2024 .search.json

I'm implementing simple search engine.all the data saved as a JSON in text file. My implementing scenario is,If I search word like 'rock' method should return result as list of tag Id's containing 'rock' value.I have been looking for sample codes but in every exsample they search by tag like track_id" but I need search by value.. Castingcouch hd

For reasons beyond my control, I need to search for the same key value in JSONs with different structures. I a code that is able to find the value of "valor", and no matter what is the structure of the JSON, there always will be a vendor key somewhere inside it. By now I have two examples of JSON that I receive:JSON_SEARCH(json_doc, one_or_all, search_str[, escape_char[, path] ...]) Returns the path to the given string within a JSON document. Returns NULL if any of the json_doc , search_str , or path arguments are NULL ; no path exists within the document; or search_str is not found.Jul 20, 2015 · How do I go about finding the "price" of the JSON object who's symbol is ("symbol" : "XAG=X") for example. In this case the answer is ("price" : "0.067476"). I need to perform this lookup programatically since the JSON is rather larger than the one presented here and the only parameter given to me will be the "symbol". Is this possible? Jun 23, 2020 · Using powershell I would like to search for "node" key1B and select it. The assumptions are. The search term (key1B) can either be a root element or a child of a root element. If I were to know the parent under which node key1B is I could use below: Get-Content -Raw my.json | ConvertFrom-Json | Select-Object -ExpandProperty key1 | Select-Object ... Get Started with Elasticsearch. Video. Intro to Kibana. Video. ELK for Logs & Metrics.Aug 28, 2023 · Open Library is an open, editable library catalog, building towards a web page for every book ever published. Read, borrow, and discover more than 3M books for free. If I search "cars", it returns 2 results, and the rest of my code won't recognize the objects. (Plus, I know there's more than 2 results for cars). Any idea on how to modify the URL?May 25, 2018 · I am searching for lucene query to search this JSON message having . orders > 30 and version > 3.4 Any help is appreciated [Updated] I am using logback-elasticsearch-appender to push messages into ElasticSearch using SLF4j. log.info(new org.json.JSONOject(arg).toString()); Export Search Results. The Search API is a unified search API that returns tickets, users, and organizations. You can define filters to narrow your search results according to resource type, dates, and object properties, such as ticket requester or tag. To search articles in Help Center, see Search in the Help Center API documentation. How to search/find In JSON with java. I have a below JSON string from the below i want to find/search criteria in JSON String. To find the Number of keys present. { "store": { "book": [ { "category": "reference", "author": "Nigel Rees", "title": "Sayings of the Century", "price": 8.95 }, { "category": "fiction", "author": "Evelyn Waugh", "title ...Using python to search json for a value. 0. Parsing Json in Python and find a value. 1. Searching for a value in JSON array. 0.@dig: Search for a value without providing its entire path. See e8e87f2. Modifier arguments. A modifier may accept an optional argument. The argument can be a valid JSON document or just characters. For example, the @pretty modifier takes a json object as its argument.Jul 29, 2018 · You'll first need to invoke parse_json () on your column (unless it's already typed as dynamic and not as string, in which case you can skip this step). Then you can access the Date property in your JSON value and use todatetime () to cast it to type datetime. Afterwards, you can filter by your external parameter ( dateTimeLowerBound in the ... Azure Cognitive Search can index JSON documents and arrays in Azure Blob Storage using an indexer that knows how to read semi-structured data. Semi-structured data contains tags or markings which separate content within the data. It splits the difference between unstructured data, which must be fully indexed, and formally structured data that ...Jul 29, 2018 · You'll first need to invoke parse_json () on your column (unless it's already typed as dynamic and not as string, in which case you can skip this step). Then you can access the Date property in your JSON value and use todatetime () to cast it to type datetime. Afterwards, you can filter by your external parameter ( dateTimeLowerBound in the ... Feb 28, 2022 · The search query. Only 20 results of each type will be returned for each page, but a total count is returned with each query. page=1 (the default) will return items 1-20, page=2 will return items 21-30, etc. This allows you to limit the number of results of each type per page, up to a maximum of 20, the default value. Description. Returns the path to the given string within a JSON document, or NULL if any of json_doc, search_str or a path argument is NULL; if the search string is