springboot后端實現條件查詢，要配合使用mybatis

package cn.com.dyg.work.sqlgen;

import cn.com.dyg.work.common.exception.DefException;
import cn.com.dyg.work.common.utils.CamelAndUnderLineConverter;
import com.alibaba.fastjson.JSONArray;
import org.apache.ibatis.jdbc.SQL;
import org.springframework.util.StringUtils;

import java.util.List;
import java.util.Map;

/**
 * 多種方式查詢，根據前台傳送的json來拼接sql語句，使查詢更加靈活。
 */
public class ActivityAppSqlGenerator {
    /**
     * 根據mp里面的條件來查詢活動申請數據
     *
     * @param mp 條件
     * @return 活動申請sql
     */
    public String queryActivityAppData(final Map<String, Object> mp) {
        Boolean flag = (Boolean) mp.get("flag");
        SQL sql = new SQL() {
            {
                if (flag)
                    SELECT(" app.* ");
                else
                    SELECT("count(*)");
                FROM("crm_academic_activity_app app");
                LEFT_OUTER_JOIN(" crm_flowinfo info on app.id=info.pk_src and IFNULL(info.dr,0)=0 ");

                JSONArray jsonArray = (JSONArray) mp.get("jsonArray");
                if (jsonArray != null)
                    for (int i = 0; i < jsonArray.size(); i++) {
                        Object item = jsonArray.get(i);
                        @SuppressWarnings("unchecked") Map<String, Object> map = (Map<String, Object>) item;
                        if (map.size() != 3)
                            throw new DefException("查詢條件有問題。");
                        String column = (String) map.get("column");
                        if (StringUtils.isEmpty(column))
                            throw new DefException("column不可以為空。");
                        String fieldName;
                        if ("status".equalsIgnoreCase(column))
                            fieldName = "IFNULL(info.status,1)";
                        else
                            fieldName = "app." + CamelAndUnderLineConverter.humpToLine2(column);
                        String opt = ((String) map.get("opt")).toLowerCase().trim();
                        switch (opt) {
                            case "<":
                            case ">":
                            case "=":
                            case "<=":
                            case ">=":
                                WHERE(fieldName + " " + opt + " #{ jsonArray[" + i + "].value} ");
                                break;
                            case "like":
                                WHERE(fieldName + " " + opt + " concat('%',#{jsonArray[" + i + "].value},'%') ");
                                break;
                            case "order":
                                String value = (String) map.get("value");
                                String suffix = "desc";
                                if (!StringUtils.isEmpty(value) && value.startsWith("asc"))
                                    suffix = "asc";

                                ORDER_BY(fieldName + " " + suffix);
                                break;
                            case "in":
                                WHERE(fieldName + " in (" + getInSql((List) map.get("value"), i) + ")");
                                break;
                            case "between":
                                WHERE(fieldName + " between #{jsonArray[" + i + "].value[0]} and #{jsonArray[" + i + "].value[1]} ");
                                break;
                            default:
                                throw new DefException("查詢條件有問題。");
                        }
                    }
                WHERE("app.dr=0");
                ORDER_BY("app.ts desc ");
            }
        };
        if (flag)
            return sql.toString() + " limit #{pageindex},#{pagenum} ";
        else
            return sql.toString();
    }

    /**
     * 拼接in查詢條件
     *
     * @param ls 集合
     * @param i  當前條件所處的位置
     * @return 查詢條件
     */
    private String getInSql(List ls, int i) {
        if (ls == null || ls.size() == 0)
            return "('')";
        StringBuilder sb = new StringBuilder();
        int c = 0;
        for (Object ignored : ls) {
            sb.append("#{jsonArray[").append(i).append("].value[").append(c++).append("]}");
            sb.append(",");
        }
        return (sb.substring(0, sb.length() - 1));
    }
}

mybatis，使用provider來讀取傳入的參數構造查詢語句
1 @SelectProvider(type = ActivityAppSqlGenerator.class, method = "queryActivityAppData")
List<ActivityAppDO> selectAll(@Param("pageindex") Integer pageindex, @Param("pagenum") Integer pagenum,
                                  @Param("jsonArray") JSONArray jsonArray, @Param("flag") Boolean flag);