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idxchk.py
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idxchk.py
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#!/usr/bin/python
'''idxchk.py - pretty print indexes used in a query
Ported to Python by Tom Lynn (tom-fdyvgr@fish.cx).
Requires pysqlite2, sqlite3 (comes with Python 2.5+) or apsw.
Version 1.01 2008-03-07 Fix to list index method name thanks to Michel Lemay.
Added sqlite3 support.
Version 1.0 2006-07-18 Initial version.
Placed in the public domain. I know no Tcl, corrections welcome.
'''
import sys
try:
from pysqlite2 import dbapi2
sqlite_connect, SQLError = dbapi2.connect, dbapi2.OperationalError
except ImportError:
try:
from sqlite3 import dbapi2
sqlite_connect, SQLError = dbapi2.connect, dbapi2.OperationalError
except ImportError:
import apsw
sqlite_connect, SQLError = apsw.Connection, apsw.SQLError
debug = False # if true, displays SQL.
verbose = False
dbname = ''
sql = ''
if '-debug' in sys.argv:
debug = True
sys.argv.remove('-debug')
if '-v' in sys.argv:
verbose = True
sys.argv.remove('-v')
if len(sys.argv) <= 1:
print 'usage: %s [-v] [-debug] dbfile [sqlcmds ...]' % sys.argv[0]
print
print ' -v verbose output: opcodes, databases, tables, cursors'
print ' -debug show the internal SQL queries'
print ' dbfile a valid sqlite3 database file or ":memory:"'
print " sqlcmds one or more sql statements separated by ';'"
print
print 'The last sqlcmd is explained, preceeding ones are executed.'
print 'If sqlcmds is omitted, then read sqlcmds from stdin.'
sys.exit(1)
dbname = sys.argv[1]
# if sql parm is missing, read from stdin
if len(sys.argv) > 2:
sql = ' '.join(sys.argv[2:]) + ' \n;\n'
else:
sql = sys.stdin.read()
# Connect to database.
session = sqlite_connect(dbname)
def DO(sql, params={}, cur=session.cursor()):
'Run some SQL.'
if debug:
print '>>>', '\n...'.join(sql.split('\n'))
if params:
print ' %s' % params
try:
cur.execute(sql, params)
rows = []
for row in cur: # apsw doesn't support cur.fetchall()
rows.append(row)
return rows
except SQLError:
print >>sys.stderr, "BAD SQL:", sql
raise
# find the last sql statement, others are executed first
# eg, if temp tables are created and indexed, attach other db's, etc.
idxsql = ''
while len(idxsql) == 0:
sqlcmds = sql.split(';')
if sqlcmds:
presql = sqlcmds[:-1]
idxsql = sqlcmds[-1].strip()
sql = ';'.join(presql)
else:
print 'no sqlcmds to explain'
session.close()
sys.exit(2)
# execute any pre sql first
cnt = 1
for s in presql:
s = s.strip()
if s:
if verbose:
print 'exec sql %d' % cnt
print '----------------------------------------------------------'
print s.replace('\n', ' ')[:50], '.....'
print
try:
DO(s)
except SQLError as e:
print 'sql error while executing statement %d:' % cnt
print s + '\n\nerror message:\n' + str(e)
session.close()
sys.exit(3)
cnt += 1
try:
vcode = DO('EXPLAIN ' + idxsql)
except SQLError as e:
print 'sql error while explaining statement %d:' % cnt
print idxsql + '\n\nerror message:\n' + str(e)
session.close()
sys.exit(4)
# get database names, in case the presql attached any other dbs or temp tables
if verbose:
print 'dbnum dbname'
print '------ ---------------------------------------------------'
dbarr = {}
for dbnum, dbname, dbfile in DO('pragma database_list'):
dbarr[dbnum] = dbname
if verbose:
print '%6d %s (%s)' % (dbnum, dbname, dbfile)
prevint = -1
idxtbl = {}
nesting = []
cursors = []
# collect cursors on first pass
for addr, opcode, p1, p2, p3 in vcode:
if opcode == 'Integer':
prevint = p1
elif opcode == 'OpenRead':
if prevint == -1: # previous opcode was not Integer!
continue
dbnum = prevint
if dbnum not in dbarr:
# explained statement is probably creating a temp table
dbarr[dbnum] = 'temp'
if dbarr[dbnum] == 'temp':
temp = 'temp_'
else:
temp = ''
if dbarr[dbnum] != 'main' and dbarr[dbnum] != 'temp':
dbname = dbarr[dbnum] + '.'
else:
dbname = ''
if p2 == 1: # opening sqlite_master itself, skip
continue
schemasql = '''SELECT type, name, tbl_name, rootpage
FROM %(dbname)ssqlite_%(temp)smaster
WHERE rootpage = %(p2)s''' % locals()
type, name, tbl_name, rootpage = DO(schemasql)[0]
cursors.append((p1, type, dbname + name, name, tbl_name))
else:
# reset int value, if preceeding opcode not Integer
prevint = -1
if verbose:
print
print 'explain sql'
print '----------------------------------------------------------'
print idxsql
print ''
print 'opcodes'
print '----------------------------------------------------------'
for addr, opcode, p1, p2, p3 in vcode:
print '%s|%s|%s|%s|%s' % (addr, opcode, p1, p2, p3)
print
prevint = -1 # not present in the original Tcl - bug?
