* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Python sqlite3
Survey
Document related concepts
Commitment ordering wikipedia , lookup
Entity–attribute–value model wikipedia , lookup
Microsoft Access wikipedia , lookup
Serializability wikipedia , lookup
Oracle Database wikipedia , lookup
Functional Database Model wikipedia , lookup
Extensible Storage Engine wikipedia , lookup
Ingres (database) wikipedia , lookup
Microsoft Jet Database Engine wikipedia , lookup
Concurrency control wikipedia , lookup
Microsoft SQL Server wikipedia , lookup
Open Database Connectivity wikipedia , lookup
Versant Object Database wikipedia , lookup
Database model wikipedia , lookup
Clusterpoint wikipedia , lookup
ContactPoint wikipedia , lookup
Transcript
Python sqlite3 sqlite3.connect(database [,timeout ,other optional arguments]) This API opens a connection to the SQLite database file database. You can use ":memory:" to open a database connection to a database that resides in RAM instead of on disk. If database is opened successfully, it returns a connection object. import sqlite3 conn = sqlite3.connect('LOVA.db') connection.execute(sql [, optional parameters]) This routine creates an intermediate cursor object by calling the cursor method, then calls the cursor's execute method with the parameters given. conn.execute('''CREATE TABLE TVRTKA (ID INT PRIMARY KEY NOT NULL, PREZIME TEXT NOT NULL, DOB INT NOT NULL, ADRESA CHAR(50), PRIHOD REAL );''') conn.execute("INSERT INTO TVRTKA ID,PREZIME,DOB,ADRESA,PRIHOD)\ VALUES (1, 'Pajo', 32, 'Istra', 120000.00 )"); cursor = conn.execute("SELECT ID,PREZIME,DOB,ADRESA,PRIHOD from TVRTKA") for row in cursor: print "ID = ", row[0] print "PREZIME = ", row[1] print "DOB = ", row[2] print "ADRESA = ", row[3] print "PRIHOD = ", row[4], "\n" connection.commit() This method commits the current transaction. If you don't call this method, anything you did since the last call to commit() is not visible from other database connections. connection.close() This method closes the database connection. Note that this does not automatically call commit(). If you just close your database connection without calling commit() first, your changes will be lost! conn.commit() conn.close() CURSOR connection.cursor([cursorClass]) This routine creates a cursor which will be used throughout of your database programming with Python. This method accepts a single optional parameter cursorClass. conn = sqlite3.connect('example.db') c = conn.cursor() cursor.execute(sql [, optional parameters]) This routine executes an SQL statement. The SQL statement may be parameterized (i. e. placeholders instead of SQL literals). The sqlite3 module supports two kinds of placeholders: question marks and named placeholders (named style). For example:cursor.execute("insert into people values (?, ?)", (who, age)) cursor.fetchone() This method fetches the next row of a query result set, returning a single sequence, or None when no more data is available t = ('ML1742',) c.execute('SELECT * FROM skladiste WHERE symbol=?', t) print c.fetchone() cursor.fetchmany([size=cursor.arraysize]) This routine fetches the next set of rows of a query result, returning a list. An empty list is returned when no more rows are available. The method tries to fetch as many rows as indicated by the size parameter. cursor.fetchall() This routine fetches all (remaining) rows of a query result, returning a list. An empty list is returned when no rows are available. cursor.executemany(sql, seq_of_parameters) This routine executes an SQL command against all parameter sequences or mappings found in the sequence sql. # Larger example that inserts many records at a time purchases = [('2006-03-28', 'BUY', 'IBM', 1000, 45.00), ('2006-04-05', 'BUY', 'MSFT', 1000, 72.00), ('2006-04-06', 'SELL', 'IBM', 500, 53.00), ] c.executemany('INSERT INTO stocks VALUES (?,?,?,?,?)', purchases) for row in c.execute('SELECT * FROM stocks ORDER BY price'): print row connection.rollback() This method rolls back any changes to the database since the last call to commit(). conn.execute("UPDATE COMPANY set SALARY = 25000.00 where ID=1") conn.commit conn.execute("DELETE from COMPANY where ID=2;") conn.commit connection.total_changes() This routine returns the total number of database rows that have been modified, inserted, or deleted since the database connection was opened. conn.execute("DELETE from COMPANY where ID=2;") conn.commit print "Total number of rows deleted :", conn.total_changes