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- Java mongoTemplate
应用 mongoTemplate 表白 mongo shell 表达式。 - 应用 spring boot 集成 mongo，而后间接跑 test 实操
蕴含，$group,$project 等操作
package com.example.springboot;
import lombok.Builder;
import lombok.Getter;
import lombok.Setter;
import lombok.ToString;
import org.aspectj.lang.annotation.Before;
import org.assertj.core.util.Lists;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.annotation.Id;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.BulkOperations;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.*;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.data.mongodb.core.query.UpdateDefinition;
import org.springframework.data.util.Pair;
import org.springframework.util.StringUtils;
import javax.swing.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import static org.springframework.data.mongodb.core.aggregation.Aggregation.newAggregationOptions;
/**
* @see com.example.springboot.SpringbootApplicationTests#testProject()
*/
@SpringBootTest
class SpringbootApplicationTests {
@Autowired
private MongoTemplate mongoTemplate;
@Test
void contextLoads() {}
/**
* 初始化 student 数据
*/
@Test
public void setupData(){Student student = Student.builder()
.id("1").name("张三").age(15).chinese(90).maths(95).physics(93).chemistry(100).biology(99).english(98).build();
Student student1 = Student.builder()
.id("2").name("李四").age(18).chinese(80).maths(90).physics(93).chemistry(88).biology(93).english(83).build();
Student student2 = Student.builder()
.id("3").name("王五").age(16).chinese(72).maths(80).physics(84).chemistry(77).biology(79).english(72).build();
Student student3 = Student.builder()
.id("4").name("王小二").age(20).chinese(72).maths(80).physics(84).chemistry(77).biology(79).english(72).build();
Student student4 = Student.builder()
.id("5").name("jim").age(20).chinese(72).maths(80).physics(84).chemistry(77).biology(79).english(79).build();
List<Student> students = Lists.newArrayList(student,student1, student2,student3, student4);
BulkOperations bulkOperations =
mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, Student.COLLECTION);
bulkOperations.insert(students);
bulkOperations.execute();}
/**
* 初始化书籍数据
*/
@Test
public void setupBooksData(){Book apue = Book.builder().id("1").title("apue").author("stevens").type("computer").copies(8).build();
Book mysqlInAction = Book.builder().id("2").title("mysql in action").author("lee").type("computer").copies(10).build();
Book redisInAction = Book.builder().id("3").title("redis in action").author("lee").type("computer").copies(5).build();
Book englishABC = Book.builder().id("4").title("english A B C").author("li lei").type("english").copies(15).build();
Book toefl = Book.builder().id("5").title("toefl").author("li lei").type("english").copies(10).build();
Book chinese = Book.builder().id("6").title("chinese A B C").author("zhang san").type("chinese").copies(12).build();
List<Book> students = Lists.newArrayList(apue, mysqlInAction, redisInAction, englishABC, toefl, chinese);
BulkOperations bulkOperations =
mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, Book.COLLECTION);
bulkOperations.insert(students);
bulkOperations.execute();}
@Test
public void insertOneStudent(){Student student3 = Student.builder()
.id("7").name("jeff").age(19).chinese(73).maths(80).physics(84).chemistry(77).biology(79).english(72).build();
mongoTemplate.insert(student3);
}
/**
* 数据中没有则保留，有这更新
*/
@Test
public void saveOneStudent(){Student student3 = Student.builder()
.id("7").name("jeff").age(100).chinese(73).maths(80).physics(84).chemistry(77).biology(79).english(72).build();
mongoTemplate.save(student3);
}
@Test
public void batchSave(){// 见数据初始化处}
/**
* update 批量更新，*/
@Test
public void testBatchUpdate(){List<Pair<Query, Update>> updates = new ArrayList<>();
for (int i = 0; i < 5; i ++){Query query = new Query();
Criteria criteria = new Criteria().and("_id").is(i+ "");
