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7d2c39752f
As argparse now detects by default when the code was run as a module.
This leads to using the actual executable name instead of simply "python"
to display in the usage message ("usage: python -m ...").
131 lines
3.8 KiB
Python
131 lines
3.8 KiB
Python
"""A simple SQLite CLI for the sqlite3 module.
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Apart from using 'argparse' for the command-line interface,
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this module implements the REPL as a thin wrapper around
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the InteractiveConsole class from the 'code' stdlib module.
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"""
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import sqlite3
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import sys
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from argparse import ArgumentParser
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from code import InteractiveConsole
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from textwrap import dedent
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def execute(c, sql, suppress_errors=True):
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"""Helper that wraps execution of SQL code.
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This is used both by the REPL and by direct execution from the CLI.
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'c' may be a cursor or a connection.
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'sql' is the SQL string to execute.
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"""
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try:
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for row in c.execute(sql):
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print(row)
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except sqlite3.Error as e:
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tp = type(e).__name__
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try:
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print(f"{tp} ({e.sqlite_errorname}): {e}", file=sys.stderr)
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except AttributeError:
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print(f"{tp}: {e}", file=sys.stderr)
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if not suppress_errors:
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sys.exit(1)
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class SqliteInteractiveConsole(InteractiveConsole):
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"""A simple SQLite REPL."""
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def __init__(self, connection):
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super().__init__()
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self._con = connection
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self._cur = connection.cursor()
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def runsource(self, source, filename="<input>", symbol="single"):
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"""Override runsource, the core of the InteractiveConsole REPL.
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Return True if more input is needed; buffering is done automatically.
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Return False is input is a complete statement ready for execution.
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"""
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match source:
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case ".version":
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print(f"{sqlite3.sqlite_version}")
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case ".help":
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print("Enter SQL code and press enter.")
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case ".quit":
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sys.exit(0)
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case _:
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if not sqlite3.complete_statement(source):
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return True
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execute(self._cur, source)
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return False
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def main(*args):
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parser = ArgumentParser(
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description="Python sqlite3 CLI",
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)
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parser.add_argument(
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"filename", type=str, default=":memory:", nargs="?",
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help=(
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"SQLite database to open (defaults to ':memory:'). "
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"A new database is created if the file does not previously exist."
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),
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)
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parser.add_argument(
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"sql", type=str, nargs="?",
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help=(
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"An SQL query to execute. "
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"Any returned rows are printed to stdout."
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),
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)
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parser.add_argument(
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"-v", "--version", action="version",
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version=f"SQLite version {sqlite3.sqlite_version}",
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help="Print underlying SQLite library version",
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)
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args = parser.parse_args(*args)
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if args.filename == ":memory:":
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db_name = "a transient in-memory database"
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else:
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db_name = repr(args.filename)
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# Prepare REPL banner and prompts.
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if sys.platform == "win32" and "idlelib.run" not in sys.modules:
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eofkey = "CTRL-Z"
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else:
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eofkey = "CTRL-D"
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banner = dedent(f"""
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sqlite3 shell, running on SQLite version {sqlite3.sqlite_version}
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Connected to {db_name}
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Each command will be run using execute() on the cursor.
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Type ".help" for more information; type ".quit" or {eofkey} to quit.
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""").strip()
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sys.ps1 = "sqlite> "
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sys.ps2 = " ... "
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con = sqlite3.connect(args.filename, isolation_level=None)
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try:
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if args.sql:
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# SQL statement provided on the command-line; execute it directly.
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execute(con, args.sql, suppress_errors=False)
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else:
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# No SQL provided; start the REPL.
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console = SqliteInteractiveConsole(con)
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try:
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import readline # noqa: F401
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except ImportError:
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pass
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console.interact(banner, exitmsg="")
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finally:
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con.close()
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sys.exit(0)
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if __name__ == "__main__":
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main(sys.argv[1:])
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