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How to get the insert ID in JDBC?
...llstmt = null;
callstmt = con.prepareCall("INSERT INTO myIdentTable (col2) VALUES (?);SELECT @@IDENTITY");
callstmt.setString(1, "testInputBatch");
System.out.println("Batch statement successfully executed");
callstmt.execute();
int iUpd...
Network usage top/htop on Linux
...U usage. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. Handy for answering the question "why is our ADSL link so slow?"...
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What is a segmentation fault?
...n (process) memory in improper way (for instance trying to write to non-writable space). But the most common reason for it is the access to the part of the virtual address space that is not mapped to physical one at all.
And all of this with respect to virtual memory systems.
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How do I get the name of a Ruby class?
...ke Module1::class_name. But if we only want class_name, use
result.class.table_name.singularize
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How to convert boost path type to string?
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@MarcoAlka See the linked table boost.org/doc/libs/1_48_0/libs/filesystem/v3/doc/… and note the second line: class path canonize() Function removed - that means it was once in the library but no longer--the definition of deprecated.
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Do you use NULL or 0 (zero) for pointers in C++?
...ger. In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days.
If you have to name the null pointer, call it nullptr; that's what it's called in C++11. Then, nullptr will be a keyword.
That said, don't sweat the s...
PL/SQL, how to escape single quote in a string?
...ting data.
Here's a very quick example:
Lets say we have a very simple table, Customers, that has 2 columns, FirstName and LastName. We need to move the data into Customers2, so we need to generate a bunch of INSERT statements.
Select 'INSERT INTO Customers2 (FirstName, LastName) ' ||
'...
When would you use delegates in C#? [closed]
... is extremely handy (although the example is a little contrived).
string sTableName = "test";
string sQuery = "SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='" + sTableName + "'";
DataProvider.UseReader( sQuery,
delegate( System.Data.IDataReader reader )
{
Con...
INSERT … ON DUPLICATE KEY (do nothing)
I have a table with a unique key for two columns:
3 Answers
3
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Backwards migration with Django South
...ur_app, South runs all new migrations, in order. (It looks at the database tables to decide which ones are 'new').
However, you can also specify any migration by number, and South will migrate your database, either forward or backward, to take it to that point. So, with the example files above, if ...