Quick Start
Connect DriverMongoExecutionContext and MongoTemplateResolver, and execute the first query of Reactive Mongo DSL 1.0.0.
1. MongoExecutionContext Configuration
MongoConfig.java
javaMongoClient mongoClient = MongoClients.create(connectionString);
MongoDatabase mongoDatabase = mongoClient.getDatabase("app");
MongoExecutionContext context =
new DriverMongoExecutionContext(mongoClient, mongoDatabase);The default DriverMongoExecutionContext directly uses the MongoDB Reactive Streams Driver. If the collection naming conventions differ, a separate collection-name resolver can be provided.
2. MongoTemplateResolver Connection
MongoTemplateNameResolver.java
javapublic enum MongoTemplateName {
FRONT,
BACK
}
MongoTemplateResolver<MongoTemplateName> resolver = key ->
key == MongoTemplateName.BACK ? backContext : frontContext;
ReactiveMongoDsl<MongoTemplateName> dsl = new ReactiveMongoDsl<>(resolver);What the resolver returns is a MongoExecutionContext.
In version 1.0.0,
MongoTemplateResolver#getTemplate(...) returns a MongoExecutionContext corresponding to the key, not a ReactiveMongoTemplate or Spring transaction object.3. First query
UserService.java
javaFlux<User> users = dsl
.executeEntity(User.class, MongoTemplateName.FRONT)
.fields(
pair("status", "ACTIVE"),
minAge == null ? null : pair("age", minAge, gte)
)
.end()
.findAll()
.sorts(sort -> sort.desc("createdAt"))
.execute();Null dynamic conditions will be skipped in the condition list.
You can pass a
condition ? pair(...) : null form to fields(...). This is unrelated to emitting null in a Reactor publisher.When used as a Spring Bean
ReactiveMongoDslConfiguration.java
java@Configuration
public class ReactiveMongoDslConfiguration {
@Bean
public ReactiveMongoDsl<MongoTemplateName> reactiveMongoDsl(
MongoTemplateResolver<MongoTemplateName> resolver
) {
return new ReactiveMongoDsl<>(resolver);
}
}