Websql for Instant Messaging

There are several ways to websql storage:

OpenDatabase: This method uses an existing database or creates a new database to create a database object.

Transaction: This method allows us to perform transaction processing;

ExecuteSQL: This method is used to execute SQL statements;

1 var db = OpenDatabase (name,version,displayname,estimatesize,creationcallback);

Name: Names of databases;

Version: The revision number of the database;

DisplayName: Description of the database;

Estimatesize: The size of the database to hold data;

Createcallback: callback function:

2 calling transaction to execute SQL statements

Transaction (function (TX) {})

TX: The parameter received by the callback function, which is a reference to the transaction object.

3 Calling the ExecuteSQL method to represent processing transactions

Transaction.executesql (Sql,[],datahandler,errorhandler);

SQL: The SQL statement to execute;

[placeholder in]:sql statement]? "the corresponding parameter.

DataHandler: The callback function invoked when the Execute SQL statement succeeds:

ErrorHandler: The callback function that is called when the Execute SQL statement fails.

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 Websql for Instant Messaging