def DisplayJoin():
env = SliceEnv()
left_name = input("Input the first database's name(For example:CustDB): ")
right_name = input("Input the second database's name(For example:SalesDB): ")
leftDB = env.open(left_name)
rightDB = env.open(right_name)
rightDB.join(leftDB)
env.close(left_name)
env.close(right_name)
print('Join OK!')
def DisplayJoin():
env = SliceEnv()
left_name = input("Input the first database's name(For example:CustDB): ")
right_name = input(
"Input the second database's name(For example:SalesDB): ")
leftDB = env.open(left_name)
rightDB = env.open(right_name)
rightDB.join(leftDB)
env.close(left_name)
env.close(right_name)
print('Join OK!')
def RunQuery():
query = input("Input a Query: ")
select_index = query.find('SELECT')
from_index = query.find('FROM')
where_index = query.find('WHERE')
if select_index == -1 or from_index == -1 or where_index == -1:
return 'Input Wrong!'
display_list = query[select_index + 6:from_index - 1].strip().split(',')
target_database = query[from_index + 5:where_index - 1].strip()
condition = query[where_index + 5:]
less_index = condition.find('(')
greater_index = condition.find(')')
if less_index == -1 and greater_index == -1:
condition_list = [
item.strip() for item in condition.strip().split(',')
]
else:
new_condition = condition[:less_index] + condition[
less_index + 1:greater_index] + condition[greater_index + 1:]
condition_list = [
item.strip() for item in new_condition.strip().split(',')
]
col_name, operator, literal = condition_list[0], condition_list[
1], condition_list[2]
col_list = [item for item in display_list]
col_list.append(col_name)
env = SliceEnv()
sliceDB = env.open(target_database)
result = sliceDB.run_query(col_list, col_name, operator, literal)
for item in result:
item_str = ''
for each in item:
item_str += str(each) + ' '
print(item_str)
def RunQuery():
query = input("Input a Query: ")
select_index = query.find('SELECT')
from_index = query.find('FROM')
where_index = query.find('WHERE')
if select_index==-1 or from_index==-1 or where_index==-1:
return 'Input Wrong!'
display_list = query[select_index+6:from_index-1].strip().split(',')
target_database = query[from_index+5:where_index-1].strip()
condition = query[where_index+5:]
less_index = condition.find('(')
greater_index = condition.find(')')
if less_index==-1 and greater_index==-1:
condition_list = [item.strip() for item in condition.strip().split(',')]
else:
new_condition = condition[:less_index]+condition[less_index+1:greater_index]+condition[greater_index+1:]
condition_list = [item.strip() for item in new_condition.strip().split(',')]
col_name,operator,literal = condition_list[0],condition_list[1],condition_list[2]
col_list = [item for item in display_list]
col_list.append(col_name)
env = SliceEnv()
sliceDB = env.open(target_database)
result = sliceDB.run_query(col_list,col_name,operator,literal)
for item in result:
item_str = ''
for each in item:
item_str += str(each)+' '
print(item_str)
def DeleteRecord():
env = SliceEnv()
db_name = input("Input the table's name(For example:CustDB): ")
sliceDB = env.open(db_name)
index_col = sliceDB.db_index_col
key_value = input("The key of the table "+db_name+" is "+index_col+", input the key value: ")
value_list = sliceDB.delete(key_value)
print(value_list)
env.close(db_name)
def DeleteRecord():
env = SliceEnv()
db_name = input("Input the table's name(For example:CustDB): ")
sliceDB = env.open(db_name)
index_col = sliceDB.db_index_col
key_value = input("The key of the table " + db_name + " is " + index_col +
", input the key value: ")
value_list = sliceDB.delete(key_value)
print(value_list)
env.close(db_name)
def UpdateRecord():
env = SliceEnv()
db_name = input("Input the table's name(For example:CustDB): ")
sliceDB = env.open(db_name)
sliceRecord = sliceDB.createRecord()
fields = []
for item in sliceDB.db_schema:
fields.append(item.get_field_name())
for field in fields:
value = input('Input "' + field + '" value:')
# print(value)
if value:
sliceRecord.setString(field, value)
sliceDB.set(sliceRecord)
env.close(db_name)
print('Update OK')
def AddRecord():
env = SliceEnv()
db_name = input("Input the database's name(For example:CustDB):")
sliceDB = env.open(db_name)
sliceRecord = sliceDB.createRecord()
while 1:
field = input('Input the field name(For example:cust),Press Enter to quit input: ')
if field:
value = input("Input the value: ")
sliceRecord.setString(field,value)
else:
break
sliceDB.set(sliceRecord)
env.close(db_name)
print('Add OK')
def AddRecord():
env = SliceEnv()
db_name = input("Input the database's name(For example:CustDB):")
sliceDB = env.open(db_name)
sliceRecord = sliceDB.createRecord()
while 1:
field = input(
'Input the field name(For example:cust),Press Enter to quit input: '
)
if field:
value = input("Input the value: ")
sliceRecord.setString(field, value)
else:
break
sliceDB.set(sliceRecord)
env.close(db_name)
print('Add OK')
def Bulkload():
env = SliceEnv()
db_name = input("Input the database's name(For example:CustDB): ")
sliceDB = env.open(db_name)
bulkfile = input("Input the bulk file's name(For example:CustDB): ")
sliceDB.load(bulkfile)