Re: MonetDB: embedded-java - Fix miltiple column type cast

21 Oct 2015

On 21/10/15 15:32, Dimitar Nedev wrote:
...
I *need* to map it to a (primitive) type in Java. I can keep creating my own types but nobody's gonna know what to do with them. The expected behaviour should be the same as with JDBC.
Be that as it may, you can still not use long.  If the C type that you
get from Java really is long, you need to use C preprocessor
conditionals to distinguish between int (4 bytes) and lng (8 bytes).
You can not cast the result of Tloc() to (long *).  Period.
You can depend on float being equal to flt, and double being equal to dbl.
You have to make some sort of mapping between the native Java types and
the MonetDB types.  But that does not involve long on the MonetDB side
of things.
...
Best,
Dimitar
...
On 2015-Oct-21, at 15:27, Sjoerd Mullender sjoerd@acm.org wrote:
Columns do not contain values of type short, long, float or double.
They might contain values of type sht, lng, flt and dbl.  You should not
use type long in your code unless an external API requires it.  Long is
not portable since it can be either 32 or 64 bits, even on a 64 bit
architecture.
A good rule is, if you created a BAT with a TYPE_xxx, use xxx as the
name of the C type.
On 21/10/15 14:55, Dimitar Nedev wrote:
...
Changeset: bf487cfa489a for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=bf487cfa489a
Modified Files:
   java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c
Branch: embedded-java
Log Message:
Fix miltiple column type cast
diffs (90 lines):

diff --git a/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c b/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c
--- a/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c
+++ b/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c
@@ -29,18 +29,18 @@ static jobject getBooleanColumn(JNIEnv *
   jboolean nul_tmp[size];
   if (b->T->nonil && !b->T->nil) {
   	for (i = 0; i < size; i++) {

	val_tmp[i] = (jboolean) ((jboolean*) Tloc(b, BUNfirst(b)))[i];




	val_tmp[i] = (bit) ((bit*) Tloc(b, BUNfirst(b)))[i];
nul_tmp[i] = false;

}
}
else {
for (i = 0; i < size; i++) {


	int v = ((jboolean*) Tloc(b, BUNfirst(b)))[i];




	int v = ((bit*) Tloc(b, BUNfirst(b)))[i];
if (v == bit_nil) {
	val_tmp[i] = 0;
	nul_tmp[i] = true;
} else {




		val_tmp[i] = (jboolean)v;




		val_tmp[i] = (bit)v;
	nul_tmp[i] = false;
}

}

@@ -78,7 +78,7 @@ static jobject getByteColumn(JNIEnv *env
   }
   else {
   	for (i = 0; i < size; i++) {

	int v = ((bte*) Tloc(b, BUNfirst(b)))[i];




	bte v = ((bte*) Tloc(b, BUNfirst(b)))[i];
if (v == bte_nil) {
	val_tmp[i] = 0;
	nul_tmp[i] = true;



@@ -121,7 +121,7 @@ static jobject getShortColumn(JNIEnv *en
   }
   else {
   	for (i = 0; i < size; i++) {

	int v = ((short*) Tloc(b, BUNfirst(b)))[i];




	short v = ((short*) Tloc(b, BUNfirst(b)))[i];
if (v == sht_nil) {
	val_tmp[i] = 0;
	nul_tmp[i] = true;



@@ -207,7 +207,7 @@ static jobject getLongColumn(JNIEnv *env
   }
   else {
   	for (i = 0; i < size; i++) {

	int v = ((long*) Tloc(b, BUNfirst(b)))[i];




	long v = ((long*) Tloc(b, BUNfirst(b)))[i];
if (v == lng_nil) {
	val_tmp[i] = 0;
	nul_tmp[i] = true;



@@ -250,7 +250,7 @@ static jobject getFloatColumn(JNIEnv *en
   }
   else {
   	for (i = 0; i < size; i++) {

	int v = ((float*) Tloc(b, BUNfirst(b)))[i];




	float v = ((float*) Tloc(b, BUNfirst(b)))[i];
if (v == flt_nil) {
	val_tmp[i] = 0.0;
	nul_tmp[i] = true;



@@ -293,7 +293,7 @@ static jobject getDoubleColumn(JNIEnv *e
   }
   else {
   	for (i = 0; i < size; i++) {

	int v = ((double*) Tloc(b, BUNfirst(b)))[i];




	double v = ((double*) Tloc(b, BUNfirst(b)))[i];
if (v == dbl_nil) {
	val_tmp[i] = 0.0;
	nul_tmp[i] = true;



@@ -346,7 +346,6 @@ static jobject getStringColumn(JNIEnv *e
   		j++;
   	}
   }

// Create the column object
 // from Java StringColumn(String[] values, int columnSize, boolean[] nullIndex)
 column = (*env)->NewObject(env, columnClass, columnConstructor, values, size, nulls);

@@ -380,11 +379,9 @@ JNIEXPORT jobject JNICALL Java_org_monet
   	return getLongColumn(env, b);
   	break;
   case TYPE_flt:

printf("float1\n");

return getFloatColumn(env, b);
break;
case TYPE_dbl:
printf("double1\n");

return getDoubleColumn(env, b);
break;
case TYPE_str:


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--
Sjoerd Mullender

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