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DBMS.py
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DBMS.py
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import sys
import sqlparse
from sql_metadata import Parser
def read_content():
with open(sql_file_path, 'r') as f:
contents = f.read()
statements = sqlparse.split(contents)
n_statements = len(statements)
parsed = sqlparse.parse(contents)
create_statement_count = 0
for i in range(len(statements)):
statement_type = sqlparse.sql.Statement(parsed[i]).get_type()
if(statement_type=='CREATE'):
create_statement_count+=1;
if len(custom_select_query) > 5:
statements[create_statement_count] = custom_select_query
create_statement(statements, create_statement_count)
select_statement(statements, n_statements, create_statement_count)
class create:
def __init__(self, create_statement):
self.statement = sqlparse.format(create_statement, reindent=True, keyword_case='upper')
self.columns_raw = self.parser().columns
self.table_name = self.parser().tables[0]
self.columns = self.columns()
self.column_types = self.column_types()
def parsed(self):
parsed = sqlparse.parse(self.statement)[0]
return parsed
def parser(self):
parser = Parser(self.statement)
return parser
def columns(self):
column_names = self.parser().columns
column_names = [self.table_name + '.' + name for name in column_names]
return column_names
def column_types(self):
column_types = []
type_finder = self.statement.split('(')[1]
type_finder = type_finder.split(',')
for j in self.columns_raw:
for k in type_finder:
if j in k:
column_type = k
break
if 'int' in column_type:
column_types.append('int')
elif 'float' in column_type or 'double' in column_type:
column_types.append('float')
elif 'date' in column_type:
column_types.append('date')
else:
column_types.append('string')
return column_types
def create_statement(statements, create_statement_count):
global column_type_list;
global column_name_list;
global create_dict;
create_dict = {}
column_type_list = []
column_name_list = []
for i in range(create_statement_count):
create_dict[i] = create(statements[i])
column_type_list.append(create_dict[i].column_types)
column_name_list.append(create_dict[i].columns)
column_type_list = [item for sublist in column_type_list for item in sublist]
column_name_list = [item for sublist in column_name_list for item in sublist]
class select:
def __init__(self, select_statement):
self.statement = sqlparse.format(select_statement, reindent=True, keyword_case='upper')
self.columns = self.parser().columns_dict
self.join_column_list = []
self.table_alias = self.parser().tables_aliases
self.where_statement = self.where()
self.table_names = self.parser().tables
self.select_columns = self.select_columns()
self.is_aggregate = False
self.select_function = self.select_function()
self.is_subquery = False
self.select_subquery_list = self.select_subquery()
self.is_join = False
self.join_statement = self.join()
self.column_header = self.column_headers()
self.limit = self.get_limit()
def parsed(self):
parsed = sqlparse.parse(self.statement)[0]
return parsed
def parser(self):
parser = Parser(self.statement)
return parser
def select_columns(self):
columns = self.statement.split('FROM')[0]
if '*' in columns:
columns_list = column_name_list
else:
columns_list = self.columns['select']
columns_list = self.change_column_names(columns_list)
for j in self.table_names:
for k in column_name_list:
if j in k:
self.join_column_list.append(k)
return columns_list
def select_function(self):
functions = ['+', '-', '*', '/', '%', 'SUM', 'MIN', 'MAX', 'AVG', 'COUNT']
columns = self.statement.split('FROM')[0]
columns = columns.replace('SELECT', '').strip()
if any(agg in columns for agg in functions) and len(columns) > 3 and '.*' not in columns:
self.is_aggregate = True
columns = columns.replace('\n', '')
columns = columns.replace(' ', '')
columns_list = columns.split(',')
columns_list = self.change_column_function(columns_list)
return columns_list
def where(self):
where = ';'
num_tokens = len(self.parsed().tokens)
for i in reversed(range(num_tokens)):
if 'WHERE' in str(self.parsed()[i]):
