我一直在追逐这个错误一周:
pyodbc.Error: ('HY000', '[HY000] [Vertica][VerticaDSII] (20) An error occurred during query execution: (20) (SQLFetch)')
经过大量试验和错误后,关键是此特定SELECT
查询(较简单的不发生错误)以及commit()
之后对curs.execute()
的调用的组合。我真的很想听听你的想法。下面(后面是配置信息)就是一个例子。任何帮助理解为什么会发生这种情况将非常感激。我很乐意提供更多细节,如果有帮助的话。
版本:
来源:
import pyodbc
query = '''
SELECT relVarTable0.id AS id, relVarTable1.val, relVarTable2.val, relVarTable3.val, relVarTable4.val
FROM (SELECT id FROM B) relVarTable0
LEFT JOIN
(SELECT B1.id AS id, AVG(A1.X) AS val
FROM B B1, AB AB1, A A1
WHERE B1.id = AB1.B_id AND A1.id = AB1.A_id AND A1.X IS NOT NULL
GROUP BY B1.id) relVarTable1
ON relVarTable0.id = relVarTable1.id
LEFT JOIN
(SELECT B1.id AS id, B1.Y AS val
FROM B B1
WHERE B1.Y IS NOT NULL ) relVarTable2
ON relVarTable0.id = relVarTable2.id
LEFT JOIN
(SELECT B1.id AS id, AVG(A1.W) AS val
FROM B B1, AB AB1, A A1
WHERE B1.id = AB1.B_id AND A1.id = AB1.A_id AND A1.W IS NOT NULL
GROUP BY B1.id) relVarTable3
ON relVarTable0.id = relVarTable3.id
LEFT JOIN
(SELECT B1.id AS id, AVG(C1.Z) AS val
FROM B B1, BC BC1, C C1
WHERE B1.id = BC1.B_id AND C1.id = BC1.C_id AND C1.Z IS NOT NULL
GROUP BY B1.id) relVarTable4
ON relVarTable0.id = relVarTable4.id;
'''
conn = pyodbc.connect('DSN=vertica_kdl_dsn;UserName=__;Password=__)
curs = conn.cursor()
curs.execute('SET search_path TO "$user", rcd_test, public, v_catalog, v_monitor, v_internal;')
curs.execute(query)
curs.commit() # comment out to get no error
rows = curs.fetchall() # if above commit called: pyodbc.Error: ('HY000', '[HY000] [Vertica][VerticaDSII] (20) An error occurred during query execution: (20) (SQLFetch)')
curs.close()
答案 0 :(得分:1)
仅供参考我在Vertica community forum获得了一个简单的解决方案:
在DSN [vertica_kdl_dsn]下的odbc.ini中添加ResultBufferSize = 0 节
(Hy000不是特别有用的错误信息!)