pymysql python mysql operation

import pymysql
conn = pymysql.connect(host='127.0.0.1', port=3306, user='root', passwd='', db='work')

cursor = conn.cursor () # create a cursor
# Add single
# r = cursor.execute("insert into class(caption)values (%s)",('BTCE1班',))
# Print (r) # print the number of affected
# Print (cursor.lastrowid) # print increment id

# --- batch increase
# l = [("BTEC1班"),("BTEC2班"),("BTEC3班"),("BTEC4班"),]
# r = cursor.executemany("insert into class(caption)values (%s)",l)
# Print (r) # print the number of affected
# new_id = cursor.lastrowid
# Print (new_id) # print increment id
# over_id = new_id +r
# k = [];
#
# # Batch obtained from increasing the id cid;
# while over_id > new_id:
#     k.append(new_id)
#     new_id += 1;
# print(k)
# conn.commit()


# # Change
# # Syntax updata column set on the data sheet provided ==% s where id.
# r = cursor.execute("UPDATE class set caption = %s where cid = 44",('王玉',))
# conn.commit()
# Print (r) # print the number of affected
# Print (cursor.lastrowid) # print increment id

# ----------- additions and deletions, require conn.commit () assigned from people

#check
# r = cursor.execute("select caption from class where cid = 44 or cid = 41 or cid = 40")
# # The default sort order of sql, not sorted by sql query
# print(cursor.fetchone())
# # Cursor.scroll (-1, mode = 'relative') # relative to the current position of the mobile
# # Cursor.scroll (2, mode = 'absolute') # absolute relative position


# Default tuple type
cursor = conn.cursor (cursor = pymysql.cursors.DictCursor) # set to dictionary
cursor.execute("select caption from class where cid = 44 or cid = 41 or cid = 40")
print(cursor.fetchall())
# Again take over, the rest did not
print(cursor.fetchall())
cursor.close()
conn.close()

 

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