_mysql_exceptions.IntegrityError: (1062, "Duplicate entry, Python操作MySQL数据库，插入重复数据

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1. sql = "INSERT  INTO test_c(id,name,sex)values(%s,%s,%s)"
2. param = (1,'AJ','MAN')
3. n = cursor.execute(sql,param)
4. db.commit()

当我们使用普通的 “INSERT INTO" 插入数据，如果数据有重复就会有报错：

提示的是键值重复

1. Traceback (most recent call last):
2. File "D:/python/tongbu_py/test.py", line 14, in <module>
3. n = cursor.execute(sql,param)
4. File "D:\Python27\lib\site-packages\MySQLdb\cursors.py", line 174, in execute
5. self.errorhandler(self, exc, value)
6. File "D:\Python27\lib\site-packages\MySQLdb\connections.py", line 36, in defaulterrorhandler
7. raise errorclass, errorvalue
8. _mysql_exceptions.IntegrityError: (1062, "Duplicate entry

INSERT IGNORE会忽略数据库中已经存在的数据，如果数据库没有数据，就插入新的数据，如果有数据的话就跳过这条数据。这样就可以保留数据库中已经存在数据，达到在间隙中插入数据的目的

REPLACE INTO 如果存在primary 或 unique相同的记录，则先删除掉。再插入新记录。

You seem to be inserting constants into the database, not your actual values. Instead, try something similar to;

db_query = cur.execute("INSERT INTO tblS100CurrentListing " +
    "(articleCode, dateReceived, s100RSD, remarks) VALUES (%s, %s, %s, %s)",
    (articleCode, dateReceived, s100rsd, remark_text))

What you want to search for is something called "SQLSTATE" - a set of standard error codes that cover most common RDBMS error states. They don't necessarily provide enough detail for all purposes though, and I don't know if sqlite supports them.

• http://www.postgresql.org/docs/9.1/static/errcodes-appendix.html
• http://dev.mysql.com/doc/refman/5.0/en/error-handling.html