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1942
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aaronmk
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#!/usr/bin/env python
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# Loads a command's CSV output stream into a PostgreSQL table.
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# The command may be run more than once.
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import csv
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import os.path
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1963
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aaronmk
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import re
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1942
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aaronmk
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import subprocess
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import sys
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sys.path.append(os.path.dirname(__file__)+"/../lib")
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import csvs
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import exc
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import opts
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import sql
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import streams
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1963
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aaronmk
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import strings
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1965
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aaronmk
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import util
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1942
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aaronmk
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def main():
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# Usage
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env_names = []
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def usage_err():
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raise SystemExit('Usage: '+opts.env_usage(env_names)+' '+sys.argv[0]
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+' input_cmd [args...]')
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# Parse args
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input_cmd = sys.argv[1:]
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if input_cmd == []: usage_err()
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# Get config from env vars
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table = opts.get_env_var('table', None, env_names)
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schema = opts.get_env_var('schema', 'public', env_names)
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db_config = opts.get_env_vars(sql.db_config_names, None, env_names)
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debug = opts.env_flag('debug', False, env_names)
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if not (table != None and 'engine' in db_config): usage_err()
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# Connect to DB
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db = sql.connect(db_config)
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1963
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aaronmk
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use_copy_from = [True]
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# Loads data into the table using the currently-selected approach.
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def load_():
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# Open input stream
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proc = subprocess.Popen(input_cmd, stdout=subprocess.PIPE, bufsize=-1)
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in_ = proc.stdout
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# Get format info
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info = csvs.stream_info(in_, parse_header=True)
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dialect = info.dialect
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1963
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aaronmk
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if csvs.is_tsv(dialect): use_copy_from[0] = False
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cols = info.header
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for i, col in enumerate(cols): # replace empty column names
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if col == '': cols[i] = 'column_'+str(i)
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1942
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aaronmk
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1963
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# Select schema and escape names
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1942
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aaronmk
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def esc_name(name): return sql.esc_name(db, name, preserve_case=True)
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1963
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aaronmk
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sql.run_query(db, 'SET search_path TO '+esc_name(schema))
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esc_table = esc_name(table)
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1965
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aaronmk
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esc_cols = map(esc_name, cols)
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1942
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aaronmk
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# Create CREATE TABLE statement
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pkey = esc_name(table+'_pkey')
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1963
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create_table = 'CREATE TABLE '+esc_table+' (\n'
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1965
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create_table += ' row_num serial NOT NULL PRIMARY KEY\n'
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for esc_col in esc_cols: create_table += ' , '+esc_col+' text\n'
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1942
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create_table += ');\n'
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if debug: sys.stderr.write(create_table)
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1963
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# Create table
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sql.run_query(db, create_table)
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1942
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aaronmk
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# Create COPY FROM statement
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1963
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if use_copy_from[0]:
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cur = db.db.cursor()
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copy_from = ('COPY '+esc_table+' ('+(', '.join(esc_cols))
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+') FROM STDIN DELIMITER %(delimiter)s NULL %(null)s')
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assert not csvs.is_tsv(dialect)
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1942
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copy_from += ' CSV'
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if dialect.quoting != csv.QUOTE_NONE:
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copy_from += ' QUOTE %(quotechar)s'
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if dialect.doublequote: copy_from += ' ESCAPE %(quotechar)s'
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1963
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copy_from += ';\n'
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copy_from = cur.mogrify(copy_from, dict(delimiter=dialect.delimiter,
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null=r'\N', quotechar=dialect.quotechar))
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if debug: sys.stderr.write(copy_from)
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# Load the data
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line_in = streams.ProgressInputStream(in_, sys.stderr,
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'Processed %d row(s)', n=10000)
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1963
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try:
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if use_copy_from[0]:
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sys.stderr.write('Using COPY FROM\n')
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db.db.cursor().copy_expert(copy_from, line_in)
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else:
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sys.stderr.write('Using INSERT\n')
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1965
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cols_ct = len(cols)+1 # +1 for row_num
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for row in csvs.make_reader(line_in, dialect):
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row = map(strings.to_unicode, row)
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row.insert(0, sql.default) # leave space for autogen row_num
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1965
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aaronmk
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util.list_set_length(row, cols_ct) # truncate extra cols
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1963
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sql.insert(db, esc_table, row, table_is_esc=True)
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1942
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aaronmk
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finally:
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line_in.close() # also closes proc.stdout
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proc.wait()
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1963
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aaronmk
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load = lambda: sql.with_savepoint(db, load_)
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1942
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aaronmk
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1963
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aaronmk
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try: load()
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except sql.DatabaseErrors, e:
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if use_copy_from[0]: # first try
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exc.print_ex(e, plain=True)
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use_copy_from[0] = False
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load() # try again with different approach
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else: raise e
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db.db.commit()
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1942
|
aaronmk
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main()
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