not found, or if no path exists within the document. A warning will occur if the JSON document is not valid, any of the path arguments are not valid, if return_arg is neither one ... Understand the power of WordPress Search Form Action URL and how it can be integrated with the Google Custom Search JSON API. Learn how to enhance your website's search functionality by leveraging the capabilities of both WordPress and Google's API. Discover the benefits and possibilities of combining these two technologies for an optimized search experience on your WordPress site.I am searching for lucene query to search this JSON message having . orders > 30 and version > 3.4 Any help is appreciated [Updated] I am using logback-elasticsearch-appender to push messages into ElasticSearch using SLF4j. log.info(new org.json.JSONOject(arg).toString());Here is my JSON String. Now i want to search for name in this JSON and then display the results... javascript; json; Share. Improve this question. FollowAdd JSON documents. After you create an index, Redis Stack automatically indexes any existing, modified, or newly created JSON documents stored in the database. For existing documents, indexing runs asynchronously in the background, so it can take some time before the document is available. Modified and newly created documents are indexed ...Using powershell I would like to search for "node" key1B and select it. The assumptions are. The search term (key1B) can either be a root element or a child of a root element. If I were to know the parent under which node key1B is I could use below: Get-Content -Raw my.json | ConvertFrom-Json | Select-Object -ExpandProperty key1 | Select-Object ...Feb 5, 2014 · I'm trying to get started with Yammer API. I have been able to go through the oauth process and obtain the token. Now, I just want to perform searches within the current user's account. The Yammer... Simple Steps to Create Live Search using JSON and jQuery. Let’s create a ‘live-search’ project which can be located anywhere on your computer. Creating a index.html file and writing all the below steps code into this file. Step 1: We need a sample json data for live search.3. With MySQL pre-8.0, there is no easy way to turn a JSON array to a recordset (ie, function JSON_TABLE () is not yet available). So, one way or another, we need to manually iterate through the array to extract the relevant pieces of data (using JSON_EXTRACT () ). Here is a solution that uses an inline query to generate a list of numbers ...A JSON path that specifies the object or the array to extract. In SQL Server 2017 (14.x) and in Azure SQL Database, you can provide a variable as the value of path. The JSON path can specify lax or strict mode for parsing. If you don't specify the parsing mode, lax mode is the default. For more info, see JSON Path Expressions (SQL Server).Oct 30, 2022 · I want to use Powershell to recursively search a JSON for a string, and then have it report back the path to the value and what the value was. In this example I want to search the whole JSON for any key that has 'corset' in its value, and then return back that it was found in : Using python to search json for a value. 1. Searching for a value in JSON array. 0. Python: Searching for a data in JSON. Hot Network QuestionsLINQ to JSON provides a number of methods for getting data from its objects. The index methods on JObject/JArray let you quickly get data by its property name on an object or index in a collection, while Children () lets you get ranges of data as IEnumerable<JToken> to then query using LINQ. Getting values by Property Name or Collection Index. I've got a JSON stream coming back from a server, and I need to search for a specific value of the node "ID" using JSON.net to parse the data. And I can almost make it work, but not quite because the results coming back are deeply nested in each other -- this is due to the fact that I'm getting a folder structure back.This sample loads JSON and then queries values from it using P:Newtonsoft.Json.Linq.JToken.Item(System.Object) indexer and then casts the returned tokens to .NET values. Note that the function json_array_elements() is costly and you cannot use indexes in contrary to Abelisto's solution. However you have to use it if you want to have an access to values of nested json elements.Oct 30, 2022 · I want to use Powershell to recursively search a JSON for a string, and then have it report back the path to the value and what the value was. In this example I want to search the whole JSON for any key that has 'corset' in its value, and then return back that it was found in : Area=='" + searchKey + "')] json path expression is selecting the root level nodes using $. and searching for Area under Branches node using (@..Area='Devis') expression. Once an area is matched under the branches node the root level Area node is selected which includes other branch nodes as well. Other option is to explicitly select Branch ...JSON ( JavaScript Object Notation, pronounced / ˈdʒeɪsən /; also / ˈdʒeɪˌsɒn /) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and arrays (or other serializable values). Nov 27, 2016 · Using python to search json for a value. 0. Parsing Json in Python and find a value. 1. Searching for a value in JSON array. 0. This week we will take another look at some common data types we might encounter in the real world: JSON data. JSON data is used pretty frequently on the web if you’re hitting APIs. This not only includes external data (twitter, weather, marvel database), but often includes internal data to your company. It’s nice to be able to leverage ...By using this jquery regular expression can search JSON data by key and value pair and for display search data on web page we have use Jquery append () method. This method will append html code in particular HTML tag and that display on web page. Here search data like employee image, name and location will load below textbox in drop down list ...Area=='" + searchKey + "')] json path expression is selecting the root level nodes using $. and searching for Area under Branches node using (@..Area='Devis') expression. Once an area is matched under the branches node the root level Area node is selected which includes other branch nodes as well. Other option is to explicitly select Branch ...I want to use Powershell to recursively search a JSON for a string, and then have it report back the path to the value and what the value was. In this example I want to search the whole JSON for any key that has 'corset' in its value, and then return back that it was found in :How to search in JSON file? Ask Question Asked 7 years, 8 months ago Modified 7 years, 8 months ago Viewed 31k times Part of PHP Collective 5 How could I create a search form that will search for the entered term inside a JSON file? So if the search term is equal to a title inside the location object, it should return that object info. Description. Search the registry for packages matching the search terms. npm search performs a linear, incremental, lexically-ordered search through package metadata for all files in the registry. If your terminal has color support, it will further highlight the matches in the results. This can be disabled with the config item color. I've got a JSON stream coming back from a server, and I need to search for a specific value of the node "ID" using JSON.net to parse the data. And I can almost make it work, but not quite because the results coming back are deeply nested in each other -- this is due to the fact that I'm getting a folder structure back.The function should then check for the given key value pair in the JSON object. If there exists any object then the function should return an array of all such objects. We will use the following approach to solve this problem −How to search/find In JSON with java. I have a below JSON string from the below i want to find/search criteria in JSON String. To find the Number of keys present. { "store": { "book": [ { "category": "reference", "author": "Nigel Rees", "title": "Sayings of the Century", "price": 8.95 }, { "category": "fiction", "author": "Evelyn Waugh", "title ...You'll first need to invoke parse_json () on your column (unless it's already typed as dynamic and not as string, in which case you can skip this step). Then you can access the Date property in your JSON value and use todatetime () to cast it to type datetime. Afterwards, you can filter by your external parameter ( dateTimeLowerBound in the ...LINQ to JSON provides a number of methods for getting data from its objects. The index methods on JObject/JArray let you quickly get data by its property name on an object or index in a collection, while Children () lets you get ranges of data as IEnumerable<JToken> to then query using LINQ. Getting values by Property Name or Collection Index.Apr 4, 2023 · Custom Search JSON API provides 100 search queries per day for free. If you need more, you may sign up for billing in the API Console. Additional requests cost $5 per 1000 queries, up to 10k... Search JSON response with python. 0. Python - Searching JSON. 2. Python searching a Json with key value. 0. Searching for a string within JSON list. 0. Searching in a ...May 25, 2018 · I am searching for lucene query to search this JSON message having . orders > 30 and version > 3.4 Any help is appreciated [Updated] I am using logback-elasticsearch-appender to push messages into ElasticSearch using SLF4j. log.info(new org.json.JSONOject(arg).toString()); C# Search in JSON without deserialization. 6. Search for a nested value inside of a JSON.net object in C#. 1. Searching for fields in a Json file in C#. 