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获取和标量查询

本指南演示如何通过 ID 获取实体并进行标量过滤。标量过滤可检索符合指定过滤条件的实体。

概述

标量查询使用布尔表达式根据定义的条件过滤集合中的实体。查询结果是一组符合定义条件的实体。与向量搜索（在集合中识别与给定向量最接近的向量）不同，查询是根据特定条件过滤实体。

在 Milvus 中，过滤器总是一个由字段名和运算符组成的字符串。在本指南中，你将看到各种过滤器示例。要了解更多运算符详情，请参阅参考资料部分。

准备工作

以下步骤将重新利用代码连接到 Milvus，快速建立一个集合，并在集合中插入 1000 多个随机生成的实体。

步骤 1：创建集合

使用 MilvusClient连接到 Milvus 服务器，并使用 create_collection()来创建集合。

使用 MilvusClientV2连接到 Milvus 服务器并 createCollection()创建收藏集。

使用 MilvusClient连接到 Milvus 服务器并 createCollection()创建集合。

Python Java Node.js
from pymilvus import MilvusClient

# 1. Set up a Milvus client
client = MilvusClient(
    uri="http://localhost:19530"
)

# 2. Create a collection
client.create_collection(
    collection_name="quick_setup",
    dimension=5,
)

String CLUSTER_ENDPOINT = "http://localhost:19530";

// 1. Connect to Milvus server
ConnectConfig connectConfig = ConnectConfig.builder()
    .uri(CLUSTER_ENDPOINT)
    .build();

MilvusClientV2 client = new MilvusClientV2(connectConfig);  

// 2. Create a collection in quick setup mode
CreateCollectionReq quickSetupReq = CreateCollectionReq.builder()
    .collectionName("quick_setup")
    .dimension(5)
    .metricType("IP")
    .build();

client.createCollection(quickSetupReq);

const { MilvusClient, DataType, sleep } = require("@zilliz/milvus2-sdk-node")

const address = "http://localhost:19530"

// 1. Set up a Milvus Client
client = new MilvusClient({address}); 

// 2. Create a collection in quick setup mode
await client.createCollection({
    collection_name: "quick_setup",
    dimension: 5,
});

第二步：插入随机生成的实体

使用 insert()将实体插入集合。

使用 insert()将实体插入集合。

使用 insert()将实体插入集合。

Python Java Node.js
# 3. Insert randomly generated vectors 
colors = ["green", "blue", "yellow", "red", "black", "white", "purple", "pink", "orange", "brown", "grey"]
data = []

for i in range(1000):
    current_color = random.choice(colors)
    current_tag = random.randint(1000, 9999)
    data.append({
        "id": i,
        "vector": [ random.uniform(-1, 1) for _ in range(5) ],
        "color": current_color,
        "tag": current_tag,
        "color_tag": f"{current_color}_{str(current_tag)}"
    })

print(data[0])

# Output
#
# {
#     "id": 0,
#     "vector": [
#         0.7371107800002366,
#         -0.7290389773227746,
#         0.38367002049157417,
#         0.36996000494220627,
#         -0.3641898951462792
#     ],
#     "color": "yellow",
#     "tag": 6781,
#     "color_tag": "yellow_6781"
# }

res = client.insert(
    collection_name="quick_setup",
    data=data
)

print(res)

# Output
#
# {
#     "insert_count": 1000,
#     "ids": [
#         0,
#         1,
#         2,
#         3,
#         4,
#         5,
#         6,
#         7,
#         8,
#         9,
#         "(990 more items hidden)"
#     ]
# }

// 3. Insert randomly generated vectors into the collection
List<String> colors = Arrays.asList("green", "blue", "yellow", "red", "black", "white", "purple", "pink", "orange", "brown", "grey");
List<JSONObject> data = new ArrayList<>();

for (int i=0; i<1000; i++) {
    Random rand = new Random();
    String current_color = colors.get(rand.nextInt(colors.size()-1));
    int current_tag = rand.nextInt(8999) + 1000;
    JSONObject row = new JSONObject();
    row.put("id", Long.valueOf(i));
    row.put("vector", Arrays.asList(rand.nextFloat(), rand.nextFloat(), rand.nextFloat(), rand.nextFloat(), rand.nextFloat()));
    row.put("color", current_color);
    row.put("tag", current_tag);
    row.put("color_tag", current_color + '_' + String.valueOf(rand.nextInt(8999) + 1000));
    data.add(row);
}

