问题：MySQL 5.0不能使用自动增加字段。
具体原因：
引起的原因是在MySQL5.0.2版本中的The Server SQL Mode 中新加了几种 sql_mode,并且在sql的my.ini文件中的sql-mode 默认增加了其中的二种,一个是STRICT_TRANS_TABLES,就是导致auto_increament失败的mode,这个sql_mode主要用于当一个值不能插入到表中是,则产生一个错误而不是一个警告并终止会话。
解决办法:
删除这个sql_mode.重启mysql.
将my.ini中的：
# Set the SQL mode to strict
sql-mode="STRICT_TRANS_TABLES,NO_AUTO_create_USER,NO_ENGINE_SUBSTITUTION"
改为：
# Set the SQL mode to strict
#sql-mode="STRICT_TRANS_TABLES,NO_AUTO_create_USER,NO_ENGINE_SUBSTITUTION"
sql-mode="NO_AUTO_create_USER,NO_ENGINE_SUBSTITUTION"
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