for addr, opcode, p1, p2, p3 in vcode:
if opcode == 'Integer':
prevint = p1
elif opcode == 'OpenRead':
if prevint == -1: # previous opcode was not Integer!
continue
dbnum = prevint
if dbnum not in dbarr:
# explained statement is probably creating a temp table
dbarr[dbnum] = 'temp'
if dbarr[dbnum] == 'temp':
temp = 'temp_'
else:
temp = ''
if dbarr[dbnum] != 'main' and dbarr[dbnum] != 'temp':
dbname = dbarr[dbnum] + '.'
else:
dbname = ''
schemasql = '''SELECT type, name, tbl_name, rootpage
FROM %(dbname)ssqlite_%(temp)smaster
WHERE rootpage = %(p2)s''' % locals()
type, name, tbl_name, rootpage = DO(schemasql)[0]
idxtab = dbname + tbl_name
#cursors.append((p1, type, dbnamename))
if type == 'index':
# get info for table, all indexes, and this index
pr_tbl_info = DO('pragma table_info(%s)' % tbl_name)
pr_idx_list = DO('pragma index_list(%s)' % tbl_name)
pr_idx_info = DO('pragma index_info(%s)' % name)
cols = []
pkcollist = []
# sort index column names and assemble index columns
ielems = []
for seq, cid, iname in pr_idx_info:
ielems.append((seq, cid, iname))
for seq, cid, iname in sorted(ielems):
cols.append(iname)
pkcollist.append(iname)
cols = '(%s)' % ','.join(cols)
# if index itself is unique
unique = ''
for iseq, iname, isuniq in pr_idx_list:
if name == iname and isuniq:
unique = ' UNIQUE'
break
cols += unique
# index is primary key if all pkcollist names are in table pk cols
i = -1
# for cid, cname, ctype, ispk in pr_tbl_info: # outdated.
for cid, cname, ctype, notnull, dflt_value, ispk in pr_tbl_info:
try:
ispk = int(ispk)
except ValueError:
continue
if ispk:
try:
i = pkcollist.index(cname)
except ValueError:
# didn't find a pk column in the list of index columns
break
# remove this column name from pkcollist
del pkcollist[i]
if i >= 0 and not pkcollist:
# found all of the table pk columns in the pkcollist
cols += ' PRIMARY KEY'
idxtbl[idxtab] = idxtbl.get(idxtab, [])
idxtbl[idxtab].append((name, cols))
elif type == 'table':
# if not in idxtbl array, add it with empty index info
if idxtab not in idxtbl:
idxtbl[idxtab] = []
if idxtab not in nesting:
nesting.append(idxtab)
elif opcode == 'NotExists' or opcode == 'MoveGe' or opcode == 'MoveLt':
# check for possible primary key usage
for cp1, ctype, ctab, cname, ctbl in cursors:
if p1 == cp1 and ctype == 'table':
idxtbl[ctab].append(('<pk>', '<integer primary key or rowid>'))
break
else:
# reset int value, if preceeding opcode not Integer
prevint = -1
if verbose:
print 'table open order (probable join table nesting)'
print '-----------------------------------------------------------'
lev = 0
for tab in nesting:
print '| ' * lev + tab
lev += 1
if lev > 1:
print '| ' * lev
print
print 'cursor type name'
print '------ ------ ----------------------------------------------'
for cur in cursors:
num, type, fullname, name, tbl = cur
print '%6d %-6.6s %s' % (num, type, fullname)
print
# remove any duplicate indexes per each table
for tbl, idxlist in idxtbl.items():
idxtbl[tbl] = sorted(list(set(idxlist)))
# pretty print in column format
# first, figure out column widths
len1 = 6
len2 = 10
len3 = 10
for tbl, idxlist in idxtbl.items():
if len(tbl) > len1:
len1 = len(tbl)
for idx, idxdef in idxlist:
if len(idx) > len2:
len2 = len(idx)
if len(idxdef) > len3:
len3 = len(idxdef)
fmt = '%-{len1}.{len1}s %-{len2}.{len2}s %-{len3}.{len3}s'
# Substitute in for each "{lenX}" in fmt:
fmt = fmt.replace('%', '%%').replace('{', '%(').replace('}', ')s') % locals()
print fmt % ('table', 'index(es)', 'column(s)')
print fmt % ('-' * len1, '-' * len2, '-' * len3)
# now print in order of table open nesting
for tbl in nesting:
t = tbl
idxlist = idxtbl[tbl]
if not idxlist:
print fmt % (tbl, '(none)', '')
else:
for ientry in idxlist:
idx, idxdef = ientry
print fmt % (tbl, idx, idxdef)
#tbl = ''
try:
del idxtbl[t]
except KeyError:
pass
# print any other indexes where index was opened, but not table
for tbl in idxtbl:
idxlist = idxtbl[tbl]
if not idxlist:
print fmt % (tbl, '(none)', '')
else:
for ientry in idxlist:
idx, idxdef = ientry
print fmt % (tbl, idx, idxdef)
#tbl = ''
print '\nSQLite version:', DO('SELECT sqlite_version()')[0][0]
session.close()