InsertReq insertReq = InsertReq.builder()
    .collectionName("quick_setup")
    .data(data)
    .build();

InsertResp insertResp = client.insert(insertReq);

System.out.println(JSONObject.toJSON(insertResp));

// Output:
// {"insertCnt": 1000}

// 3. Insert randomly generated vectors
const colors = ["green", "blue", "yellow", "red", "black", "white", "purple", "pink", "orange", "brown", "grey"]
var data = []

for (let i = 0; i < 1000; i++) {
    current_color = colors[Math.floor(Math.random() * colors.length)]
    current_tag = Math.floor(Math.random() * 8999 + 1000)
    data.push({
        "id": i,
        "vector": [Math.random(), Math.random(), Math.random(), Math.random(), Math.random()],
        "color": current_color,
        "tag": current_tag,
        "color_tag": `${current_color}_${current_tag}`
    })
}

console.log(data[0])

// Output
// 
// {
//   id: 0,
//   vector: [
//     0.16022394821966035,
//     0.6514875214491056,
//     0.18294484964044666,
//     0.30227694168725394,
//     0.47553087493572255
//   ],
//   color: 'blue',
//   tag: 8907,
//   color_tag: 'blue_8907'
// }
// 

res = await client.insert({
    collection_name: "quick_setup",
    data: data
})

console.log(res.insert_cnt)

// Output
// 
// 1000
//

第 3 步：创建分区并插入更多实体

使用 create_partition()创建分区，并使用 insert()向集合中插入更多实体。

使用 createPartition()创建分区并 insert()向集合中插入更多实体。

使用 createPartition()创建分区，并 insert()向集合中插入更多实体。

Python Java Node.js
# 4. Create partitions and insert more entities
client.create_partition(
    collection_name="quick_setup",
    partition_name="partitionA"
)

client.create_partition(
    collection_name="quick_setup",
    partition_name="partitionB"
)

data = []

for i in range(1000, 1500):
    current_color = random.choice(colors)
    data.append({
        "id": i,
        "vector": [ random.uniform(-1, 1) for _ in range(5) ],
        "color": current_color,
        "tag": current_tag,
        "color_tag": f"{current_color}_{str(current_tag)}"
    })

res = client.insert(
    collection_name="quick_setup",
    data=data,
    partition_name="partitionA"
)

print(res)

# Output
#
# {
#     "insert_count": 500,
#     "ids": [
#         1000,
#         1001,
#         1002,
#         1003,
#         1004,
#         1005,
#         1006,
#         1007,
#         1008,
#         1009,
#         "(490 more items hidden)"
#     ]
# }

data = []

for i in range(1500, 2000):
    current_color = random.choice(colors)
    data.append({
        "id": i,
        "vector": [ random.uniform(-1, 1) for _ in range(5) ],
        "color": current_color,
        "tag": current_tag,
        "color_tag": f"{current_color}_{str(current_tag)}"
    })

res = client.insert(
    collection_name="quick_setup",
    data=data,
    partition_name="partitionB"
)

print(res)

# Output
#
# {
#     "insert_count": 500,
#     "ids": [
#         1500,
#         1501,
#         1502,
#         1503,
#         1504,
#         1505,
#         1506,
#         1507,
#         1508,
#         1509,
#         "(490 more items hidden)"
#     ]
# }

// 4. Create partitions and insert some more data
CreatePartitionReq createPartitionReq = CreatePartitionReq.builder()
    .collectionName("quick_setup")
    .partitionName("partitionA")
    .build();

client.createPartition(createPartitionReq);

createPartitionReq = CreatePartitionReq.builder()
    .collectionName("quick_setup")
    .partitionName("partitionB")
    .build();

client.createPartition(createPartitionReq);

data.clear();

for (int i=1000; i<1500; i++) {
    Random rand = new Random();
    String current_color = colors.get(rand.nextInt(colors.size()-1));
    int current_tag = rand.nextInt(8999) + 1000;
    JSONObject row = new JSONObject();
    row.put("id", Long.valueOf(i));
    row.put("vector", Arrays.asList(rand.nextFloat(), rand.nextFloat(), rand.nextFloat(), rand.nextFloat(), rand.nextFloat()));
    row.put("color", current_color);
    row.put("tag", current_tag);
    data.add(row);
}

insertReq = InsertReq.builder()
    .collectionName("quick_setup")
    .data(data)
    .partitionName("partitionA")
    .build();

insertResp = client.insert(insertReq);

