Question

使用Perl DBI，如何检查DB表的给定列是否未签名？

以下代码无法按预期工作（使用MySQL DB）：

import sympy as sp
import numpy as np
import matplotlib.pyplot as plt

XMIN, XMAX, DATAPOINTS = -3., 3., 100

# get a recognizable equation (in terms of x)
x = sp.Symbol('x')
while True:
    try:
        s = input("Enter a function: Y(x) = ") 
        y = sp.sympify(s)
        break
    except sp.SympifyError as se:
        print(se)

# generate points to plot        
xs = np.linspace(XMIN, XMAX, DATAPOINTS)
ys = [y.evalf(subs={"x":xval}) for xval in xs]

# plot points
plt.plot(xs, ys, 'bo')
plt.show()

Answer 1

如果该界面中没有任何原生内容，希望您可以使用DBI解决此问题：

$('span[id^="init-like"]').click ->
  if $(this).html() == "true"
    $(this).parent().find('span[id^="like-click"]').hide()
  else
    $(this).parent().find('span[id^="unlike-click"]').hide()
$('span[id^="init-like"]').click()

DB列是UNSIGNED吗？

1 个答案: