--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pydbkit/tools/batchquery.py	Wed Jul 09 18:04:11 2014 +0200
@@ -0,0 +1,73 @@
+from pydbkit.toolbase import SimpleTool
+
+
+class BatchQueryTool(SimpleTool):
+
+    """
+    Run a query using columns from CSV file as arguments.
+    """
+
+    def __init__(self):
+        SimpleTool.__init__(self, name='batchquery')
+
+    def specify_args(self):
+        SimpleTool.specify_args(self)
+        self.parser.add_argument('--query', dest='query', type=str, help='Query to run. Use %%s for arguments, or %%(name)s for named arguments (see --header).')
+        self.parser.add_argument('--file', dest='file', type=str, help='CSV file with data to use as arguments.')
+        self.parser.add_argument('--init', dest='init', type=str, help='Query which initialize database session (eg. temporary function).')
+        self.parser.add_argument('--output', dest='output', type=str, help='File name for results.')
+        self.parser.add_argument('--outputfunc', dest='outputfunc', type=str, help='Python function which will format results (format_row(args, rows)).')
+        self.parser.add_argument('--header', dest='header', action='store_true', help='First line of CSV is header with names for columns. These name can be used in query.')
+
+    def _split_line(self, line):
+        return [x.strip() for x in line.split(',')]
+
+    def main(self):
+        results = []
+        # load query from file
+        with open(self.args.query, 'r', encoding='utf8') as f:
+            query = f.read()
+        # connect DB
+        with self.pgm.cursor('target') as curs:
+            # run init query
+            if self.args.init:
+                with open(self.args.init, 'r', encoding='utf8') as f:
+                    curs.execute(f.read(), [])
+            # read CSV file
+            with open(self.args.file, 'r', encoding='utf8') as f:
+                # read header
+                names = None
+                if self.args.header:
+                    line = f.readline()
+                    names = self._split_line(line)
+                # read and process lines
+                for line in f:
+                    args = self._split_line(line)
+                    if names:
+                        args = dict(zip(names, args))
+                    curs.execute(query, args)
+                    rows = curs.fetchall()
+                    results.append((args, rows))
+            curs.connection.commit()
+        # write results to output file
+        if self.args.output:
+            format_row = None
+            if self.args.outputfunc:
+                with open(self.args.outputfunc, 'r', encoding='utf8') as f:
+                    d = dict()
+                    exec(f.read(), d)
+                    format_row = d['format_row']
+
+            with open(self.args.output, 'w', encoding='utf8') as f:
+                for args, rows in results:
+                    if format_row:
+                        f.write(format_row(args, rows))
+                    else:
+                        f.write(repr(args))
+                        f.write(' -> ')
+                        f.write(repr(rows))
+                    f.write('\n')
+
+
+cls = BatchQueryTool
+