System.out.println(JSONObject.toJSON(insertResp));

// Output:
// {"insertCnt": 500}

data.clear();

for (int i=1500; i<2000; i++) {
    Random rand = new Random();
    String current_color = colors.get(rand.nextInt(colors.size()-1));
    int current_tag = rand.nextInt(8999) + 1000;
    JSONObject row = new JSONObject();
    row.put("id", Long.valueOf(i));
    row.put("vector", Arrays.asList(rand.nextFloat(), rand.nextFloat(), rand.nextFloat(), rand.nextFloat(), rand.nextFloat()));
    row.put("color", current_color);
    row.put("tag", current_tag);
    data.add(row);
}

insertReq = InsertReq.builder()
    .collectionName("quick_setup")
    .data(data)
    .partitionName("partitionB")
    .build();

insertResp = client.insert(insertReq);

System.out.println(JSONObject.toJSON(insertResp));

// Output:
// {"insertCnt": 500}

// 4. Create partitions and insert more entities
await client.createPartition({
    collection_name: "quick_setup",
    partition_name: "partitionA"
})

await client.createPartition({
    collection_name: "quick_setup",
    partition_name: "partitionB"
})

data = []

for (let i = 1000; i < 1500; i++) {
    current_color = colors[Math.floor(Math.random() * colors.length)]
    current_tag = Math.floor(Math.random() * 8999 + 1000)
    data.push({
        "id": i,
        "vector": [Math.random(), Math.random(), Math.random(), Math.random(), Math.random()],
        "color": current_color,
        "tag": current_tag,
        "color_tag": `${current_color}_${current_tag}`
    })
}

res = await client.insert({
    collection_name: "quick_setup",
    data: data,
    partition_name: "partitionA"
})

console.log(res.insert_cnt)

// Output
// 
// 500
// 

await sleep(5000)

data = []

for (let i = 1500; i < 2000; i++) {
    current_color = colors[Math.floor(Math.random() * colors.length)]
    current_tag = Math.floor(Math.random() * 8999 + 1000)
    data.push({
        "id": i,
        "vector": [Math.random(), Math.random(), Math.random(), Math.random(), Math.random()],
        "color": current_color,
        "tag": current_tag,
        "color_tag": `${current_color}_${current_tag}`
    })
}

res = await client.insert({
    collection_name: "quick_setup",
    data: data,
    partition_name: "partitionB"
})

console.log(res.insert_cnt)

// Output
// 
// 500
//

按 ID 获取实体

如果您知道感兴趣的实体的 ID，可以使用 get()方法。

如果知道感兴趣的实体的 ID，可以使用 get()方法。

如果您知道您感兴趣的实体的 ID，可以使用 get()方法。

Python Java Node.js
# 4. Get entities by ID
res = client.get(
    collection_name="quick_setup",
    ids=[0, 1, 2]
)

print(res)

# Output
#
# [
#     {
#         "id": 0,
#         "vector": [
#             0.68824464,
#             0.6552274,
#             0.33593303,
#             -0.7099536,
#             -0.07070546
#         ],
#         "color_tag": "green_2006",
#         "color": "green"
#     },
#     {
#         "id": 1,
#         "vector": [
#             -0.98531723,
#             0.33456197,
#             0.2844234,
#             0.42886782,
#             0.32753858
#         ],
#         "color_tag": "white_9298",
#         "color": "white"
#     },
#     {
#         "id": 2,
#         "vector": [
#             -0.9886812,
#             -0.44129863,
#             -0.29859528,
#             0.06059075,
#             -0.43817034
#         ],
#         "color_tag": "grey_5312",
#         "color": "grey"
#     }
# ]

// 5. Get entities by ID
GetReq getReq = GetReq.builder()
    .collectionName("quick_setup")
    .ids(Arrays.asList(0L, 1L, 2L))
    .build();

GetResp entities = client.get(getReq);

System.out.println(JSONObject.toJSON(entities));

