python操作数据库获取结果之fetchone和fetchall的区别说明

import cx_Oracle
conn = cx_Oracle.connect("用户名/密码@数据库地址")
cur = conn.cursor()
sql_3 = "select id from CZEPT_BSDT t WHERE name='{}'".format("基本支出调剂")
cur.execute(sql_3)
result_3 = cur.fetchone() # 单条数据结果集
print(result_3)  # (1,)
print(type(result_3)) # <class 'tuple'>
result_3= result_3[0] 
print(result_3)  # 1
print(type(result_3)) # <class 'int'>
print("*" * 50)
sql_2 = "select * from CZEPT_BSDT "  
cur.execute(sql_2)
result_2 = cur.fetchall()  # 多条数据结果集
print(result_2)  # [(1,'基本支出调剂'),(3,'银行账户审批'),(5,'项目支出调剂')]
print(type(result_2))  # <class 'list'>
result_2= result_2[0][0]
print(result_2)   # 1
print(type(result_2))  # <class 'int'>

import cx_Oracle
connection = cx_Oracle.connect('用户名/密码@数据库地址')
cur = connection.cursor()
for j in data_list:
    sql = "select guid from jczl.division where name='{}'".format(j['DIVISIONNAME'])
    cur.execute(sql)
    result = cur.fetchone()
    # 因为存在归口处室为空，所以切片的时候总是报超出索引范围，搞了好久
    if result is not None:
        j['DIVISIONGUID'] = str(result[0])