query.addCriteria(criteria);
Update update = Update.update("age", i);
updates.add(Pair.of(query, update));
}
BulkOperations bulkOperations =
mongoTemplate.bulkOps(BulkOperations.BulkMode.UNORDERED, "student");
bulkOperations.updateMulti(updates);
bulkOperations.execute();}
/**
* 将查问进去的后果对立批改。* mongoTemplate.upsert 办法，如果不存在，则新建一条记录。存在则更新，十分有用。*/
@Test
public void testUpdate(){Query query = new Query();
Criteria criteria = new Criteria().and("age").is(18);
query.addCriteria(criteria);
UpdateDefinition update = Update.update("english", 99);
mongoTemplate.updateMulti(query, update, "student");
}
/**
* find $in
*/
@Test
public void testFindByIn(){Query query = new Query();
Criteria criteria = new Criteria().and("age").in(18,19,20);
query.addCriteria(criteria);
// query.withHint("age"); // 举荐 mongo 应用索引
query.skip(1);
query.limit(10);
query.with(Sort.by(Sort.Direction.DESC, "age"));
String qString = query.getQueryObject().toString();
System.out.println(qString);
List<Student> students = mongoTemplate.find(query, Student.class);
System.out.println(students);
}
/**
* 正则
* db.student.find({name : /Jim/i}); 都是疏忽大小写的
* db.student.find({name : {$regex: "Jim", $options: "$i"}});
*/
@Test
public void testFindByRegex(){
String regexStr = "^JI";
// Criteria criteria = new Criteria().and("name").regex(regexStr, "I"); // I 疏忽大小写
Pattern pattern = Pattern.compile(regexStr, Pattern.CASE_INSENSITIVE);
Criteria criteria = new Criteria().and("name").regex(pattern);
Query query = Query.query(criteria);
List<Student> students = mongoTemplate.find(query, Student.class);
System.out.println(students);
}
/**
* group author.
* "pipeline" : [{"$match" : {}}, {"$group" : { "_id" : "$author", "copiesTotal" : { "$sum" : "$copies"}, "copiesMax" : {"$max" : "$copies"}, "avg" : {"$avg" : "$copies"}}}]
*/
@Test
public void TestGroup() {List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
// todo 减少过滤条件
operations.add(Aggregation.match(criteria));
GroupOperation groupOperation = new GroupOperation(Fields.fields("author")).
sum("copies").as("copiesTotal").
max("copies").as("copiesMax").
avg("copies").as("avg");
operations.add(groupOperation);
Aggregation aggregation = Aggregation.newAggregation(operations)
.withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Map> aggregationResults =
mongoTemplate.aggregate(aggregation, "book", Map.class);
System.out.println(aggregationResults.getMappedResults());
}
/**
* $group 字段为 null 时，去所有 $match 匹配的文档都为一个分组。* $push 将字段退出某个数组，所有 group 的分组中的字段都退出
* $addToSet 和 push 相比会去重
*
* "pipeline" : [{"$match" : {}}, {"$group" : { "_id" : null, "authurs" : { "$push" : "$author"}}}, {"$project" : { "_id" : 0}}]
* "pipeline" : [{"$match" : {}}, {"$group" : { "_id" : null, "authors" : { "$push" : "$author"}, "uniqueAuthors" : {"$addToSet" : "$author"}}}, {"$project" : { "_id" : 0}}]
*/
@Test
public void testPush(){List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
operations.add(Aggregation.match(criteria));
GroupOperation groupOperation = Aggregation.group().
push("author").as("authors")
.addToSet("author").as("uniqueAuthors");
operations.add(groupOperation);
ProjectionOperation projectionOperation = Aggregation.project().andExclude("_id");
operations.add(projectionOperation);
Aggregation aggregation = Aggregation.newAggregation(operations)
.withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Map> aggregationResults =
mongoTemplate.aggregate(aggregation, "book", Map.class);
System.out.println(aggregationResults.getMappedResults());
}
/**
* $unwind 根据某个字段数组拆分成独自的文档。* "pipeline" : [{"$match" : {}}, {"$group" : { "_id" : null, "authors" : { "$push" : "$author"}, "uniqueAuthors" : {"$addToSet" : "$author"}}}, {"$project" : { "_id" : 0}}, {"$unwind" : "$authors"}]
*/
@Test
public void testUnwind(){List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
operations.add(Aggregation.match(criteria));
GroupOperation groupOperation = Aggregation.group().
