Extracted SQL state class '42' from value '42000'
时间: 2023-08-04 11:05:16 浏览: 69
这个提示表明 SQL 执行出现了错误,SQL 状态码为 '42000',属于 '42' 类。SQL 状态码是用来标识 SQL 执行过程中出现的错误类型的,不同的状态码代表不同类型的错误。在这种情况下,建议你查看错误堆栈信息,了解具体的错误原因和位置,并根据错误提示进行修复。如果无法解决问题,可以考虑咨询专业人员或查阅相关文档进行进一步的排查。
相关问题
java提示Extracted SQL state class '42' from value '42000'
这个提示是 Java 中 JDBC 抛出的异常信息,表明执行 SQL 语句时出现了错误。其中,'42000' 是 SQL 的状态码,'42' 是 SQL 状态码的类别。SQL 状态码是用来标识 SQL 执行过程中出现的错误类型的,不同的状态码代表不同类型的错误。在这种情况下,你可以查看具体的异常信息,了解错误的原因和位置,并根据错误提示进行修复。如果无法解决问题,可以考虑咨询专业人员或查阅相关文档进行进一步的排查。
SQL substr
SUBSTR is a SQL function that is used to extract a substring from a string. It takes three parameters: the input string, the starting position, and the length of the substring.
The syntax for using SUBSTR in SQL is as follows:
```sql
SUBSTR(input_string, starting_position, length)
```
Here's an example to demonstrate how it works:
```sql
SELECT SUBSTR('Hello World', 7, 5) AS result;
```
In this example, the starting position is 7 and the length is 5. So, the substring 'World' will be extracted from the input string 'Hello World'. The result of this query will be 'World'.
You can also use negative values for the starting position parameter to count positions from the end of the string. For example:
```sql
SELECT SUBSTR('Hello World', -5, 5) AS result;
```
In this case, the substring 'World' will still be extracted because the negative starting position of -5 counts from the end of the string.
I hope this helps! Let me know if you have any more questions.