conditional-statements | 易学教程

Using conditional statements inside 'expect'

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问题 I need to automate logging into a TELNET session using expect , but I need to take care of multiple passwords for the same username. Here's the flow I need to create: Open TELNET session to an IP Send user-name Send password Wrong password? Send the same user-name again, then a different password Should have successfully logged-in at this point... For what it's worth, here's what I've got so far: #!/usr/bin/expect spawn telnet 192.168.40.100 expect "login:" send "spongebob\r" expect "password

Using conditional statements inside 'expect'

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IN Clause with NULL or IS NULL

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问题 Postgres is the database Can I use a NULL value for a IN clause? example: SELECT * FROM tbl_name WHERE id_field IN ('value1', 'value2', 'value3', NULL) I want to limit to these four values. I have tried the above statement and it doesn't work, well it executes but doesn't add the records with NULL id_fields. I have also tried to add a OR condition but this just make the query run and run with no end in sight. SELECT * FROM tbl_name WHERE other_condition = bar AND another_condition = foo AND

How do I test if a variable does not equal either of two values?

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问题 I want to write an if/else statement that tests if the value of a text input does NOT equal either one of two different values. Like this (excuse my pseudo-English code): var test = $("#test").val(); if (test does not equal A or B){ do stuff; } else { do other stuff; } How do I write the condition for the if statement on line 2? 回答1: Think of ! (negation operator) as "not", || (boolean-or operator) as "or" and && (boolean-and operator) as "and". See Operators and Operator Precedence. Thus: if

How to create a new variable with values from different variables if another variable equals a set value in R?

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问题 I have a complicated question that I will try to simplify by simplifying my dataset. Say I have 5 variables: df$Id <- c(1:12) df$Date <- c(NA,NA,a,a,b,NA,NA,b,c,c,b,a) df$va <- c(1.1, 1.4, 2.5, ...) #12 randoms values df$vb <- c(5.9, 2.3, 4.7, ...) #12 other random values df$vc <- c(3.0, 3.3, 3.7, ...) #12 more random values Then I want to create a new variable that takes the value from va, vb, or vc if the date is equal to a, b, or c. I had tried a nested if-else, which did not work. I also

How to do a condition displaying input type based on table column in PHP/Javascript/Mysql?

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问题 This is my database table. I'm currently displaying option1-10 as text but I want to display it as an input type for each option depending if its answer_type column is radiobutton or checkbox. It also shouldn't display when the value of option1-10 is null. Also how do i group it into one like for example if it's a radiobutton, i should only be able to choose one? Here's my code of displaying the text ajax <html> <head> <script> function showUser(str) { if (str == "") { document.getElementById

How to do a condition displaying input type based on table column in PHP/Javascript/Mysql?

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FInd nearest value within list condition

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问题 I want to find nearest value of a cell but don't know how. In my excel sheet cell B1 has a value(LIST NAME) and cell B2 has other value which is to be searched with condition. If cell B1 has value GP_42(list name) then search the value of cell B2 withing list GP_42 (D4:D13) If cell B1 has value GP_42(list name) then se[![enter image description here][2]][2]arch the value of cell B2 withing list GP_42 (E4:E13). If value doesn't match then result should be the nearest matched value. Result

SQL query based on subquery. Retrieve transactions with data > threshold

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问题 My db table is called transactions and is like this: Name | Date (DateTime) | Type | Stock | Volume | Price | Total Tom 2014-05-24 12:00:00 Sell Barclays 100 2.2 220.0 Bob 2014-04-13 15:00:00 Buy Coca-Cola 10 12.0 120.0 varchar DateTime varchar varchar int float float My initial problem was to remove from the table ALL the transactions that belong to a user whose first transaction is later than a certain threshold. My query was: DELETE FROM transactions WHERE name NOT IN (SELECT name FROM

Maya (Python): Running condition command and scriptJob command from within a module

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问题 I'm creating a UI tool that loads during Maya's startup, and executes some modules AFTER VRay has initialized (otherwise an error is thrown). A suggestion from my broader question here has lead me to try out the condition and scriptJob commands. The listener.py code below works when run from within Maya's script editor, but when I import the listener module and run it using the launcher.py code, I get this error: Error: line 1: name 'is_vray_loaded' is not defined Traceback: (most recent call