extjs 动态加载列表，优化思路

功能截图

之前做法，先查询每一行的前4个字段，然后动态拼接出其他的字段，效率极低，以下是优化后的代码，供参考，只提供一个优化思路，授人以鱼不如授人以渔

后台Sql语句优化(语法仅支持Oracle)

SELECT PROJ_NO,
       ALL_SECTION,
       GRAND_SEC,
       SPCID,
       FIR_SCH_ID_1166,
       BEGIN_DATE_1166,
       END_DATE_1166,
       FLOAT_CYC_1166,
       FIR_SCH_ID_1167,
       BEGIN_DATE_1167,
       END_DATE_1167,
       FLOAT_CYC_1167,
       FIR_SCH_ID_1168,
       BEGIN_DATE_1168,
       END_DATE_1168,
       FLOAT_CYC_1168,
       FIR_SCH_ID_1169,
       BEGIN_DATE_1169,
       END_DATE_1169,
       FLOAT_CYC_1169,
       FIR_SCH_ID_1170,
       BEGIN_DATE_1170,
       END_DATE_1170,
       FLOAT_CYC_1170,
       FIR_SCH_ID_1171,
       BEGIN_DATE_1171,
       END_DATE_1171,
       FLOAT_CYC_1171,
       FIR_SCH_ID_1172,
       BEGIN_DATE_1172,
       END_DATE_1172,
       FLOAT_CYC_1172,
       FIR_SCH_ID_1173,
       BEGIN_DATE_1173,
       END_DATE_1173,
       FLOAT_CYC_1173,
       FIR_SCH_ID_1174,
       BEGIN_DATE_1174,
       END_DATE_1174,
       FLOAT_CYC_1174,
       FIR_SCH_ID_1175,
       BEGIN_DATE_1175,
       END_DATE_1175,
       FLOAT_CYC_1175,
       FIR_SCH_ID_1176,
       BEGIN_DATE_1176,
       END_DATE_1176,
       FLOAT_CYC_1176,
       FIR_SCH_ID_1177,
       BEGIN_DATE_1177,
       END_DATE_1177,
       FLOAT_CYC_1177,
       FIR_SCH_ID_1178,
       BEGIN_DATE_1178,
       END_DATE_1178,
       FLOAT_CYC_1178,
       FIR_SCH_ID_1179,
       BEGIN_DATE_1179,
       END_DATE_1179,
       FLOAT_CYC_1179,
       ALL_SECTION_BEGIN_DATE,
       ALL_SECTION_BEGIN_DATE2
  FROM (SELECT Y.PROJ_NO,
               Y.SPCID,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1166, Y.FIR_SCH_ID)) FIR_SCH_ID_1166,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1166, Y.BEGIN_DATE)) BEGIN_DATE_1166,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1166, Y.END_DATE)) END_DATE_1166,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1166, Y.FLOAT_CYC)) FLOAT_CYC_1166,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1167, Y.FIR_SCH_ID)) FIR_SCH_ID_1167,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1167, Y.BEGIN_DATE)) BEGIN_DATE_1167,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1167, Y.END_DATE)) END_DATE_1167,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1167, Y.FLOAT_CYC)) FLOAT_CYC_1167,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1168, Y.FIR_SCH_ID)) FIR_SCH_ID_1168,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1168, Y.BEGIN_DATE)) BEGIN_DATE_1168,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1168, Y.END_DATE)) END_DATE_1168,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1168, Y.FLOAT_CYC)) FLOAT_CYC_1168,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1169, Y.FIR_SCH_ID)) FIR_SCH_ID_1169,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1169, Y.BEGIN_DATE)) BEGIN_DATE_1169,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1169, Y.END_DATE)) END_DATE_1169,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1169, Y.FLOAT_CYC)) FLOAT_CYC_1169,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1170, Y.FIR_SCH_ID)) FIR_SCH_ID_1170,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1170, Y.BEGIN_DATE)) BEGIN_DATE_1170,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1170, Y.END_DATE)) END_DATE_1170,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1170, Y.FLOAT_CYC)) FLOAT_CYC_1170,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1171, Y.FIR_SCH_ID)) FIR_SCH_ID_1171,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1171, Y.BEGIN_DATE)) BEGIN_DATE_1171,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1171, Y.END_DATE)) END_DATE_1171,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1171, Y.FLOAT_CYC)) FLOAT_CYC_1171,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1172, Y.FIR_SCH_ID)) FIR_SCH_ID_1172,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1172, Y.BEGIN_DATE)) BEGIN_DATE_1172,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1172, Y.END_DATE)) END_DATE_1172,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1172, Y.FLOAT_CYC)) FLOAT_CYC_1172,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1173, Y.FIR_SCH_ID)) FIR_SCH_ID_1173,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1173, Y.BEGIN_DATE)) BEGIN_DATE_1173,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1173, Y.END_DATE)) END_DATE_1173,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1173, Y.FLOAT_CYC)) FLOAT_CYC_1173,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1174, Y.FIR_SCH_ID)) FIR_SCH_ID_1174,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1174, Y.BEGIN_DATE)) BEGIN_DATE_1174,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1174, Y.END_DATE)) END_DATE_1174,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1174, Y.FLOAT_CYC)) FLOAT_CYC_1174,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1175, Y.FIR_SCH_ID)) FIR_SCH_ID_1175,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1175, Y.BEGIN_DATE)) BEGIN_DATE_1175,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1175, Y.END_DATE)) END_DATE_1175,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1175, Y.FLOAT_CYC)) FLOAT_CYC_1175,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1176, Y.FIR_SCH_ID)) FIR_SCH_ID_1176,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1176, Y.BEGIN_DATE)) BEGIN_DATE_1176,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1176, Y.END_DATE)) END_DATE_1176,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1176, Y.FLOAT_CYC)) FLOAT_CYC_1176,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1177, Y.FIR_SCH_ID)) FIR_SCH_ID_1177,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1177, Y.BEGIN_DATE)) BEGIN_DATE_1177,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1177, Y.END_DATE)) END_DATE_1177,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1177, Y.FLOAT_CYC)) FLOAT_CYC_1177,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1178, Y.FIR_SCH_ID)) FIR_SCH_ID_1178,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1178, Y.BEGIN_DATE)) BEGIN_DATE_1178,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1178, Y.END_DATE)) END_DATE_1178,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1178, Y.FLOAT_CYC)) FLOAT_CYC_1178,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1179, Y.FIR_SCH_ID)) FIR_SCH_ID_1179,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1179, Y.BEGIN_DATE)) BEGIN_DATE_1179,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1179, Y.END_DATE)) END_DATE_1179,
               MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, 1179, Y.FLOAT_CYC)) FLOAT_CYC_1179,
               Y.ALL_SECTION,
               Y.ALL_SECTION_BEGIN_DATE,
               Y.ALL_SECTION_BEGIN_DATE2,
               Y.GRAND_SEC
          FROM (SELECT FSI.PROJ_NO,
                       FSI.SPCID,
                       FSI.STANDA_SCHEDULE_NODE_ID,
                       SSN.NODE_NAME,
                       SSN.NODE_SEQ,
                       FSI.BEGIN_DATE,
                       FSI.END_DATE,
                       FSI.FLOAT_CYC,
                       FSI.ALL_SECTION,
                       FSI.ALL_SECTION_BEGIN_DATE,
                       FSI.ALL_SECTION_BEGIN_DATE2,
                       FSI.FIR_SCH_ID,
                       FSI.GRAND_SEC
                  FROM FIRST_SCHEDULE_INFO_VIEW FSI
                  LEFT JOIN STANDA_SCHEDULE_NODE SSN
                    ON SSN.STANDA_SCHEDULE_NODE_ID =
                       FSI.STANDA_SCHEDULE_NODE_ID
                 WHERE 1 = 1
                   AND PROJ_NO = 366
                   AND FVERSION_ID = 26) Y
         GROUP BY Y.PROJ_NO,
                  Y.SPCID,
                  Y.ALL_SECTION,
                  Y.ALL_SECTION_BEGIN_DATE,
                  Y.GRAND_SEC,
                  Y.ALL_SECTION_BEGIN_DATE2)