where = str(self.parsed()[i])
break
if len(where)<5:
where="1==1"
return where
if '.' not in where or len(self.table_alias.values()) != len(set(self.table_alias.values())):
for j in column_name_list:
col_name = j.split('.')[1]
if col_name in where and where[where.find(col_name)-1] != '.':
where = where.replace(col_name, j)
where = self.process_condition(where)
return where
def change_column_names(self, columns_list):
for i in range(len(column_name_list)):
for j in range(len(columns_list)):
if columns_list[j] in column_name_list[i]:
columns_list[j] = columns_list[j].replace(columns_list[j], column_name_list[i])
return columns_list
def change_column_function(self, columns_list):
try:
select_alias = self.parser().columns_aliases_dict['select']
is_alias = True
except:
is_alias = False
duplicate=[]
for i in range(len(column_name_list)):
for j in range(len(columns_list)):
flag = 0
if is_alias:
for alias in select_alias:
if alias in columns_list[j]:
columns_list[j] = columns_list[j].replace('AS'+alias, '')
if column_name_list[i].split('.')[1] in columns_list[j]:
if column_name_list[i].split('.')[1]+str(j) in duplicate:
continue
if(columns_list[j].find('(')!=-1):
first_part = columns_list[j][0:columns_list[j].find('(')]
second_part = columns_list[j][columns_list[j].find('('):]
else:
first_part = ''
second_part = columns_list[j]
if '.' in columns_list[j] and 'rec' not in columns_list[j]:
if column_name_list[i] in columns_list[j]:
flag = 1
columns_list[j] = second_part.replace(column_name_list[i], 'rec["'+column_name_list[i]+'"]')
else:
columns_list[j] = second_part.replace(column_name_list[i].split('.')[1], 'rec["'+column_name_list[i]+'"]')
flag = 1
columns_list[j] = first_part + columns_list[j]
if flag == 1:
duplicate.append(column_name_list[i].split('.')[1]+str(j))
if len(self.table_alias) > 0:
for alias in self.table_alias:
columns_list[j] = columns_list[j].replace(alias+'.', '')
return columns_list
def get_limit(self):
limit = self.parser().limit_and_offset
if limit is None:
limit = -1
else:
limit = limit[0]
return limit
def column_headers(self):
columns = self.statement.split('FROM')[0]
columns = columns.replace('SELECT', '').strip()
if '*' in columns and not self.is_aggregate:
header_list = []
for i in self.table_names:
for j in column_name_list:
if i in j:
if len(self.table_names)==1:
header_list.append(j.split('.')[1])
else:
header_list.append(j)
return header_list
else:
columns = columns.split(',')
for i in range(len(columns)):
columns[i] = columns[i].strip()
if 'AS ' in columns[i]:
columns[i] = columns[i].split('AS ')[1].strip()
if len(self.table_names)==1:
if '.' in columns[i]:
columns[i] = columns[i].split('.')[1]
return columns
def select_subquery(self):
subqueries = self.parser().subqueries
select_subquery_result = []
if(len(subqueries)>0):
self.is_subquery = True
for i in select_columns_list:
for j in select_function:
if i in j: select_subquery_result.append(i)
return select_subquery_result
def process_condition(self, condition):
condition = condition.replace('WHERE ', '')
condition = condition.replace('ON ', '')
if len(self.table_alias) > 0:
for i in self.table_alias:
condition = condition.replace(i, self.table_alias[i])
for i in column_name_list:
condition = condition.replace(i, 'rec["'+i+'"]')
condition = condition.replace('=', '==')
condition = condition.replace('\n', '')
condition = condition.replace('AND', 'and')
condition = condition.replace('OR', 'or')
condition = condition.replace(',', 'or')
condition = condition.replace(';', '')
return condition
def join(self):
join = ''
if self.columns is not None and 'join' in self.columns:
self.is_join = True
join = self.statement[self.statement.find('ON'):self.statement.find('WHERE')]
join = join.split('ON')
for i in range(len(join)-1):
join[i] = join[i][:join[i].find('INNER')]
join[i] = join[i][:join[i].find('JOIN')]
join.pop(0)
join = 'AND'.join(str(x) for x in join)
join = self.process_condition(join)
return join
def select_statement(statements, n_statements, create_statement_count):
global select_dict;
select_dict = {}
for i in range(n_statements - create_statement_count):
