I have just identified and resolved a recurring problem with this error when using PHP in FreeBSD 5.3.
If you're using mysql_pconnect and you call that function repeatedly, and then execute queries on that connection, you will receive this error message. This may be due to the way persistent connections are handled in FreeBSD.
The workaround is to use mysql_connect, which does not generate this error message.
Posted by
Jon Stephens
on
February 23, 2005
It's best to avoid using mysql_pconnect() in any case, as persistent connections are not supported in PHP 5's mysqli extension (to which all PHP/MySQL development will eventually need to be ported), and really aren't of benefit to Web applications.
Posted by
Peter Sierst Nielsen
on
March 26, 2005
This error just occured coding C using the "mysqlclient include" having multiple instances of the structure:
struct DB { MYSQL mysql; MYSQL_RES *result; MYSQL_FIELD *field; MYSQL_ROW row; unsigned long numRows; unsigned long numFields; };
... and THEN forgetting to call init/connect/select_db on all but one. Just wasted half an hour :| Hope it's going to be of use for the next person. Regards, Peter Sierst Nielsen
Posted by
Vyacheslav Brover
on
September 1, 2009
The problem is avoided if prepared statements with cursors are used:
const unsigned long type = (unsigned long) CURSOR_TYPE_READ_ONLY; mysql_stmt_attr_set (stmt, STMT_ATTR_CURSOR_TYPE, (void*) &type);
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If you're using mysql_pconnect and you call that function repeatedly, and then execute queries on that connection, you will receive this error message. This may be due to the way persistent connections are handled in FreeBSD.
The workaround is to use mysql_connect, which does not generate this error message.
struct DB {
MYSQL mysql;
MYSQL_RES *result;
MYSQL_FIELD *field;
MYSQL_ROW row;
unsigned long numRows;
unsigned long numFields;
};
... and THEN forgetting to call init/connect/select_db on all but one.
Just wasted half an hour :| Hope it's going to be of use for the next person.
Regards, Peter Sierst Nielsen
const unsigned long type = (unsigned long) CURSOR_TYPE_READ_ONLY;
mysql_stmt_attr_set (stmt, STMT_ATTR_CURSOR_TYPE, (void*) &type);