使用Linq EF的动态列

Question

我需要使用 EF 创建 Linq lambda 语句。

我有4个固定表（不包括参考表），需要加入。但是需要检索的列名称是基于引用表中的列名称的。

如上图所示，DB_TABLE列是需要连接表的列（请忽略.SHIPTO和.CONSIGNEE，仅需REL_BATCH_PARTY ）。 DB_FIELD列是我需要选择的列。

示例

SUBSTR({0}CONTACT_PHONE,0,8)

所以我需要像SUBSTR(REL_BATCH_PARTY.CONTACT_PHONE,0,8)。 {0}将替换为表名。

这是基于引用表的最终SQL语句：

SELECT *
FROM
  (SELECT
     (SELECT substr(REL_BATCH_PARTY.CONTACT_PHONE, 0, 8)
      FROM REL_BATCH_PARTY
      WHERE REL_BATCH_PARTY.REL_BATCH_ID = REL_BATCH.ID
        AND REL_BATCH_PARTY.TYPE_CODE = 'SHIPTO') CONTACT_PHONE_SUBSTR,

     (SELECT REL_BATCH_PARTY.CONTACT_PHONE
      FROM REL_BATCH_PARTY
      WHERE REL_BATCH_PARTY.REL_BATCH_ID = REL_BATCH.ID
        AND REL_BATCH_PARTY.TYPE_CODE = 'SHIPTO') CONTACT_PHONE,
          TO_CHAR(SYSDATE, 'dd-MM-yyyy') TODAY,
          REL_BATCH.REL_NO,

     (SELECT REL_BATCH_PARTY.ADDR01
      FROM REL_BATCH_PARTY
      WHERE REL_BATCH_PARTY.REL_BATCH_ID = REL_BATCH.ID
        AND REL_BATCH_PARTY.TYPE_CODE = 'CONSIGNEE') ADDR01,
          REL_BATCH_CONTAINER.CONTAINER_NO,
          ROW_NUMBER() OVER(PARTITION BY REL_BATCH.ID
                            ORDER BY REL_BATCH_CONTAINER.ID, REL_BATCH_PARTY.TYPE_CODE) num
   FROM REL_BATCH REL_BATCH
   LEFT JOIN REL_BATCH_PARTY REL_BATCH_PARTY ON REL_BATCH.ID = REL_BATCH_PARTY.REL_BATCH_ID
   LEFT JOIN REL_BATCH_CONTAINER REL_BATCH_CONTAINER ON REL_BATCH.ID = REL_BATCH_CONTAINER.REL_BATCH_ID WHERE ..... )A
WHERE A.NUM = 1

是否总有使用Linq Lambda表达式创建的内容？

DB_FIELD列和行将根据参考表中的用户输入而动态变化。 DB_TABLE仅使用这4个表（REL_BATCH，REL_BATCH_PARTY，REL_BATCH_ATTR，REL_BATCH_CONTAINER）。关系是ID中的REL_BATCH在所有其他3个表中都具有外键。

谢谢。