The datetime() function is just a more convenient way to do it. The datetime() function returns exactly the same result that strftime('%Y-%m-%d %H:%M:%S'. Result: 23:58:57 datetime() vs strftime() Here’s an example that uses the Julian Day as the time string. If only the time part is supplied, then the date is set to. If you provide just the date part, the time part will be set to all zeros. The above examples use now as the time string, but you can provide any valid time string. Here it is again comparing the original local time with the modified result: SELECTĭatetime('now', '+3 hours', 'localtime') AS "Modified" Therefore, you may get a different result, depending on your local time. It then adjusts the time string so that it displays local time. The reason it does this is because the localtime modifier assumes the time string provided is in Universal Coordinated Time (UTC). In my case, the localtime modifier resulted in the time being moved forward. SELECT datetime('now', '+3 hours', 'localtime') Here’s an example of adding another modifier to the previous example. Multiple ModifiersĪs mentioned, you can add one or more modifiers. Given the original time, this also resulted in the date being moved forward to the next day. In this case, I added three hours to the time. We can modify the previous result by using a modifier. The now time string is converted into the current date and time. Here’s an example to demonstrate the datetime() function being used with one argument. If you provide a modifier, it must be a valid modifier. The timestring argument must be a valid time string. The syntax goes like this: datetime(timestring, modifier, modifier. A modifier allows you to change the date, such as add a number of days, set it to local time, etc Syntax To use this function, you need to provide a time string, plus any (optional) modifiers. It returns the date in this format: YYYY-MM-DD HH:MM:SS To practice what you learned in this article, Solve a Python SQLite Exercise project to practice database operations.The SQLite datetime() function enables you to return a date and time value based on a time string and any modifiers. SqliteConnection = nnect('SQLite_Python.db',Īs you can see when we retrieved the joining date from SQLite table and we got the result in datetime.datetime type. In this example, when we read DateTime from the SQLite table we must get the joining date type as a datetime. It will use the converters dictionary and then use the converter function found there to return the value. If you use this parameter in the connect method, then the SQLite interface parses the column name for each column it returns. It will parse the declared type then use the type converters dictionary to execute the converter function registered for that type there. If you use this parameter in the connect method, then the sqlite3 module parses the declared type for each column it returns. To solve this problem, use detect_types as PARSE_DECLTYPES and PARSE_COLNAMES as arguments in the connect method of the sqlite3 module. We want the DateTime type so we can directly use it. Print("Error while working with SQLite", error)ĪddDeveloper(1, 'Mark', ())Īs we can see, we inserted a date object, but when we retrieved the details from a table, we got a string type. Print("joining date type is", type(joining_Date)) Print(developer, " joined on", joiningDate) Sqlite_select_query = """SELECT name, joiningDate from new_developers where id = ?"""Ĭursor.execute(sqlite_select_query, (1,)) Sqlite_insert_with_param = """INSERT INTO 'new_developers'Ĭursor.execute(sqlite_insert_with_param, data_tuple) Sqlite_create_table_query = '''CREATE TABLE new_developers (Ĭursor.execute(sqlite_create_table_query) SqliteConnection = nnect('SQLite_Python.db') Let’s understand this scenario with a simple example. And when you run a SELECT query from Python to read DateTime values from SQLite table, the sqlite3 module will convert it into a string object. In a usual scenario, when you execute the insert query with the DateTime object, the Python sqlite3 module converts it into a string format instead of an actual DateTime. Python example to insert/Retrieve DateTime from SQLite table Insert data into SQLite Table from Python.If a table is not present in your SQLite database, then please refer to the following articles: – Python example to insert/Retrieve DateTime from SQLite tableīefore executing the following program, please make sure you have an SQLite table with a timestamp as a column from which you want to retrieve/insert data.įor this lesson, I am using the ‘new_developers’ table present in my SQLite database.
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