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How to combine cin and database in c++

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Release: 2024-04-28 18:45:29
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Cin in C can be combined with the database through a database interface library (such as MySQL Connector/C or ODBC). Specific steps include: installing the database interface library; establishing a database connection; creating a query statement; binding the cin input to the query parameters; executing the query; and obtaining the query results.

How to combine cin and database in c++

The combination of cin and database in C

Use cin in C to read user input from the command line. And database is used to store and manage data. To combine cin with a database, you need to use a database interface library (such as MySQL Connector/C or ODBC).

Using MySQL Connector/C

  1. Install the MySQL Connector/C library.
  2. Include necessary header files in your C code.

    #include <iostream>
    #include <mysqlx/xdevapi.h>
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  3. Establish a database connection.

    mysqlx::Session session("host", "port", "user", "password", "database");
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  4. Create query statement.

    std::string query = "SELECT * FROM table_name WHERE column_name = ?";
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  5. Bind cin input to query parameters.

    mysqlx::PreparedStatement stmt = session.prepare(query);
    std::string input;
    std::cin >> input;
    stmt.bind("column_name", input);
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  6. Execute the query.

    mysqlx::Result res = stmt.execute();
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  7. Get query results.

    for (auto row : res.fetchAll()) {
        std::cout << row[0].get<std::string>() << std::endl;
    }
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Using ODBC

  1. Include the necessary ODBC header files.

    #include <iostream>
    #include <sql.h>
    #include <sqlext.h>
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  2. Establish a database connection.

    SQLHENV henv;
    SQLHDBC hdbc;
    
    SQLAllocEnv(&henv);
    SQLAllocConnect(henv, &hdbc);
    SQLDriverConnect(hdbc, nullptr, "DSN", SQL_NTS, nullptr, 0, nullptr, SQL_DRIVER_NOPROMPT);
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  3. Create a SQL statement handle.

    SQLHSTMT hstmt;
    SQLAllocStmt(hdbc, &hstmt);
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  4. Set SQL statement.

    std::string sql = "SELECT * FROM table_name WHERE column_name = ?";
    SQLBindParameter(hstmt, 1, SQL_PARAM_INPUT, SQL_C_CHAR, SQL_CHAR, 0, 0, nullptr, 0, nullptr);
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  5. Bind cin input to a SQL statement.

    std::string input;
    std::cin >> input;
    SQLSetParam(hstmt, 1, SQL_C_CHAR, input.c_str(), input.length(), nullptr);
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  6. Execute SQL statement.

    SQLExecute(hstmt);
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  7. Get query results.

    SQLBindCol(hstmt, 1, SQL_C_CHAR, nullptr, 0, nullptr);
    
    while (SQLFetch(hstmt) == SQL_SUCCESS) {
        char buffer[1024];
        SQLGetData(hstmt, 1, SQL_C_CHAR, buffer, sizeof(buffer), nullptr);
        std::cout << buffer << std::endl;
    }
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