Question

I have an SQL table with DATETIME field in it. I am using the table from C++. when I fill the row, I need to submit a date time. What is the simplest way to get this?

Using ubuntu and need it to work with Qt also, so better without adding external libraries like boost::.

Answer 1

I was in a similar situation once, so I wrote my own DateTime class.

On pastebin:

DateTime.h

DateTime.cpp

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If you are using MySQL Connector/C++, then I believe this library tries to emulate JDBC from Java. The classes from the java.sql package in Java are defined in the sql namespace in C++.

JDBC has a java.sql.Timestamp class, so the C++ library should have a sql::Timestamp class.

However, the MySQL 5.6 documentation shows that there are feature requests for MySQL Connector/C++ for them to add the Date, Time and Timestamp types from JDBC to the C++ library. So they may not be available yet.

For now, the answers to this question suggest that you should use std::string for fetching and setting Timestamp fields.

Insert:

std::string ts_field = "2012/10/26 07:15:00";

pstmt = con->prepareStatement("INSERT INTO date_table(date_field) VALUES (?)");

pstmt->setString(1, ts_field);
pstmt->execute();

delete pstmt;

Select:

pstmt = con->prepareStatement("SELECT date_field FROM date_table");
res = pstmt->executeQuery();

while (res->next()) 
{
    std::string ts_field = res->getString("date_field");
    cout << ts_field << endl;
}

delete res;
delete pstmt;

If you wanted to manipulate these Timestamps in your program. It would be trivial to use these std::string objects to create DateTime objects using the class that I attached on pastebin.

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If you aren’t too deep into MySQL Connector/C++, you could consider switching to MySQL++. This library definitely has a DateTime type.