first working version

sql.py

@@ -0,0 +1,159 @@
+#!/usr/bin/python3
+
+import os
+import sys
+import sqlalchemy
+
+
+def softpad(s, l, padchar = " "):
+	padding = padchar * l
+	if len(s) >= l:
+		return s + padchar
+	return (s + padding)[:l]
+def pad(s, l, padchar = " "):
+	padding = padchar * l
+	return (s + padding)[:l]
+
+rowbuffer = None
+def print_row():
+	global rowbuffer, cur, db
+	if not cur or not cur.description:
+		return False
+	try:
+		page = int(opts['page'])
+		colhdrs = [x[0] for x in cur.description]
+		allcols = []
+		lens = []
+		for i in range(len(colhdrs)):
+			l = min(len(colhdrs[i]), 10)
+			lens.append(l)
+		if rowbuffer:
+			rowbuffer = [repr(x) for x in rowbuffer]
+			allcols = [rowbuffer]
+			for i in range(len(rowbuffer)):
+				l = len(rowbuffer[i])
+				if i > len(lens):
+					print(lens)
+					print(rowbuffer)
+				if l > lens[i]:
+					lens[i] = l
+			rowbuffer = None
+		while len(allcols) < page:
+			cols = cur.fetchone()
+			if not cols:
+				break
+			cols = [repr(x) for x in cols]
+			allcols.append(cols)
+			for i in range(len(cols)):
+				l = len(cols[i])
+				if l > lens[i]:
+					lens[i] = l
+		if not allcols:
+			return False
+		for i in range(len(colhdrs)):
+			colhdrs[i] = pad(colhdrs[i], lens[i])
+
+		for i in range(len(allcols)):
+			cols = allcols[i]
+			for j in range(len(cols)):
+				cols[j] = pad(cols[j], lens[j])
+
+		colhdrrow = ' | '.join(colhdrs)
+		seprow = '-' * len(colhdrrow)
+		print(colhdrrow)
+		print(seprow)
+		for cols in allcols:
+			colsrow = ' | '.join(cols)
+			print(colsrow)
+
+		rowbuffer = cur.fetchone()
+		if rowbuffer:
+			print("  ( more )  ")
+		return True
+	except:
+		traceback.print_exc()
+		return False
+
+
+opts = {
+	'page': '20',
+	'hide_null_tablespace': '1',
+	'hide_tablespaces': 'SYSTEM;SYSAUX;SDE;SPATIAL_DATA'
+}
+
+if len(sys.argv) < 2:
+	connstr = input('Connect string: ')
+else:
+	connstr = sys.argv[1]
+
+e = sqlalchemy.create_engine(connstr)
+pool = e.connect()
+db = pool.connection
+cur = db.cursor()
+c2 = db.cursor()
+
+do_quit = False
+while True:
+	try:
+		v = input('# ')
+	except EOFError:
+		do_quit = True
+
+	if do_quit:
+		break
+	v = v.strip()
+	vl = v.lower()
+
+	if vl == 'quit' or vl == 'exit':
+		break
+	elif vl == 'commit':
+		db.commit()
+	elif vl == 'rollback':
+		db.rollback()
+	elif vl == 'tables':
+		rowbuffer = None
+		cur.execute("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES")
+		print_row()
+	elif vl[:5] == 'cols ':
+		rowbuffer = None
+		vs = v.split(' ')
+		c2 = db.cursor()
+		try:
+			c2.execute("select * from %s where 1 is null" % (vs[1],))
+			for coldata in c2.description:
+				print("%s%s" % (softpad(coldata[0], 40), coldata[1]))
+		except:
+			sys.stdout.write(str(sys.exc_info))
+	elif vl[:4] == 'set ':
+		vs = v[4:]
+		vi = vs.find('=')
+		vn = vs[:vi]
+		vv = vs[vi+1:]
+		opts[vn] = vv
+	elif vl == '':
+		print_row()
+	elif vl == 'help':
+		print("""
+commands:
+  tables	   lists tables
+  cols <table> lists columns of table
+  commit	   commits any pending updates or inserts
+  rollback	 aborts and pending updates or inserts
+  help	     displays this help
+  quit	     exits sql.py
+""")
+	else:
+		rowbuffer = None
+		try:
+			v = v.rstrip(';')
+			cur.execute(v)
+			print_row()
+		except:
+			try:
+				c2 = db.cursor()
+				c2.execute("SELECT 1 FROM INFORMATION_SCHEMA.TABLES WHERE 1 IS NULL")
+			except:
+				print("Database connection lost!")
+				sys.exit(1)
+			sys.stdout.write(str(sys.exc_info))
+