How to connect mySQL database using C

Question

I m trying to connect the database from my website and display some rows using C    So bascily I m trying to make an application that does a select query from a table from my site database  Now  this must be possible because I ve seen tons of applications doing it   How do I do this  Can some one make an example and tell me what libraries I should be using

User · Answer

Finally I could successfully compile a program with C++ connector in Ubuntu 12.04 I have installed the connector using this command

'apt-get install libmysqlcppconn-dev'

Initially I faced the same problem with "undefined reference to `get_driver_instance' " to solve this I declare my driver instance variable of MySQL_Driver type. For ready reference this type is defined in mysql_driver.h file. Here is the code snippet I used in my program.

sql::mysql::MySQL_Driver *driver;
try {     
    driver = sql::mysql::get_driver_instance();
}

and I compiled the program with -l mysqlcppconn linker option

and don't forget to include this header

#include "mysql_driver.h"

User · Answer

I had to include -lmysqlcppconn to my build in order to get it to work

User · Answer

Found here      Standard C   includes     include  lt stdlib h gt   include  lt iostream gt        Include directly the different   headers from cppconn  and mysql driver h   mysql util h    and mysql connection h   This will reduce your build time      include  mysql connection h    include  lt cppconn driver h gt   include  lt cppconn exception h gt   include  lt cppconn resultset h gt   include  lt cppconn statement h gt   using namespace std   int main void    cout  lt  lt  endl  cout  lt  lt   Running  SELECT  Hello World         AS  message       lt  lt  endl   try     sql  Driver  driver    sql  Connection  con    sql  Statement  stmt    sql  ResultSet  res        Create a connection      driver   get driver instance      con   driver- gt connect  tcp   127 0 0 1 3306    root    root         Connect to the MySQL test database      con- gt setSchema  test       stmt   con- gt createStatement      res   stmt- gt executeQuery  SELECT  Hello World   AS  message       replace with your statement   while  res- gt next          cout  lt  lt    t    MySQL replies            Access column data by alias or column name        cout  lt  lt  res- gt getString   message    lt  lt  endl      cout  lt  lt    t    MySQL says it again            Access column fata by numeric offset  1 is the first column        cout  lt  lt  res- gt getString 1   lt  lt  endl        delete res    delete stmt    delete con     catch  sql  SQLException  amp e      cout  lt  lt     ERR  SQLException in    lt  lt    FILE      cout  lt  lt       lt  lt    FUNCTION    lt  lt     on line            lt  lt    LINE    lt  lt  endl    cout  lt  lt     ERR     lt  lt  e what      cout  lt  lt     MySQL error code     lt  lt  e getErrorCode      cout  lt  lt     SQLState     lt  lt  e getSQLState    lt  lt        lt  lt  endl     cout  lt  lt  endl   return EXIT SUCCESS

User · Answer

Yes  you will need the mysql c   connector library  Read on below  where I explain how to get the example given by mysql developers to work   Note and solution   IDE  I tried using Visual Studio 2010  but just a few sconds ago got this all to work  it seems like I missed it in the manual  but it suggests to use Visual Studio 2008  I downloaded and installed VS2008 Express for c    followed the steps in chapter 5 of manual and errors are gone  It works  I m happy  problem solved  Except for the one on how to get it to work on newer versions of visual studio  You should try the mysql for visual studio addon which maybe will get vs2010 or higher to connect successfully  It can be downloaded from mysql website  Whilst trying to get the example mentioned above to work  I find myself here from difficulties due to changes to the mysql dev website  I apologise for writing this as an answer  since I can t comment yet  and will edit this as I discover what to do and find the solution  so that future developers can be helped  Since this has gotten so big it wouldn t have fitted as a comment anyways  haha     hd1 link to  an example  no longer works  Following the link  one will end up at the page which gives you link to the main manual  The main manual is a good reference  but seems to be quite old and outdated  and difficult for new developers  since we have no experience especially if we missing a certain file  and then what to add    hd1 s link has moved  and can be found with a quick search by removing the url components  keeping just the article name  here it is anyways  http   dev mysql com doc connector-cpp en connector-cpp-examples-complete-example-1 html  Getting 7 5 MySQL Connector C   Complete Example 1 to work  Downloads   -Get the mysql c   connector  even though it is bigger choose the installer package  not the zip   -Get the boost libraries from boost org  since boost is used in connection h and mysql connection h from the mysql c   connector  Now proceed   -Install the connector to your c drive  then go to your mysql server install folder lib and copy all libmysql files  and paste in your connector install folder lib opt  -Extract the boost library to your c drive  Next   It is alright to copy the code as it is from the example linked above  and ofcourse into a new c   project   You will notice errors    -First  change   cout  lt  lt       lt  lt    FUNCTION    lt  lt     on line        lt  lt    LINE    lt  lt  endl    to  cout  lt  lt       lt  lt    FUNCTION    lt  lt     on line    lt  lt    LINE    lt  lt  endl    Not sure what that tiny double arrow is for  but I don t think it is part of c    -Second  Fix other errors of them by reading Chapter 5 of the sql manual  note my paragraph regarding chapter 5 below   Note 1   Chapter 5 Building MySQL Connector C   Windows Applications with Microsoft Visual Studio If you follow this chapter  using latest c   connecter  you will likely see that what is in your connector folder and what is shown in the images are quite different  Whether you look in the mysql server installation include and lib folders or in the mysql c   connector folders  include and lib folders  it will not match perfectly unless they update the manual  or you had a magic download  but for me they don t match with a connector download initiated March 2014    Just follow that chapter 5   -But for c c    General  Additional Include Directories include the  include  folder from the connector you installed  not server install folder  -While doing the above  also include your boost folder see note 2 below  -And for the Linker  General   etc use the opt folder from connector lib opt    Note 2  A second include needs to happen  you need to include from the boost library variant hpp  this is done the same as above  add the main folder you extracted from the boost zip download  not boost or lib or the subfolder  variant  found in boostmainfolder boost   Just the main folder as the second include  Next   What is next I think is the Static Build  well it is what I did anyways  Follow it   Then build compile  LNK errors show up Edit  Gone after changing ide to visual studio 2008   I think it is because I should build connector myself if you do this in visual studio 2010 then link errors should disappear   but been working on trying to get this to work since Thursday  will see if I have the motivation to see this through after a good night sleep and did and now finished

[c++] How to connect mySQL database using C++

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