function

问题 I have function that will return all of rows, but I expect 0 or 1 because Sid is unique: CREATE DEFINER=`root`@`localhost` FUNCTION `IsInDatabase`(sId VARCHAR(21)) RETURNS tinyint(1) BEGIN RETURN (SELECT COUNT(Id) FROM table WHERE SId =sid); END When executed directly, SELECT COUNT(Id) FROM table WHERE SId ='87882118' will return exactly what I need: '1' or '0'. Why is my function not working properly ? 回答1: It's because MySQL is not case sensitive and so SId and sid are the same name, and it

问题 I have function that will return all of rows, but I expect 0 or 1 because Sid is unique: CREATE DEFINER=`root`@`localhost` FUNCTION `IsInDatabase`(sId VARCHAR(21)) RETURNS tinyint(1) BEGIN RETURN (SELECT COUNT(Id) FROM table WHERE SId =sid); END When executed directly, SELECT COUNT(Id) FROM table WHERE SId ='87882118' will return exactly what I need: '1' or '0'. Why is my function not working properly ? 回答1: It's because MySQL is not case sensitive and so SId and sid are the same name, and it

问题 I need a Google AdWords conversion script to work whenever someone submits a form for a free quote. Google has provided the script which I'm put into a Snippet with WordPress and activated it for the site. I now need to call that function when the submit button is pressed, but I can't remember the correct syntax and Google searches so far have led me down long paths of .php file creations that isn't answering what feels like a simple solution would solve. Currently I have added the function

问题 I have a functionA which accepts a function as a parameter. I want to manipulate the arguments of that function in functionA and return this as functionC. I found that I can do this with .apply(), however the original context of functionB is lost and instead replaced by functionA. For example, var factory = { return { fnB: function() {} } }; fnA(fn) { return fnC(params) { var customparams = [params, {something: else}] return method.apply(null, customparams); } } var load = fnA(factory.fnB);

问题 Suppose we have 3 list s of data.frame s. In BASE R, I was wondering how I could automatically (ex. in a looping structure) rbind the data.frame s within these 3 lists? Please note I want the looping structure so it can rbind any more number of similar lists (ex. g4 g5 ...) g1 <- list(b1 = list(data.frame(a = 1:3, b = 3:5))) g2 <- list(b1 = list(data.frame(a = 1:3, b = 3:5))) g3 <- list(b1 = list(data.frame(a = 1:3, b = 3:5))) 回答1: Here is an option with base R do.call(rbind, lapply(mget(ls

问题 Suppose we have 3 list s of data.frame s. In BASE R, I was wondering how I could automatically (ex. in a looping structure) rbind the data.frame s within these 3 lists? Please note I want the looping structure so it can rbind any more number of similar lists (ex. g4 g5 ...) g1 <- list(b1 = list(data.frame(a = 1:3, b = 3:5))) g2 <- list(b1 = list(data.frame(a = 1:3, b = 3:5))) g3 <- list(b1 = list(data.frame(a = 1:3, b = 3:5))) 回答1: Here is an option with base R do.call(rbind, lapply(mget(ls

问题 I'm new at Postgresql and do not exactly know how to manage partition tables. I have partition table based on day. Before inserting data, trigger checks date and put into corresponding child table. eg. 11.15.2014 - insert into table named 11-15-2014_log. 11.16.2014 - insert into table named 11-16-2014_log. Now I want to create function that will drop old child tables, for example, tables older than 90 days. Should I find and drop child table according its tablename (cause it consists date of

问题 I need to check if a website is online and to get ping time. I already have a rough ping time (close enough). But I still need to check if the site is online and make the function run five times, and get the lowest ping value (in order to get it more accurate). My code so far: <script> function initPingTest(siteUrl){ pingTester(); function pingTester(){ document.getElementById('site').innerHTML = '<center>' + siteUrl + '</center>'; document.getElementById('pingT').innerHTML = '<center>

问题 I wish to use a recursive structure in my dplyr change that iterates on the number of lags used on certain operations. The thing is that I am not sure how to set its ending point since it resembles more a while than a for loop, which makes me a bit insecure. Here is some sample data. Groups are not necessarily the same size and are indexed by id df <- data.frame(id = c(1, 1, 1, 1, 2, 2, 3, 4, 5, 5, 5), p201 = c(NA, NA, "001", NA, NA, NA, "001", "001", "001", NA, NA), V2009 = c(25, 11, 63, 75,

问题 I'm using React.js. I want to use the data I have captured in Mock Api in product detail in an e-commerce site, but I get the following error. My goal here is to extract and print data from Mock API in ProductDetail. ProducDetail.js; const ProductDetail = (props) => { const { name, description, price } = props; const axios = require('axios'); const [dress, setDress] = useState([]); useEffect(() => { axios .get(`{url}`) .then(function (response) { setDress(response.data.dress); }) .catch