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The following image justifies the difference between collapse and separate. The separate value of the border-collapse property separates the borders of the cells:ExampleYou can try to run the following code to understand the difference between border-collapse separate and collapse value: table.one { border-collapse:collapse; } table.two { border-collapse:separate; } td.a { border-style:dotted; border-width:2px; border-color:#000000; padding: 20px; } td.b { border-style:solid; border-width:2px; border-color:#333333; padding:20px; } Border Collapse India Australia Border Separate India Australia
When you send a text message using Python, then all the content are treated as simple text. Even if you include HTML tags in a text message, it is displayed as simple text and HTML tags will not be formatted according to HTML syntax. But Python provides option to send an HTML message as actual HTML message.While sending an e-mail message, you can specify a Mime version, content type and character set to send an HTML e-mail.ExampleFollowing is the example to send HTML content as an e-mail. Try it once −#!/usr/bin/python import smtplib message = """From: From Person To: ... Read More
There are many sources of errors. A few examples are a syntax error in an executed SQL statement, a connection failure, or calling the fetch method for an already canceled or finished statement handle.The DB API defines a number of errors that must exist in each database module. The following table lists these exceptions.Sr.No.Exception & Description1WarningUsed for non-fatal issues. Must subclass StandardError.2ErrorBase class for errors. Must subclass StandardError.3InterfaceErrorUsed for errors in the database module, not the database itself. Must subclass Error.4DatabaseErrorUsed for errors in the database. Must subclass Error.5DataErrorSubclass of DatabaseError that refers to errors in the data.6OperationalErrorSubclass of DatabaseError ... Read More
The border-spacing specifies the width between table cells. It can take either one or two values; these should be units of length.ExampleYou can try to run the following code to set the width of table cells: table.one { border-collapse:separate; width:300px; border-spacing:15px 40px; } The border-spacing property India UK
To disconnect Database connection, use close() method.db.close()If the connection to a database is closed by the user with the close() method, any outstanding transactions are rolled back by the DB. However, instead of depending on any of DB lower level implementation details, your application would be better off calling commit or rollback explicitly.
COMMITCommit is the operation, which gives a green signal to database to finalize the changes, and after this operation, no change can be reverted back.Here is a simple example to call commit method.db.commit()ROLLBACKIf you are not satisfied with one or more of the changes and you want to revert back those changes completely, then use rollback() method.Here is a simple example to call rollback() method.db.rollback()
Transactions are a mechanism that ensures data consistency. Transactions have the following four properties −Atomicity − Either a transaction completes or nothing happens at all.Consistency − A transaction must start in a consistent state and leave the system in a consistent state.Isolation − Intermediate results of a transaction are not visible outside the current transaction.Durability − Once a transaction was committed, the effects are persistent, even after a system failure.The Python DB API 2.0 provides two methods to either commit or rollback a transaction.ExampleYou already know how to implement transactions. Here is again similar example −# Prepare SQL query to DELETE required records sql ... Read More
The caption-side property allows you to specify where the content of a element should be placed in relationship to the table.ExampleThis property can have one of the four values top, bottom, left or right. Let us seen an example to learn how to implement caption-side property: caption.top { caption-side:top } caption.bottom { caption-side:bottom } Countries (Top Caption) India UK US Australia Countries (Bottom caption) India UK US Australia
DELETE operation is required when you want to delete some records from your database. Following is the procedure to delete all the records from EMPLOYEE where AGE is more than 20 −Example#!/usr/bin/python import MySQLdb # Open database connection db = MySQLdb.connect("localhost", "testuser", "test123", "TESTDB" ) # prepare a cursor object using cursor() method cursor = db.cursor() # Prepare SQL query to DELETE required records sql = "DELETE FROM EMPLOYEE WHERE AGE > '%d'" % (20) try: # Execute the SQL command cursor.execute(sql) # Commit your changes in the database db.commit() except: # Rollback in case ... Read More
The empty-cells property specifies whether the border should be shown if a cell is empty. It indicates whether a cell without any content should have a border displayed.ExampleThis property can have one of the three values show, hide or inherit. table.empty{ width:400px; border-collapse:separate; empty-cells:hide; } td.empty{ padding:5px; border-style:solid; border-width:1px; border-color:#999999; } Title one Title two Row Title R1T1 R1T2 Row Title R2T1