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问题 Since, cassandra supports map type. I want to insert a python dict into cassandra. I tried this: cql = "Insert into table_name (my_key, name, my_dict) values (%s, %s, %s)" % (my_key, name, my_dict) session.execute(cql) This obviously didn't work. I already have a map type column in my column family. How do I go about it? Error: TypeError: not all arguments converted during string formatting 回答1: Use parameter passing form instead of string interpolation: cql = "Insert into table_name (my_key,

问题 I am battling this DropDownItem box error, everything seems to work, but pops up the yellow out of bounds while it loads. Tried several things and can not get it resolved. I have this code for my Widget . @override Widget build(BuildContext context) { var _children = <Widget>[ !_createNew ? _referrerPractice() : _referrerCreate(), ]; return new Scaffold( appBar: new AppBar( title: new Text(widget.title), ), body: new Column( mainAxisSize: MainAxisSize.max, children: _children, )); } I then

问题 I've just deployed my app to DigitalOcean using (Managed Database) and I'm getting the following error when calling php artisan migrate SQLSTATE[HY000]: General error: 3750 Unable to create or change a table without a primary key, when the system variable 'sql_require_primary_key' is set. Add a primary key to the table or unset this variable to avoid this message. Note that tables without a primary key can cause performance problems in row-based replication, so please consult your DBA before

问题 I'm sure this must be simple, but I can't figure out how to word it correctly in Google... I have a config which has a field: TimeToPoll="1d" Now I want to do something like : TimeSpan.Parse(TimeToPoll); Returning a timespan of one day. In C# EDIT: I'm looking for a method which allows parse of "1d" as well as "1s" or "1y" etc. Is this possible? Meaning: "1d" parses to {1.00:00:00} "1h" parses to {0.01:00:00} "1m" parses to {0.00:01:00} "1s" parses to {0.00:00:01} 回答1: The d is not needed and

问题 I am battling this DropDownItem box error, everything seems to work, but pops up the yellow out of bounds while it loads. Tried several things and can not get it resolved. I have this code for my Widget . @override Widget build(BuildContext context) { var _children = <Widget>[ !_createNew ? _referrerPractice() : _referrerCreate(), ]; return new Scaffold( appBar: new AppBar( title: new Text(widget.title), ), body: new Column( mainAxisSize: MainAxisSize.max, children: _children, )); } I then

问题 I'm trying to react-native run-android there is this problem?? Could not resolve all files for configuration ':react-native-screens:debugCompileClasspath'. Could not find swiperefreshlayout.jar (androidx.swiperefreshlayout:swiperefreshlayout:1.0.0) 回答1: i fix it by change this for Navigation x5: androidx.swiperefreshlayout:swiperefreshlayout:1.0.0 GO to .\node_modules\react-native-screens\android\build.gradel change the version of implementation 'androidx.swiperefreshlayout:swiperefreshlayout

问题 Since, cassandra supports map type. I want to insert a python dict into cassandra. I tried this: cql = "Insert into table_name (my_key, name, my_dict) values (%s, %s, %s)" % (my_key, name, my_dict) session.execute(cql) This obviously didn't work. I already have a map type column in my column family. How do I go about it? Error: TypeError: not all arguments converted during string formatting 回答1: Use parameter passing form instead of string interpolation: cql = "Insert into table_name (my_key,

问题 I'm making an application in which you edit a file, and it should append the edited file to zip archive and make it downloadable. It should be cross platform (Windows and Linux). My goal is to programmatically generate the edited file and append it to static archive (which is always the same, around 3-4MBs, but around 40-50 files). I've looked at the following post on how to zip archives in node.js, however the answer by Eliseo Soto is OS dependent. I've also found daraosn/node-zip, but as I

问题 Is it considered a good practice to call an Async method that does some heavy lifting with server connections and data exchange during OnStart() event of the application given that this method does not touch the UI thread? Are all the components of the application properly initialized at the time of this event firing for the Async method to be able to execute? protected override async void OnStart() { sendHttpRequestAsync(); } private async void sendHttpRequestAsync() { await ... } 回答1: Avoid

问题 Scenario I'm building an iOS application in Swift. One feature is to have a live video feed as the application background. The video feed is originating from a Raspberry Pi on a local network using sudo motion . Motion is successfully hosting the feed on default port 8081 . The Swift app has a WKWebView object with the source pointing to my Raspberry Pi's motion port. Suspected Issue The webpage at port 8081 is constantly refreshing to load the most recent frame from the camera. Problem When