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Any application that will manipulate data contained in a RDBMS must be able to issue Data Manipulation Language (DML). Of course, DML consists of issuing statements such as INSERT, UPDATE, and DELETE. . .the basics of CRUD programming. zxJDBC makes it rather easy to use DML in a standard cursor object. When doing so, the cursor will return a value to provide information about the result. A standard DML transaction in JDBC uses a prepared statement with the cursor object, and assigns the result to a variable that can be read afterwards to determine whether the statement succeeded. ZxJDBC also uses cursors to define new constructs in the database using Data Definition Language (DDL). Examples of doing such are creating tables, altering tables, creating indexes, and the like. Similarly to performing DML with zxJDBC, a resulting DDL statement returns a value to assist in determining whether the statement succeeded or not. In the next couple of examples, we ll create a table, insert some values, delete values, and finally delete the table. Listing 12-19. Using DML # Create a table named PYTHON_IMPLEMENTATIONS >>> stmt = "create table python_implementations (id integer, python_implementation varchar, current_version varchar)" >>> result = cursor.execute(stmt) >>> print result None >>> cursor.tables(None, None, '%', ('TABLE',)) # Ensure table was created >>> cursor.fetchall() [(None, u'public', u'city', u'TABLE', None), (None, u'public', u'country', u'TABLE', None), (None, u'public', u'countrylanguage', u'TABLE', None), (None, u'public', u'python_implementations', u'TABLE', None), (None, u'public', u'test', u'TABLE', None)] # Insert some values into the table >>> stmt = "insert into PYTHON_IMPLEMENTATIONS values ( , , )" >>> result = cursor.executemany(stmt, [1,'Jython','2.5.1']) >>> result = cursor.executemany(stmt, [2,'CPython','3.1.1']) >>> result = cursor.executemany(stmt, [3,'IronPython','2.0.2']) >>> result = cursor.executemany(stmt, [4,'PyPy','1.1']) >>> conn.commit() # Query the database >>> cursor.execute("select python_implementation, current_version from python_implementations") >>> cursor.rowcount vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. 4 >>> cursor.fetchall() [(u'Jython', u'2.5.1'), (u'CPython', u'3.1.1'), (u'IronPython', u'2.0.2'), (u'PyPy', u'1.1')] # Update values and re-query >>> stmt = "update python_implementations set python_implementation = 'CPython -Standard Implementation' where id = 2" >>> result = cursor.execute(stmt) >>> print result None >>> conn.commit() >>> cursor.execute("select python_implementation, current_version from python_implementations") >>> cursor.fetchall() [(u'Jython', u'2.5.1'), (u'IronPython', u'2.0.2'), (u'PyPy', u'1.1'), (u'CPython -Standard Implementation', u'3.1.1')] It is a good practice to make use of bulk inserts and updates. Each time a commit is issued it incurs a performance penalty. If DML statements are grouped together and then followed by a commit, the resulting transaction will perform much better. Another good reason to use bulk DML statements is to ensure transactional safety. It is likely that if one statement in a transaction fails, all others should be rolled back. As mentioned previously in the chapter, using a try/except clause will maintain transactional dependencies. If one statement fails then all others will be rolled back. Likewise, if they all succeed then they will be committed to the database with one final commit. XML documents allow you to create your own vocabularies of elements and attributes to describe data. As XML documents become more complex or draw content from other sources, it s possible that you ll want to use more than one vocabulary in the same document, and that the same element name will appear in both vocabularies with different meanings. For example, say you want to produce a furniture catalog that contains some embedded XHTML information: < xml version="1.0" encoding="UTF-8" > <catalog> <table> <size> <length>2.0</length> <width>0.9</width> vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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