How to Connect to a MySQL Database Using C ?

Connecting to Your MySQL Database Using C

To establish a connection to your MySQL database and perform queries, C offers a comprehensive solution. Let's explore how you can achieve this task efficiently.

Required Libraries

Begin by incorporating the necessary libraries into your C project:

• mysql_connection.h: Provides the fundamental connection interface
• cppconn/driver.h: Facilitates interaction with the MySQL driver
• cppconn/exception.h: Enables handling of exceptions that may arise during database operations
• cppconn/resultset.h: Allows for retrieving and iterating over results
• cppconn/statement.h: Enables creating and executing SQL statements

Example Code

The following sample code demonstrates how to establish a connection, execute a query, and retrieve results from a MySQL database:

<code class="c++">#include <stdlib.h>
#include <iostream>

#include "mysql_connection.h"

#include <cppconn/driver.h>
#include <cppconn/exception.h>
#include <cppconn/resultset.h>
#include <cppconn/statement.h>

using namespace std;

int main() {
  try {
    // Create the necessary objects
    sql::Driver *driver;
    sql::Connection *con;
    sql::Statement *stmt;
    sql::ResultSet *res;

    // Establish a connection
    driver = get_driver_instance();
    con = driver->connect("tcp://127.0.0.1:3306", "root", "root");

    // Set the default schema
    con->setSchema("test");

    // Create a statement object
    stmt = con->createStatement();

    // Execute a query
    res = stmt->executeQuery("SELECT 'Hello World!' AS _message"); // Replace with your statement

    // Iterate over the results
    while (res->next()) {
      cout << "\t... MySQL replies: ";
      // Access column data by alias or column name
      cout << res->getString("_message") << endl;
      cout << "\t... MySQL says it again: ";
      // Access column data by numeric offset (1-based)
      cout << res->getString(1) << endl;
    }

    // Clean up resources
    delete res;
    delete stmt;
    delete con;
  } catch (sql::SQLException &e) {
    // Handle exceptions
    cout << "# ERR: SQLException in " << __FILE__ << " (" << __FUNCTION__ << ") on line " << __LINE__ << endl;
    cout << "# ERR: " << e.what() << " (MySQL error code: " << e.getErrorCode() << ", SQLState: " << e.getSQLState() << " )" << endl;
  }

  return EXIT_SUCCESS;
}</code>

Conclusion

By following the steps and incorporating the provided code example, you can successfully connect to your MySQL database from C , execute queries, and retrieve the desired results. This enables you to develop robust and efficient database-driven applications.

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