后台逻辑，拼接Sql语句

                string ssnSql = string.Format("SELECT T.* FROM STANDA_SCHEDULE_NODE T WHERE T.STANDA_SCHEDULE_ID = {1} AND T.IS_DEL = '8' {0} ORDER BY T.NODE_SEQ", StringUtil.isNotNullOrBlank(ssnIds) ? "AND T.STANDA_SCHEDULE_NODE_ID IN (" + ssnIds.Replace(DbUtil.colSplit, ',') + ")" : "", PlanUtil.FirstScheduleS);
                DataTable ssndt = DbUtil.QueryDT(ssnSql);
                StringBuilder sb = new StringBuilder();
                if (ssndt.Rows.Count > 0)
                {
                    List ssnList = BeanUtil.ToEntity(ssndt);

                    foreach (Standa_Schedule_Node ssn in ssnList)
                    {
                        sb.Append(string.Format("MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, {0}, Y.FIR_SCH_ID)) FIR_SCH_ID_{0},", ssn.Standa_Schedule_Node_Id));
                        sb.Append(string.Format("MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, {0}, Y.BEGIN_DATE)) BEGIN_DATE_{0},", ssn.Standa_Schedule_Node_Id));
                        sb.Append(string.Format("MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, {0}, Y.END_DATE)) END_DATE_{0},", ssn.Standa_Schedule_Node_Id));
                        sb.Append(string.Format("MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, {0}, Y.FLOAT_CYC)) FLOAT_CYC_{0},", ssn.Standa_Schedule_Node_Id));
                        sb.Append(string.Format("MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, {0}, Y.E_BEGIN_DATE)) E_BEGIN_DATE_{0},", ssn.Standa_Schedule_Node_Id));
                        sb.Append(string.Format("MAX(DECODE(Y.STANDA_SCHEDULE_NODE_ID, {0}, Y.E_END_DATE)) E_END_DATE_{0},", ssn.Standa_Schedule_Node_Id));
                    }
                }
                string conditionSql = "";
                conditionSql = sb.ToString();

                string querySql = @"SELECT {2}
  FROM (SELECT Y.PROJ_NO,
               Y.SPCID,
               {0} Y.ALL_SECTION,
               Y.ALL_SECTION_BEGIN_DATE,
               Y.ALL_SECTION_BEGIN_DATE2,
               Y.GRAND_SEC
          FROM (SELECT FSI.PROJ_NO,
                       FSI.SPCID,
                       FSI.STANDA_SCHEDULE_NODE_ID,
                       SSN.NODE_NAME,
                       SSN.NODE_SEQ,
                       FSI.BEGIN_DATE,
                       FSI.END_DATE,
                       FSI.E_BEGIN_DATE,
                       FSI.E_END_DATE,
                       FSI.FLOAT_CYC,
                       FSI.ALL_SECTION,
                       FSI.ALL_SECTION_BEGIN_DATE,
                       FSI.ALL_SECTION_BEGIN_DATE2,
                       FSI.FIR_SCH_ID,
                       FSI.GRAND_SEC
                  FROM FIRST_SCHEDULE_INFO_VIEW FSI
                  LEFT JOIN STANDA_SCHEDULE_NODE SSN
                    ON SSN.STANDA_SCHEDULE_NODE_ID =
                       FSI.STANDA_SCHEDULE_NODE_ID {1}) Y
         GROUP BY Y.PROJ_NO,
                  Y.SPCID,
                  Y.ALL_SECTION,
                  Y.ALL_SECTION_BEGIN_DATE,
                  Y.GRAND_SEC,
                  Y.ALL_SECTION_BEGIN_DATE2)";
                if (StringUtil.isNotNullOrBlank(v.Page) && v.Page != "-1")
                {
                    int total = 0;
                    v.Dt = DbUtil.Query(String.Format(querySql, conditionSql, DbUtil.WHEREOTO + v.getCondition(), StringUtil.nullOrBlankTOStr(v.DFields, "*")), v.Start, v.Limit, ref total);
                    v.Total = total;
                }
                else
                {
                    v.Dt = DbUtil.QueryDT(string.Format(querySql, conditionSql, DbUtil.WHEREOTO + v.getCondition(), StringUtil.nullOrBlankTOStr(v.DFields, "*")));
                }
                return v.Dt;

Oracle Decode函数用法，可参考：https://www.cnblogs.com/Lightning-Kid/p/3954202.html