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# \$1eq
<a name="eq"></a>

Amazon DocumentDB 中的`$eq`运算符用于匹配字段值等于指定值的文档。该运算符通常用于检索符合指定条件的文档`find()`的方法。

**参数**
+ `field`：要检查相等条件的字段。
+ `value`：要与字段进行比较的值。

## 示例（MongoDB 外壳）
<a name="eq-examples"></a>

以下示例演示如何使用`$eq`运算符来查找该`name`字段等于的所有文档`"Thai Curry Palace"`。

**创建示例文档**

```
db.restaurants.insertMany([
  { name: "Thai Curry Palace", cuisine: "Thai", features: ["Private Dining"] },
  { name: "Italian Bistro", cuisine: "Italian", features: ["Outdoor Seating"] },
  { name: "Mexican Grill", cuisine: "Mexican", features: ["Takeout"] }
]);
```

**查询示例**

```
db.restaurants.find({ name: { $eq: "Thai Curry Palace" } });
```

**输出**

```
{ "_id" : ObjectId("68ee586f916df9d39f3d9414"), "name" : "Thai Curry Palace", "cuisine" : "Thai", "features" : [ "Private Dining" ] }
```

## 代码示例
<a name="eq-code"></a>

要查看使用该`$eq`命令的代码示例，请选择要使用的语言的选项卡：

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function findByName(name) {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('restaurants');

  const results = await collection.find({ name: { $eq: name } }).toArray();
  console.log(results);

  await client.close();
}

findByName("Thai Curry Palace");
```

------
#### [ Python ]

```
from pymongo import MongoClient

def find_by_name(name):
    client = MongoClient("mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false")
    db = client["test"]
    collection = db["restaurants"]

    results = list(collection.find({ "name": { "$eq": name } }))
    print(results)

    client.close()

find_by_name("Thai Curry Palace")
```

------