select_dict[i] = select(statements[create_statement_count + i])
def convert_to_type(record):
for i in range(len(record)):
if column_type_list[i] == 'int':
record[i] = int(record[i])
elif column_type_list[i] == 'float':
record[i] = float(record[i])
else:
record[i] = str(record[i])
return record
def print_aggregate_result(function, array):
if(len(array[0])>0):
for i in range(len(function)):
if 'SUM' in function[i]:
val = sum(array[i])
elif 'AVG' in function[i]:
val = sum(array[i])/len(array[i])
elif 'MIN' in function[i]:
val = min(array[i])
elif 'MAX' in function[i]:
val = max(array[i])
elif 'COUNT' in function[i]:
val = len(array[i])
if i == len(function)-1:
print(val)
else:
print(val, end='|')
def LIMIT(rec):
global limit;
if limit==-1 or is_aggreagate:
PROJECTION(rec)
else:
limit=limit-1
if limit>=0:
PROJECTION(rec)
else:
return True
def AGGREGATION(rec):
for i in range(len(select_function)):
if any(agg in select_function[i] for agg in ['SUM', 'MIN', 'MAX', 'AVG', 'COUNT']):
if '(*)' in select_function[i]:
final_list[i].append(rec)
else:
final_list[i].append(eval(select_function[i][select_function[i].find('('):]))
elif i < len(select_function)-1:
print(eval(select_function[i]), end='|')
else:
print(eval(select_function[i]))
def PROJECTION(record_dict):
rec = dict((k, record_dict[k]) for k in select_columns_list if k in record_dict)
if is_aggreagate == False and is_subquery == False:
result = '|'.join(str(x) for x in list(rec.values()))
print(result)
elif is_aggreagate == False:
rec = dict((k, rec[k]) for k in select_subquery_list if k in rec)
result = '|'.join(str(x) for x in list(rec.values()))
print(result)
else:
AGGREGATION(rec)
def SELECTION(rec, where_condition):
if eval(where_condition):
return True
else:
return False
def JOIN(tables, join_statement):
record=''
for i in range(len(tables)):
record+=table_line[i].rstrip()+'|'
record = record.split('|')
record.pop()
record = convert_to_type(record)
if(len(record) < len(column_name_list)) and not is_join:
rec = dict(zip(join_column_list, record))
else:
rec = dict(zip(column_name_list, record))
if is_join and not eval(join_statement):
return ''
return rec
def READ(tables, where_condition, join_statement, counter=0):
global limit;
with open(dataset_folder_path + tables[counter] + '.dat', 'r') as table_dict[counter]:
for table_line[counter] in table_dict[counter]:
if counter < len(tables)-1:
end = READ(tables, where_condition, join_statement, counter+1)
if end == True:
return True
else:
rec = JOIN(tables, join_statement)
if rec == '':
continue
selection = SELECTION(rec, where_condition)
if selection == True:
end = LIMIT(rec)
if end == True:
return True
def main(dataset_folder_path, sql_file_path):
global table_dict;
global table_line;
global select_function;
global final_list;
global is_aggreagate;
global is_subquery;
global is_join;
global join_column_list;
global select_columns_list;
global select_subquery_list;
global limit;
read_content()
table_dict = {}
table_line = {}
for i in range(len(select_dict)):
column_header = select_dict[i].column_header
print('\n' + '|'.join(column_header))
where_statement = select_dict[i].where_statement
table_names = select_dict[i].table_names
select_columns = select_dict[i].columns
parsed = select_dict[i].parsed()
select_columns_list = select_dict[i].select_columns
is_aggreagate = select_dict[i].is_aggregate
is_subquery = select_dict[i].is_subquery
is_join = select_dict[i].is_join
join_column_list = select_dict[i].join_column_list
limit = select_dict[i].limit
select_subquery_list = select_dict[i].select_subquery
select_function = select_dict[i].select_function
join_statement = select_dict[i].join_statement
final_list = {i: [] for i in range(len(select_function))}
READ(table_names, where_statement, join_statement)
print_aggregate_result(select_function, final_list)
print('')
try:
dataset_folder_path = sys.argv[1]
sql_file_path = sys.argv[2]
custom_select_query = ''
if len(sys.argv)==4:
custom_select_query = sys.argv[3]
main(dataset_folder_path, sql_file_path)
except Exception as e:
print('Exception occured:')
print(e)