// Output:
// {"getResults": [
//     {"entity": {
//         "color": "white",
//         "color_tag": "white_4597",
//         "vector": [
//             0.09665024,
//             0.1163497,
//             0.0701347,
//             0.32577968,
//             0.40943468
//         ],
//         "tag": 8946,
//         "id": 0
//     }},
//     {"entity": {
//         "color": "green",
//         "color_tag": "green_3039",
//         "vector": [
//             0.90689456,
//             0.4377399,
//             0.75387514,
//             0.36454988,
//             0.8702918
//         ],
//         "tag": 2341,
//         "id": 1
//     }},
//     {"entity": {
//         "color": "white",
//         "color_tag": "white_8708",
//         "vector": [
//             0.9757728,
//             0.13974023,
//             0.8023141,
//             0.61947155,
//             0.8290197
//         ],
//         "tag": 9913,
//         "id": 2
//     }}
// ]}

// 5. Get entities by id
res = await client.get({
    collection_name: "quick_setup",
    ids: [0, 1, 2],
    output_fields: ["vector", "color_tag"]
})

console.log(res.data)

// Output
// 
// [
//   {
//     vector: [
//       0.16022394597530365,
//       0.6514875292778015,
//       0.18294484913349152,
//       0.30227693915367126,
//       0.47553086280822754
//     ],
//     '$meta': { color: 'blue', tag: 8907, color_tag: 'blue_8907' },
//     id: '0'
//   },
//   {
//     vector: [
//       0.2459285855293274,
//       0.4974019527435303,
//       0.2154673933982849,
//       0.03719571232795715,
//       0.8348019123077393
//     ],
//     '$meta': { color: 'grey', tag: 3710, color_tag: 'grey_3710' },
//     id: '1'
//   },
//   {
//     vector: [
//       0.9404329061508179,
//       0.49662265181541443,
//       0.8088793158531189,
//       0.9337621331214905,
//       0.8269071578979492
//     ],
//     '$meta': { color: 'blue', tag: 2993, color_tag: 'blue_2993' },
//     id: '2'
//   }
// ]
//

从分区获取实体

您还可以从特定分区中获取实体。

Python Java Node.js
# 5. Get entities from partitions
res = client.get(
    collection_name="quick_setup",
    ids=[1000, 1001, 1002],
    partition_names=["partitionA"]
)

print(res)

# Output
#
# [
#     {
#         "color": "green",
#         "tag": 1995,
#         "color_tag": "green_1995",
#         "id": 1000,
#         "vector": [
#             0.7807706,
#             0.8083741,
#             0.17276904,
#             -0.8580777,
#             0.024156934
#         ]
#     },
#     {
#         "color": "red",
#         "tag": 1995,
#         "color_tag": "red_1995",
#         "id": 1001,
#         "vector": [
#             0.065074645,
#             -0.44882354,
#             -0.29479212,
#             -0.19798489,
#             -0.77542555
#         ]
#     },
#     {
#         "color": "green",
#         "tag": 1995,
#         "color_tag": "green_1995",
#         "id": 1002,
#         "vector": [
#             0.027934508,
#             -0.44199976,
#             -0.40262738,
#             -0.041511405,
#             0.024782438
#         ]
#     }
# ]

// 5. Get entities by ID in a partition
getReq = GetReq.builder()
    .collectionName("quick_setup")
    .ids(Arrays.asList(1001L, 1002L, 1003L))
    .partitionName("partitionA")
    .build();

entities = client.get(getReq);

System.out.println(JSONObject.toJSON(entities));

// Output:
// {"getResults": [
//     {"entity": {
//         "color": "yellow",
//         "vector": [
//             0.4300114,
//             0.599917,
//             0.799163,
//             0.75395125,
//             0.89947814
//         ],
//         "id": 1001,
//         "tag": 5803
//     }},
//     {"entity": {
//         "color": "blue",
//         "vector": [
//             0.009218454,
//             0.64637834,
//             0.19815737,
//             0.30519038,
//             0.8218663
//         ],
//         "id": 1002,
//         "tag": 7212
//     }},
//     {"entity": {
//         "color": "black",
//         "vector": [
//             0.76521933,
//             0.7818409,
//             0.16976339,
//             0.8719652,
//             0.1434964
//         ],
//         "id": 1003,
//         "tag": 1710
//     }}
// ]}

// 5.1 Get entities by id in a partition
res = await client.get({
    collection_name: "quick_setup",
    ids: [1000, 1001, 1002],
    partition_names: ["partitionA"],
    output_fields: ["vector", "color_tag"]
})

console.log(res.data)

