Fix Statement.getUpdateCount() to return -1 when current result is a ResultSet (#54)

Author: IceboxDev

com.dbeaver.jdbc.driver.libsql/src/main/java/com/dbeaver/jdbc/driver/libsql/LibSqlStatement.java

@@ -121,21 +121,29 @@ public ResultSet getResultSet() throws SQLException {
     @Override
     public int getUpdateCount() throws SQLException {
         if (executionResult == null) {
-            throw new LibSqlException("No update count before statement execute");
+            return -1;
+        }
+        if (executionResult.getColumns() != null && !executionResult.getColumns().isEmpty()) {
+            return -1;
         }
         return (int) executionResult.getUpdateCount();
     }
 
     @Override
     public long getLargeUpdateCount() throws SQLException {
         if (executionResult == null) {
-            throw new LibSqlException("No update count before statement execute");
+            return -1;
+        }
+        if (executionResult.getColumns() != null && !executionResult.getColumns().isEmpty()) {
+            return -1;
         }
         return executionResult.getUpdateCount();
     }
 
     @Override
     public boolean getMoreResults() throws SQLException {
+        executionResult = null;
+        resultSet = null;
         return false;
     }
 
@@ -151,6 +159,8 @@ public int getFetchDirection() throws SQLException {
 
     @Override
     public boolean getMoreResults(int current) throws SQLException {
+        executionResult = null;
+        resultSet = null;
         return false;
     }
     @Override