如何在 java 代码中使用 MongoTemplate cond 和 filter?
How to use MongoTemplate cond and filter in java code?
如何在springframework_data_mongodb喜欢的图片中使用?
enter image description here
这是 MongoDB 手册中的示例,用于 $filter 聚合转换为 Spring 数据 MongoDB 代码。相同的语法可以应用于关于使用 $filter
以及 条件 .
的问题
MongoOperations mongoOps = new MongoTemplate(MongoClients.create(), "test");
Aggregation agg = newAggregation(
project()
.and(filter("items")
.as("item")
.by(Gte.valueOf("item.price").greaterThanEqualToValue(100)))
.as("items")
);
AggregationResults<Document> results = mongoOps.aggregate(agg, "sales", Document.class);
results.forEach(doc -> System.out.println(doc.toJson()));
参考: org.springframework.data.mongodb.core.aggregation.ArrayOperators.Filter.
如果您使用 Java 8 和 Spring 数据 MongoDB 3.0,这里是针对您的问题的特定代码.3.RELEASE.
import static org.springframework.data.mongodb.core.aggregation.Aggregation.match;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.project;
import static org.springframework.data.mongodb.core.aggregation.ArrayOperators.Filter.filter;
import static org.springframework.data.mongodb.core.query.Criteria.where;
MongoOperations mongoOps = new MongoTemplate(MongoClients.create(), "database");
ProjectionOperation projectionOperation = project().and(filter("fields")
.as("field")
.by(Eq.valueOf("field.code").equalToValue("EngName")))
.as("fields");
MatchOperation matchOperation = match(where("fields.value").in("A","B"));
Aggregation agg = Aggregation.newAggregation(projectionOperation,matchOperation);
AggregationResults<Document> docs = mongoOps.aggregate(agg, "collection", Document.class);
docs.forEach(doc->System.out.println(doc));
如何在springframework_data_mongodb喜欢的图片中使用?
enter image description here
这是 MongoDB 手册中的示例,用于 $filter 聚合转换为 Spring 数据 MongoDB 代码。相同的语法可以应用于关于使用 $filter
以及 条件 .
MongoOperations mongoOps = new MongoTemplate(MongoClients.create(), "test");
Aggregation agg = newAggregation(
project()
.and(filter("items")
.as("item")
.by(Gte.valueOf("item.price").greaterThanEqualToValue(100)))
.as("items")
);
AggregationResults<Document> results = mongoOps.aggregate(agg, "sales", Document.class);
results.forEach(doc -> System.out.println(doc.toJson()));
参考: org.springframework.data.mongodb.core.aggregation.ArrayOperators.Filter.
如果您使用 Java 8 和 Spring 数据 MongoDB 3.0,这里是针对您的问题的特定代码.3.RELEASE.
import static org.springframework.data.mongodb.core.aggregation.Aggregation.match;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.project;
import static org.springframework.data.mongodb.core.aggregation.ArrayOperators.Filter.filter;
import static org.springframework.data.mongodb.core.query.Criteria.where;
MongoOperations mongoOps = new MongoTemplate(MongoClients.create(), "database");
ProjectionOperation projectionOperation = project().and(filter("fields")
.as("field")
.by(Eq.valueOf("field.code").equalToValue("EngName")))
.as("fields");
MatchOperation matchOperation = match(where("fields.value").in("A","B"));
Aggregation agg = Aggregation.newAggregation(projectionOperation,matchOperation);
AggregationResults<Document> docs = mongoOps.aggregate(agg, "collection", Document.class);
docs.forEach(doc->System.out.println(doc));