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28.7.7.14 mysql_errno()

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unsigned int mysql_errno(MYSQL *mysql)

Description

For the connection specified by mysql, mysql_errno() returns the error code for the most recently invoked API function that can succeed or fail. A return value of zero means that no error occurred. Client error message numbers are listed in the MySQL errmsg.h header file. Server error message numbers are listed in mysqld_error.h. Errors also are listed at Appendix B, Errors, Error Codes, and Common Problems.

Note

Some functions such as mysql_fetch_row() do not set mysql_errno() if they succeed. A rule of thumb is that all functions that have to ask the server for information reset mysql_errno() if they succeed.

MySQL-specific error numbers returned by mysql_errno() differ from SQLSTATE values returned by mysql_sqlstate(). For example, the mysql client program displays errors using the following format, where 1146 is the mysql_errno() value and '42S02' is the corresponding mysql_sqlstate() value:

  1. shell> SELECT * FROM no_such_table;
  2. ERROR 1146 (42S02): Table 'test.no_such_table' doesn't exist

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Return Values

An error code value for the last mysql_xxx() call, if it failed. zero means no error occurred.

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Errors

None.


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Document created the 26/06/2006, last modified the 26/10/2018
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References

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