Connecting to a mysql server and querying problem

This is a discussion on Connecting to a mysql server and querying problem within the C++ Programming forums, part of the General Programming Boards category; Im using a library to do this. This one: libmySQL.lib This is my code: Code: #include <mysql.h> #include <stdio.h> main() ...

  1. #1
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    Connecting to a mysql server and querying problem

    Im using a library to do this. This one: libmySQL.lib

    This is my code:
    Code:
    #include <mysql.h>
    #include <stdio.h>
    
    main() {
       MYSQL *conn;
       MYSQL_RES *res;
       MYSQL_ROW row;
    
       char *server = "localhost";
       char *user = "root";
       char *password = "";
       char *database = "KKI";
       
       conn = mysql_init(NULL);
       
       /* Connect to database */
       if (!mysql_real_connect(conn, server,
             user, password, database, 0, NULL, 0)) {
          fprintf(stderr, "%s\n", mysql_error(conn));
          exit(0);
       }
    
       /* send SQL query */
       if (mysql_query(conn, "SELECT * FROM KKI_users WHERE ID=1")) {
          fprintf(stderr, "%s\n", mysql_error(conn));
          exit(0);
       }
    
       res = mysql_use_result(conn);
       
       /* output fields 1 and 2 of each row */
       while ((row = mysql_fetch_row(res)) != NULL)
          printf("%s %s\n", row[1], row[2]);
    
       /* Release memory used to store results and close connection */
       mysql_free_result(res);
       mysql_close(conn);
    }
    It should work since it came from a tutorial.

    This is my compiler-log:

    Code:
    Compiler: Default compiler
    Building Makefile: "C:\test3\Makefile.win"
    Bezig met uitvoeren van  make...
    make.exe -f "C:\test3\Makefile.win" all
    gcc.exe -c main.c -o main.o -I"C:/Dev-Cpp/include"   
    
    In file included from C:/Dev-Cpp/include/mysql.h:68,
                     from main.c:1:
    C:/Dev-Cpp/include/mysql_com.h:115: error: syntax error before "SOCKET"
    
    C:/Dev-Cpp/include/mysql_com.h:115: warning: no semicolon at end of struct or union
    
    C:/Dev-Cpp/include/mysql_com.h:130: error: syntax error before '}' token
    C:/Dev-Cpp/include/mysql_com.h:130: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql_com.h:160: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:161: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:162: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:163: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:164: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:165: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:167: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql_com.h:168: error: syntax error before '*' token
    
    In file included from main.c:1:
    C:/Dev-Cpp/include/mysql.h:141: error: syntax error before "NET"
    C:/Dev-Cpp/include/mysql.h:141: warning: no semicolon at end of struct or union
    C:/Dev-Cpp/include/mysql.h:163: error: syntax error before '}' token
    C:/Dev-Cpp/include/mysql.h:163: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:176: error: syntax error before "MYSQL"
    C:/Dev-Cpp/include/mysql.h:176: warning: no semicolon at end of struct or union
    C:/Dev-Cpp/include/mysql.h:178: error: syntax error before '}' token
    C:/Dev-Cpp/include/mysql.h:178: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:183: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:184: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:185: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:186: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:188: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:189: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:190: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:192: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:193: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:194: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:195: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:196: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:197: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:198: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:199: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:201: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:201: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:201: warning: data definition has no type or storage class
    
    C:/Dev-Cpp/include/mysql.h:209: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:209: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:210: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:211: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:214: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:214: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:220: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:229: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:230: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:231: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:232: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:233: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:234: error: syntax error before '*' token
    
    C:/Dev-Cpp/include/mysql.h:236: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:238: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:239: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:240: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:241: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:242: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:244: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:245: error: syntax error before '*' token
    
    C:/Dev-Cpp/include/mysql.h:246: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:247: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:249: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:250: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:251: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:251: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:251: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:252: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:252: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:252: warning: data definition has no type or storage class
    
