Question

我有一个讨厌的，讨厌的数据布局，我被迫与之合作。我终于得到了一个使用C＃的工作查询和for循环执行相同的查询，但调整了哪些字段被调用，但现在我想知道是否可以使用while循环。我收到一个错误，我不确定是不是因为我使用Faircom / C-tree作为数据库，或者我的查询有问题。我通常是一个Mysql用户。

该表有20个我关心的字段，想要提取到csv列表中。它们是codetype1-codetype20，我希望它像value1, value2, value3...一样，现在我一次又一次地取回它们。麻烦的是codetype1依赖于另一个字段来确定我去哪里查找该代码的信息，这就是case语句的原因。

DROP PROCEDURE IF EXISTS proc_loop_test;
CREATE PROCEDURE proc_loop_test()
    SET @index = 1;
    WHILE(@index  < 21) DO

        SELECT Replace(Concat(To_char(apptid), To_char(.@index) ), ' ', '') AS reference_id,
                   apptid                                                              AS a_reference_id,
                   CASE
                     WHEN c.ee > 0 THEN d.amt
                     ELSE insfee.amt
                   END                                                    AS amount,
                   CASE
                     WHEN c.ee > 0 THEN Rtrim(e.moneyname)
                     ELSE insname.namefeecatid
                   END                                                    AS moneyschedule_name,
                   CASE codetype@index
                              WHEN 1 THEN rtrim(a.descript)
                              ELSE rtrim(b.descript0)
                   END                                                                  AS description,
                   CASE codetype@index
                              WHEN 1 THEN rtrim(a.abbrevdescript)
                              ELSE rtrim(b.abbrev0)
                   END                                                                  AS abbreviated_description,
                   CASE codetype@index
                              WHEN 1 THEN rtrim(a.thiscode)
                              ELSE rtrim(b.thiscode0)
                   END AS code
        FROM       meetings
        LEFT JOIN
                   (
                        SELECT     admin.table2.procid,
                                    admin.table2.this_code_id,
                                    admin.v_table1.descript,
                                    admin.v_table1.abbrevdescript,
                                    admin.v_table1.thiscode
                        FROM       admin.table2
                        INNER JOIN admin.v_table1
                        ON         admin.table2.this_code_id = admin.v_table1.this_code_id) AS a
        ON         meetings.codeid@index = a.procid
        LEFT JOIN
                   (
                          SELECT admin.v_table1.descript       AS descript0,
                                 admin.v_table1.abbrevdescript AS abbrev0,
                                 admin.v_table1.thiscode        AS thiscode0,
                                 admin.v_table1.this_code_id
                          FROM   admin.v_table1) AS b
        ON         meetings.codeid@index = b.this_code_id
        LEFT JOIN
                   (
                          SELECT patid AS id,
                                 ee
                          FROM   admin.customer) AS c
        ON         meetings.patid = c.id
        LEFT JOIN
                   (
                          SELECT this_code_id AS redid,
                                 eecategoryid,
                                 amt
                          FROM   admin.eeule) AS d
        ON         c.ee = d.eecategoryid
        AND        d.redid = b.this_code_id
        LEFT JOIN
                   (
                          SELECT eecategoryid AS namefeecatid,
                                 moneyname
                          FROM   admin.eeulenames) AS e
        ON         d.eecategoryid = e.namefeecatid
        LEFT JOIN (SELECT pi.customer_id,
                            pi.primarykk_id AS picid,
                            pi.primarykk_name,
                            pi.first_name,
                            pi.last_name,
                            i.groupname,
                            i.ee
                    FROM   admin.v_pir AS pi
                            LEFT JOIN admin.money AS i
                                ON pi.primarykk_id = i.insid) AS
                    ins
                ON ins.customer_id = c.id
        LEFT JOIN (SELECT this_code_id AS redid,
                            eecategoryid,
                            amt
                    FROM   admin.eeule) AS insfee
                ON ins.ee = insfee.eecategoryid
                    AND insfee.redid = b.this_code_id
       LEFT JOIN (SELECT eecategoryid AS namefeecatid,
                         moneyname
                  FROM   admin.eeulenames) AS insname
              ON insfee.eecategoryid = insname.namefeecatid
        WHERE      codeid@index >= 1
    END WHILE;
END;

我从来没有使用过while循环，虽然我有点理解我应该选择这个去INTO东西，我是否需要创建一个临时表，或者它可以只存储在内存中直到结束循环并返回。

对于它的价值，当您用@index连接格式替换" . index . "时，整个SELECT查询都在C＃中工作

Answer 1

根据您提供的信息，强烈建议您与供应商联系。但是，您尝试使用mySQL专有语法创建存储过程。存储过程支持对每个数据库供应商都是唯一的。 FairCom的c-treeACE SQL实际上使用Java进行跨平台支持，使用.NET进行Windows。

https://docs.faircom.com/doc/jspt/#cover.htm

存储过程开发需要强烈的数据库布局知识，这是高度依赖于应用程序的。在这种情况下，可能涉及许多遗留应用程序依赖性。同样，您的最佳信息来源将是您的应用程序供应商。

while循环用于选择字段名称？

1 个答案: