How to Connect to a MySQL Database from Your C Application?

How to Connect MySQL Database Using C

Connecting to a MySQL database from a C application allows you to perform database operations, such as executing SQL queries. Here's a guide on how to do it:

Prerequisites:

• Install the MySQL Connector/C libraries.

Steps:

1. Include Necessary Headers:

   <code class="cpp">#include <cppconn/driver.h>
   #include <cppconn/exception.h>
   #include <cppconn/resultset.h>
   #include <cppconn/statement.h></code>

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2. Create a Connection:

   <code class="cpp">sql::Driver *driver = get_driver_instance();
   sql::Connection *con = driver->connect("tcp://127.0.0.1:3306", "root", "root");</code>

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3. Set the Database:

   <code class="cpp">con->setSchema("your_database_name");</code>

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4. Create a Statement and Query:

   <code class="cpp">sql::Statement *stmt = con->createStatement();
   sql::ResultSet *res = stmt->executeQuery("your_sql_query");</code>

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5. Iterate Over Results:

   <code class="cpp">while (res->next()) {
     cout << res->getString("column_name") << endl;
   }

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Here's an example that demonstrates how to execute a simple "Hello World!" query:

<code class="cpp">int main() {
  sql::Connection *con;
  sql::Statement *stmt;
  sql::ResultSet *res;

  try {
    con = get_driver_instance()->connect(
        "tcp://127.0.0.1:3306", "user", "password");
    con->setSchema("test");

    stmt = con->createStatement();
    res = stmt->executeQuery("SELECT 'Hello World!' AS _message");

    while (res->next()) {
      cout << "MySQL replies: " << res->getString("_message") << endl;
    }
  } catch (sql::SQLException &amp;e) {
    cout << "MySQL error code: " << e.getErrorCode() << endl;
  }

  return 0;
}</code>

By following these steps, you can connect to a MySQL database and execute SQL queries using C .

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