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...应表达式 a ^ b
__unm(a) 对应表达式 -a
__concat(a, b) 对应表达式 a .. b
__len(a) 对应表达式 #a
__eq(a, b) 对应表达式 a == b
__lt(a, b) 对应表达式 a < b
__le(a, b...
Received an invalid column length from the bcp client for colid 6
...
Specifically, if you have any columns that are VARCHAR smaller than 4, watch out for NULL in your data getting misinterpreted as the 4char string "NULL"
– CrazyPyro
Feb 11 at 8:13
...
Stop Excel from automatically converting certain text values to dates
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In my MySQL query (for CSV output through PHP), I used CONCAT('\t', column_name). Also did the trick. Thanks!
– Just Plain High
Jun 24 '16 at 14:39
1
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Is there a splice method for strings?
...y case im working on a dynamic string so i need to specify indices and not character value .
– ProllyGeek
Dec 28 '13 at 18:11
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Convert pandas dataframe to NumPy array
...early the same (actually, using rec.fromrecords is a bit faster).
df2 = pd.concat([df] * 10000)
%timeit df2.to_records()
%%timeit
v = df2.reset_index()
np.rec.fromrecords(v, names=v.columns.tolist())
11.1 ms ± 557 µs per loop (mean ± std. dev. of 7 runs, 100 loops each)
9.67 ms ± 126 µs per l...
What is the difference between LL and LR parsing?
...o parsing algorithms you mentioned (LL and LR) are known to have different characteristics. LL parsers tend to be easier to write by hand, but they are less powerful than LR parsers and accept a much smaller set of grammars than LR parsers do. LR parsers come in many flavors (LR(0), SLR(1), LALR(1...
Java Reflection: How to get the name of a variable?
...UE
public static final java.lang.Class java.lang.Integer.TYPE
static final char[] java.lang.Integer.digits
static final char[] java.lang.Integer.DigitTens
static final char[] java.lang.Integer.DigitOnes
static final int[] java.lang.Integer.sizeTable
private static java.lang.String java.lang.Integer....
How to disallow temporaries
...
How about a little hack
class Foo
{
public:
Foo (const char*) {}
};
void Foo (float);
int main ()
{
Foo ("hello"); // error
class Foo a("hi"); // OK
return 1;
}
share
|
...
Creating C macro with ## and __LINE__ (token concatenation with positioning macro)
...or is expected to for decades. The prime example is compiling X11, macro "Concat3" is broken, it's result is now MISNAMED C Identifier, which of course fails to build. and i'm beginning to thing build fails are their profession.
I think the answer here is "new C that breaks standards is bad C", t...
SQL Server 2008: How to query all databases sizes?
...BASES-IN-0337f6d5#content
DECLARE @spacetable table
(
database_name varchar(50) ,
total_size_data int,
space_util_data int,
space_data_left int,
percent_fill_data float,
total_size_data_log int,
space_util_log int,
space_log_left int,
percent_fill_log char(50),
[total db size] int,
[to...