From ace482e293c8c0ddccd52fcc878cca6dd8209071 Mon Sep 17 00:00:00 2001
From: dapan1121 <89396746@qq.com>
Date: Tue, 11 May 2021 18:59:51 +0800
Subject: [PATCH] fix bug

---
 .../java/com/taosdata/jdbc/TSDBPreparedStatement.java  | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

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 b7e2a9abd3..71e07252a3 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
@@ -60,10 +60,12 @@ public class TSDBPreparedStatement extends TSDBStatement implements PreparedStat
             parameters = new Object[parameterCnt];
             this.isPrepared = true;
         }
-        
-        // the table name is also a parameter, so ignore it.
-        this.colData = new ArrayList<ColumnInfo>(parameterCnt - 1);
-        this.colData.addAll(Collections.nCopies(parameterCnt - 1, null));
+
+		if (parameterCnt > 1) {
+	        // the table name is also a parameter, so ignore it.
+	        this.colData = new ArrayList<ColumnInfo>(parameterCnt - 1);
+	        this.colData.addAll(Collections.nCopies(parameterCnt - 1, null));
+		}
     }
 
     private void init(String sql) {