Question

为什么我的代码只插入一行？

thewholeenchilada = ("SELECT SUBSTR(email, (SELECT INSTR(email,'@'))) AS org, SUM(count) as count FROM Em GROUP BY org ORDER BY count DESC")

for salida in cur.execute(thewholeenchilada):
    cur.execute('''INSERT INTO Counts (org, count)
                VALUES (?, ?)''', (salida[0],row[1]))

    print((str(salida[0]), salida[1]))
    conn.commit()

Answer 1

避免循环并运行一个INSERT INTO ... SELECT查询。现在，您在循环内部和外部重复使用了相同的游标，从而导致处理问题。要么使用两个不同的游标，要么有效地组合起来并让数据库引擎运行动作查询：

sql = '''INSERT INTO Counts (org, [count])
         SELECT SUBSTR(email, INSTR(email, '@')+1) AS org, 
                SUM(count) as [count]
         FROM Em 
         GROUP BY org 
         ORDER BY count DESC
      '''

cur.execute(sql)
conn.commit()

Python在SQLite数据库上仅插入一行

1 个答案: