MySQL 5.4 Reference Manual :: 20 Connectors and APIs :: 20.9 MySQL C API :: 20.9.9 C API Embedded Server Function Descriptions :: 20.9.9.1 mysql_server_init()
Section Navigation [Toggle]
- 20.9.9 C API Embedded Server Function Descriptions
- 20.9.9.1 mysql_server_init()
- 20.9.9.2 mysql_server_end()
int mysql_server_init(int argc, char **argv, char
**groups)
Description
This function initializes the MySQL library, which must be done
before you call any other MySQL function. However,
mysql_server_init() is
deprecated and you should call
mysql_library_init() instead.
See Section 20.9.3.40, “mysql_library_init()”.
Return Values
Zero if successful. Nonzero if an error occurred.
User Comments
I don't know how often this might come up for others, but here's a tip for those times you have to specify a path for the data directory (or other args) in server_args at runtime.
mysql_server_init apparently does not copy the strings you supply it. It simply makes use of the pointers. Be sure that any string variables you put in place of the server arguments persist throughout your program or some functions may fail. Here's an example:
char Data[] = "--datadir=c:/blah/blah/blah/";
const char *server_args[] =
{
"this_program",
Data,
"--skip-innodb"
};
mysql_server_init(etc...);
Now the function ends and the 'Data' var is obliterated. mysql_server_init will execute correctly, but later, in a different function mysql_real_connect will fail mysteriously, claiming it can't find the specified database.
Seems simple, even obvious. I won't mention how long it took me to trace the problem in my program...
It seems that beetwen the version 4.0.24 and 4.1.10 the errmsg.sys format have changed, so if you got some troubles try to use the latest errmsg.sys file !
If your program crashes while mysql_server_init() on Windows,
don't forget to create a directory "data" in the directory in which your .exe is placed. I'tryed about one week for to solve the problem.
Add your own comment.