使用MongoTemplate创建搜索索引？

Question

我们如何Indexes使用以下查询创建MongoTemplate？我指的是网站http://docs.mongodb.org/v2.4/tutorial/search-for-text/他们没有提供有关如何使用MongoTemplate创建索引的任何细节？

db.getCollection('user').ensureIndex({ firstName: "text", middleName : 
"text", lastName : "text",emailId:"text" });

Answer 1

假设您的实体User被建模为

@Document
class User {
    String firstName;
    String middleName;
    String lastName;
    String emailId;
}

并希望有一个基于firstName,middleName,lastName和emailId字段的文本索引,原始的MongoDB索引定义如下所示:

 { 
    firstName: "text", 
    middleName: "text", 
    lastName: "text",
    emailId: "text" 
}

要在上面的字段中创建文本索引,您希望启用全文搜索,请执行以下操作

TextIndexDefinition textIndex = new TextIndexDefinitionBuilder()
    .onField("firstName")
    .onField("middleName")
    .onField("lastName")
    .onField("emailId")
    .build();

MongoTemplate mongoTemplate = new MongoTemplate(new Mongo(), "database"); // obtain MongoTemplate
mongoTemplate.indexOps(User.class).ensureIndex(textIndex);

或者您可以通过映射注释自动创建索引:

@Document
class User {
    @TextIndexed String firstName;
    @TextIndexed String middleName;
    @TextIndexed String lastName;
    @TextIndexed String emailId;
}

Answer 2

使用spring Java在mongo中创建索引的最简单方法是:

// Define ur mongo template defination

DBObject indexOptions = new BasicDBObject();
indexOptions.put("a", 1);
indexOptions.put("b", 1);
indexOptions.put("c.d", 1);
indexOptions.put("e.f", 1);
CompoundIndexDefinition indexDefinition =
            new CompoundIndexDefinition(indexOptions);
mongoTemplate.indexOps(<Classname>.class).ensureIndex(indexDefinition);

可以在索引定义上配置唯一索引: mongoTemplate.indexOps(<Classname>.class).ensureIndex(indexDefinition.unique());