I've called my SQL query like so (ommited error checking for post)
PGresult *result = PQexec(self.connection, "SELECT * FROM \"getNewPaths\"()");
const int numRows = PQntuples(result);
int row = 0;
for (int i = 0; i < numRows; i++) {
char *path = PQgetvalue(result, row, 0);
As soon as I hit the PQgetvalue call I get the exception. If I run that same SQL command inside of psql I do get back exactly what I'd expect to see. The getNewPaths() function has a return type of: TABLE(fullpath varchar, uuid uuid)
Since I'm asking for the first column of the first row, I'm not sure why I'm getting this error.
My mac PostgreSQL server is running 9.2.1, and my client is running 9.1.5
Just figured this out. A macro was calling PQclear(result) before I was actually using the results. Removing that fixed the problem.
Related
I currently try to filter calls to a function by command. I try to do so with the following code where ##REPLACE_comm## is replaced by python by the command name. The double backslash are cause I am using bcc. The following code throws an error when loading:
if(1){
char filter[TASK_COMM_LEN] = "##REPLACE_comm##";
char command[TASK_COMM_LEN];
bpf_get_current_comm(&command, sizeof(command));
for(u16 i = 0; i<=TASK_COMM_LEN; i++){
if(command[i] == '\\0' && filter[i] == '\\0'){
break;
}
if(command[i] == filter[i]){
continue;
}
return 0;
}
}
The error is:
unknown opcode 70
HINT: The 'unknown opcode' can happen if you reference a global or static variable, or data in read-only section. For example, 'char *p = "hello"' will result in p referencing a read-only section, and 'char p[] = "hello"' will have "hello" stored on the stack.
I feel like I already made sure the variables are on the stack by allocating space and not just having a pointer but it doesnt work. What am I missing?
I wrote the code to update my table (SecurityQuestionAnswer) with new security password questions and move to old questions to another table (SecurityQuestionAnswersArchives). Total no of security questions is 3. I am able to update the current table, but when I add the same rows to history table, it shows weird data: only two records are added instead of 3 and the data is also duplicated. My code is as follows:
if (oldQuestions.Any())
{
var oldquestionstoarchivelist = new List<SecurityQuestionAnswersArchives>();
var oldquestionstoarchive =new SecurityQuestionAnswersArchives();
for (int i = 0; i < 3; i++)
{
oldquestionstoarchive.Id = oldQuestions[i].Id;
oldquestionstoarchive.SecurityQuestionId = oldQuestions[i].SecurityQuestionId;
oldquestionstoarchive.Answer = oldQuestions[i].Answer;
oldquestionstoarchive.UpdateDate = oldQuestions[i].UpdateDate;
oldquestionstoarchive.IpAddress = oldQuestions[i].IpAddress;
oldquestionstoarchive.SecurityQuestion = oldQuestions[i].SecurityQuestion;
oldquestionstoarchive.User = oldQuestions[i].User;
oldquestionstoarchivelist.Add(oldquestionstoarchive);
}
user.SecurityQuestionAnswersArchives = oldquestionstoarchivelist;
//await Store.UpdateAsync(user);
_dbContext.ArchiveSecurityQuestionAnswers.AddRange(oldquestionstoarchivelist);
_dbContext.SecurityQuestionAnswers.RemoveRange(oldQuestions);
await _dbContext.SaveChangesAsync();
oldquestionstoarchivelist.Clear();
}
UPDATE 1
The loop looks fine, It iterates three times(0,1,2), which is expected. First issue is with AddRange function to which I was passing a list , but it takes an IEnumerable input, I rectified it using following code.
IEnumerable<SecurityQuestionAnswersArchives> finalArchiveses = oldquestionstoarchivelist;
_dbContext.ArchiveSecurityQuestionAnswers.AddRange(finalArchiveses);
The other issue is duplicate data , which I am unable to figure out where the issue is. Please help me in finding this out.
Your help is much appreciated !
Got it ! Just sharing in case anybody has same issue.
The problem was with initialization at wrong place. I moved
var oldquestionstoarchive =new SecurityQuestionAnswersArchives();
in side the Forloop, now the variable will hold the unique values over each iteration.