push("author").as("authors")
.addToSet("author").as("uniqueAuthors");
operations.add(groupOperation);
ProjectionOperation projectionOperation = Aggregation.project().andExclude("_id");
operations.add(projectionOperation);
operations.add(Aggregation.unwind("authors"));
Aggregation aggregation = Aggregation.newAggregation(operations)
.withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Map> aggregationResults =
mongoTemplate.aggregate(aggregation, "book", Map.class);
System.out.println(aggregationResults.getMappedResults());
}
/**
* project 解决 english 和 maths 之和，并不输入 id 字段。* "pipeline" : [{"$match" : {}}, {"$project" : { "ts" : { "$add" : ["$english", "$maths"]}, "_id" : 0}}]
*/
@Test
public void testProject(){List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
operations.add(Aggregation.match(criteria));
ProjectionOperation projectionOperation = new ProjectionOperation();
Fields fields = Fields.fields("student");
projectionOperation.andInclude(fields);
projectionOperation = Aggregation.project().and("english").plus("maths").as("ts").andExclude("_id");
operations.add(projectionOperation);
Aggregation aggregation = Aggregation.newAggregation(operations)
.withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Map> aggregationResults =
mongoTemplate.aggregate(aggregation, "student", Map.class);
System.out.println(aggregationResults.getMappedResults());
}
/**
* project 输入指定字段，排除其余字段
* "pipeline" : [{"$match" : {}}, {"$project" : { "name" : 1, "english" : 1, "maths" : 1, "chinese" : 1, "_id" : 0}}]
*/
@Test
public void testProjectField(){List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
operations.add(Aggregation.match(criteria));
ProjectionOperation projectionOperation = new ProjectionOperation();
Fields fields = Fields.fields("name", "english", "maths", "chinese");
projectionOperation = projectionOperation.andInclude(fields).andExclude("_id"); // Aggregation.project(fields).andExclude("_id");
operations.add(projectionOperation);
Aggregation aggregation = Aggregation.newAggregation(operations)
.withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Map> aggregationResults =
mongoTemplate.aggregate(aggregation, "student", Map.class);
System.out.println(aggregationResults.getMappedResults());
}
/**
* 统计学生几门课的总分。* 存在问题，如果一个学生的某个课程分数为 null，或者活没有该字段，则统计的 total 为 null.
* "pipeline" : [{"$match" : {}}, {"$project" : { "total" : { "$add" : ["$english", "$maths", "$chinese"]}}}]
*/
@Test
public void testAggregate(){List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
operations.add(Aggregation.match(criteria));
ProjectionOperation projectionOperation;
AggregationExpression aggregationExpression = ArithmeticOperators.Add.valueOf("english")
.add("maths")
.add("chinese");
projectionOperation = Aggregation.project().and(aggregationExpression).as("total");
operations.add(projectionOperation);
Aggregation aggregation1 = Aggregation.newAggregation(operations)
.withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Map> aggregationResults1 =
mongoTemplate.aggregate(aggregation1, "student", Map.class);
System.out.println(aggregationResults1.getMappedResults());
}
/**
* 怎么多个 $or 一起操作。* "pipeline" : [{"$match" : { "name" : "张三", "$or" : [{ "maths" : { "$gte" : 90}}, {"english" : { "$gte" : 90}}, {"chinese" : { "$gte" : 90}}]}}]
*/
@Test
public void testOrOperation(){List<AggregationOperation> operations = Lists.newArrayList();
Criteria criteria = new Criteria();
criteria = criteria.and("name").is("张三");
Criteria criteria1 = new Criteria().and("maths").gte(90);
Criteria criteria2 = new Criteria().and("english").gte(90);
Criteria criteria3 = new Criteria().and("chinese").gte(90);
criteria = criteria.orOperator(criteria1, criteria2, criteria3);
operations.add(Aggregation.match(criteria));
Aggregation aggregation = Aggregation.newAggregation(operations).withOptions(newAggregationOptions().allowDiskUse(true).build());
AggregationResults<Student> results = mongoTemplate.aggregate(aggregation, "student", Student.class);
System.out.println(results.getMappedResults());
}
@Setter
@Getter
@ToString
@Document(Student.COLLECTION)
@Builder
static class Student{
public static final String COLLECTION = "student";
public static final String MATHS = "maths";
public static final String CHINESE = "chinese";
public static final String ENGLISH = "english";
public static final String PHYSICS = "physics";
public static final String CHEMISTRY = "chemistry";
public static final String BIOLOGY = "biology";
@Id
private String id;
private String name;
private int age;
private int maths;
private int chinese;
private int english;
private int physics;
private int chemistry;
private int biology;
}
@Setter
@Getter
@ToString
@Document(Book.COLLECTION)
@Builder
static class Book {
public static final String COLLECTION = "book";
@Id
private String id;
private String title;
private String author;
private int copies; // 库存数
private String type;
}
}
正文完