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[英]How can I safely create a query that will list column names given a table name, and a connection string which may point to SQL Server or MySQL?
[英]extract column names and table name from any “SQL query” String
考慮我有一個這樣的 SQL 查詢:
SELECT c_mandant,
hist_datum,
parkey1,
parkey2,
funktionscode,
ma_parkey,
me_parkey ,
CASE
WHEN EXISTS
(
SELECT 1
FROM cds_h_gruppe GRP1
WHERE grp1.c_mandant = c_mandant
AND grp1.hist_datum = Add_months(Last_day(Trunc(sysdate)), -1)
AND grp1.funktionscode = 'H'
AND grp1.parkey1 = ma_parkey
) THEN 1
ELSE NULL
END ma_me ,
CASE
WHEN EXISTS
(
SELECT 1
FROM cds_h_gruppe GRP2
WHERE grp2.c_mandant = c_mandant
AND grp2.hist_datum = Add_months(Last_day(Trunc(sysdate)), -1)
AND grp2.funktionscode = 'U'
AND grp2.parkey1 = me_parkey
) THEN 1
ELSE NULL
END me_ma,
Row_number() OVER (partition BY c_mandant, ma_parkey, me_parkey ORDER BY c_mandant, ma_parkey, me_parkey) anz_ma
FROM
(
SELECT c_mandant,
hist_datum,
parkey1,
parkey2,
funktionscode ,
CASE
WHEN funktionscode = 'U' THEN parkey1
ELSE parkey2
END ma_parkey ,
CASE
WHEN funktionscode = 'U' THEN NULL
ELSE parkey1
END me_parkey
FROM cds_h_gruppe
WHERE funktionscode IN ('U',
'H')
AND hist_datum = Add_months(Last_day(Trunc(sysdate)), -1)
我想從查詢中提取表名和列名。 結果應該看起來像
表格:
CDS_H_GRUPPE
列:
CDS_H_GRUPPE.c_mandant
CDS_H_GRUPPE.funktionscode
CDS_H_GRUPPE.hist_datum
CDS_H_GRUPPE.parkey1
CDS_H_GRUPPE.parkey2
我可以從任何對 Oracle、SQL Server 或 DB2 有效的復雜查詢字符串中提取列名和表名嗎?
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