var oldquestionstoarchivelist = new List<SecurityQuestionAnswersArchives>();
for (int i = 0; i < 3; i++)
{
var oldquestionstoarchive = new SecurityQuestionAnswersArchives();
oldquestionstoarchive.SecurityQuestionId = oldQuestions[i].SecurityQuestionId;
oldquestionstoarchive.Answer = oldQuestions[i].Answer;
oldquestionstoarchive.UpdateDate = oldQuestions[i].UpdateDate;
oldquestionstoarchive.IpAddress = oldQuestions[i].IpAddress;
oldquestionstoarchive.SecurityQuestion = oldQuestions[i].SecurityQuestion;
oldquestionstoarchive.User = oldQuestions[i].User;
oldquestionstoarchivelist.Add(oldquestionstoarchive);
}
I have written a function inside PostgreSQL which has the following code:
for (i = 0; i < 4; i++)
{
Datum dat_value = CStringGetDatum(inp->str[0][i]);
values[i] = datumCopy(dat_value,
stats->attrtype->typbyval,
stats->attrtype->typlen);
}
The input strings are {ALGERIA,ARGENTINA,BRAZIL,CANADA}. The code runs for ALGERIA,ARGENTINA but terminates abruptly for BRAZIL. When I investigated I found that inside datumCopy function, the statement after memcpy is not getting printed. I checked if palloc failed with (s == NULL) condition, but that seems to be not the reason. I think memcpy is failing. Any reason why? Thanks!
Datum
datumCopy(Datum value, bool typByVal, int typLen)
{
Datum res;
if (typByVal)
res = value;
else
{
Size realSize;
char *s;
if (DatumGetPointer(value) == NULL)
return PointerGetDatum(NULL);
realSize = datumGetSize(value, typByVal, typLen);
s = (char *) palloc(realSize);
printf ("Value : %s\n",DatumGetPointer(value));
memcpy(s, DatumGetPointer(value), realSize);
printf ("Not printing \n");
res = PointerGetDatum(s);
}
return res;
}
EDITED : Ok this is really wierd. When the input is one of {BRAZIL,PAKISTAN,FRANCE}, the code terminates abruptly. If I have other countries (I haven't tried extensively, but some countries), the code runs correctly.
EDITED 2 : Found the cause and rectified the issue. If we are passing C strings to datumCopy, we have to pass -2 for typLen parameter. I had been passing it incorrectly.
Thanks!
I have found the cause and rectified the issue.
If we are passing C strings to datumCopy, we have to pass -2 for typLen parameter. I had been passing it incorrectly.
I've been reading up on and experimenting with atomic memory access for synchronization, mainly for educational purposes. Specifically, I'm looking at Mac OS X's OSAtomic* family of functions. Here's what I don't understand: Why is there no way to atomically set a variable instead of modifying it (adding, incrementing, etc.)? OSAtomicCompareAndSwap* is as close as it gets -- but only the swap is atomic, not the whole function itself. This leads to code such as the following not working:
const int N = 100000;
void* threadFunc(void *data) {
int *num = (int *)data;
// Wait for main thread to start us so all spawned threads start
// at the same time.
while (0 == num) { }
for (int i = 0; i < N; ++i) {
OSAtomicCompareAndSwapInt(*num, *num+1, num);
}
}
// called from main thread
void test() {
int num = 0;
pthread_t threads[5];
for (int i = 0; i < 5; ++i) {
pthread_create(&threads[i], NULL, threadFunc, &num);
}
num = 1;
for (int i = 0; i < 5; ++i) {
pthread_join(threads[i], NULL);
}
printf("final value: %d\n", num);
}
When run, this example would ideally produce 500,001 as the final value. However, it doesn't; even when the comparison in OSAtomicCompareAndSwapInt in thread X succeeds, another thread Y can come in set the variable first before X has a chance to change it.
I am aware that in this trivial example I could (and should!) simply use OSAtomicAdd32, in which case the code works. But, what if, for example, I wanted to set a pointer atomically so it points to a new object that another thread can then work with?
I've looked at other APIs, and they seem to be missing this feature as well, which leads me to believe that there is a good reason for it and my confusion is just based on lack of knowledge. If somebody could enlighten me, I'd appreciate it.
I think that you have to check the OSAtomicCompareAndSwapInt result to guarantee that the int was actually set.
I have a type defined in Types like this "create or replace type numbers_table is table of numbers". I have a procedure that has a parameter of this type (ids_list IN numbers_table).
On calling the procedure with Oracle Client I keep receiving the "..Wrong number or types of arguments ..." error.
I am passing this parameter like this:
OracleParameter param1 = new OracleParameter("ids_list", OracleDbType.Decimal, ParamDirection.Input);
param1.CollectionType = OracleCollectionType.PLSQLAssociativeArray;
param1.ArrayBindSize = new int[collectioncount];
param1.ArrayBindStatus = new OracleParameterStatus[collectioncount];
param1.Size = collectioncount;
for(int i = 0; i < collectioncount; i++)
{
param1[i].ArrayBindSize = 8000;
param1[i].ArrayBindStatus = new OracleParameterStatus.Success;
}
param1.Value = collection;
Still no luck ... I have tried to change OracleDbType.Decimal to Double, Long, Int64 etc but nothing works for me.