SQLRPGLE。我的 SQL 查询有问题吗？

Question

这是我试图在我的程序中运行的 SQL 查询。但是我什至无法编译它，我收到一个错误，只是告诉我查询中有问题。

我得到的错误是“SQL0117 语句包含错误数量的值”。

/Free                                                        
   exec sql                                                  
   INSERT INTO NOEDTSR                                       
        SELECT * FROM NOEDEH AS deh                          
        WHERE EXISTS (SELECT act.AC2ACT FROM ACTEST AS act   
                              WHERE  act.AC2ACT = deh.N1ACTE 
                              AND    act.AC2CRB IN('C0','C2')
                              AND    act.AC2TYT = 'DEN')     
        AND   NOT EXISTS (SELECT sin.SISTE FROM SINREG AS sin
                              WHERE  sin.SISTE  = deh.N1STE  
                              AND    sin.SIGRP  = deh.N1GRP
                              AND    sin.SIIND  = deh.N1IND   
                              AND    sin.SIRANG = deh.N1RANG  
                              AND    sin.SIACTE = deh.N1ACTE  
                              AND    sin.SIREEL = deh.N1MERG  
                              AND    sin.SISECU = deh.N1EBAS) 
         AND N1DBSS = 20                                       
         AND N1DBSA = 21                                       
         AND N1TIER = '000000000000000';                       
 /end-free                                                       

我不是故意在此处指定 column_names，因为我想将所有列从 NOEDEH 复制到 NOEDTSR。
这两个表的结构相同，用于编译两者的DDS(Data Description Structure)完全相同。

有什么想法吗？

Answer 1

您已经弄清楚了您的问题。 Mark 提供了一个简单的 SQL 来轻松生成包含列列表的字符串。

这是我随身携带的一条 SQL 语句。它将允许您生成以下内容之一：

• 短列名的字符串
• 长列名称的字符串
• 使用短名称的 rpg 数据结构
• 使用长名称的 rpg 数据结构

只需取消注释语句底部相应的 select * 行即可。

with selected (system_table_name, system_table_schema) 
     --  enter file & library name here
  as (values ('MYTABLE','MYLIB') )
, tbl as (
select 
        case
           when data_type = 'DECIMAL' then 'packed'
           when data_type = 'NUMERIC' then 'zoned'
           when data_type = 'TIMESTMP' then 'timestamp'
           when data_type = 'INTEGER' then 'int'
           else lower(data_type)  
         end
        concat case
                 when data_type = 'INTEGER' and length >= 8 then '(20'
                 when data_type = 'INTEGER' and length >= 4 then '(10'
                 when data_type = 'INTEGER' and length >= 2 then '(5'
                 when data_type in ('TIMESTMP','DATE','TIME') then '' 
                 else '(' concat length
               end
        concat case 
                 when numeric_scale is null then ''
                 when data_type = 'INTEGER' then ''
                 else ':' concat numeric_scale
               end
        concat case
                 when data_type in ('TIMESTMP','DATE','TIME') then ';'   
                 else ');' 
               end 
        as rpg_type 
,system_column_name, length, numeric_scale,
column_text, column_name, ordinal_position
from qsys2.syscolumns syscolumns
 join selected using(system_table_name,system_table_schema)
)
-- build RPG DS
, rpg_ds as (
 select lower(system_column_name) concat ' ' concat rpg_type as rpg_ds_subfield
   from tbl
 order by ordinal_position
)
-- build rpg long name ds
, rpg_ds_long_name as (
 select lower(column_name) concat ' ' concat rpg_type as rpg_ds_subfield
   from tbl
 order by ordinal_position
)
---- build a string of all columns in the table using short names
, list_short_names as (
select listagg(lower(trim(system_column_name)),', ') 
    within group (order by ordinal_position)
from tbl
)
---- build a string of all columns in the table using short names
, list_long_names as (
select listagg(lower(trim(column_name)),', ') 
    within group (order by ordinal_position)
from tbl
)
-- use one of these depending on what you're looking for
--select * from rpg_ds_long_name;
--select * from rpg_ds;
--select * from list_long_names;
select * from list_short_names;