Package org.springframework.r2dbc.core

Interface DatabaseClient

All Superinterfaces:

ConnectionAccessor

public interface DatabaseClient
extends ConnectionAccessor

A non-blocking, reactive client for performing database calls requests with Reactive Streams back pressure. Provides a higher level, common API over R2DBC client libraries.

Use one of the static factory methods create(ConnectionFactory) or obtain a builder() to create an instance. Usage example:

 ConnectionFactory factory = …

 DatabaseClient client = DatabaseClient.create(factory);
 Mono<Actor> actor = client.sql("select first_name, last_name from t_actor")
     .map(row -> new Actor(row.get("first_name", String.class),
          row.get("last_name", String.class)))
     .first();
 

Since:

5.3

Author:

Mark Paluch

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static interface	DatabaseClient.Builder	A mutable builder for creating a DatabaseClient.
static interface	DatabaseClient.GenericExecuteSpec	Contract for specifying an SQL call along with options leading to the execution.

Method Summary

Modifier and Type	Method	Description
static DatabaseClient.Builder	builder()	Obtain a DatabaseClient builder.
static DatabaseClient	create(ConnectionFactory factory)	Create a DatabaseClient that will use the provided ConnectionFactory.
ConnectionFactory	getConnectionFactory()	Return the ConnectionFactory that this client uses.
DatabaseClient.GenericExecuteSpec	sql(String sql)	Specify a static sql statement to run.
DatabaseClient.GenericExecuteSpec	sql(Supplier<String> sqlSupplier)	Specify a SQL supplier that provides SQL to run.

Methods inherited from interface org.springframework.r2dbc.core.ConnectionAccessor

inConnection, inConnectionMany

Method Details

getConnectionFactory

ConnectionFactory getConnectionFactory()

Return the ConnectionFactory that this client uses.

Returns:

the connection factory

sql

DatabaseClient.GenericExecuteSpec sql(String sql)

Specify a static sql statement to run. Contract for specifying a SQL call along with options leading to the execution. The SQL string can contain either native parameter bind markers or named parameters (e.g. :foo, :bar) when NamedParameterExpander is enabled.

Parameters:

sql - the SQL statement

Returns:

a new DatabaseClient.GenericExecuteSpec

See Also:

• NamedParameterExpander
• DatabaseClient.Builder.namedParameters(boolean)

sql

DatabaseClient.GenericExecuteSpec sql(Supplier<String> sqlSupplier)

Specify a SQL supplier that provides SQL to run. Contract for specifying an SQL call along with options leading to the execution. The SQL string can contain either native parameter bind markers or named parameters (e.g. :foo, :bar) when NamedParameterExpander is enabled.

Accepts PreparedOperation as SQL and binding Supplier

Parameters:

sqlSupplier - a supplier for the SQL statement

Returns:

a new DatabaseClient.GenericExecuteSpec

See Also:

• NamedParameterExpander
• DatabaseClient.Builder.namedParameters(boolean)
• PreparedOperation

create

static DatabaseClient create(ConnectionFactory factory)

Create a DatabaseClient that will use the provided ConnectionFactory.

Parameters:

factory - the ConnectionFactory to use for obtaining connections

Returns:

a new DatabaseClient. Guaranteed to be not null.

builder

static DatabaseClient.Builder builder()

Obtain a DatabaseClient builder.