    C:/Dev-Cpp/include/mysql.h:253: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:253: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:254: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:255: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:255: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:255: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:256: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:256: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:256: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:257: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:257: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:257: warning: data definition has no type or storage class
    C:/Dev-Cpp/include/mysql.h:258: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:260: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:261: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:263: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:264: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:266: error: syntax error before '*' token
    
    C:/Dev-Cpp/include/mysql.h:267: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:268: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:271: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:275: error: syntax error before '*' token
    C:/Dev-Cpp/include/mysql.h:284: error: syntax error before ')' token
    C:/Dev-Cpp/include/mysql.h:285: error: syntax error before '*' token
    main.c: In function `main':
    main.c:5: error: `conn' undeclared (first use in this function)
    main.c:5: error: (Each undeclared identifier is reported only once
    main.c:5: error: for each function it appears in.)
    main.c:6: error: `res' undeclared (first use in this function)
    
    make.exe: *** [main.o] Error 1
    
    Uitvoering voltooid
    I'm using Dev-C++ 4.9.9.2. I have uploaded both mysql.h and mysql_com.h

    I'm a newbie in the C++ language and im just using it to make a dll so i can get an easier access to a mysql server in VB6.
    Attached Files Attached Files

  2. #2
    Mad OnionKnight's Avatar
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    Put a #include <winsock.h> before #include <mysql.h>

  3. #3
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    That seemed to help a bit, but now i get this:

    Code:
    Compiler: Default compiler
    Building Makefile: "C:\test3\Makefile.win"
    Bezig met uitvoeren van  make...
    make.exe -f "C:\test3\Makefile.win" all
    gcc.exe main.o  -o "Project 2.exe" -L"C:/Dev-Cpp/lib" ../Dev-Cpp/lib/mysql++.lib  
    
    main.o(.text+0x4e):main.c: undefined reference to `mysql_init@4'
    main.o(.text+0x93):main.c: undefined reference to `mysql_real_connect@32'
    main.o(.text+0xa5):main.c: undefined reference to `mysql_error@4'
    main.o(.text+0xe3):main.c: undefined reference to `mysql_query@8'
    main.o(.text+0xf5):main.c: undefined reference to `mysql_error@4'
    
    main.o(.text+0x12b):main.c: undefined reference to `mysql_use_result@4'
    main.o(.text+0x13c):main.c: undefined reference to `mysql_fetch_row@4'
    main.o(.text+0x179):main.c: undefined reference to `mysql_free_result@4'
    main.o(.text+0x187):main.c: undefined reference to `mysql_close@4'
    collect2: ld returned 1 exit status
    
    make.exe: *** ["Project] Error 1
    
    Uitvoering voltooid

  4. #4
    Mad OnionKnight's Avatar
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    Seems like you forgot to link libmysql.lib. I haven't used mysql++.lib but I don't think it can stand on it's own feet.

  5. #5
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    Nope, even if i link libmysql it doenst work, not even together

  6. #6
    Mad OnionKnight's Avatar
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    I have no problem compiling it using "bcc32 mysql.c libmysql.lib". I don have Dev-Cpp installed so I can't test it with Mingw

  7. #7
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    Is the bcc compiler for windows and if so where can i get it? (ive looked a little bit around on google but couldnt find it)

  8. #8
    Mad OnionKnight's Avatar
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    bcc32 is the Borland command-line compiler, but I don't think the compiler should matter much.

  9. #9
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    Hmm then why doesnt it work?

    EDIT: Problem solved. I opened up Microsoft Visual C++ and linked to the library, then i build it, with 1 warning (something about main, but nm) and i first got an error about libmySQL.dll, and then i went into the lib folder, got me the libmySQL.dll and copied it into the folder where my project was compiled in. Then it worked flawless

    Thanks for your help mate
    Last edited by Diod; 02-13-2006 at 12:15 PM. Reason: problem solved

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