sqlite-utils rows -c, closes #200

docs/cli.rst

@@ -198,6 +198,12 @@ You can return every row in a specified table using the ``rows`` command::
 
 This command accepts the same output options as ``query`` - so you can pass ``--nl``, ``--csv``, ``--tsv``, ``--no-headers``, ``--table`` and ``--fmt``.
 
+You can use the ``-c`` option to specify a subset of columns to return::
+
+    $ sqlite-utils rows dogs.db dogs -c age -c name
+    [{"age": 4, "name": "Cleo"},
+     {"age": 2, "name": "Pancakes"}]
+
 .. _cli_tables:
 
 Listing tables

sqlite_utils/cli.py

@@ -1061,6 +1061,7 @@ def search(
     required=True,
 )
 @click.argument("dbtable")
+@click.option("-c", "--column", type=str, multiple=True, help="Columns to return")
 @output_options
 @load_extension_option
 @click.pass_context
@@ -1068,6 +1069,7 @@ def rows(
     ctx,
     path,
     dbtable,
+    column,
     nl,
     arrays,
     csv,
@@ -1079,10 +1081,13 @@ def rows(
     load_extension,
 ):
     "Output all rows in the specified table"
+    columns = "*"
+    if column:
+        columns = ", ".join("[{}]".format(c) for c in column)
     ctx.invoke(
         query,
         path=path,
-        sql="select * from [{}]".format(dbtable),
+        sql="select {} from [{}]".format(columns, dbtable),
         nl=nl,
         arrays=arrays,
         csv=csv,

tests/test_cli.py

@@ -1039,6 +1039,10 @@ def test_query_memory_does_not_create_file(tmpdir):
         ),
         (["--arrays"], '[[1, "Cleo", 4],\n [2, "Pancakes", 2]]'),
         (["--arrays", "--nl"], '[1, "Cleo", 4]\n[2, "Pancakes", 2]'),
+        (
+            ["--nl", "-c", "age", "-c", "name"],
+            '{"age": 4, "name": "Cleo"}\n{"age": 2, "name": "Pancakes"}',
+        ),
     ],
 )
 def test_rows(db_path, args, expected):