"unable to include mysql.h" in C program [duplicate] - mysql

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Closed 11 years ago.
Possible Duplicate:
How to make #include <mysql.h> work?
I need to connect C and mysql
This is my program
#include <stdio.h>
#include <mysql.h>
#define host "localhost"
#define username "root"
#define password "viswa"
#define database "dbase"
MYSQL *conn;
int main()
{
MYSQL_RES *res_set;
MYSQL_ROW row;
conn = mysql_init(NULL);
if( conn == NULL )
{ `
printf("Failed to initate MySQL\n");
return 1;
}
if( ! mysql_real_connect(conn,host,username,password,database,0,NULL,0) )
{
printf( "Error connecting to database: %s\n", mysql_error(conn));
return 1;
}
unsigned int i;
mysql_query(conn,"SELECT name, email, password FROM users");
res_set = mysql_store_result(conn);
unsigned int numrows = mysql_num_rows(res_set);
unsigned int num_fields = mysql_num_fields(res_set);
while ((row = mysql_fetch_row(res_set)) != NULL)
{
for(i = 0; i < num_fields; i++)
{
printf("%s\t", row[i] ? row[i] : "NULL");
}
printf("\n");
}
mysql_close(conn);
return 0;
}
I got the error "unable to include mysql.h".
I am using windows 7, Turbo C, mysql and I downloaded mysql-connector-c-noinstall-6.0.2-win32-vs2005, but I don't know how to include it.

Answer 1

Wrong syntax. The #include is a C preprocessor directive, not a statement (so should not end with a semi-colon). You should use
#include <mysql.h>
and you may need instead to have
#include <mysql/mysql.h>
or to pass -I /some/dir options to your compiler (with /some/dir replaced by the directory containing the mysql.h header).
Likewise, your #define should very probably not be ended with a semi-colon, you may need
#define username "root"
#define password "viswa"
#define database "dbase"
I strongly suggest reading a good book on C programming. You may want to examine the preprocessed form of your source code; when using gcc you could invoke it as gcc -C -E
yoursource.c to get the preprocessed form.
I also strongly recommend enabling warnings and debugging info (e.g. gcc -Wall -g for GCC). Find out how your specific compiler should be used. Learn also how to use your debugger (e.g. gdb). Study also existing C programs (notably free software).
You should learn how to configure your compiler to use extra include directories, and to link extra libraries.
N.B. With a linux distribution, you'll just have to install the appropriate packages and perhaps use mysql_config inside our Makefile (of course you'll need appropriate compiler and linker flags), perhaps with lines like
CFLAGS += -g -Wall $(shell mysql_config --cflags)
LIBES += $(shell mysql_config --libs)
added to your Makefile.