aceasfen.blogg.se - Read db text

#Read db text how to#
#Read db text drivers#

Notice that when we execute the query, we're executing it with the cursor as usual. Next, let's create another function, calling it read_from_db: def read_from_db(): Let's see what I mean:Ĭ.execute("CREATE TABLE IF NOT EXISTS stuffToPlot(unix REAL, datestamp TEXT, keyword TEXT, value REAL)")Ĭ.execute("INSERT INTO stuffToPlot VALUES(1452549219,' 13:53:39','Python',6)")ĭate = str((unix).strftime('%Y-%m-%d %H:%M:%S'))Ĭ.execute("INSERT INTO stuffToPlot (unix, datestamp, keyword, value) VALUES (?, ?, ?, ?)", While we can query the entire table, we can instead just query a single column, or even based on specific row values. Reading from a database is where the power of using something like SQLite over a flat file starts to make sense.

#Read db text how to#

DB layer 2.0 migration docs: Information about how to modify your code to work with the new Moodle 2.0 DB layer.In the previous tutorials, we've covered creating a database and populating one, now we need to learn how to read from the database.DB layer 2.0 examples: To see some code examples using various DML functions.DDL functions: Where all the functions used to handle DB objects ( DDL) are defined.DML functions - pre 2.0: (deprecated!) For information valid before Moodle 2.0.

#Read db text drivers#

DML drivers: Database drivers for new DML layer.

DML exceptions: New DML code is throwing exceptions instead of returning false if anything goes wrong.

If you want to get all the current courses in your Moodle, use get_courses() without parameter: Those two course records have probably already been loaded, and using this function will save a database query.Īdditionally, the code is shorter and easier to read. ) if you want to get a course record based on its ID, especially if there is a significant possibility that the course being retrieved is either the current course for the page, or the site course. $DB -> set_debug ( true ) Special cases get_courseįrom Moodle 2.5.1 onwards, you should use the get_course function instead of using get_record('course'. Return a single database record as an object where all the given conditions are met. The function will silently ignore multiple records found and will return just the first one of them.

IGNORE_MULTIPLE - This is not a recommended mode.

If more records are found, a debugging message is displayed.

False boolean is returned if the requested record is not found. IGNORE_MISSING - In this mode, a missing record is not an error.An exception will be thrown if no record is found or multiple matching records are found. MUST_EXIST - In this mode, the requested record must exist and must be unique.Supported modes are specified using the constants: Some methods accept the $strictness parameter affecting the method behaviour. $DB -> get_record_sql ( 'SELECT * FROM WHERE firstname = :firstname AND lastname = :lastname', ) Strictness Example of using question mark placeholders. The DB object is available in the global scope right after including the config.php file:.as a part of including the main config.php file. It is instantiated automatically during the bootstrap setup, i.e. The $DB global object is an instance of the moodle_database class.

Moodle core takes care of setting up the connection to the database according to values specified in the main config.php file.

The data manipulation API is exposed via public methods of the $DB object.

8 Getting field values from multiple records.

7 Getting a particular field value from one record.

5 Counting records that match the given criteria.

4 Getting data as key/value pairs in an associative array.