io.vertx.rxjava3.pgclient

## Class PgConnection

- java.lang.Object
- - io.vertx.rxjava3.sqlclient.SqlClient
  - - io.vertx.rxjava3.sqlclient.SqlConnection
    - - io.vertx.rxjava3.pgclient.PgConnection

-     public class PgConnection
      extends SqlConnection

  A connection to Postgres.

  The connection object supports all the operations defined in the interface, it also provides additional support:

  - Notification
  - Request Cancellation

  NOTE: This class has been automatically generated from the `original` non RX-ified interface using Vert.x codegen.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static io.vertx.lang.rx.TypeArg<PgConnection>` | `__TYPE_ARG`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `PgConnection(Object delegate)`
    `PgConnection(PgConnection delegate)`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `PgConnection` | `cancelRequest(Handler<AsyncResult<Void>> handler)` Send a request cancellation message to tell the server to cancel processing request in this connection.
    `static PgConnection` | `cast(SqlConnection sqlConnection)` Cast a to `PgConnection`.
    `PgConnection` | `closeHandler(Handler<Void> handler)` Set an handler called when the connection is closed.
    `static Single<PgConnection>` | `connect(Vertx vertx)` Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from the environment variables.
    `static Single<PgConnection>` | `connect(Vertx vertx, PgConnectOptions options)` Connects to the database and returns the connection if that succeeds.
    `static Single<PgConnection>` | `connect(Vertx vertx, String connectionUri)` Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from `connectionUri`.
    `boolean` | `equals(Object o)`
    `PgConnection` | `exceptionHandler(Handler<Throwable> handler)` Set an handler called with connection errors.
    `PgConnection` | `getDelegate()`
    `int` | `hashCode()`
    `static PgConnection` | `newInstance(PgConnection arg)`
    `PgConnection` | `notificationHandler(Handler<PgNotification> handler)` Set an handler called when the connection receives notification on a channel.
    `Single<PreparedStatement>` | `prepare(String sql)` Create a prepared statement using the given `sql` string.
    `int` | `processId()`
    `static Single<PgConnection>` | `rxConnect(Vertx vertx)` Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from the environment variables.
    `static Single<PgConnection>` | `rxConnect(Vertx vertx, PgConnectOptions options)` Connects to the database and returns the connection if that succeeds.
    `static Single<PgConnection>` | `rxConnect(Vertx vertx, String connectionUri)` Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from `connectionUri`.
    `Single<PreparedStatement>` | `rxPrepare(String sql)` Create a prepared statement using the given `sql` string.
    `int` | `secretKey()`
    `String` | `toString()`

    - ### Methods inherited from class io.vertx.rxjava3.sqlclient.SqlConnection

      `begin, close, databaseMetadata, isSSL, newInstance, prepare, rxBegin, rxClose, rxPrepare`

    - ### Methods inherited from class io.vertx.rxjava3.sqlclient.SqlClient

      `newInstance, preparedQuery, preparedQuery, query`

    - ### Methods inherited from class java.lang.Object

      `clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### __TYPE_ARG

          public static final io.vertx.lang.rx.TypeArg<PgConnection> __TYPE_ARG

  - ### Constructor Detail

    - #### PgConnection

          public PgConnection(PgConnection delegate)

    - #### PgConnection

          public PgConnection(Object delegate)

  - ### Method Detail

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `SqlConnection`

    - #### equals

          public boolean equals(Object o)

      Overrides:
        `equals` in class `SqlConnection`

    - #### hashCode

          public int hashCode()

      Overrides:
        `hashCode` in class `SqlConnection`

    - #### getDelegate

          public PgConnection getDelegate()

      Overrides:
        `getDelegate` in class `SqlConnection`

    - #### connect

          public static Single<PgConnection> connect(Vertx vertx,
                                                     PgConnectOptions options)

      Connects to the database and returns the connection if that succeeds.

      The connection interracts directly with the database is not a proxy, so closing the connection will close the underlying connection to the database.
      Parameters:
        `vertx` - the vertx instance
        `options` - the connect options
      Returns:

    - #### rxConnect

          public static Single<PgConnection> rxConnect(Vertx vertx,
                                                       PgConnectOptions options)

      Connects to the database and returns the connection if that succeeds.

      The connection interracts directly with the database is not a proxy, so closing the connection will close the underlying connection to the database.
      Parameters:
        `vertx` - the vertx instance
        `options` - the connect options
      Returns:

    - #### connect

          public static Single<PgConnection> connect(Vertx vertx)

      Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from the environment variables.
      Parameters:
        `vertx` -
      Returns:

    - #### rxConnect

          public static Single<PgConnection> rxConnect(Vertx vertx)

      Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from the environment variables.
      Parameters:
        `vertx` -
      Returns:

    - #### connect

          public static Single<PgConnection> connect(Vertx vertx,
                                                     String connectionUri)

      Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from `connectionUri`.
      Parameters:
        `vertx` -
        `connectionUri` -
      Returns:

    - #### rxConnect

          public static Single<PgConnection> rxConnect(Vertx vertx,
                                                       String connectionUri)

      Like `connect(io.vertx.rxjava3.core.Vertx, io.vertx.pgclient.PgConnectOptions)` with options build from `connectionUri`.
      Parameters:
        `vertx` -
        `connectionUri` -
      Returns:

    - #### notificationHandler

          public PgConnection notificationHandler(Handler<PgNotification> handler)

      Set an handler called when the connection receives notification on a channel.

      The handler is called with the `PgNotification` and has access to the channel name and the notification payload.
      Parameters:
        `handler` - the handler
      Returns:
        the transaction instance

    - #### cancelRequest

          public PgConnection cancelRequest(Handler<AsyncResult<Void>> handler)

      Send a request cancellation message to tell the server to cancel processing request in this connection.
      Note: Use this with caution because the cancellation signal may or may not have any effect.
      Parameters:
        `handler` - the handler notified if cancelling request is sent
      Returns:
        a reference to this, so the API can be used fluently

    - #### processId

          public int processId()

      Returns:
        The process ID of the target backend

    - #### secretKey

          public int secretKey()

      Returns:
        The secret key for the target backend

    - #### prepare

          public Single<PreparedStatement> prepare(String sql)

      Description copied from class: `SqlConnection`
      Create a prepared statement using the given `sql` string.
      Overrides:
        `prepare` in class `SqlConnection`
      Parameters:
        `sql` -
      Returns:

    - #### rxPrepare

          public Single<PreparedStatement> rxPrepare(String sql)

      Description copied from class: `SqlConnection`
      Create a prepared statement using the given `sql` string.
      Overrides:
        `rxPrepare` in class `SqlConnection`
      Parameters:
        `sql` -
      Returns:

    - #### exceptionHandler

          public PgConnection exceptionHandler(Handler<Throwable> handler)

      Description copied from class: `SqlConnection`
      Set an handler called with connection errors.
      Overrides:
        `exceptionHandler` in class `SqlConnection`
      Parameters:
        `handler` -
      Returns:

    - #### closeHandler

          public PgConnection closeHandler(Handler<Void> handler)

      Description copied from class: `SqlConnection`
      Set an handler called when the connection is closed.
      Overrides:
        `closeHandler` in class `SqlConnection`
      Parameters:
        `handler` -
      Returns:

    - #### cast

          public static PgConnection cast(SqlConnection sqlConnection)

      Cast a to `PgConnection`. This is mostly useful for Vert.x generated APIs like RxJava/Mutiny.
      Parameters:
        `sqlConnection` - the connection to cast
      Returns:
        a `instance`

    - #### newInstance

          public static PgConnection newInstance(PgConnection arg)

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