Hazırlanan imleci kullanın ve <code>NULL</code> değerlerini <strong>mysql.connector</strong> eklemeye çalışırken hazırlanan INSERT deyimi

Question

yılında piton mysql.connector Yok (NULL) değerleri kullanmak açılamıyor bir hata bildirir Bunu tam olarak gösteren kod.

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) 

beklenmedik sonuç şudur:

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() 

çıktı böyledir veritabanından

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

Ve eksik satır (31, Hiçbiri).

Answer 1

Son durumda iletilen Yok ile ilgili sorununuzu, Yok'un, tablonuzda tanımlı olan tür olarak yorumlanmamasından kaynaklanabilir.