MybatisPlus使用排序查询时将null值放到最后

SELECT * FROM users ORDER BY OPERATE_DATE ASC NULLS LAST 

SELECT * FROM users ORDER BY OPERATE_DATE ASC

if(!ObjectUtils.isEmpty(orderBy)) {
	if(orderBy instanceof Collection) {
		String[] array = ((Collection<?>) orderBy).toArray(new String[0]);
		queryWrapper.orderBy(true, isAsc, Arrays.asList(array));
	}else {
		queryWrapper.orderBy(true, isAsc, orderBy.toString());
	}
}

orderByAscWithNullsLast()

import java.lang.reflect.Field;
import java.sql.Connection;
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.mapping.StatementType;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.reflection.SystemMetaObject;
import org.springframework.util.ReflectionUtils;
import com.baomidou.mybatisplus.core.toolkit.PluginUtils;
/**
 * @description:拦截查询SQL，处理查询SQL中的排序
 * @author:hutao
 * @mail:hutao_2017@aliyun.com
 * @date:2023年7月25日 下午12:17:50
 */
@Intercepts(@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class, Integer.class}))
public class LastNullInterceptor implements Interceptor {
	//,有兴趣，可以看看MybatisPlusInterceptor怎么实现的
    private static final String DESC = "DESC";
    private static final String ASC = "ASC";
    private static final String REPLACE_DESC = "DESC NULLS LAST";
    private static final String REPLACE_ASC = "ASC NULLS LAST";
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
    	StatementHandler handler = PluginUtils.realTarget(invocation.getTarget());
        MetaObject metaObject = SystemMetaObject.forObject(handler);
        // 判断是不是SELECT操作,跳过存储过程
        MappedStatement mappedStatement = (MappedStatement) metaObject.getValue("delegate.mappedStatement");
        if (SqlCommandType.SELECT != mappedStatement.getSqlCommandType()
                || StatementType.CALLABLE == mappedStatement.getStatementType()) {
            return invocation.proceed();
        }
        BoundSql boundSql = handler.getBoundSql();
        String sql = boundSql.getSql().toUpperCase();
        if(sql.contains("ORDER BY")) {
        	sql = this.replaceLast(sql, DESC, REPLACE_DESC);
        	sql = this.replaceLast(sql, ASC, REPLACE_ASC);
        	Field sqlField = boundSql.getClass().getDeclaredField("sql");
        	ReflectionUtils.makeAccessible(sqlField);
        	ReflectionUtils.setField(sqlField, boundSql, sql);
        }
        return invocation.proceed();
    }
    /**
     * @description:替换最后一个字符串
     * @author:hutao
     * @mail:hutao1@epri.sgcc.com.cn
     * @date:2023年7月25日 下午2:22:21
     */
    public String replaceLast(String str, String target, String replacement) {
    	if (str == null || target == null || replacement == null) {
            return str;
        }
        int lastIndex = str.lastIndexOf(target);
        if (lastIndex < 0) {
            return str;
        }
        return str.substring(0, lastIndex) + replacement + str.substring(lastIndex + target.length());
    }
}

@SpringBootConfiguration
public class MybatisConfig {
	@Bean
    public LastNullInterceptor nullsLastInterceptor() {
        return new LastNullInterceptor();
    }
}