videotask-service/src/main/java/com/hongliang/videotask/MapperProvider/NodeProvider.java

package com.hongliang.videotask.MapperProvider;

import org.apache.ibatis.annotations.Param;

import java.util.Map;

public class NodeProvider {
    /**
     * 组合条件查询
     * @param condition 包含pageNum,pageSize,查询字段项,orderby
     * @return
     */
    public String  GetNodeList(Map<String,Object> condition){
//        System.out.println("condition:"+condition.toString());
        // 使用StringBuilder来拼接SQL
        StringBuilder sb=new StringBuilder();
        sb.append("select * from node where 1=1");

        //开如拼接查询条件
        if (condition.containsKey("nodename")){
            sb.append(" and nodename like concat('%', #{nodename},'%')");
        }

        //……如果有其他条件，就继续

        //如果有排序
        if (condition.containsKey("orderby")){
            sb.append(" order by #{orderby}");
        }

        //拼接分页
        if (condition.containsKey("offset") && condition.containsKey("pageSize")){
            sb.append(" limit #{offset},#{pageSize}");
        }

        //返回sql语句
        return sb.toString();
    }
}