db-async-common
API
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db-async-common/com.github.mauricio.async.db/Connection

Connection

com.github.mauricio.async.db.Connection
trait Connection

Base interface for all objects that behave like a connection. This trait will usually be implemented by the objects that connect to a database, either over the filesystem or sockets. [[Connection]] are not supposed to be thread-safe and clients should assume implementations are not thread safe and shouldn't try to perform more than one statement (either common or prepared) at the same time. They should wait for the previous statement to be executed to then be able to pick the next one.

You can, for instance, compose on top of the futures returned by this class to execute many statements at the same time:

 val handler: Connection = ...
 val result: Future[QueryResult] = handler.connect
   .map(parameters => handler)
   .flatMap(connection => connection.sendQuery("BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ"))
   .flatMap(query => handler.sendQuery("SELECT 0"))
   .flatMap(query => handler.sendQuery("COMMIT").map(value => query))

 val queryResult: QueryResult = Await.result(result, Duration(5, SECONDS))

Attributes

Graph
Supertypes
class Object
trait Matchable
class Any
Known subtypes
class ConnectionPool[T]

Members list

Value members

Abstract methods

def connect: Future[Connection]

Connects this object to the database. Connection objects are not necessarily created with a connection to the database so you might have to call this method to be able to run queries against it.

Connects this object to the database. Connection objects are not necessarily created with a connection to the database so you might have to call this method to be able to run queries against it.

Attributes

def disconnect: Future[Connection]

Disconnects this object. You should discard this object after calling this method. No more queries will be accepted.

Disconnects this object. You should discard this object after calling this method. No more queries will be accepted.

Attributes

def isConnected: Boolean

Checks whether we are still connected to the database.

Checks whether we are still connected to the database.

Attributes

def sendPreparedStatement(query: String, values: Seq[Any]): Future[QueryResult]

Sends a prepared statement to the database. Prepared statements are special statements that are pre-compiled by the database to run faster, they also allow you to avoid SQL injection attacks by not having to concatenate strings from possibly unsafe sources (like users) and sending them directy to the database.

Sends a prepared statement to the database. Prepared statements are special statements that are pre-compiled by the database to run faster, they also allow you to avoid SQL injection attacks by not having to concatenate strings from possibly unsafe sources (like users) and sending them directy to the database.

When sending a prepared statement, you can insert ? signs in your statement and then provide values at the method call 'values' parameter, as in:

 connection.sendPreparedStatement( "SELECT * FROM users WHERE users.login = ?", Array( "john-doe" ) )

As you are using the ? as the placeholder for the value, you don't have to perform any kind of manipulation to the value, just provide it as is and the database will clean it up. You must provide as many parameters as you have provided placeholders, so, if your query is as "INSERT INTO users (login,email) VALUES (?,?)" you have to provide an array with at least two values, as in:

 Array("john-doe", "[email protected]")

You can still use this method if your statement doesn't take any parameters, the default is an empty collection.

Attributes

def sendQuery(query: String): Future[QueryResult]

Sends a statement to the database. The statement can be anything your database can execute. Not all statements will return a collection of rows, so check the returned object if there are rows available.

Sends a statement to the database. The statement can be anything your database can execute. Not all statements will return a collection of rows, so check the returned object if there are rows available.

Attributes

Concrete methods

def inTransaction[A](f: Connection => Future[A])(implicit executionContext: ExecutionContext): Future[A]

Executes an (asynchronous) function within a transaction block. If the function completes successfully, the transaction is committed, otherwise it is aborted.

Executes an (asynchronous) function within a transaction block. If the function completes successfully, the transaction is committed, otherwise it is aborted.

Value parameters

f

operation to execute on this connection

Attributes

Returns

result of f, conditional on transaction operations succeeding

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