0.I've got a JSON stream coming back from a server, and I need to search for a specific value of the node "ID" using JSON.net to parse the data. And I can almost make it work, but not quite because the results coming back are deeply nested in each other -- this is due to the fact that I'm getting a folder structure back.Values in JSON have string type whereas in products table they are numbers. MySQL won't convert datatypes for JSON implicitly rather than another datatypes, because " chars in JSON are not only datatype marks but, from MySQL looking point, they are a part of value. So add dquote chars to the value to be searched for.Simple Queries. To support the extraction of values from a JSON structure, a location path syntax is defined. In common with XPath, this will select all possible values in the document that match the specified location path. The two structural constructs of JSON are objects and arrays.json: One per blob (default) Parses JSON blobs as a single chunk of text. Each JSON blob becomes a single search document. jsonArray: Multiple per blob: Parses a JSON array in the blob, where each element of the array becomes a separate search document. jsonLines: Multiple per blobAug 10, 2020 · Search JSON response with python. 0. Python - Searching JSON. 2. Python searching a Json with key value. 0. Searching for a string within JSON list. 0. Searching in a ... The following table describes the functions that are available for you to use to create or manipulate JSON objects: Description. JSON function. Creates a new JSON object from key-value pairs. json_object. Evaluates whether a value can be parsed as JSON. If the value is in a valid JSON format returns the value. May 14, 2021 · Note: We used json.loads() method to convert JSON encoded data into a Python dictionary. After turning JSON data into a dictionary, we can check if a key exists or not. Check if there is a value for a key in JSON. We need a value of the key to be present in JSON so we can use this value in our system. System.Text.Json provides two ways to build a JSON DOM: JsonDocument provides the ability to build a read-only DOM by using Utf8JsonReader. The JSON elements that compose the payload can be accessed via the JsonElement type. The JsonElement type provides array and object enumerators along with APIs to convert JSON text to common .NET types.Dec 29, 2022 · A JSON path that specifies the object or the array to extract. In SQL Server 2017 (14.x) and in Azure SQL Database, you can provide a variable as the value of path. The JSON path can specify lax or strict mode for parsing. If you don't specify the parsing mode, lax mode is the default. For more info, see JSON Path Expressions (SQL Server). Get Started with Elasticsearch. Video. Intro to Kibana. Video. ELK for Logs & Metrics. Description. Returns the path to the given string within a JSON document, or NULL if any of json_doc, search_str or a path argument is NULL; if the search string is not found, or if no path exists within the document. A warning will occur if the JSON document is not valid, any of the path arguments are not valid, if return_arg is neither one ...Using Python’s context manager, you can create a file called data_file.json and open it in write mode. (JSON files conveniently end in a .json extension.) Note that dump () takes two positional arguments: (1) the data object to be serialized, and (2) the file-like object to which the bytes will be written.With the second method, you return only after checking every element of json_object, which is substantial on large lists. I tested it myself, and worst case (search which matches the last element in json_object), the loop takes as long as the comprehension. Best case, where the search matches the first element, outperforms the comprehension ... In the Search flags text field, type JSON viewer. In the JSON Viewer dropdown menu, select Enabled. Click the Restart button which appears in the lower right: View reformatted JSON server responses. To view a JSON response from a web server as reformatted JSON: Open a new tab or window in Microsoft Edge. Type a URL that returns JSON data in the ...You basically treat it as a dictionary, passing the keys to get the values of each nested dictionary. The only different part is when you hit maindata, where the resulting value is a list. In order to handle that, we pull the first element [0] and then access the Info key to get the value TEXT.Azure Cognitive Search can index JSON documents and arrays in Azure Blob Storage using an indexer that knows how to read semi-structured data. Semi-structured data contains tags or markings which separate content within the data. It splits the difference between unstructured data, which must be fully indexed, and formally structured data that ...Jul 29, 2018 · You'll first need to invoke parse_json () on your column (unless it's already typed as dynamic and not as string, in which case you can skip this step). Then you can access the Date property in your JSON value and use todatetime () to cast it to type datetime. Afterwards, you can filter by your external parameter ( dateTimeLowerBound in the ... May 1, 2017 · Go to elasticsearch tutorials (example the shakespeare tutorial) and download the json file sample used and have a look at it. In front of each json object (each individual line) there is an index line. This is what you are looking for after using the jq command. This format is mandatory to use the bulk API, plain json files wont