sql");field.setAccessible(true);field.set(boundSql, mSql);}}//执行结果return invocation.proceed();}@Overridepublic Object plugin(Object target) {return Plugin.wrap(target, this);}@Overridepublic void setProperties(Properties properties) {}
}