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47 lines
1.2 KiB
Python
47 lines
1.2 KiB
Python
import sqlite3
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class Point:
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def __init__(self, x, y):
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self.x, self.y = x, y
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def __repr__(self):
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return "(%f;%f)" % (self.x, self.y)
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def adapt_point(point):
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return ("%f;%f" % (point.x, point.y)).encode('ascii')
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def convert_point(s):
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x, y = list(map(float, s.split(b";")))
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return Point(x, y)
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# Register the adapter
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sqlite3.register_adapter(Point, adapt_point)
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# Register the converter
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sqlite3.register_converter("point", convert_point)
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p = Point(4.0, -3.2)
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#########################
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# 1) Using declared types
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con = sqlite3.connect(":memory:", detect_types=sqlite3.PARSE_DECLTYPES)
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cur = con.cursor()
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cur.execute("create table test(p point)")
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cur.execute("insert into test(p) values (?)", (p,))
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cur.execute("select p from test")
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print("with declared types:", cur.fetchone()[0])
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cur.close()
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con.close()
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#######################
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# 1) Using column names
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con = sqlite3.connect(":memory:", detect_types=sqlite3.PARSE_COLNAMES)
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cur = con.cursor()
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cur.execute("create table test(p)")
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cur.execute("insert into test(p) values (?)", (p,))
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cur.execute('select p as "p [point]" from test')
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print("with column names:", cur.fetchone()[0])
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cur.close()
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con.close()
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