(mysql.info) mysql-errno

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 22.2.3.14 `mysql_errno()'
 .........................
 
 `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  error-handling.
 
 Note that some functions like `mysql_fetch_row()' don't 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.
 
 *Return Values*
 
 An error code value for the last `mysql_XXX()' call, if it failed. zero
 means no error occurred.
 
 *Errors*
 
 None.
 

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