[CBRD-24980] Fix wasNull () in ServerSideResultSet of server-side JDBC (#4651)

src/jsp/com/cubrid/jsp/impl/SUResultTuple.java

@@ -3,27 +3,39 @@
 import com.cubrid.jsp.data.CUBRIDUnpacker;
 import com.cubrid.jsp.data.SOID;
 import com.cubrid.jsp.exception.TypeMismatchException;
+import com.cubrid.jsp.value.NullValue;
 import com.cubrid.jsp.value.Value;
 
 public class SUResultTuple {
     private int index;
     private SOID oid;
+
     private Object attributes[];
+    private boolean wasNull[] = null;
 
     public SUResultTuple(int tupleIndex, int attributeNumber) {
         index = tupleIndex;
         attributes = new Object[attributeNumber];
+        wasNull = new boolean[attributeNumber];
     }
 
     public SUResultTuple(CUBRIDUnpacker unpacker) throws TypeMismatchException {
         index = unpacker.unpackInt();
         int attributeLength = unpacker.unpackInt();
 
         attributes = new Object[attributeLength];
+        wasNull = new boolean[attributeLength];
+
         for (int i = 0; i < attributeLength; i++) {
             int paramType = unpacker.unpackInt();
             Value v = unpacker.unpackValue(paramType);
             attributes[i] = v;
+
+            if (v instanceof NullValue) {
+                wasNull[i] = true;
+            } else {
+                wasNull[i] = false;
+            }
         }
 
         oid = unpacker.unpackOID();
@@ -38,10 +50,10 @@ public void close() {
     }
 
     public Object getAttribute(int tIndex) {
-        /*
-         * if (tIndex < 0 || attributes == null || tIndex >= attributes.length)
-         * return null;
-         */
+        if (tIndex < 0 || attributes == null || tIndex >= attributes.length) {
+            return null;
+        }
+
         return attributes[tIndex];
     }
 
@@ -62,6 +74,12 @@ public void setAttribute(int tIndex, Object data) {
          */
 
         attributes[tIndex] = data;
+
+        if (data instanceof NullValue) {
+            wasNull[tIndex] = true;
+        } else {
+            wasNull[tIndex] = false;
+        }
     }
 
     public void setOID(SOID o) {
@@ -71,4 +89,8 @@ public void setOID(SOID o) {
     public int tupleNumber() {
         return index;
     }
+
+    public boolean getWasNull(int tIndex) {
+        return wasNull[tIndex];
+    }
 }

src/jsp/com/cubrid/jsp/impl/SUStatement.java

@@ -428,17 +428,22 @@ private Object beforeGetTuple(int index) throws SQLException {
             // GET_BY_OID initialized 1 tuple at constructor
         }
 
-        Object obj;
+        SUResultTuple tuple = null;
+        Object obj = null;
 
-        if ((tuples == null)
-                || (tuples[cursorPosition - fetchedStartCursorPosition] == null)
-                || ((obj = tuples[cursorPosition - fetchedStartCursorPosition].getAttribute(index))
-                        == null)) {
+        if ((tuples == null) || (tuples[cursorPosition - fetchedStartCursorPosition] == null)) {
+            return null;
+        }
+
+        tuple = tuples[cursorPosition - fetchedStartCursorPosition];
+        if (tuple.getAttribute(index) == null) {
+            // it is error case... but for safe guard
             wasNull = true;
             return null;
         }
-        wasNull = false;
 
+        obj = tuple.getAttribute(index);
+        wasNull = tuple.getWasNull(index);
         return obj;
     }
 

src/jsp/com/cubrid/jsp/jdbc/CUBRIDServerSideResultSet.java

@@ -77,8 +77,6 @@ public class CUBRIDServerSideResultSet implements ResultSet {
     /* For findColumn */
     protected HashMap<String, Integer> colNameToIdx;
 
-    private boolean wasNullValue = false;
-
     private boolean isInserting;
     private int currentRowIndex = -1;
 
@@ -234,7 +232,7 @@ public void close() throws SQLException {
 
     @Override
     public boolean wasNull() throws SQLException {
-        return wasNullValue;
+        return statementHandler.getWasNull();
     }
 
     @Override