diff --git a/.gitignore b/.gitignore
index da47590a2fac52879c470e3c6b89dffaa57d775a..50f4251320abc80358b67eab22c02672d5f26bd6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -68,6 +68,8 @@ CMakeError.log
 *.o
 version.c
 taos.rc
+src/connector/jdbc/.classpath
+src/connector/jdbc/.project
 src/connector/jdbc/.settings/
 tests/comparisonTest/cassandra/cassandratest/.classpath
 tests/comparisonTest/cassandra/cassandratest/.project
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java
index d9042fb729d9d746e16bded46e780a83913f778b..22fb0c4ae4987ade0a406fe5628bf80d975f3ae5 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/TSDBPreparedStatement.java
@@ -57,8 +57,8 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
                     parameterCnt++;
                 }
             }
-            parameters = new Object[parameterCnt];
         }
+        parameters = new Object[parameterCnt];
 
         if (parameterCnt > 1) {
             // the table name is also a parameter, so ignore it.
diff --git a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java
index 1eaddce1d636f5c74c1226f0df0e66e322600345..f2abbd24454ff13f708636b61bcf93be2e0d47b5 100644
--- a/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java
+++ b/src/connector/jdbc/src/main/java/com/taosdata/jdbc/rs/RestfulPreparedStatement.java
@@ -22,16 +22,16 @@ public class RestfulPreparedStatement extends RestfulStatement implements Prepar
         super(conn, database);
         this.rawSql = sql;
 
+        int parameterCnt = 0;
         if (sql.contains("?")) {
-            int parameterCnt = 0;
             for (int i = 0; i < sql.length(); i++) {
                 if ('?' == sql.charAt(i)) {
                     parameterCnt++;
                 }
             }
-            parameters = new Object[parameterCnt];
             this.isPrepared = true;
         }
+        parameters = new Object[parameterCnt];
 
         // build parameterMetaData
         this.parameterMetaData = new RestfulParameterMetaData(parameters);
diff --git a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
index 244e8afd117868432638c771b21048fae3b1367c..4760a723e4b4e662326987290c2c630803f8f470 100644
--- a/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
+++ b/src/connector/jdbc/src/test/java/com/taosdata/jdbc/rs/RestfulPreparedStatementTest.java
@@ -15,6 +15,8 @@ public class RestfulPreparedStatementTest {
     private static PreparedStatement pstmt_insert;
     private static final String sql_select = "select * from t1 where ts > ? and ts <= ? and f1 >= ?";
     private static PreparedStatement pstmt_select;
+    private static final String sql_without_parameters = "select count(*) from t1";
+    private static PreparedStatement pstmt_without_parameters;
 
     @Test
     public void executeQuery() throws SQLException {
@@ -237,6 +239,7 @@ public class RestfulPreparedStatementTest {
     @Test
     public void clearParameters() throws SQLException {
         pstmt_insert.clearParameters();
+        pstmt_without_parameters.clearParameters();
     }
 
     @Test
@@ -382,6 +385,7 @@ public class RestfulPreparedStatementTest {
 
             pstmt_insert = conn.prepareStatement(sql_insert);
             pstmt_select = conn.prepareStatement(sql_select);
+            pstmt_without_parameters = conn.prepareStatement(sql_without_parameters);
         } catch (SQLException e) {
             e.printStackTrace();
         }
@@ -394,6 +398,8 @@ public class RestfulPreparedStatementTest {
                 pstmt_insert.close();
             if (pstmt_select != null)
                 pstmt_select.close();
+            if (pstmt_without_parameters != null)
+                pstmt_without_parameters.close();
             if (conn != null)
                 conn.close();
         } catch (SQLException e) {