无法在python mysql.connector的预处理INSERT语句中使用None（NULL）值

Question

当你尝试使用准备好的游标（prepared cursor）并插入 NULL 值时，mysql.connector 报告了一个错误：

mysql.Error: 1210 (HY000): Incorrect arguments to mysqld_stmt_execute

这里有一段代码，正好展示了这个问题。

from __future__ import print_function
import mysql.connector

def execsql(cursor, sqlstmt):
    try:
        cursor.execute(sqlstmt)
    except mysql.connector.Error as e:
        print("mysql.Error: %s" % e)
    print(cursor._executed, '\n')


def execsqlwithparams(cursor, sqlstmt, params):
    try:
        cursor.execute(sqlstmt, params)
    except mysql.connector.Error as e:
        print("mysql.Error: %s" % e)
    print(cursor._executed, "params:", params, '\n')


def main():
    print("mysql.connector.__version__", mysql.connector.__version__)
    db = mysql.connector.connect(db="test")
    print("mysql.db. get server version", db.get_server_version())
    c1 = db.cursor()
    c2 = db.cursor(prepared=False)
    c3 = db.cursor(prepared=True)

    execsql(c1, "drop table if exists test1")
    execsql(c1, "create table test1 (col1 int not null, col2 int null, primary key(col1))")

    print("insert with pure SQL")
    execsql(c1, "insert into test1(col1,col2) values (1, 1)")
    execsql(c1, "insert into test1(col1,col2) values (2, NULL)")

    print("insert with prepared statement format %s")
    sql = "insert into test1(col1,col2) values (%s, %s)"
    execsql(c2, sql)
    execsqlwithparams(c2, sql, (20, 20))
    execsqlwithparams(c2, sql, (21, None))

    print("insert with prepared statement format %s using prepared cursor")
    sql = "insert into test1(col1,col2) values (%s, %s)"
    execsql(c3, sql)
    execsqlwithparams(c3, sql, (30, 30))
    execsqlwithparams(c3, sql, (31, None))

    execsql(c1, "select * from test1")
    row = c1.fetchone()
    while row:
        print(row)
        row = c1.fetchone()
    db.close()


if __name__ == '__main__':
    status = main()

输出结果是这样的：

mysql.connector.__version__ 1.2.2
mysql.db. get server version (5, 5, 37)
drop table if exists test1 

create table test1 (col1 int not null, col2 int null, primary key(col1)) 

insert with pure SQL
insert into test1(col1,col2) values (1, 1) 
insert into test1(col1,col2) values (2, NULL) 

insert with prepared statement format %s
mysql.Error: 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '%s, %s)' at line 1
insert into test1(col1,col2) values (%s, %s) 
insert into test1(col1,col2) values (20, 20) params: (20, 20) 
insert into test1(col1,col2) values (21, NULL) params: (21, None) 

insert with prepared statement format %s using prepared cursor
insert into test1(col1,col2) values (%s, %s) 
insert into test1(col1,col2) values (%s, %s) params: (30, 30) 

mysql.Error: 1210 (HY000): Incorrect arguments to mysqld_stmt_execute
insert into test1(col1,col2) values (%s, %s) params: (31, None)

select * from test1 

(1, 1)
(2, None)
(20, 20)
(21, None)
(30, 30)

意外的结果是这个：

mysql.Error: 1210 (HY000): Incorrect arguments to mysqld_stmt_execute
insert into test1(col1,col2) values (%s, %s) params: (31, None)

而且数据库中缺少了这一行 (31, None)。

mysql error handling database insertion null values cursor management prepared statements

无法在python mysql.connector的预处理INSERT语句中使用None（NULL）值

1 个回答

撰写回答