Merge pull request #651 from xieyinglin/master

print the java.library.path variable for debug

src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBJNIConnector.java

@@ -23,6 +23,7 @@ public class TSDBJNIConnector {
 
     static {
         System.loadLibrary("taos");
+        System.out.println("java.library.path:" + System.getProperty("java.library.path"));
     }
 
     /**
@@ -50,6 +51,7 @@ public class TSDBJNIConnector {
 
     /**
      * Returns the status of last result set in current connection
+     *
      * @return
      */
     public boolean isResultsetClosed() {
@@ -60,7 +62,7 @@ public class TSDBJNIConnector {
      * Initialize static variables in JNI to optimize performance
      */
     public static void init(String configDir, String locale, String charset, String timezone) throws SQLWarning {
-		synchronized(isInitialized) {
+        synchronized (isInitialized) {
             if (!isInitialized) {
                 initImp(configDir);
                 if (setOptions(0, locale) < 0) {
@@ -179,7 +181,7 @@ public class TSDBJNIConnector {
         int res = TSDBConstants.JNI_SUCCESS;
         if (result != taosResultSetPointer && taosResultSetPointer != TSDBConstants.JNI_NULL_POINTER) {
             throw new RuntimeException("Invalid result set pointer");
-        } else if (taosResultSetPointer != TSDBConstants.JNI_NULL_POINTER){
+        } else if (taosResultSetPointer != TSDBConstants.JNI_NULL_POINTER) {
             res = this.freeResultSetImp(this.taos, result);
             isResultsetClosed = true; // reset resultSetPointer to 0 after freeResultSetImp() return
             taosResultSetPointer = TSDBConstants.JNI_NULL_POINTER;
@@ -192,6 +194,7 @@ public class TSDBJNIConnector {
     /**
      * Close the open result set which is associated to the current connection. If the result set is already
      * closed, return 0 for success.
+     *
      * @return
      */
     public int freeResultSet() {
@@ -246,7 +249,7 @@ public class TSDBJNIConnector {
         int code = this.closeConnectionImp(this.taos);
         if (code < 0) {
             throw new SQLException(TSDBConstants.FixErrMsg(code), "", this.getErrCode());
-		} else if (code == 0){
+        } else if (code == 0) {
             this.taos = TSDBConstants.JNI_NULL_POINTER;
         } else {
             throw new SQLException("Undefined error code returned by TDengine when closing a connection");
@@ -258,7 +261,7 @@ public class TSDBJNIConnector {
     /**
      * Subscribe to a table in TSDB
      */
-	public long subscribe(String host, String user, String password, String database, String table, long time, int period){
+    public long subscribe(String host, String user, String password, String database, String table, long time, int period) {
         return subscribeImp(host, user, password, database, table, time, period);
     }
 
@@ -275,6 +278,7 @@ public class TSDBJNIConnector {
 
     /**
      * Unsubscribe a table
+     *
      * @param subscription
      */
     public void unsubscribe(long subscription) {