RoR/SQL新手在这里.
我的日期时间列' deleted_at'都未初始化.运行此查询会返回错误:
SELECT * FROM variants v
ON v.id = ovv0.variant_id INNER JOIN option_values_variants ovv1
ON v.id = ovv1.variant_id INNER JOIN option_values_variants ovv2
ON v.id = ovv2.variant_id INNER JOIN option_values_variants ovv3
ON v.id = ovv3.variant_id INNER JOIN option_values_variants ovv4
ON v.id = ovv4.variant_id
WHERE v.deleted_at = NULL
AND v.product_id = 1060500595
但是,如果我将我的日期时间值设置为0,并将我的查询设置为v.deleted_at = 0,则会向我返回正确的变体.
如何检查未初始化/ NULL日期时间？
我正在尝试对我的应用程序进行多线程处理，以便它在执行进程时可见，这就是我到目前为止所拥有的：
Private Sub SendPOST(ByVal URL As String)
Try
Dim DataBytes As Byte() = Encoding.ASCII.GetBytes("")
Dim Request As HttpWebRequest = TryCast(WebRequest.Create(URL.Trim & "/webdav/"), HttpWebRequest)
Request.Method = "POST"
Request.ContentType = "application/x-www-form-urlencoded"
Request.ContentLength = DataBytes.Length
Request.Timeout = 1000
Request.ReadWriteTimeout = 1000
Dim PostData As Stream = Request.GetRequestStream()
PostData.Write(DataBytes, 0, DataBytes.Length)
Dim Response As WebResponse = Request.GetResponse()
Dim ResponseStream As Stream = Response.GetResponseStream()
Dim StreamReader As New IO.StreamReader(ResponseStream)
Dim Text As String = StreamReader.ReadToEnd()
PostData.Close()
Catch ex As Exception
If ex.ToString.Contains("401") Then
TextBox2.Text = …嗨,
如何按值(而非id)查找隐藏字段？我知道我可以通过以下方式获得价值:
$('#MyHiddenField').val();
但在这种情况下,我需要通过val找到该字段然后清除它.
请帮助!
每当我尝试将我的程序部署到谷歌应用程序引擎时,它会向我显示此错误,我用谷歌搜索它并且没有收到任何好的答案.有人可以告诉我这个错误是什么以及如何解决它.
编译模块com.romero.chapthree.GAEJChapThree [ERROR] com.google.gwt.dev上的com.google.gwt.dev.javac.JdtCompiler.getCompilerOptions(JdtCompiler.java:340)中的意外java.lang.NoSuchFieldError:warningThreshold. javac.JdtCompiler $ CompilerImpl.(JdtCompiler.java:174)com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:616)com.google.gwt.dev.javac.CompilationStateBuilder $ CompileMoreLater.compile (CompilationStateBuilder.java:193)com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:390)com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:275)at at Com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:299)位于com.google.gwt.dev.Precompile.precompile(Precompile.java:529)com.google.gwt.dev.Precompile. com.google.gwt.dev.Compiler.run(Compiler.java:205)com.google.gwt.dev.Compiler.run(Compiler.java:177)上的com.google预编译(Precompile.java:466) .gwt.dev.Compiler $ 1.run (Compiler.java:149)位于com.google的com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:87)com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:81). gwt.dev.Compiler.main(Compiler.java:156)
有没有办法使用curl这样你可以做一些与php中的get_meta_tags()函数相同的东西？特别是在php中使用curl以尽可能少的开销来获取外部站点的元标记
我想保存一个chessGameplay的状态.
private void saveToolStripMenuItem_Click(object sender, EventArgs e)// menu strip control
{
saveFileDialog1.InitialDirectory = @"c:\";
DialogResult result= saveFileDialog1.ShowDialog();
if (result == DialogResult.OK)
{
saveToFile(saveFileDialog1.FileName);
}
}
private void loadToolStripMenuItem_Click(object sender, EventArgs e)
{
openFileDialog1.InitialDirectory = @"c:\";
DialogResult result= openFileDialog1.ShowDialog();
if (result == DialogResult.OK)
{
openFile(openFileDialog1.FileName);
}
}
GameSave game2 = new GameSave();
public void saveToFile(string s)
{
game2.setLoadedPieces(codeFile.PieceState());// will pass the current pieces state. that is an array of all the chess pieces objects..which determine where each piece is on the …我得到的负载错误的这个时候我编译.如果我解决其中一个问题,希望事情会变得更加清晰(如果没有,我可以发布其余部分):
'Weapon' : illegal member initialization: 'Name' is not a base or member
它具有名称和成本.武器继承Shopable,Shopable在其受保护的部分中具有名称,成本和描述.
Shopable.h:
#ifndef _SHOPABLE_H_
#define _SHOPABLE_H_
#include "Library.h"
class Shopable{
protected:
std::string Name;
int Cost;
std::string Description;
public:
std::string getName() const{return Name;}
int getCost() const {return Cost;}
virtual std::string getDesc() const = 0;
};
#endif
Weapon.h:
#ifndef _WEAPON_H_
#define _WEAPON_H_
#include "Shopable.h"
class Weapon : public Shopable{
private:
int Damage;
public:
Weapon(int c,int d,std::string n) : Cost(c), Damage(d), Name(n){}
std::string getDesc() const{
return getName()+"\t"+tostring(Damage)+"\t"+tostring(Cost);
} …我正在尝试在MySQL中创建一个准备好的语句,它接受一个参数.当我在命令行上尝试此操作时,我收到语法错误.但是,当我准备好的声明中没有变量时,我能够很好地创建它们.下面是我在MySQL命令提示符下看到的复制和粘贴:
mysql> PREPARE state_name FROM "select * from ? limit 1";
错误1064(42000):您的SQL语法有错误; 检查与您的MySQL服务器版本对应的手册,以便在'附近使用正确的语法？在第1行限制1'
mysql> PREPARE state_name FROM "select * from documents limit 1";
Query OK, 0 rows affected (0.00 sec) Statement prepared
我正在使用的MySQL版本是5.0.77-log.
我没有看到语法错误吗？是否有任何配置参数我必须设置,以使准备好的语句工作？
我已经为我的页面添加了元刷新,但根本没有任何反应.我正在使用
<meta http-equiv="refesh" content="0;URL=http://buzztard.org/"/>
我也在Google Chrome中.
我想知道我应该通过执行Wiki中提到的以下命令在CentOS 5/cPanel服务器上安装node.js的目录:
git clone --depth 1 https://github.com/joyent/node.git
cd node
git checkout origin/v0.4 # optional. Note that master is unstable.
export JOBS=2 # optional, sets number of parallel commands.
mkdir ~/local
./configure --prefix=$HOME/local/node
make
make install
echo 'export PATH=$HOME/local/node/bin:$PATH' >> ~/.profile
source ~/.profile
请指教.