// Output
// 
// [
//   {
//     id: '1000',
//     vector: [
//       0.014254206791520119,
//       0.5817716121673584,
//       0.19793470203876495,
//       0.8064294457435608,
//       0.7745839357376099
//     ],
//     '$meta': { color: 'white', tag: 5996, color_tag: 'white_5996' }
//   },
//   {
//     id: '1001',
//     vector: [
//       0.6073881983757019,
//       0.05214758217334747,
//       0.730999231338501,
//       0.20900958776474,
//       0.03665429726243019
//     ],
//     '$meta': { color: 'grey', tag: 2834, color_tag: 'grey_2834' }
//   },
//   {
//     id: '1002',
//     vector: [
//       0.48877206444740295,
//       0.34028753638267517,
//       0.6527213454246521,
//       0.9763909578323364,
//       0.8031482100486755
//     ],
//     '$meta': { color: 'pink', tag: 9107, color_tag: 'pink_9107' }
//   }
// ]
//

使用基本运算符

在本节中，您将找到如何在标量过滤中使用基本运算符的示例。您也可以将这些筛选器应用于向量搜索和数据删除。

有关详细信息，请参阅 query()中的

更多信息，请参阅 query()以获取更多信息。

更多信息，请参阅 query()中的

  • 过滤标签值在 1,000 至 1,500 之间的实体。

    Python JavaNode.js

    # 6. Use basic operators

res = client.query(
    collection_name="quick_setup",
    filter="1000 < tag < 1500",
    output_fields=["color_tag"],
    limit=3
)

print(res)

# Output
#
# [
#     {
#         "id": 1,
#         "color_tag": "pink_1023"
#     },
#     {
#         "id": 41,
#         "color_tag": "red_1483"
#     },
#     {
#         "id": 44,
#         "color_tag": "grey_1146"
#     }
# ]

    // 6. Use basic operators

QueryReq queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("1000 < tag < 1500")
    .outputFields(Arrays.asList("color_tag"))
    .limit(3)
    .build();

QueryResp queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));

// Output:
// {"queryResults": [
//     {"entity": {
//         "color_tag": "white_7588",
//         "id": 34
//     }},
//     {"entity": {
//         "color_tag": "orange_4989",
//         "id": 64
//     }},
//     {"entity": {
//         "color_tag": "white_3415",
//         "id": 73
//     }}
// ]}

    // 6. Use basic operators
res = await client.query({
    collection_name: "quick_setup",
    filter: "1000 < tag < 1500",
    output_fields: ["color_tag"],
    limit: 3
})

console.log(res.data)

// Output
// 
// [
//   {
//     '$meta': { color: 'pink', tag: 1050, color_tag: 'pink_1050' },
//     id: '6'
//   },
//   {
//     '$meta': { color: 'purple', tag: 1174, color_tag: 'purple_1174' },
//     id: '24'
//   },
//   {
//     '$meta': { color: 'orange', tag: 1023, color_tag: 'orange_1023' },
//     id: '40'
//   }
// ]
//

  • 过滤颜色值设置为棕色的实体。

    Python JavaNode.js

    res = client.query(
    collection_name="quick_setup",
    filter='color == "brown"',
    output_fields=["color_tag"],
    limit=3
)

print(res)

# Output
#
# [
#     {
#         "color_tag": "brown_5343",
#         "id": 15
#     },
#     {
#         "color_tag": "brown_3167",
#         "id": 27
#     },
#     {
#         "color_tag": "brown_3100",
#         "id": 30
#     }
# ]

    queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("color == \"brown\"")
    .outputFields(Arrays.asList("color_tag"))
    .limit(3)
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));

// Output:
// {"queryResults": [
//     {"entity": {
//         "color_tag": "brown_7792",
//         "id": 3
//     }},
//     {"entity": {
//         "color_tag": "brown_9695",
//         "id": 7
//     }},
//     {"entity": {
//         "color_tag": "brown_2551",
//         "id": 15
//     }}
// ]}

    res = await client.query({
    collection_name: "quick_setup",
    filter: 'color == "brown"',
    output_fields: ["color_tag"],
    limit: 3
})

console.log(res.data)

// Output
// 
// [
//   {
//     '$meta': { color: 'brown', tag: 6839, color_tag: 'brown_6839' },
//     id: '22'
//   },
//   {
//     '$meta': { color: 'brown', tag: 7849, color_tag: 'brown_7849' },
//     id: '32'
//   },
//   {
//     '$meta': { color: 'brown', tag: 7855, color_tag: 'brown_7855' },
//     id: '33'
//   }
// ]
//

  • 过滤颜色值未设置为绿色和紫色的实体。

    Python JavaNode.js

    res = client.query(
    collection_name="quick_setup",
    filter='color not in ["green", "purple"]',
    output_fields=["color_tag"],
    limit=3
)

print(res)

# Output
#
# [
#     {
#         "color_tag": "yellow_6781",
#         "id": 0
#     },
#     {
#         "color_tag": "pink_1023",
#         "id": 1
#     },
#     {
#         "color_tag": "blue_3972",
#         "id": 2
#     }
# ]

    queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("color not in [\"green\", \"purple\"]")
    .outputFields(Arrays.asList("color_tag"))
    .limit(3)
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));   

// Output:
// {"queryResults": [
//     {"entity": {
//         "color_tag": "white_4597",
//         "id": 0
//     }},
//     {"entity": {
//         "color_tag": "white_8708",
//         "id": 2
//     }},
//     {"entity": {
//         "color_tag": "brown_7792",
//         "id": 3
//     }}
// ]}

    res = await client.query({
    collection_name: "quick_setup",
    filter: 'color not in ["green", "purple"]',
    output_fields: ["color_tag"],
    limit: 3
})

console.log(res.data)

// Output
// 
// [
//   {
//     '$meta': { color: 'blue', tag: 8907, color_tag: 'blue_8907' },
//     id: '0'
//   },
//   {
//     '$meta': { color: 'grey', tag: 3710, color_tag: 'grey_3710' },
//     id: '1'
//   },
//   {
//     '$meta': { color: 'blue', tag: 2993, color_tag: 'blue_2993' },
//     id: '2'
//   }
// ]
//

  • 过滤颜色标记以红色开头的文章。

    Python JavaNode.js

    res = client.query(
    collection_name="quick_setup",
    filter='color_tag like "red%"',
    output_fields=["color_tag"],
    limit=3
)

print(res)

# Output
#
# [
#     {
#         "color_tag": "red_6443",
#         "id": 17
#     },
#     {
#         "color_tag": "red_1483",
#         "id": 41
#     },
#     {
#         "color_tag": "red_4348",
#         "id": 47
#     }
# ]

    queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("color_tag like \"red%\"")
    .outputFields(Arrays.asList("color_tag"))
    .limit(3)
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));  

// Output:
// {"queryResults": [
//     {"entity": {
//         "color_tag": "red_4929",
//         "id": 9
//     }},
//     {"entity": {
//         "color_tag": "red_8284",
//         "id": 13
//     }},
//     {"entity": {
//         "color_tag": "red_3021",
//         "id": 44
//     }}
// ]}

    res = await client.query({
    collection_name: "quick_setup",
    filter: 'color_tag like "red%"',
    output_fields: ["color_tag"],
    limit: 3
})

console.log(res.data)

// Output
// 
// [
//   {
//     '$meta': { color: 'red', tag: 8773, color_tag: 'red_8773' },
//     id: '17'
//   },
//   {
//     '$meta': { color: 'red', tag: 9197, color_tag: 'red_9197' },
//     id: '34'
//   },
//   {
//     '$meta': { color: 'red', tag: 7914, color_tag: 'red_7914' },
//     id: '46'
//   }
// ]
//

  • 过滤颜色设置为红色且标签值在 1,000 至 1,500 范围内的实体。

    Python JavaNode.js

    res = client.query(
    collection_name="quick_setup",
    filter='(color == "red") and (1000 < tag < 1500)',
    output_fields=["color_tag"],
    limit=3
)

print(res)

# Output
#
# [
#     {
#         "color_tag": "red_1483",
#         "id": 41
#     },
#     {
#         "color_tag": "red_1100",
#         "id": 94
#     },
#     {
#         "color_tag": "red_1343",
#         "id": 526
#     }
# ]

    queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("(color == \"red\") and (1000 < tag < 1500)")
    .outputFields(Arrays.asList("color_tag"))
    .limit(3)
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));  

// Output:
// {"queryResults": [
//     {"entity": {
//         "color_tag": "red_8124",
//         "id": 83
//     }},
//     {"entity": {
//         "color_tag": "red_5358",
//         "id": 501
//     }},
//     {"entity": {
//         "color_tag": "red_3564",
//         "id": 638
//     }}
// ]}

    res = await client.query({
    collection_name: "quick_setup",
    filter: '(color == "red") and (1000 < tag < 1500)',
    output_fields: ["color_tag"],
    limit: 3
})

console.log(res.data)

// Output
// 
// [
//   {
//     '$meta': { color: 'red', tag: 1436, color_tag: 'red_1436' },
//     id: '67'
//   },
//   {
//     '$meta': { color: 'red', tag: 1463, color_tag: 'red_1463' },
//     id: '160'
//   },
//   {
//     '$meta': { color: 'red', tag: 1073, color_tag: 'red_1073' },
//     id: '291'
//   }
// ]
//

使用高级操作符

本节将举例说明如何在标量过滤中使用高级运算符。您也可以将这些筛选器应用于向量搜索和数据删除。

计数实体

  • 计算集合中实体的总数。

    Python JavaNode.js

    # 7. Use advanced operators

# Count the total number of entities in a collection
res = client.query(
    collection_name="quick_setup",
    output_fields=["count(*)"]
)

print(res)

# Output
#
# [
#     {
#         "count(*)": 2000
#     }
# ]

    // 7. Use advanced operators
// Count the total number of entities in the collection
queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("")
    .outputFields(Arrays.asList("count(*)"))
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));

// Output:
// {"queryResults": [{"entity": {"count(*)": 2000}}]}

    // 7. Use advanced operators
// Count the total number of entities in a collection
res = await client.query({
    collection_name: "quick_setup",
    output_fields: ["count(*)"]
})

console.log(res.data)   

// Output
// 
// [ { 'count(*)': '2000' } ]
//

  • 计算特定分区中实体的总数。

    Python JavaNode.js

    # Count the number of entities in a partition
res = client.query(
    collection_name="quick_setup",
    output_fields=["count(*)"],
    partition_names=["partitionA"]
)

print(res)

# Output
#
# [
#     {
#         "count(*)": 500
#     }
# ]

    // Count the number of entities in a partition
queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .partitionNames(Arrays.asList("partitionA"))
    .filter("")
    .outputFields(Arrays.asList("count(*)"))
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));

// Output:
// {"queryResults": [{"entity": {"count(*)": 500}}]}

    // Count the number of entities in a partition
res = await client.query({
    collection_name: "quick_setup",
    output_fields: ["count(*)"],
    partition_names: ["partitionA"]
})

console.log(res.data)     

// Output
// 
// [ { 'count(*)': '500' } ]
//

  • 统计符合过滤条件的实体数量

    Python JavaNode.js

    # Count the number of entities that match a specific filter
res = client.query(
    collection_name="quick_setup",
    filter='(color == "red") and (1000 < tag < 1500)',
    output_fields=["count(*)"],
)

print(res)

# Output
#
# [
#     {
#         "count(*)": 3
#     }
# ]

    // Count the number of entities that match a specific filter
queryReq = QueryReq.builder()
    .collectionName("quick_setup")
    .filter("(color == \"red\") and (1000 < tag < 1500)")
    .outputFields(Arrays.asList("count(*)"))
    .build();

queryResp = client.query(queryReq);

System.out.println(JSONObject.toJSON(queryResp));

// Output:
// {"queryResults": [{"entity": {"count(*)": 7}}]}

    // Count the number of entities that match a specific filter
res = await client.query({
    collection_name: "quick_setup",
    filter: '(color == "red") and (1000 < tag < 1500)',
    output_fields: ["count(*)"]
})

console.log(res.data)   

// Output
// 
// [ { 'count(*)': '10' } ]
//

标量过滤器参考

基本运算符

布尔表达式始终是由字段名和操作符组成的字符串。本节将详细介绍基本运算符。

操作符说明
和 (&&)如果两个操作数都为真，则为真
或 (||)如果任一操作数为真，则为真
+, -, *, /加法、减法、乘法和除法
**指数
%模数
<, >小于、大于
==, !=等于，不等于
<=, >=小于或等于，大于或等于
不等于逆转给定条件的结果。
相似使用通配符将一个值与类似值进行比较。
例如，like "prefix%"匹配以 "prefix "开头的字符串。
in测试表达式是否匹配值列表中的任何值。

高级运算符

  • count(*)

    计算集合中实体的确切数量。将其用作输出字段，可获得集合或分区中实体的确切数目。

    注释

    这适用于已加载的集合。应将其作为唯一的输出字段。

翻译自DeepLogo

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