Database Programming in Java

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12 Database Programming
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Table 122 DB-API 20 Cursor Object Attributes and Methods
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Syntax carraysize cclose() cdescription
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Description
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The (readable/writable) number of rows that fetchmany() will return if no size is speci ed
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Closes the cursor, c; this is done automatically when the cursor goes out of scope A read-only sequence of 7-tuples (name, type_code, display_size, internal_size, precision, scale, null_ok), describing each successive column of cursor c Executes the SQL query in string sql, replacing each placeholder with the corresponding parameter from the params sequence or mapping if given Executes the SQL query once for each item in the seq_of_params sequence of sequences or mappings; this method should not be used for operations that create result sets (such as SELECT statements) Returns a sequence of all the rows that have not yet been fetched (which could be all of them) Returns a sequence of rows (each row itself being a sequence); size defaults to carraysize Returns the next row of the query result set as a sequence, or None when the results are exhausted Raises an exception if there is no result set The read-only row count for the last operation (eg, SELECT, INSERT, UPDATE, or DELETE) or -1 if not available or not applicable
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cexecute(sql, params) cexecutemany( sql, seq_of_params) cfetchall() cfetchmany(size) cfetchone()
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umenting our intention, since SQLite, unlike many other databases, does not enforce relational integrity (However, SQLite does have a workaround based on sqlite3 s genfkey command) One other sqlite3-speci c quirk is that its default behavior is to support implicit transactions, so there is no explicit start transaction method
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def add_dvd(db): title = Consoleget_string("Title", "title") if not title: return director = Consoleget_string("Director", "director") if not director: return year = Consoleget_integer("Year", "year", minimum=1896, maximum=datetimedatetoday()year)
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duration = Consoleget_integer("Duration (minutes)", "minutes", minimum=0, maximum=60*48) director_id = get_and_set_director(db, director) cursor = dbcursor() cursorexecute("INSERT INTO dvds " "(title, year, duration, director_id) " "VALUES ( , , , )", (title, year, duration, director_id)) dbcommit()
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This function starts with the same code as the equivalent function from the dvds-dbmpy program, but once we have gathered the data, it is quite different The director the user entered may or may not be in the directors table, so we have a get_and_set_director() function that inserts the director if they are not already in the database, and in either case returns the director s ID ready for it to be inserted into the dvds table With all the data available we execute an SQL INSERT statement We don t need to specify a record ID since SQLite will automatically provide one for us In the query we have used question marks for placeholders Each is replaced by the corresponding value in the sequence that follows the string containing the SQL statement Named placeholders can also be used as we will see when we look at editing a record Although it is possible to avoid using placeholders and simply format the SQL string with the data embedded into it, we recommend always using placeholders and leaving the burden of correctly encoding and escaping the data items to the database module Another bene t of using placeholders is that they improve security since they prevent arbitrary SQL from being maliciously injected into a query
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def get_and_set_director(db, director): director_id = get_director_id(db, director) if director_id is not None: return director_id cursor = dbcursor() cursorexecute("INSERT INTO directors (name) VALUES ( )", (director,)) dbcommit() return get_director_id(db, director)
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This function returns the ID of the given director, inserting a new director record if necessary If a record is inserted we retrieve its ID using the get_director_id() function we tried in the rst place
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def get_director_id(db, director): cursor = dbcursor() cursorexecute("SELECT id FROM directors WHERE name= ", (director,))
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12 Database Programming
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fields = cursorfetchone() return fields[0] if fields is not None else None
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The get_director_id() function returns the ID of the given director or None if there is no such director in the database We use the fetchone() method because there is either zero or one matching record (We know that there are no duplicate directors because the directors table s name eld has a UNIQUE constraint, and in any case we always check for the existence of a director before adding a new one) The fetch methods always return a sequence of elds (or None if there are no more records), even if, as here, we have asked to retrieve only a single eld
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def edit_dvd(db): title, identity = find_dvd(db, "edit") if title is None: return title = Consoleget_string("Title", "title", title) if not title: return cursor = dbcursor() cursorexecute("SELECT dvdsyear, dvdsduration, directorsname " "FROM dvds, directors " "WHERE dvdsdirector_id = directorsid AND " "dvdsid=:id", dict(id=identity)) year, duration, director = cursorfetchone() director = Consoleget_string("Director", "director", director) if not director: return year = Consoleget_integer("Year", "year", year, 1896, datetimedatetoday()year) duration = Consoleget_integer("Duration (minutes)", "minutes", duration, minimum=0, maximum=60*48) director_id = get_and_set_director(db, director) cursorexecute("UPDATE dvds SET title=:title, year=:year, " "duration=:duration, director_id=:director_id " "WHERE id=:identity", locals()) dbcommit()
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To edit a DVD record we must rst nd the record the user wants to work on If a record is found we begin by giving the user the opportunity to change the title Then we retrieve the other elds so that we can provide the existing values as defaults to minimize what the user must type since they can just press Enter to accept a default Here we have used named placeholders (of the form :name), and must therefore provide the corresponding values using a mapping For the SELECT statement we have used a freshly created dictionary, and for the UPDATE statement we have used the dictionary returned by locals()