大约有 15,564 项符合查询结果（耗时：0.0244秒） [XML]
Migration: Cannot add foreign key constraint
... however when I migrate my table using artisan i am thrown the following error:
33 Answers
...
Does MySQL foreign_key_checks affect the entire database?
...foreign key (FK) while FOREIGN_KEY_CHECKS are ON, then Mysql will raise an error and refuse to add the FK, because of the broken reference. When you add the foreign key while FOREIGN_KEY_CHECKS are OFF, mysql continues without error. Even when you enable the checks afterwards, there will be no erro...
Mongod complains that there is no /data/db folder
...ify the db-path manually. I wouldn't recommend doing that.
Edit:
the error message you're getting is "Unable to create/open lock file: /data/db/mongod.lock errno:13 Permission denied". The directory you created doesn't seem to have the correct permissions and ownership --
it needs to be writa...
Unioning two tables with different number of columns
...nd followed above answer. But mismatch in the Order of data type caused an error. The below description from another answer will come handy.
Are the results above the same as the sequence of columns in your table? because oracle is strict in column orders. this example below produces an error:
cre...
Web API Put Request generates an Http 405 Method Not Allowed error
Here's the call to the PUT method on my Web API - the third line in the method (I am calling the Web API from an ASP.NET MVC front end):
...
Assigning code to a variable
...lts results = provider.CompileAssemblyFromSource(parameters, code);
Check errors:
if (results.Errors.HasErrors)
{
StringBuilder sb = new StringBuilder();
foreach (CompilerError error in results.Errors)
{
sb.AppendLine(String.Format("Error ({0}): {1}", erro...
Why can I change value of a constant in javascript
... // ['foo2']
but neither of these:
const x = {};
x = {foo: 'bar'}; // error - re-assigning
const y = ['foo'];
const y = ['bar']; // error - re-declaring
const foo = 'bar';
foo = 'bar2'; // error - can not re-assign
var foo = 'bar3'; // error - already declared
function foo() {}; // ...
How to Get the Title of a HTML Page Displayed in UIWebView?
...RL URLWithString:@"http://www.appcoda.com"] encoding:NSASCIIStringEncoding error:nil];
NSString * start = @"<title>";
NSRange range1 = [htmlCode rangeOfString:start];
NSString * end = @"</title>";
NSRange range2 = [htmlCode rangeOfString:end];
NSString * subString = [htmlCode substring...
iOS开发过程中的各种tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Request requestWithURL:[NSURL URLWithString:@"http://www.baidu.com"]]];
NSError *error;
NSString *errorString = [NSString stringWithFormat:@"<html><center><font size=+5 color='red'>AnError Occurred;<br>%@</font></center></html>",error];
[myWebView loadHTMLString:errorString baseURL:nil];
//页...
Unable to launch the IIS Express Web server, Failed to register URL, Access is denied
...
I solved the error by changing the port for the project.
I did the following steps:
1 - Right click on the project.
2 - Go to properties.
3 - Go to Server tab.
4 - On tab section, change the project URL for other port, like 8080 or 300...