work. Go to elasticsearch tutorials (example the shakespeare tutorial) and download the json file sample used and have a look at it. In front of each json object (each individual line) there is an index line. This is what you are looking for after using the jq command. This format is mandatory to use the bulk API, plain json files wont work.This sample loads JSON and then queries values from it using P:Newtonsoft.Json.Linq.JToken.Item(System.Object) indexer and then casts the returned tokens to .NET values. I am searching for lucene query to search this JSON message having . orders > 30 and version > 3.4 Any help is appreciated [Updated] I am using logback-elasticsearch-appender to push messages into ElasticSearch using SLF4j. log.info(new org.json.JSONOject(arg).toString());You could do this every time you get a new Json, no need to do this with every search. var myArray = []; for (var elementName in data) //We iterate over the Object to get the names of the nested objects myArray.push (data [elementName]); //We get the objects of the json and push them inside our array.Azure Cognitive Search can index JSON documents and arrays in Azure Blob Storage using an indexer that knows how to read semi-structured data. Semi-structured data contains tags or markings which separate content within the data. It splits the difference between unstructured data, which must be fully indexed, and formally structured data that ...Jan 9, 2018 · 3. I have a JSON file that looks like this: I have a list of device ID's, and I'd like to search my JSON for a specific value of the id, to get the name. The data that is now is JSON format used to be in XML format, for which I used to do this: device = xml.find ("devices/device [@id=\'%s\']" %someDeviceID) deviceName = device.attrib ['name ... Dec 30, 2021 · json_search(json_doc,one_or_all,search_str [,escape_char [, path]]) 和json_contains相比，该函数不需要指定具体的path，更像是like一样的模糊查询。如果查询的str存在，则返回具体的path,如果不存在则返回null。 I've got a JSON stream coming back from a server, and I need to search for a specific value of the node "ID" using JSON.net to parse the data. And I can almost make it work, but not quite because the results coming back are deeply nested in each other -- this is due to the fact that I'm getting a folder structure back.Simple Queries. To support the extraction of values from a JSON structure, a location path syntax is defined. In common with XPath, this will select all possible values in the document that match the specified location path. The two structural constructs of JSON are objects and arrays.@dig: Search for a value without providing its entire path. See e8e87f2. Modifier arguments. A modifier may accept an optional argument. The argument can be a valid JSON document or just characters. For example, the @pretty modifier takes a json object as its argument.The following table describes the functions that are available for you to use to create or manipulate JSON objects: Description. JSON function. Creates a new JSON object from key-value pairs. json_object. Evaluates whether a value can be parsed as JSON. If the value is in a valid JSON format returns the value.If I search "cars", it returns 2 results, and the rest of my code won't recognize the objects. (Plus, I know there's more than 2 results for cars). Any idea on how to modify the URL?You basically treat it as a dictionary, passing the keys to get the values of each nested dictionary. The only different part is when you hit maindata, where the resulting value is a list. In order to handle that, we pull the first element [0] and then access the Info key to get the value TEXT.Oct 30, 2022 · I want to use Powershell to recursively search a JSON for a string, and then have it report back the path to the value and what the value was. In this example I want to search the whole JSON for any key that has 'corset' in its value, and then return back that it was found in : Using Python’s context manager, you can create a file called data_file.json and open it in write mode. (JSON files conveniently end in a .json extension.) Note that dump () takes two positional arguments: (1) the data object to be serialized, and (2) the file-like object to which the bytes will be written.For reasons beyond my control, I need to search for the same key value in JSONs with different structures. I a code that is able to find the value of "valor", and no matter what is the structure of the JSON, there always will be a vendor key somewhere inside it. By now I have two examples of JSON that I receive:Feb 5, 2014 · I'm trying to get started with Yammer API. I have been able to go through the oauth process and obtain the token. Now, I just want to perform searches within the current user's account. The Yammer... May 14, 2021 · Note: We used json.loads() method to convert JSON encoded data into a Python dictionary. After turning JSON data into a dictionary, we can check if a key exists or not. Check if there is a value for a key in JSON. We need a value of the key to be present in JSON so we can use this value in our system.

Add JSON documents. After you create an index, Redis Stack automatically indexes any existing, modified, or newly created JSON documents stored in the database. For existing documents, indexing runs asynchronously in the background, so it can take some time before the document is available. Modified and newly created documents are indexed .... Ytx20l bs battery autozone

You can use DefiantJS (http://defiantjs.com) which extends the global object JSON with the method "search". With which you can query XPath queries on JSON structures. Example:You basically treat it as a dictionary, passing the keys to get the values of each nested dictionary. The only different part is when you hit maindata, where the resulting value is a list. In order to handle that, we pull the first element [0] and then access the Info key to get the value TEXT.@Bhawna first you are returning "null" value, in a build method you cannot have any null widget. Then you are making the "contains" check in the build method, which is not clean; the build method should only build the GUI based on some variables to be fast.Area=='" + searchKey + "')] json path expression is selecting the root level nodes using $. and searching for Area under Branches node using (@..Area='Devis') expression. Once an area is matched under the branches node the root level Area node is selected which includes other branch nodes as well. Other option is to explicitly select Branch ...JSON_SEARCH () 根据 one_or_all 参数决定是否返回所有匹配的路径：. 如果是 'one' ， JSON_SEARCH () 函数将返回第一个匹配的路径。. 如果是 'all' ， JSON_SEARCH () 函数将返回所有匹配的路径。. 所有的路径会包装在一个数组内返回。. search_str. 必需的。. 被搜索的字符串。. 您 ...Nov 27, 2016 · Using python to search json for a value. 0. Parsing Json in Python and find a value. 1. Searching for a value in JSON array. 0. In MySQL, the JSON_SEARCH() function returns the path to a given string in a JSON document. You provide the JSON document as an argument to the function. You also provide the argument that determines the actual string to search (including any escape characters), as well as a keyword to indicate whether to return the path of all instances or just one.We are using json module to convert the JSON string to a dictionary. Parsing a List using JSONPath Expression. The JSON key can contain a list of values. We can use JSONPath expression to parse the list and get the list of values. Let’s say we have a JSON file “db.json” with the following contents.Using Python’s context manager, you can create a file called data_file.json and open it in write mode. (JSON files conveniently end in a .json extension.) Note that dump () takes two positional arguments: (1) the data object to be serialized, and (2) the file-like object to which the bytes will be written.Export Search Results. The Search API is a unified search API that returns tickets, users, and organizations. You can define filters to narrow your search results according to resource type, dates, and object properties, such as ticket requester or tag. To search articles in Help Center, see Search in the Help Center API documentation. Here is my JSON String. Now i want to search for name in this JSON and then display the results... javascript; json; Share. Improve this question. FollowArea=='" + searchKey + "')] json path expression is selecting the root level nodes using $. and searching for Area under Branches node using (@..Area='Devis') expression. Once an area is matched under the branches node the root level Area node is selected which includes other branch nodes as well. Other option is to explicitly select Branch ...Now I want to search through the key steamnaam I am currently using this query: SELECT * FROM logs_1 WHERE JSON_CONTAINS (lower (`data`), '"finn"', "$.steamnaam") This does give me the rows that contain finn as a value in the steamname JSON. But now I want to also make it check if it's not exactly the same, but almost the same. Jun 5, 2018 · This week we will take another look at some common data types we might encounter in the real world: JSON data. JSON data is used pretty frequently on the web if you’re hitting APIs. This not only includes external data (twitter, weather, marvel database), but often includes internal data to your company. It’s nice to be able to leverage ... Js Search enables efficient client-side searches of JavaScript and JSON objects. It is ES5 compatible and does not require jQuery or any other third-party libraries. Js Search began as a lightweight implementation of Lunr JS , offering runtime performance improvements and a smaller file size.json: One per blob (default) Parses JSON blobs as a single chunk of text. Each JSON blob becomes a single search document. jsonArray: Multiple per blob: Parses a JSON array in the blob, where each element of the array becomes a separate search document. jsonLines: Multiple per blobI am trying to extract the data from a JSON output obtained from API call using uri module. The data contains some key value pairs. The format is like below item : "name-of-the-item" &quo...A JSON database like MongoDB stores the data in a JSON-like format ( binary JSON ), which is the binary encoded version of JSON, and is optimized for performance and space. This makes the MongoDB database the best natural fit for storing JSON data. You can store details of an entire object in one document, making it easier to view and query. Nov 27, 2016 · Using python to search json for a value. 0. Parsing Json in Python and find a value. 1. Searching for a value in JSON array. 0. .

.search.json - json_search(json_doc,one_or_all,search_str [,escape_char [, path]]) 和json_contains相比，该函数不需要指定具体的path，更像是like一样的模糊查询。如果查询的str存在，则返回具体的path,如果不存在则返回null。

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.search.json - json_search(json_doc,one_or_all,search_str [,escape_char [, path]]) 和json_contains相比，该函数不需要指定具体的path，更像是like一样的模糊查询。 如果查询的str存在，则返回具体的path,如果不存在则返回null。

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.search.json - json_search(json_doc,one_or_all,search_str [,escape_char [, path]]) 和json_contains相比，该函数不需要指定具体的path，更像是like一样的模糊查询。如果查询的str存在，则返回具体的path,如果不存在则返回null。