21 lines
470 B
Python
21 lines
470 B
Python
import sqlite3
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class MySum:
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def __init__(self):
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self.count = 0
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def step(self, value):
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self.count += value
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def finalize(self):
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return self.count
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con = sqlite3.connect(":memory:")
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con.create_aggregate("mysum", 1, MySum)
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cur = con.cursor()
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cur.execute("create table test(i)")
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cur.execute("insert into test(i) values (1)")
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cur.execute("insert into test(i) values (2)")
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cur.execute("select mysum(i) from test")
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print cur.fetchone()[0]
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