Python-csvstosqlite将CSV文件转换成SQLite数据库

# csvs-to-sqlite [](https://pypi.python.org/pypi/csvs-to-sqlite) [](https://travis-ci.org/simonw/csvs-to-sqlite) [](https://github.com/simonw/csvs-to-sqlite/blob/master/LICENSE) Convert CSV files into a SQLite database. Browse and publish that SQLite database with [Datasette](https://github.com/simonw/datasette). Basic usage: csvs-to-sqlite myfile.csv mydatabase.db This will create a new SQLite database called `mydatabase.db` containing a single table, `myfile`, containing the CSV content. You can provide multiple CSV files: csvs-to-sqlite one.csv two.csv bundle.db The `bundle.db` database will contain two tables, `one` and `two`. This means you can use wildcards: csvs-to-sqlite ~/Downloads/*.csv my-downloads.db If you pass a path to one or more directories, the script will recursively search those directories for CSV files and create tables for each one. csvs-to-sqlite ~/path/to/directory all-my-csvs.db ## Handling TSV (tab-separated values) You can use the `-s` option to specify a different delimiter. If you want to use a tab character you'll need to apply shell escaping like so: csvs-to-sqlite my-file.tsv my-file.db -s $'\t' ## Refactoring columns into separate lookup tables Let's say you have a CSV file that looks like this: county,precinct,office,district,party,candidate,votes Clark,1,President,,REP,John R. Kasich,5 Clark,2,President,,REP,John R. Kasich,0 Clark,3,President,,REP,John R. Kasich,7 ([Real example taken from the Open Elections project](https://github.com/openelections/openelections-data-sd/blob/master/2016/20160607__sd__primary__clark__precinct.csv)) You can now convert selected columns into separate lookup tables using the new `--extract-`column option (shortname: `-c`) - for example: csvs-to-sqlite openelections-data-*/*.csv \ -c county:County:name \ -c precinct:Precinct:name \ -c office -c district -c party -c candidate \ openelections.db The format is as follows: column_name:optional_table_name:optional_table_value_column_name If you just specify the column name e.g. `-c office`, the following table will be created: CREATE TABLE "office" ( "id" INTEGER PRIMARY KEY, "value" TEXT ); If you specify all three options, e.g. `-c precinct:Precinct:name` the table will look like this: CREATE TABLE "Precinct" ( "id" INTEGER PRIMARY KEY, "name" TEXT ); The original tables will be created like this: CREATE TABLE "ca__primary__san_francisco__precinct" ( "county" INTEGER, "precinct" INTEGER, "office" INTEGER, "district" INTEGER, "party" INTEGER, "candidate" INTEGER, "votes" INTEGER, FOREIGN KEY (county) REFERENCES County(id), FOREIGN KEY (party) REFERENCES party(id), FOREIGN KEY (precinct) REFERENCES Precinct(id), FOREIGN KEY (office) REFERENCES office(id), FOREIGN KEY (candidate) REFERENCES candidate(id) ); They will be populated with IDs that reference the new derived tables. ## Installation $ pip install csvs-to-sqlite `csvs-to-sqlite` now requires Python 3. If you are running Python 2 you can install the last version to support Python 2: $ pip install csvs-to-sqlite==0.9.2 ## csvs-to-sqlite --help Usage: csvs-to-sqlite [OPTIONS] PATHS... DBNAME PATHS: paths to individual .csv files or to directories containing .csvs DBNAME: name of the SQLite database file to create Options: -s, --separator TEXT Field separator in input .csv -q, --quoting INTEGER Control field quoting behavior per csv.QUOTE_* constants. Use one of QUOTE_MINIMAL (0), QUOTE_ALL (1), QUOTE_NONNUMERIC (2) or QUOTE_NONE (3). --skip-errors Skip lines with too many fields instead of stopping the import --replace-tables Replace tables if they already exist -t, --table TEXT Table to use (instead of using CSV filename) -c, --extract-column TEXT One or more columns to 'extract' into a separate lookup table. If you pass a simple column name that column will be replaced with integer foreign key references to a new table of that name. You can customize the name of the table like so: state:States:state_name This will pull unique values from the 'state' column and use them to populate a new 'States' table, with an id column primary key and a state_name column containing the strings from the original column. -d, --date TEXT One or more columns to parse into ISO formatted dates -dt, --datetime TEXT One or more columns to parse into ISO formatted datetimes -df, --datetime-format TEXT One or more custom date format strings to try when parsing dates/datetimes -pk, --primary-key TEXT One or more columns to use as the primary key -f, --fts TEXT One or more columns to use to populate a full- text index -i, --index TEXT Add index on this column (or a compound index with -i col1,col2) --shape TEXT Custom shape for the DB table - format is csvcol:dbcol(TYPE),... --filename-column TEXT Add a column with this name and populate with CSV file name --no-index-fks Skip adding index to foreign key columns created using --extract-column (default is to add them) --no-fulltext-fks Skip adding full-text index on values extracted using --extract-column (default is to add them) --version Show the version and exit. --help Show this message and exit.