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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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If you want to let PostgreSQL generate the index name, use ALTER TABLE tablename ADD UNIQUE (columns);. (Note that the CONSTRAINT keyword must be omitted.)
– jpmc26
Nov 26 '14 at 1:41
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Removing Java 8 JDK from Mac
...atest from Oracle (http://www.oracle.com/technetwork/java/javase/downloads/index.html) and install it.
2) Remove (using rm - if you've got backups, you can revert if you make a mistake) all the JDK6 and JRE6 files.
At this stage, you should see:
% ls /Library/Java/JavaVirtualMachines/
jdk1.7.0_nn...
DynamoDB vs MongoDB NoSQL [closed]
... has more features, it doesn't. Mongo has a better query language, you can index within a structure, there's lots of little things. The superiority of Dynamo is in what the OP stated in his comment: it's easy. You don't have to take care of any servers. When you start to set up a Mongo sharded solut...
Is there a vim command to relocate a tab?
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You can relocate a tab with :tabm using either relative or zero-index absolute arguments.
absolute:
Move tab to position i: :tabm i
relative:
Move tab i positions to the right: :tabm +i
Move tab i positions to the left: :tabm -i
It's a relatively new feature. So if it doesn't wo...
jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
...ommand line useful in tracking down the offending jar file. it creates an index of all the class files in all the jars in the folder. Execute from within the lib folder of your deployed app, then search the index.txt file for the offending class.
for /r %X in (*.jar) do (echo %X & jar -tf %X)...
Get boolean from database using Android and SQLite
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It is:
boolean value = cursor.getInt(boolean_column_index) > 0;
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Using scanner.nextLine() [duplicate]
...;
scanner.useDelimiter("\\n");
System.out.print("Enter an index: ");
int index = scanner.nextInt();
System.out.print("Enter a sentence: ");
String sentence = scanner.next();
System.out.println("\nYour sentence: " + sentence);
System.out.prin...
半个汉字的校验与处理(C++) - C/C++ - 清泛网 - 专注C/C++及内核技术
... size = nMaxLen;
bFlag = true;
}
int index = 0; int mid = 0;
for (int i = size - 1; i >= 0; i--)
{
mid = i;
if (!(strSrc[i] & 0x80)) // 找到非汉字的话,立刻停止搜索
{
break;
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std::string的截取字符串的方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...例如截取ip:port，代码如下：std::string ip("127.0.0.1:8888");int index = ip.find_last_of(':'); ipip.substr(0, index)....例如截取ip:port，代码如下：
std::string ip("127.0.0.1:8888");
int index = ip.find_last_of(':');
//ip
ip.substr(0, index).c_str();
//port
ip.substr(index...
怎样用SendMessage发送LVN_COLUMNCLICK消息？ - C/C++ - 清泛网 - 专注C/C++及内核技术
...);部分代码示例如下：BOOL ClickListColumn(CListCtrl& listCtrl, int index){ ...SendMessage(WM_NOTIFY, CtrlID, NM_LISTVIEW);
部分代码示例如下：
BOOL ClickListColumn(CListCtrl& listCtrl, int index)
{
if(index >= listCtrl.GetHeaderCtrl()->GetItemCount())
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