Open a database, creating it if it doesn't exist, and return a Database object.
name (string) -- Name of the database file to open.
The version, description and size arguments are ignored, but are accepted by the function for compatibility with the WebSQL specification.
Returns a Database object, described below.
Database objects are returned by calls to Expo.SQLite.openDatabase(). Such an object represents a connection to a database on your device. They support one method:
db.transaction(callback, error, success)
Execute a database transaction.
callback (function) -- A function representing the transaction to perform. Takes a Transaction (see below) as its only parameter, on which it can add SQL statements to execute.
error (function) -- Called if an error occured processing this transaction. Takes a single parameter describing the error.
success (function) -- Called when the transaction has completed executing on the database.
A Transaction object is passed in as a parameter to the callback parameter for the db.transaction() method on a Database (see above). It allows enqueuing SQL statements to perform in a database transaction. It supports one method:
Enqueue a SQL statement to execute in the transaction. Authors are strongly recommended to make use of the ? placeholder feature of the method to avoid against SQL injection attacks, and to never construct SQL statements on the fly.
sqlStatement (string) -- A string containing a database query to execute expressed as SQL. The string may contain ? placeholders, with values to be substituted listed in the arguments parameter.
arguments (array) -- An array of values (numbers or strings) to substitute for ? placeholders in the SQL statement.
success (function) -- Called when the query is successfully completed during the transaction. Takes two parameters: the transaction itself, and a ResultSet object (see below) with the results of the query.
error (function) -- Called if an error occured executing this particular query in the transaction. Takes two parameters: the transaction itself, and the error object.
ResultSet objects are returned through second parameter of the success callback for the tx.executeSql() method on a Transaction (see above). They have the following form: