调用oracle 各种报错总结---待续

• ORA-01747: user.table.column, table.column 或列说明无效 

   原因之一是sql语句拼接错误，多了逗点；二是使用到了oracle的关键字所致 

• ORA-02449: unique/primary keys in table referenced by foreign keys 

查看官方文档：
ORA-02449: unique/primary keys in table referenced by foreign keys

Cause: An attempt was made to drop a table with unique or primary keys referenced by foreign keys in another table.

Action: Before performing the above operations the table, drop the foreign key constraints in other tables. You can see what constraints are referencing a table by issuing the following command: SELECT * FROM USER_CONSTRAINTS WHERE TABLE_NAME = "tabnam";

 

我是在drop表时报的这个错，所以在drop语句后加上 cascade constraints;就执行通过了

 

• Oracle异常ORA-01861:literal does not match format string（字符串格式不匹配）
  • 　问题原因：to_date 或 to_char 需要添加 时间格式，如：yyyy-MM-dd HH24:mi:ss， 否则会提示这个错误，或者本身该字段数据有误，null或空字符串或时间格式不正确（如小时只能在0-24之间，但是小时的值是53时就会报这个错）